VW Golf Mk4 1.8T 20v (AUM, Bosch ME7.5) DBW → AMP EFI MS3Pro Ultimate (auto)
VW Golf Mk4 1.8T 20v (AUM, Bosch ME7.5) DBW — AMP EFI — MS3Pro Ultimate
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-23
Before you start
Not confident with automotive wiring? Have a professional harness builder or tuner do it, or check your work before first power-up. A wiring mistake can damage the ECU, the engine or the car, or start a fire.
| Status | proposal · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | none |
| Size of the job | 88 wires · 8 connectors · 0 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| Order of work | 1. Check every part against the parts list. 2. Cut and label every wire (labels: Export → Wire labels). 3. Crimp and pin connector by connector, ticking the build checklist. 4. Run the bench test with nothing plugged in and the battery disconnected. 5. Only then connect the ECU and power up. |
Build checklist
Tick each box as you go. Continuity: meter from end to end, expect under 1 Ω.
| Wire | From | To | Gauge | Colour | Cut | Label | Crimp A | Crimp B | Pin A | Pin B | Continuity |
|---|---|---|---|---|---|---|---|---|---|---|---|
| W1 | OEM-T121-121 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | OEM-T121-21 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | SP-14V-1 | MS3PROULTIMA-A-35 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-T121-62 | MS3PROULTIMA-C-23 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-T121-1 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-T121-2 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | MS3PROULTIMA-A-13 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | MS3PROULTIMA-B-18 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | MS3PROULTIMA-B-3 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | MS3PROULTIMA-B-5 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | MS3PROULTIMA-B-7 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | SP-GND-1 | MS3PROULTIMA-B-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-T121-108 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-T121-29 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-T121-34 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-T121-36 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-T121-90 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-T121-91 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | SP-0V-1 | MS3PROULTIMA-A-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | SP-0V-1 | MS3PROULTIMA-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | SP-0V-1 | MS3PROULTIMA-C-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | SP-0V-1 | MS3PROULTIMA-C-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | SP-0V-1 | MS3PROULTIMA-C-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | SP-0V-1 | MS3PROULTIMA-C-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | SP-0V-1 | MS3PROULTIMA-C-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-T121-72 | MS3PROULTIMA-A-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-T121-73 | MS3PROULTIMA-C-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-T121-83 | MS3PROULTIMA-C-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-T121-98 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-T121-99 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | SP-5V1-1 | MS3PROULTIMA-C-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-T121-82 | MS3PROULTIMA-A-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | SP-0V-1 | MS3PROULTIMA-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-T121-86 | MS3PROULTIMA-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | SP-0V-1 | MS3PROULTIMA-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-T121-106 | MS3PROULTIMA-A-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-T121-107 | MS3PROULTIMA-A-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-T121-102 | MS3PROULTIMA-B-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-T121-95 | MS3PROULTIMA-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-T121-103 | MS3PROULTIMA-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-T121-94 | MS3PROULTIMA-B-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-T121-96 | MS3PROULTIMA-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-T121-89 | MS3PROULTIMA-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-T121-97 | MS3PROULTIMA-B-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-T121-88 | MS3PROULTIMA-B-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-T121-118 | MS3PROULTIMA-B-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-T121-117 | MS3PROULTIMA-B-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-T121-3 | MS3PROULTIMA-B-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-T121-53 | MS3PROULTIMA-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-T121-101 | MS3PROULTIMA-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-T121-33 | MS3PROULTIMA-A-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | OEM-T121-84 | MS3PROULTIMA-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | OEM-T121-35 | MS3PROULTIMA-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | OEM-T121-92 | MS3PROULTIMA-A-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W55 | OEM-T121-93 | MS3PROULTIMA-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W56 | OEM-T121-65 | MS3PROULTIMA-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W57 | OEM-T121-66 | MS3PROULTIMA-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W58 | OEM-T121-5 | MS3PROULTIMA-C-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W59 | OEM-T121-63 | MS3PROULTIMA-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W60 | OEM-T121-25 | MS3PROULTIMA-C-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W61 | OEM-T121-80 | MS3PROULTIMA-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W62 | OEM-T121-104 | MS3PROULTIMA-C-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W63 | OEM-T121-105 | MS3PROULTIMA-C-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W64 | OEM-T121-115 | MS3PROULTIMA-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W65 | OEM-T121-22 | MS3PROULTIMA-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W66 | OEM-T121-47 | MS3PROULTIMA-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W67 | OEM-T121-48 | MS3PROULTIMA-B-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W68 | OEM-T121-64 | MS3PROULTIMA-B-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W69 | OEM-T121-9 | MS3PROULTIMA-B-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W70 | OEM-T121-37 | MS3PROULTIMA-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W71 | OEM-T121-68 | MS3PROULTIMA-A-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W72 | OEM-T121-69 | MS3PROULTIMA-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W73 | OEM-T121-85 | MS3PROULTIMA-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W74 | OEM-T121-54 | MS3PROULTIMA-B-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W75 | OEM-T121-28 | MS3PROULTIMA-A-32 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W76 | OEM-T121-38 | MS3PROULTIMA-B-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W77 | OEM-T121-39 | MS3PROULTIMA-B-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W78 | OEM-T121-40 | MS3PROULTIMA-C-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W79 | OEM-T121-41 | MS3PROULTIMA-C-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W80 | OEM-T121-49 | MS3PROULTIMA-B-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W81 | OEM-T121-55 | MS3PROULTIMA-B-35 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W82 | OEM-T121-56 | MS3PROULTIMA-B-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W83 | OEM-T121-57 | MS3PROULTIMA-B-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W84 | OEM-T121-67 | MS3PROULTIMA-B-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W85 | OEM-T121-75 | MS3PROULTIMA-B-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W86 | OEM-T121-76 | MS3PROULTIMA-A-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W87 | OEM-T121-60 | MS3PROULTIMA-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W88 | OEM-T121-58 | MS3PROULTIMA-A-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ |
Bench test (before first power-up)
Battery disconnected, ECU and every sensor unplugged. Meter on resistance. Each pair below must read open (OL): a reading means a pinched wire, a stray strand or a mis-pinned cavity. Then check continuity of every wire (last column of the build checklist).
| # | Probe A | Probe B | Expect | Why | Reading |
|---|---|---|---|---|---|
| 1 | MS3PROULTIMA-A-13 | MS3PROULTIMA-A-35 | open (OL) | power ground must not touch +12 V supply | |
| 2 | MS3PROULTIMA-A-13 | MS3PROULTIMA-A-8 | open (OL) | power ground must not touch 5 V sensor reference | |
| 3 | MS3PROULTIMA-A-13 | MS3PROULTIMA-C-15 | open (OL) | power ground must not touch 5 V sensor reference | |
| 4 | MS3PROULTIMA-A-13 | MS3PROULTIMA-C-22 | open (OL) | power ground must not touch 5 V sensor reference | |
| 5 | MS3PROULTIMA-A-13 | MS3PROULTIMA-C-23 | open (OL) | power ground must not touch +12 V supply | |
| 6 | MS3PROULTIMA-A-13 | MS3PROULTIMA-C-8 | open (OL) | power ground must not touch 5 V sensor reference | |
| 7 | MS3PROULTIMA-A-15 | MS3PROULTIMA-A-35 | open (OL) | sensor ground must not touch +12 V supply | |
| 8 | MS3PROULTIMA-A-15 | MS3PROULTIMA-A-8 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 9 | MS3PROULTIMA-A-15 | MS3PROULTIMA-C-15 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 10 | MS3PROULTIMA-A-15 | MS3PROULTIMA-C-22 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 11 | MS3PROULTIMA-A-15 | MS3PROULTIMA-C-23 | open (OL) | sensor ground must not touch +12 V supply | |
| 12 | MS3PROULTIMA-A-15 | MS3PROULTIMA-C-8 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 13 | MS3PROULTIMA-A-35 | MS3PROULTIMA-A-8 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 14 | MS3PROULTIMA-A-35 | MS3PROULTIMA-C-15 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 15 | MS3PROULTIMA-A-35 | MS3PROULTIMA-C-22 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 16 | MS3PROULTIMA-A-35 | MS3PROULTIMA-C-8 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 17 | MS3PROULTIMA-C-23 | MS3PROULTIMA-A-8 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 18 | MS3PROULTIMA-C-23 | MS3PROULTIMA-C-15 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 19 | MS3PROULTIMA-C-23 | MS3PROULTIMA-C-22 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 20 | MS3PROULTIMA-C-23 | MS3PROULTIMA-C-8 | open (OL) | +12 V supply must not touch 5 V sensor reference |
If any reading doesn't match, stop and get help before powering up.
