VW Golf Mk4 1.8T 20v (AUM, Bosch ME7.5) DBW → AMP EFI MS3Pro EVO+ HC (auto)
VW Golf Mk4 1.8T 20v (AUM, Bosch ME7.5) DBW — AMP EFI — MS3Pro EVO+ HC
Drawn by Michael Gnankou · Rev 0 · proposal · 2026-10-12
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 | 71 wires · 9 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 | MS3PROEVOHC-A-35 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-T121-1 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-T121-2 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | SP-GND-1 | MS3PROEVOHC-B-3 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | MS3PROEVOHC-B-5 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | MS3PROEVOHC-B-7 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | MS3PROEVOHC-B-9 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-T121-108 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-T121-29 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-T121-34 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-T121-36 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-T121-90 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-T121-91 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | MS3PROEVOHC-A-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | SP-0V-1 | MS3PROEVOHC-A-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | SP-0V-1 | MS3PROEVOHC-C-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | SP-0V-1 | MS3PROEVOHC-C-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | SP-0V-1 | MS3PROEVOHC-C-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | SP-0V-1 | MS3PROEVOHC-C-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | SP-0V-1 | MS3PROEVOHC-C-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-T121-72 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-T121-98 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | SP-5V1-1 | MS3PROEVOHC-A-8 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-T121-73 | SP-5V2-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-T121-99 | SP-5V2-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | SP-5V2-1 | MS3PROEVOHC-C-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-T121-83 | MS3PROEVOHC-C-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-T121-82 | MS3PROEVOHC