Revisions
| Rev | Label | By | Date |
|---|---|---|---|
| No revisions yet. | |||
Schematic
Connectors
MS3PROULTIMA-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | High current out 1 | — | W64 | — | 0.5 | OEM-T121-115 | — | — | — |
| 10 | MAT in | — | W73 | — | 0.5 | OEM-T121-85 | — | — | — |
| 11 | CLT in | — | W55 | — | 0.5 | OEM-T121-93 | — | — | — |
| 12 | Analog In 6 | — | W72 | — | 0.5 | OEM-T121-69 | — | — | — |
| 13 | Power ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 14 | PWM / Idle Out 1 | — | W57 | — | 0.5 | OEM-T121-66 | — | — | — |
| 15 | CKP− | — | W33 | — | 0.5 | SP-0V-1 | — | — | — |
| 16 | Logic ground | — | W19 | — | 0.5 | SP-0V-1 | — | — | — |
| 17 | Analog In 7 | — | W86 | — | 0.5 | OEM-T121-76 | — | — | — |
| 18 | Sensor return | — | W20 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Analog in 1 | — | W49 | — | 0.5 | OEM-T121-53 | — | — | — |
| 2 | High current out 2 | — | W65 | — | 0.5 | OEM-T121-22 | — | — | — |
| 20 | Analog in 2 | — | W50 | — | 0.5 | OEM-T121-101 | — | — | — |
| 21 | Analog in 3 | — | W52 | — | 0.5 | OEM-T121-84 | — | — | — |
| 22 | Analog In 4 | — | W53 | — | 0.5 | OEM-T121-35 | — | — | — |
| 23 | Analog In 5 | — | W54 | — | 0.5 | OEM-T121-92 | — | — | — |
| 24 | Tach out | — | W70 | — | 0.5 | OEM-T121-37 | — | — | — |
| 25 | O2 in | — | W71 | — | 0.5 | OEM-T121-68 | — | — | — |
| 26 | CMP+ | — | W34 | — | 0.5 | OEM-T121-86 | — | — | — |
| 27 | CMP− | — | W35 | — | 0.5 | SP-0V-1 | — | — | — |
| 28 | Fuel pump relay out | — | W56 | — | 0.5 | OEM-T121-65 | — | — | — |
| 29 | PWM out 2 | — | W59 | — | 0.5 | OEM-T121-63 | — | — | — |
| 3 | Injector out J | — | W42 | — | 0.5 | OEM-T121-96 | — | — | — |
| 30 | PWM out 3 | — | W61 | — | 0.5 | OEM-T121-80 | — | — | — |
| 31 | Knock in 1 | — | W36 | — | 0.5 | OEM-T121-106 | — | — | — |
| 32 | Digital switched in 1 | — | W75 | — | 0.5 | OEM-T121-28 | — | — | — |
| 33 | CAN L | — | W88 | — | 0.5 | OEM-T121-58 | — | — | — |
| 34 | CAN H | — | W87 | — | 0.5 | OEM-T121-60 | — | — | — |
| 35 | 12V+ switched power in | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 4 | Injector out I | — | W43 | — | 0.5 | OEM-T121-89 | — | — | — |
| 5 | High current out 3 | — | W66 | — | 0.5 | OEM-T121-47 | — | — | — |
| 6 | CKP+ | — | W32 | — | 0.5 | OEM-T121-82 | — | — | — |
| 7 | Knock In 2 | — | W37 | — | 0.5 | OEM-T121-107 | — | — | — |
| 8 | 5V+ VREF out 1 | — | W26 | — | 0.5 | OEM-T121-72 | — | — | — |
| 9 | TPS in | — | W51 | — | 0.5 | OEM-T121-33 | — | — | — |
MS3PROULTIMA-B
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector out A | — | W44 | — | 0.5 | OEM-T121-97 | — | — | — |
| 10 | Injector out F | — | W45 | — | 0.5 | OEM-T121-88 | — | — | — |
| 11 | Injector out G | — | W67 | — | 0.5 | OEM-T121-48 | — | — | — |
| 12 | Injector out H | — | W68 | — | 0.5 | OEM-T121-64 | — | — | — |
| 13 | Spark out G | — | W38 | — | 0.5 | OEM-T121-102 | — | — | — |
| 14 | Spark out E | — | W39 | — | 0.5 | OEM-T121-95 | — | — | — |
| 15 | Spark out C | — | W40 | — | 0.5 | OEM-T121-103 | — | — | — |
| 16 | Spark out H | — | W41 | — | 0.5 | OEM-T121-94 | — | — | — |
| 17 | Digital frequency in 2 | — | W82 | — | 0.5 | OEM-T121-56 | — | — | — |
| 18 | Ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 19 | Digital switched 12V in | — | W48 | — | 0.5 | OEM-T121-3 | — | — | — |
| 2 | Injector out B | — | W69 | — | 0.5 | OEM-T121-9 | — | — | — |
| 20 | Digital switched in 2 | — | W76 | — | 0.5 | OEM-T121-38 | — | — | — |
| 21 | Digital frequency in 3 | — | W83 | — | 0.5 | OEM-T121-57 | — | — | — |
| 22 | Digital Frequency in 3 VR+ | — | W84 | — | 0.5 | OEM-T121-67 | — | — | — |
| 23 | Digital Frequency In 3 VR− | — | W85 | — | 0.5 | OEM-T121-75 | — | — | — |
| 24 | Spark out F | — | — | — | — | — | — | — | — |
| 25 | Spark out B | — | — | — | — | — | — | — | — |
| 26 | Spark out D | — | — | — | — | — | — | — | — |
| 27 | Spark out A | — | — | — | — | — | — | — | — |
| 28 | Digital frequency in 1 | — | W74 | — | 0.5 | OEM-T121-54 | — | — | — |
| 29 | Digital switched in 3 | — | W77 | — | 0.5 | OEM-T121-39 | — | — | — |
| 3 | Ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 30 | Stepper IAC out 1B | — | W47 | — | 0.5 | OEM-T121-117 | — | — | — |
| 31 | Stepper IAC out 1A | — | W46 | — | 0.5 | OEM-T121-118 | — | — | — |
| 32 | Stepper IAC out 2A | — | — | — | — | — | — | — | — |
| 33 | Stepper IAC out 2B | — | — | — | — | — | — | — | — |
| 34 | Digital Frequency in 1 VR+ | — | W80 | — | 0.5 | OEM-T121-49 | — | — | — |
| 35 | Digital Frequency in 1 VR− | — | W81 | — | 0.5 | OEM-T121-55 | — | — | — |
| 4 | Injector out C | — | — | — | — | — | — | — | — |
| 5 | Ground | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
| 6 | Injector out D | — | — | — | — | — | — | — | — |
| 7 | Ground | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| 8 | Injector out E | — | — | — | — | — | — | — | — |
| 9 | Ground | — | W12 | — | 0.85 | SP-GND-1 | — | — | — |
MS3PROULTIMA-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | PWM out 5 | — | W63 | — | 0.5 | OEM-T121-105 | — | — | — |
| 10 | Digital switched in 5 | — | W79 | — | 0.5 | OEM-T121-41 | — | — | — |
| 11 | Digital switched in 4 | — | W78 | — | 0.5 | OEM-T121-40 | — | — | — |
| 12 | Digital I/O 5 | — | — | — | — | — | — | — | — |
| 13 | Digital I/O 3 | — | — | — | — | — | — | — | — |
| 14 | Digital I/O 1 | — | — | — | — | — | — | — | — |
| 15 | 5V+ VREF out 2 | — | W27 | — | 0.5 | OEM-T121-73 | — | — | — |
| 16 | Fuel only battery 12V+ | — | — | — | — | — | — | — | — |
| 17 | Sensor return | — | W21 | — | 0.5 | SP-0V-1 | — | — | — |
| 18 | Sensor return | — | W22 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Sensor return | — | W23 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | PWM out 4 | — | W62 | — | 0.5 | OEM-T121-104 | — | — | — |
| 20 | Sensor return | — | W24 | — | 0.5 | SP-0V-1 | — | — | — |
| 21 | Sensor return | — | W25 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | 5V+ VREF out 1 | — | W28 | — | 0.5 | OEM-T121-83 | — | — | — |
| 23 | Keep alive power | — | W4 | — | 0.85 | OEM-T121-62 | — | — | — |
| 3 | Digital out 2 | — | W60 | — | 0.5 | OEM-T121-25 | — | — | — |
| 4 | Digital out 1 | — | W58 | — | 0.5 | OEM-T121-5 | — | — | — |
| 5 | Digital I/O 4 | — | — | — | — | — | — | — | — |
| 6 | Digital I/O 2 | — | — | — | — | — | — | — | — |
| 7 | Analog in 8 | — | — | — | — | — | — | — | — |
| 8 | 5V+ VREF out 2 | — | W31 | — | 0.5 | SP-5V1-1 | — | — | — |
| 9 | Fuel only coil negative | — | — | — | — | — | — | — | — |
OEM-T121
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ECU ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 101 | Boost pressure sensor (G31) | — | W50 | — | 0.5 | MS3PROULTIMA-A-20 | — | — | — |
| 102 | Ignition coil 1 (N127) | — | W38 | — | 0.5 | MS3PROULTIMA-B-13 | — | — | — |
| 103 | Ignition coil 3 (N158) | — | W40 | — | 0.5 | MS3PROULTIMA-B-15 | — | — | — |
| 104 | Boost control solenoid (N75) | — | W62 | — | 0.5 | MS3PROULTIMA-C-2 | — | — | — |
| 105 | Diverter valve (N249) | — | W63 | — | 0.5 | MS3PROULTIMA-C-1 | — | — | — |
| 106 | Knock sensor 1 (G61) | — | W36 | — | 0.5 | MS3PROULTIMA-A-31 | — | — | — |
| 107 | Knock sensor 2 (G66) | — | W37 | — | 0.5 | MS3PROULTIMA-A-7 | — | — | — |
| 108 | Sensor ground | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 115 | VVT camshaft adjustment valve (N205) | — | W64 | — | 0.5 | MS3PROULTIMA-A-1 | — | — | — |
| 117 | Throttle motor G186 (+) | — | W47 | — | 0.5 | MS3PROULTIMA-B-30 | — | — | — |
| 118 | Throttle motor G186 (−) | — | W46 | — | 0.5 | MS3PROULTIMA-B-31 | — | — | — |
| 121 | ECM + coil power (J271 relay feed) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | ECU ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 21 | ECM power (J271 relay feed) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 22 | Brake vacuum pump (V192) | — | W65 | — | 0.5 | MS3PROULTIMA-A-2 | — | — | — |
| 25 | V144 Evaporative diagnostic pump (Pin 2) | — | W60 | — | 0.5 | MS3PROULTIMA-C-3 | — | — | — |
| 27 | MAF sensor supply (G70) | — | — | — | — | — | — | — | — |
| 28 | Alternator DF terminal (charge warning) | — | W75 | — | 0.5 | MS3PROULTIMA-A-32 | — | — | — |
| 29 | MAF sensor ground (G70) | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | Ignition switch +12V (term 15) | — | W48 | — | 0.5 | MS3PROULTIMA-B-19 | — | — | — |
| 33 | Accelerator pedal position 1 (G79) | — | W51 | — | 0.5 | MS3PROULTIMA-A-9 | — | — | — |
| 34 | Accelerator pedal position 1 ground (G79) | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 35 | Accelerator pedal position 2 (G185) | — | W53 | — | 0.5 | MS3PROULTIMA-A-22 | — | — | — |
| 36 | Accelerator pedal position 2 ground (G185) | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 37 | Engine speed signal (tacho to cluster) | — | W70 | — | 0.5 | MS3PROULTIMA-A-24 | — | — | — |
| 38 | Cruise control switch (E45) | — | W76 | — | 0.5 | MS3PROULTIMA-B-20 | — | — | — |
| 39 | Clutch pedal switch (F36) | — | W77 | — | 0.5 | MS3PROULTIMA-B-29 | — | — | — |
| 40 | A/C signal | — | W78 | — | 0.5 | MS3PROULTIMA-C-11 | — | — | — |
| 41 | A/C signal | — | W79 | — | 0.5 | MS3PROULTIMA-C-10 | — | — | — |
| 43 | K-line diagnostics (OBD pin 7) | — | — | — | — | — | — | — | — |
| 47 | Check engine light (MIL) | — | W66 | — | 0.5 | MS3PROULTIMA-A-5 | — | — | — |
| 48 | EPC warning light | — | W67 | — | 0.5 | MS3PROULTIMA-B-11 | — | — | — |
| 49 | Power steering pressure switch (F88) | — | W80 | — | 0.5 | MS3PROULTIMA-B-34 | — | — | — |
| 5 | Wideband lambda heater (Z19) | — | W58 | — | 0.5 | MS3PROULTIMA-C-4 | — | — | — |
| 50 | Power steering pressure switch supply (F88) | — | — | — | — | — | — | — | — |
| 51 | Wideband lambda pump (G39) | — | — | — | — | — | — | — | — |
| 52 | Wideband lambda pump (G39) | — | — | — | — | — | — | — | — |
| 53 | MAF sensor signal (G70) | — | W49 | — | 0.5 | MS3PROULTIMA-A-19 | — | — | — |
| 54 | Road speed signal (VSS) | — | W74 | — | 0.5 | MS3PROULTIMA-B-28 | — | — | — |
| 55 | Brake pedal switch (F) | — | W81 | — | 0.5 | MS3PROULTIMA-B-35 | — | — | — |
| 56 | Brake pedal switch (F) | — | W82 | — | 0.5 | MS3PROULTIMA-B-17 | — | — | — |
| 57 | Cruise control switch (E45) | — | W83 | — | 0.5 | MS3PROULTIMA-B-21 | — | — | — |
| 58 | CAN bus low | — | W88 | — | 0.5 | MS3PROULTIMA-A-33 | — | — | — |
| 60 | CAN bus high | — | W87 | — | 0.5 | MS3PROULTIMA-A-34 | — | — | — |
| 62 | Battery constant +12V (term 30) | — | W4 | — | 0.85 | MS3PROULTIMA-C-23 | — | — | — |
| 63 | Post-cat lambda heater (Z29) | — | W59 | — | 0.5 | MS3PROULTIMA-A-29 | — | — | — |
| 64 | EVAP canister valve (N80) | — | W68 | — | 0.5 | MS3PROULTIMA-B-12 | — | — | — |
| 65 | Fuel pump relay control | — | W56 | — | 0.5 | MS3PROULTIMA-A-28 | — | — | — |
| 66 | Secondary-air pump relay (J299) | — | W57 | — | 0.5 | MS3PROULTIMA-A-14 | — | — | — |
| 67 | Crash sensor signal | — | W84 | — | 0.5 | MS3PROULTIMA-B-22 | — | — | — |
| 68 | Post-cat lambda signal (G130) | — | W71 | — | 0.5 | MS3PROULTIMA-A-25 | — | — | — |
| 69 | Post-cat lambda signal (G130) | — | W72 | — | 0.5 | MS3PROULTIMA-A-12 | — | — | — |
| 70 | Wideband lambda Nernst signal (G39) | — | — | — | — | — | — | — | — |
| 71 | Wideband lambda Nernst signal (G39) | — | — | — | — | — | — | — | — |
| 72 | Accelerator pedal position 1 5V supply (G79) | — | W26 | — | 0.5 | MS3PROULTIMA-A-8 | — | — | — |
| 73 | Accelerator pedal position 2 5V supply (G185) | — | W27 | — | 0.5 | MS3PROULTIMA-C-15 | — | — | — |
| 75 | Cruise control switch (E45) | — | W85 | — | 0.5 | MS3PROULTIMA-B-23 | — | — | — |
| 76 | Cruise control switch (E45) | — | W86 | — | 0.5 | MS3PROULTIMA-A-17 | — | — | — |
| 80 | V144 Evap Diagnostic Pump (Pin 1) | — | W61 | — | 0.5 | MS3PROULTIMA-A-30 | — | — | — |
| 82 | Crank position sensor (G28) | — | W32 | — | 0.5 | MS3PROULTIMA-A-6 | — | — | — |
| 83 | Throttle position sensor 5V supply (G187/G188) | — | W28 | — | 0.5 | MS3PROULTIMA-C-22 | — | — | — |
| 84 | Throttle position sensor 1 (G187) | — | W52 | — | 0.5 | MS3PROULTIMA-A-21 | — | — | — |
| 85 | Intake air temperature (G42) | — | W73 | — | 0.5 | MS3PROULTIMA-A-10 | — | — | — |
| 86 | Camshaft position sensor (G40) | — | W34 | — | 0.5 | MS3PROULTIMA-A-26 | — | — | — |
| 88 | Injector 4 (N33) | — | W45 | — | 0.5 | MS3PROULTIMA-B-10 | — | — | — |
| 89 | Injector 2 (N31) | — | W43 | — | 0.5 | MS3PROULTIMA-A-4 | — | — | — |
| 9 | Secondary-air injection valve (N112) | — | W69 | — | 0.5 | MS3PROULTIMA-B-2 | — | — | — |
| 90 | Crank position sensor ground (G28) | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 91 | Throttle position sensor ground (G187/G188) | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 92 | Throttle position sensor 2 (G188) | — | W54 | — | 0.5 | MS3PROULTIMA-A-23 | — | — | — |
| 93 | Engine coolant temperature (G62) | — | W55 | — | 0.5 | MS3PROULTIMA-A-11 | — | — | — |
| 94 | Ignition coil 4 (N163) | — | W41 | — | 0.5 | MS3PROULTIMA-B-16 | — | — | — |
| 95 | Ignition coil 2 (N128) | — | W39 | — | 0.5 | MS3PROULTIMA-B-14 | — | — | — |
| 96 | Injector 1 (N30) | — | W42 | — | 0.5 | MS3PROULTIMA-A-3 | — | — | — |
| 97 | Injector 3 (N32) | — | W44 | — | 0.5 | MS3PROULTIMA-B-1 | — | — | — |
| 98 | Cam + boost sensor 5V supply (G40/G31) | — | W29 | — | 0.5 | SP-5V1-1 | — | — | — |
| 99 | Knock sensor 5V supply (G61/G66) | — | W30 | — | 0.5 | SP-5V1-1 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W13 | — | 0.5 | OEM-T121-108 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-T121-29 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | OEM-T121-34 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | OEM-T121-36 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | OEM-T121-90 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | OEM-T121-91 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | MS3PROULTIMA-A-16 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | MS3PROULTIMA-A-18 | — | — | — |
| 1 | — | — | W21 | — | 0.5 | MS3PROULTIMA-C-17 | — | — | — |
| 1 | — | — | W22 | — | 0.5 | MS3PROULTIMA-C-18 | — | — | — |
| 1 | — | — | W23 | — | 0.5 | MS3PROULTIMA-C-19 | — | — | — |
| 1 | — | — | W24 | — | 0.5 | MS3PROULTIMA-C-20 | — | — | — |
| 1 | — | — | W25 | — | 0.5 | MS3PROULTIMA-C-21 | — | — | — |
| 1 | — | — | W33 | — | 0.5 | MS3PROULTIMA-A-15 | — | — | — |
| 1 | — | — | W35 | — | 0.5 | MS3PROULTIMA-A-27 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-T121-121 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | OEM-T121-21 | — | — | — |
| 1 | — | — | W3 | — | 0.85 | MS3PROULTIMA-A-35 | — | — | — |
SP-5V1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W29 | — | 0.5 | OEM-T121-98 | — | — | — |
| 1 | — | — | W30 | — | 0.5 | OEM-T121-99 | — | — | — |
| 1 | — | — | W31 | — | 0.5 | MS3PROULTIMA-C-8 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W5 | — | 0.85 | OEM-T121-1 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-T121-2 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | MS3PROULTIMA-A-13 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | MS3PROULTIMA-B-18 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | MS3PROULTIMA-B-3 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | MS3PROULTIMA-B-5 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | MS3PROULTIMA-B-7 | — | — | — |
| 1 | — | — | W12 | — | 0.85 | MS3PROULTIMA-B-9 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-T121-1 | ECU ground | ground | MS3PROULTIMA-A-13 + MS3PROULTIMA-B-18 + MS3PROULTIMA-B-3 + MS3PROULTIMA-B-5 + MS3PROULTIMA-B-7 + MS3PROULTIMA-B-9 | Power ground + Ground + Ground + Ground + Ground + Ground | ground | corroborated | |
| OEM-T121-101 | Boost pressure sensor (G31) | analog_in | MS3PROULTIMA-A-20 | Analog in 2 | analog_in | corroborated | |
| OEM-T121-102 | Ignition coil 1 (N127) | ignition_out | MS3PROULTIMA-B-13 | Spark out G | ignition_out | corroborated | |
| OEM-T121-103 | Ignition coil 3 (N158) | ignition_out | MS3PROULTIMA-B-15 | Spark out C | ignition_out | corroborated | |
| OEM-T121-104 | Boost control solenoid (N75) | low_side_out | MS3PROULTIMA-C-2 | PWM out 4 | low_side_out | corroborated | |
| OEM-T121-105 | Diverter valve (N249) | low_side_out | MS3PROULTIMA-C-1 | PWM out 5 | low_side_out | corroborated | |
| OEM-T121-106 | Knock sensor 1 (G61) | knock_in | MS3PROULTIMA-A-31 | Knock in 1 | knock_in | corroborated | |
| OEM-T121-107 | Knock sensor 2 (G66) | knock_in | MS3PROULTIMA-A-7 | Knock In 2 | knock_in | corroborated | |
| OEM-T121-108 | Sensor ground | sensor_ground | MS3PROULTIMA-A-15 + MS3PROULTIMA-A-16 + MS3PROULTIMA-A-18 + MS3PROULTIMA-A-27 + MS3PROULTIMA-C-17 + MS3PROULTIMA-C-18 + MS3PROULTIMA-C-19 + MS3PROULTIMA-C-20 + MS3PROULTIMA-C-21 | CKP− + Logic ground + Sensor return + CMP− + Sensor return + Sensor return + Sensor return + Sensor return + Sensor return | sensor_ground + trigger_in | corroborated | |
| OEM-T121-115 | VVT camshaft adjustment valve (N205) | low_side_out | MS3PROULTIMA-A-1 | High current out 1 | low_side_out | corroborated | |
| OEM-T121-117 | Throttle motor G186 (+) | hbridge_out | MS3PROULTIMA-B-30 | Stepper IAC out 1B | hbridge_out | corroborated | |
| OEM-T121-118 | Throttle motor G186 (−) | hbridge_out | MS3PROULTIMA-B-31 | Stepper IAC out 1A | hbridge_out | corroborated | |
| OEM-T121-121 | ECM + coil power (J271 relay feed) | power_in | MS3PROULTIMA-A-35 | 12V+ switched power in | power_in | corroborated | |
| OEM-T121-2 | ECU ground | ground | MS3PROULTIMA-A-13 + MS3PROULTIMA-B-18 + MS3PROULTIMA-B-3 + MS3PROULTIMA-B-5 + MS3PROULTIMA-B-7 + MS3PROULTIMA-B-9 | Power ground + Ground + Ground + Ground + Ground + Ground | ground | corroborated | |
| OEM-T121-21 | ECM power (J271 relay feed) | power_in | MS3PROULTIMA-A-35 | 12V+ switched power in | power_in | corroborated | |
| OEM-T121-22 | Brake vacuum pump (V192) | low_side_out | MS3PROULTIMA-A-2 | High current out 2 | low_side_out | single_source | |
| OEM-T121-25 | V144 Evaporative diagnostic pump (Pin 2) | low_side_out | MS3PROULTIMA-C-3 | Digital out 2 | low_side_out | corroborated | |
| OEM-T121-27 | MAF sensor supply (G70) | power_in | — | — | — | corroborated | |
| OEM-T121-28 | Alternator DF terminal (charge warning) | digital_in | MS3PROULTIMA-A-32 | Digital switched in 1 | digital_in | single_source | |
| OEM-T121-29 | MAF sensor ground (G70) | sensor_ground | MS3PROULTIMA-A-15 + MS3PROULTIMA-A-16 + MS3PROULTIMA-A-18 + MS3PROULTIMA-A-27 + MS3PROULTIMA-C-17 + MS3PROULTIMA-C-18 + MS3PROULTIMA-C-19 + MS3PROULTIMA-C-20 + MS3PROULTIMA-C-21 | CKP− + Logic ground + Sensor return + CMP− + Sensor return + Sensor return + Sensor return + Sensor return + Sensor return | sensor_ground + trigger_in | corroborated | |
| OEM-T121-3 | Ignition switch +12V (term 15) | digital_in | MS3PROULTIMA-B-19 | Digital switched 12V in | digital_in | corroborated | |
| OEM-T121-33 | Accelerator pedal position 1 (G79) | analog_in | MS3PROULTIMA-A-9 | TPS in | analog_in | corroborated | |
| OEM-T121-34 | Accelerator pedal position 1 ground (G79) | sensor_ground | MS3PROULTIMA-A-15 + MS3PROULTIMA-A-16 + MS3PROULTIMA-A-18 + MS3PROULTIMA-A-27 + MS3PROULTIMA-C-17 + MS3PROULTIMA-C-18 + MS3PROULTIMA-C-19 + MS3PROULTIMA-C-20 + MS3PROULTIMA-C-21 | CKP− + Logic ground + Sensor return + CMP− + Sensor return + Sensor return + Sensor return + Sensor return + Sensor return | sensor_ground + trigger_in | corroborated | |
| OEM-T121-35 | Accelerator pedal position 2 (G185) | analog_in | MS3PROULTIMA-A-22 | Analog In 4 | analog_in | corroborated | |
| OEM-T121-36 | Accelerator pedal position 2 ground (G185) | sensor_ground | MS3PROULTIMA-A-15 + MS3PROULTIMA-A-16 + MS3PROULTIMA-A-18 + MS3PROULTIMA-A-27 + MS3PROULTIMA-C-17 + MS3PROULTIMA-C-18 + MS3PROULTIMA-C-19 + MS3PROULTIMA-C-20 + MS3PROULTIMA-C-21 | CKP− + Logic ground + Sensor return + CMP− + Sensor return + Sensor return + Sensor return + Sensor return + Sensor return | sensor_ground + trigger_in | corroborated | |
| OEM-T121-37 | Engine speed signal (tacho to cluster) | tacho_out | MS3PROULTIMA-A-24 | Tach out | tacho_out | corroborated | |
| OEM-T121-38 | Cruise control switch (E45) | digital_in | MS3PROULTIMA-B-20 | Digital switched in 2 | digital_in | single_source | |
| OEM-T121-39 | Clutch pedal switch (F36) | digital_in | MS3PROULTIMA-B-29 | Digital switched in 3 | digital_in | single_source | |
| OEM-T121-40 | A/C signal | digital_in | MS3PROULTIMA-C-11 | Digital switched in 4 | digital_in | single_source | |
| OEM-T121-41 | A/C signal | digital_in | MS3PROULTIMA-C-10 | Digital switched in 5 | digital_in | single_source | |
| OEM-T121-43 | K-line diagnostics (OBD pin 7) | serial | — | — | — | corroborated | |
| OEM-T121-47 | Check engine light (MIL) | low_side_out | MS3PROULTIMA-A-5 | High current out 3 | low_side_out | corroborated | |
| OEM-T121-48 | EPC warning light | low_side_out | MS3PROULTIMA-B-11 | Injector out G | injector_out | corroborated | |
| OEM-T121-49 | Power steering pressure switch (F88) | digital_in | MS3PROULTIMA-B-34 | Digital Frequency in 1 VR+ | digital_in | single_source | |
| OEM-T121-5 | Wideband lambda heater (Z19) | low_side_out | MS3PROULTIMA-C-4 | Digital out 1 | low_side_out | corroborated | |
| OEM-T121-50 | Power steering pressure switch supply (F88) | power_in | — | — | — | single_source | |
| OEM-T121-51 | Wideband lambda pump (G39) | wb_ip | — | — | — | corroborated | |
| OEM-T121-52 | Wideband lambda pump (G39) | wb_ip | — | — | — | corroborated | |
| OEM-T121-53 | MAF sensor signal (G70) | analog_in | MS3PROULTIMA-A-19 | Analog in 1 | analog_in | corroborated | |
| OEM-T121-54 | Road speed signal (VSS) | digital_in | MS3PROULTIMA-B-28 | Digital frequency in 1 | digital_in | corroborated | |
| OEM-T121-55 | Brake pedal switch (F) | digital_in | MS3PROULTIMA-B-35 | Digital Frequency in 1 VR− | digital_in | single_source | |
| OEM-T121-56 | Brake pedal switch (F) | digital_in | MS3PROULTIMA-B-17 | Digital frequency in 2 | digital_in | single_source | |
| OEM-T121-57 | Cruise control switch (E45) | digital_in | MS3PROULTIMA-B-21 | Digital frequency in 3 | digital_in | single_source | |
| OEM-T121-58 | CAN bus low | can_l | MS3PROULTIMA-A-33 | CAN L | can_l | corroborated | |
| OEM-T121-60 | CAN bus high | can_h | MS3PROULTIMA-A-34 | CAN H | can_h | corroborated | |
| OEM-T121-62 | Battery constant +12V (term 30) | power_in | MS3PROULTIMA-C-23 | Keep alive power | power_in | corroborated | |
| OEM-T121-63 | Post-cat lambda heater (Z29) | low_side_out | MS3PROULTIMA-A-29 | PWM out 2 | low_side_out | corroborated | |
| OEM-T121-64 | EVAP canister valve (N80) | low_side_out | MS3PROULTIMA-B-12 | Injector out H | injector_out | corroborated | |
| OEM-T121-65 | Fuel pump relay control | low_side_out | MS3PROULTIMA-A-28 | Fuel pump relay out | low_side_out | corroborated | |
| OEM-T121-66 | Secondary-air pump relay (J299) | low_side_out | MS3PROULTIMA-A-14 | PWM / Idle Out 1 | low_side_out | corroborated | |
| OEM-T121-67 | Crash sensor signal | digital_in | MS3PROULTIMA-B-22 | Digital Frequency in 3 VR+ | digital_in | single_source | |
| OEM-T121-68 | Post-cat lambda signal (G130) | lambda_nb_in | MS3PROULTIMA-A-25 | O2 in | lambda_nb_in | corroborated | |
| OEM-T121-69 | Post-cat lambda signal (G130) | lambda_nb_in | MS3PROULTIMA-A-12 | Analog In 6 | analog_in | corroborated | |
| OEM-T121-70 | Wideband lambda Nernst signal (G39) | wb_vs | — | — | — | corroborated | |
| OEM-T121-71 | Wideband lambda Nernst signal (G39) | wb_vs | — | — | — | corroborated | |
| OEM-T121-72 | Accelerator pedal position 1 5V supply (G79) | vref | MS3PROULTIMA-A-8 | 5V+ VREF out 1 | vref | corroborated | |
| OEM-T121-73 | Accelerator pedal position 2 5V supply (G185) | vref | MS3PROULTIMA-C-15 | 5V+ VREF out 2 | vref | corroborated | |
| OEM-T121-75 | Cruise control switch (E45) | digital_in | MS3PROULTIMA-B-23 | Digital Frequency In 3 VR− | digital_in | single_source | |
| OEM-T121-76 | Cruise control switch (E45) | digital_in | MS3PROULTIMA-A-17 | Analog In 7 | analog_in | single_source | |
| OEM-T121-80 | V144 Evap Diagnostic Pump (Pin 1) | low_side_out | MS3PROULTIMA-A-30 | PWM out 3 | low_side_out | corroborated | |
| OEM-T121-82 | Crank position sensor (G28) | trigger_in | MS3PROULTIMA-A-6 | CKP+ | trigger_in | corroborated | |
| OEM-T121-83 | Throttle position sensor 5V supply (G187/G188) | vref | MS3PROULTIMA-C-22 | 5V+ VREF out 1 | vref | corroborated | |
| OEM-T121-84 | Throttle position sensor 1 (G187) | analog_in | MS3PROULTIMA-A-21 | Analog in 3 | analog_in | corroborated | |
| OEM-T121-85 | Intake air temperature (G42) | temp_in | MS3PROULTIMA-A-10 | MAT in | temp_in | corroborated | |
| OEM-T121-86 | Camshaft position sensor (G40) | trigger_in | MS3PROULTIMA-A-26 | CMP+ | trigger_in | corroborated | |
| OEM-T121-88 | Injector 4 (N33) | injector_out | MS3PROULTIMA-B-10 | Injector out F | injector_out | corroborated | |
| OEM-T121-89 | Injector 2 (N31) | injector_out | MS3PROULTIMA-A-4 | Injector out I | injector_out | corroborated | |
| OEM-T121-9 | Secondary-air injection valve (N112) | low_side_out | MS3PROULTIMA-B-2 | Injector out B | injector_out | corroborated | |
| OEM-T121-90 | Crank position sensor ground (G28) | sensor_ground | MS3PROULTIMA-A-15 + MS3PROULTIMA-A-16 + MS3PROULTIMA-A-18 + MS3PROULTIMA-A-27 + MS3PROULTIMA-C-17 + MS3PROULTIMA-C-18 + MS3PROULTIMA-C-19 + MS3PROULTIMA-C-20 + MS3PROULTIMA-C-21 | CKP− + Logic ground + Sensor return + CMP− + Sensor return + Sensor return + Sensor return + Sensor return + Sensor return | sensor_ground + trigger_in | corroborated | |
| OEM-T121-91 | Throttle position sensor ground (G187/G188) | sensor_ground | MS3PROULTIMA-A-15 + MS3PROULTIMA-A-16 + MS3PROULTIMA-A-18 + MS3PROULTIMA-A-27 + MS3PROULTIMA-C-17 + MS3PROULTIMA-C-18 + MS3PROULTIMA-C-19 + MS3PROULTIMA-C-20 + MS3PROULTIMA-C-21 | CKP− + Logic ground + Sensor return + CMP− + Sensor return + Sensor return + Sensor return + Sensor return + Sensor return | sensor_ground + trigger_in | corroborated | |
| OEM-T121-92 | Throttle position sensor 2 (G188) | analog_in | MS3PROULTIMA-A-23 | Analog In 5 | analog_in | corroborated | |
| OEM-T121-93 | Engine coolant temperature (G62) | temp_in | MS3PROULTIMA-A-11 | CLT in | temp_in | corroborated | |
| OEM-T121-94 | Ignition coil 4 (N163) | ignition_out | MS3PROULTIMA-B-16 | Spark out H | ignition_out | corroborated | |
| OEM-T121-95 | Ignition coil 2 (N128) | ignition_out | MS3PROULTIMA-B-14 | Spark out E | ignition_out | corroborated | |
| OEM-T121-96 | Injector 1 (N30) | injector_out | MS3PROULTIMA-A-3 | Injector out J | injector_out | corroborated | |
| OEM-T121-97 | Injector 3 (N32) | injector_out | MS3PROULTIMA-B-1 | Injector out A | injector_out | corroborated | |
| OEM-T121-98 | Cam + boost sensor 5V supply (G40/G31) | vref | MS3PROULTIMA-C-8 | 5V+ VREF out 2 | vref | corroborated | |
| OEM-T121-99 | Knock sensor 5V supply (G61/G66) | vref | MS3PROULTIMA-C-8 | 5V+ VREF out 2 | vref | corroborated |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-T121-121 | SP-14V-1 | 0.85 | no route | ECM + coil power (J271 relay feed) | — | |
| W2 | OEM-T121-21 | SP-14V-1 | 0.85 | no route | ECM power (J271 relay feed) | — | |
| W3 | SP-14V-1 | MS3PROULTIMA-A-35 | 0.85 | no route | 12V+ switched power in | — | |
| W4 | OEM-T121-62 | MS3PROULTIMA-C-23 | 0.85 | no route | Battery constant +12V (term 30) | — | |
| W5 | OEM-T121-1 | SP-GND-1 | 0.85 | no route | ECU ground | — | |
| W6 | OEM-T121-2 | SP-GND-1 | 0.85 | no route | ECU ground | — | |
| W7 | SP-GND-1 | MS3PROULTIMA-A-13 | 0.85 | no route | Power ground | — | |
| W8 | SP-GND-1 | MS3PROULTIMA-B-18 | 0.85 | no route | Ground | — | |
| W9 | SP-GND-1 | MS3PROULTIMA-B-3 | 0.85 | no route | Ground | — | |
| W10 | SP-GND-1 | MS3PROULTIMA-B-5 | 0.85 | no route | Ground | — | |
| W11 | SP-GND-1 | MS3PROULTIMA-B-7 | 0.85 | no route | Ground | — | |
| W12 | SP-GND-1 | MS3PROULTIMA-B-9 | 0.85 | no route | Ground | — | |
| W13 | OEM-T121-108 | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W14 | OEM-T121-29 | SP-0V-1 | 0.5 | no route | MAF sensor ground (G70) | — | |
| W15 | OEM-T121-34 | SP-0V-1 | 0.5 | no route | Accelerator pedal position 1 ground (G79) | — | |
| W16 | OEM-T121-36 | SP-0V-1 | 0.5 | no route | Accelerator pedal position 2 ground (G185) | — | |
| W17 | OEM-T121-90 | SP-0V-1 | 0.5 | no route | Crank position sensor ground (G28) | — | |
| W18 | OEM-T121-91 | SP-0V-1 | 0.5 | no route | Throttle position sensor ground (G187/G188) | — | |
| W19 | SP-0V-1 | MS3PROULTIMA-A-16 | 0.5 | no route | Logic ground | — | |
| W20 | SP-0V-1 | MS3PROULTIMA-A-18 | 0.5 | no route | Sensor return | — | |
| W21 | SP-0V-1 | MS3PROULTIMA-C-17 | 0.5 | no route | Sensor return | — | |
| W22 | SP-0V-1 | MS3PROULTIMA-C-18 | 0.5 | no route | Sensor return | — | |
| W23 | SP-0V-1 | MS3PROULTIMA-C-19 | 0.5 | no route | Sensor return | — | |
| W24 | SP-0V-1 | MS3PROULTIMA-C-20 | 0.5 | no route | Sensor return | — | |
| W25 | SP-0V-1 | MS3PROULTIMA-C-21 | 0.5 | no route | Sensor return | — | |
| W26 | OEM-T121-72 | MS3PROULTIMA-A-8 | 0.5 | no route | Accelerator pedal position 1 5V supply (G79) | — | |
| W27 | OEM-T121-73 | MS3PROULTIMA-C-15 | 0.5 | no route | Accelerator pedal position 2 5V supply (G185) | — | |
| W28 | OEM-T121-83 | MS3PROULTIMA-C-22 | 0.5 | no route | Throttle position sensor 5V supply (G187/G188) | — | |
| W29 | OEM-T121-98 | SP-5V1-1 | 0.5 | no route | Cam + boost sensor 5V supply (G40/G31) | — | |
| W30 | OEM-T121-99 | SP-5V1-1 | 0.5 | no route | Knock sensor 5V supply (G61/G66) | — | |
| W31 | SP-5V1-1 | MS3PROULTIMA-C-8 | 0.5 | no route | 5V+ VREF out 2 | — | |
| W32 | OEM-T121-82 | MS3PROULTIMA-A-6 | 0.5 | no route | Crank position sensor (G28) | — | |
| W33 | SP-0V-1 | MS3PROULTIMA-A-15 | 0.5 | no route | CKP− | — | |
| W34 | OEM-T121-86 | MS3PROULTIMA-A-26 | 0.5 | no route | Camshaft position sensor (G40) | — | |
| W35 | SP-0V-1 | MS3PROULTIMA-A-27 | 0.5 | no route | CMP− | — | |
| W36 | OEM-T121-106 | MS3PROULTIMA-A-31 | 0.5 | no route | Knock sensor 1 (G61) | — | |
| W37 | OEM-T121-107 | MS3PROULTIMA-A-7 | 0.5 | no route | Knock sensor 2 (G66) | — | |
| W38 | OEM-T121-102 | MS3PROULTIMA-B-13 | 0.5 | no route | Ignition coil 1 (N127) | — | |
| W39 | OEM-T121-95 | MS3PROULTIMA-B-14 | 0.5 | no route | Ignition coil 2 (N128) | — | |
| W40 | OEM-T121-103 | MS3PROULTIMA-B-15 | 0.5 | no route | Ignition coil 3 (N158) | — | |
| W41 | OEM-T121-94 | MS3PROULTIMA-B-16 | 0.5 | no route | Ignition coil 4 (N163) | — | |
| W42 | OEM-T121-96 | MS3PROULTIMA-A-3 | 0.5 | no route | Injector 1 (N30) | — | |
| W43 | OEM-T121-89 | MS3PROULTIMA-A-4 | 0.5 | no route | Injector 2 (N31) | — | |
| W44 | OEM-T121-97 | MS3PROULTIMA-B-1 | 0.5 | no route | Injector 3 (N32) | — | |
| W45 | OEM-T121-88 | MS3PROULTIMA-B-10 | 0.5 | no route | Injector 4 (N33) | — | |
| W46 | OEM-T121-118 | MS3PROULTIMA-B-31 | 0.5 | no route | Throttle motor G186 (−) | — | |
| W47 | OEM-T121-117 | MS3PROULTIMA-B-30 | 0.5 | no route | Throttle motor G186 (+) | — | |
| W48 | OEM-T121-3 | MS3PROULTIMA-B-19 | 0.5 | no route | Ignition switch +12V (term 15) | — | |
| W49 | OEM-T121-53 | MS3PROULTIMA-A-19 | 0.5 | no route | MAF sensor signal (G70) | — | |
| W50 | OEM-T121-101 | MS3PROULTIMA-A-20 | 0.5 | no route | Boost pressure sensor (G31) | — | |
| W51 | OEM-T121-33 | MS3PROULTIMA-A-9 | 0.5 | no route | Accelerator pedal position 1 (G79) | — | |
| W52 | OEM-T121-84 | MS3PROULTIMA-A-21 | 0.5 | no route | Throttle position sensor 1 (G187) | — | |
| W53 | OEM-T121-35 | MS3PROULTIMA-A-22 | 0.5 | no route | Accelerator pedal position 2 (G185) | — | |
| W54 | OEM-T121-92 | MS3PROULTIMA-A-23 | 0.5 | no route | Throttle position sensor 2 (G188) | — | |
| W55 | OEM-T121-93 | MS3PROULTIMA-A-11 | 0.5 | no route | Engine coolant temperature (G62) | — | |
| W56 | OEM-T121-65 | MS3PROULTIMA-A-28 | 0.5 | no route | Fuel pump relay control | — | |
| W57 | OEM-T121-66 | MS3PROULTIMA-A-14 | 0.5 | no route | Secondary-air pump relay (J299) | — | |
| W58 | OEM-T121-5 | MS3PROULTIMA-C-4 | 0.5 | no route | Wideband lambda heater (Z19) | — | |
| W59 | OEM-T121-63 | MS3PROULTIMA-A-29 | 0.5 | no route | Post-cat lambda heater (Z29) | — | |
| W60 | OEM-T121-25 | MS3PROULTIMA-C-3 | 0.5 | no route | V144 Evaporative diagnostic pump (Pin 2) | — | |
| W61 | OEM-T121-80 | MS3PROULTIMA-A-30 | 0.5 | no route | V144 Evap Diagnostic Pump (Pin 1) | — | |
| W62 | OEM-T121-104 | MS3PROULTIMA-C-2 | 0.5 | no route | Boost control solenoid (N75) | — | |
| W63 | OEM-T121-105 | MS3PROULTIMA-C-1 | 0.5 | no route | Diverter valve (N249) | — | |
| W64 | OEM-T121-115 | MS3PROULTIMA-A-1 | 0.5 | no route | VVT camshaft adjustment valve (N205) | — | |
| W65 | OEM-T121-22 | MS3PROULTIMA-A-2 | 0.5 | no route | Brake vacuum pump (V192) | — | |
| W66 | OEM-T121-47 | MS3PROULTIMA-A-5 | 0.5 | no route | Check engine light (MIL) | — | |
| W67 | OEM-T121-48 | MS3PROULTIMA-B-11 | 0.5 | no route | EPC warning light | — | |
| W68 | OEM-T121-64 | MS3PROULTIMA-B-12 | 0.5 | no route | EVAP canister valve (N80) | — | |
| W69 | OEM-T121-9 | MS3PROULTIMA-B-2 | 0.5 | no route | Secondary-air injection valve (N112) | — | |
| W70 | OEM-T121-37 | MS3PROULTIMA-A-24 | 0.5 | no route | Engine speed signal (tacho to cluster) | — | |
| W71 | OEM-T121-68 | MS3PROULTIMA-A-25 | 0.5 | no route | Post-cat lambda signal (G130) | — | |
| W72 | OEM-T121-69 | MS3PROULTIMA-A-12 | 0.5 | no route | Post-cat lambda signal (G130) | — | |
| W73 | OEM-T121-85 | MS3PROULTIMA-A-10 | 0.5 | no route | Intake air temperature (G42) | — | |
| W74 | OEM-T121-54 | MS3PROULTIMA-B-28 | 0.5 | no route | Road speed signal (VSS) | — | |
| W75 | OEM-T121-28 | MS3PROULTIMA-A-32 | 0.5 | no route | Alternator DF terminal (charge warning) | — | |
| W76 | OEM-T121-38 | MS3PROULTIMA-B-20 | 0.5 | no route | Cruise control switch (E45) | — | |
| W77 | OEM-T121-39 | MS3PROULTIMA-B-29 | 0.5 | no route | Clutch pedal switch (F36) | — | |
| W78 | OEM-T121-40 | MS3PROULTIMA-C-11 | 0.5 | no route | A/C signal | — | |
| W79 | OEM-T121-41 | MS3PROULTIMA-C-10 | 0.5 | no route | A/C signal | — | |
| W80 | OEM-T121-49 | MS3PROULTIMA-B-34 | 0.5 | no route | Power steering pressure switch (F88) | — | |
| W81 | OEM-T121-55 | MS3PROULTIMA-B-35 | 0.5 | no route | Brake pedal switch (F) | — | |
| W82 | OEM-T121-56 | MS3PROULTIMA-B-17 | 0.5 | no route | Brake pedal switch (F) | — | |
| W83 | OEM-T121-57 | MS3PROULTIMA-B-21 | 0.5 | no route | Cruise control switch (E45) | — | |
| W84 | OEM-T121-67 | MS3PROULTIMA-B-22 | 0.5 | no route | Crash sensor signal | — | |
| W85 | OEM-T121-75 | MS3PROULTIMA-B-23 | 0.5 | no route | Cruise control switch (E45) | — | |
| W86 | OEM-T121-76 | MS3PROULTIMA-A-17 | 0.5 | no route | Cruise control switch (E45) | — | |
| W87 | OEM-T121-60 | MS3PROULTIMA-A-34 | 0.5 | no route | CAN bus high | — | |
| W88 | OEM-T121-58 | MS3PROULTIMA-A-33 | 0.5 | no route | CAN bus low | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|
ECU setup sheet
| Role | Engine ref | Engine signal | Sensor | ECU point | ECU function | ECU class | Setup flag |
|---|---|---|---|---|---|---|---|
| No configured channels. | |||||||
Findings
Open (10)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | DBW_MOTOR_CURRENT | MS3PROULTIMA-B-30 | Cannot confirm MS3Pro Ultimate can drive the throttle motor: MS3PROULTIMA-B-30 "Stepper IAC out 1B" is rated 0.75 A peak, but the motor stall current at OEM-T121-117 is unknown. Add the motor's peak current from a source, or measure the motor resistance: peak ≈ 14 V ÷ R (Hondata measured 4.9 A for a Civic Si body, 10.4 A for a ZDX body; holding current is about 1 A). |
| warn | DBW_MOTOR_CURRENT | MS3PROULTIMA-B-31 | Cannot confirm MS3Pro Ultimate can drive the throttle motor: MS3PROULTIMA-B-31 "Stepper IAC out 1A" is rated 0.75 A peak, but the motor stall current at OEM-T121-118 is unknown. Add the motor's peak current from a source, or measure the motor resistance: peak ≈ 14 V ÷ R (Hondata measured 4.9 A for a Civic Si body, 10.4 A for a ZDX body; holding current is about 1 A). |
| warn | DBW_SHARED_5V | MS3PROULTIMA-C-8 + OEM-T121-98 + OEM-T121-99 + SP-5V1-1 | These 5 V supplies are separate in the stock car (OEM-T121-98 [cam_boost], OEM-T121-99 [knock]) and here share one ECU 5 V (MS3PROULTIMA-C-8). On a drive-by-wire car the OEM splits them so one short or fault can't corrupt both throttle/pedal tracks at once. MS3Pro Ultimate has 4 5 V sensor supply pin(s). All are in use, so decide: accept the shared supply (and rely on the ECU's DBW fault checks), or add a separate regulated 5 V for the sub tracks. |
| warn | NET_FAMILY | OEM-T121-76 ↔ MS3PROULTIMA-A-17 | OEM-T121-76 "Cruise control switch (E45)" [digital_in] is wired to MS3PROULTIMA-A-17 "Analog In 7" [analog_in]. Analog and digital on one net. A switch on an analog input works with a pull-up and a threshold; an analog sensor on a digital input loses its value. |
| warn | SUPPLY_GROUP | MS3PROULTIMA-C-8 + OEM-T121-98 + OEM-T121-99 + SP-5V1-1 | Supplies meant to stay independent share one net: OEM-T121-98 [cam_boost], OEM-T121-99 [knock]. The new ECU has no free 5 V reference, so they share one: normal on a standalone, but a short on any of these sensors drops them all. |
| info | NET_FAMILY | MS3PROULTIMA-A-18 ↔ MS3PROULTIMA-A-27 | MS3PROULTIMA-A-18 "Sensor return" [sensor_ground] is wired to MS3PROULTIMA-A-27 "CMP−" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | NET_FAMILY | OEM-T121-48 ↔ MS3PROULTIMA-B-11 | OEM-T121-48 "EPC warning light" [low_side_out] is wired to MS3PROULTIMA-B-11 "Injector out G" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-T121-64 ↔ MS3PROULTIMA-B-12 | OEM-T121-64 "EVAP canister valve (N80)" [low_side_out] is wired to MS3PROULTIMA-B-12 "Injector out H" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | NET_FAMILY | OEM-T121-9 ↔ MS3PROULTIMA-B-2 | OEM-T121-9 "Secondary-air injection valve (N112)" [low_side_out] is wired to MS3PROULTIMA-B-2 "Injector out B" [injector_out]. Injector drivers can usually run general low-side loads; check current and PWM frequency. |
| info | UNMAPPED | OEM | 7 optional OEM pins are not mapped: OEM-T121-27 MAF sensor supply (G70); OEM-T121-43 K-line diagnostics (OBD pin 7); OEM-T121-50 Power steering pressure switch supply (F88); OEM-T121-51 Wideband lambda pump (G39); OEM-T121-52 Wideband lambda pump (G39); OEM-T121-70 Wideband lambda Nernst signal (G39); OEM-T121-71 Wideband lambda Nernst signal (G39) |
Accepted (0)
| Code | Subject | Reason | By |
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Notes
Auto-mapped by auto_map() from the library pin data on 2026-10-23. Review every wire against both manuals before building. Not wired: - OEM-T121 51: Wideband lambda pump (G39): no free wb_ip on AMP EFI MS3Pro Ultimate - OEM-T121 52: Wideband lambda pump (G39): no free wb_ip on AMP EFI MS3Pro Ultimate - OEM-T121 70: Wideband lambda Nernst signal (G39): no free wb_vs on AMP EFI MS3Pro Ultimate - OEM-T121 71: Wideband lambda Nernst signal (G39): no free wb_vs on AMP EFI MS3Pro Ultimate - OEM-T121 43: K-line diagnostics (OBD pin 7): no free k_line on AMP EFI MS3Pro Ultimate - OEM-T121 27: MAF sensor supply (G70): no rule for class sensor_supply_in; wire by hand - OEM-T121 50: Power steering pressure switch supply (F88): no rule for class sensor_supply_in; wire by hand
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | AMP EFI: MS3Pro Ultimate manual (v1.210, fw 1.5.2) pinout tables | https://cdn.shopify.com/s/files/1/0960/0014/7754/files/MS3Pro_User_Manual_Firmware_1.5.2_ULTIMATE.pdf?v=1760706068 | archive | 2026-10-05 | 71ed7ed81581 |
| 3 | community_copy | NefMoto: ME7.5 1.8t Golf AWP ECU wiring breakdown (Bentley-derived) | https://nefariousmotorsports.com/forum/index.php?topic=18710.0 | — | — | — |
| 3 | community_copy | NefMoto: ME7.5 ECU bench-flashing power/ground pins | http://nefmoto.com/wiki/index.php?title=ECU_Bench_Flashing | — | — | — |
| 3 | community_copy | vwressources: Bosch Motronic ME7.5 (AMK/ARY/AUQ/ARX/AUM) T121 pinout | https://www.vwressources.planethoster.world/me75_pinout.html | — | — | — |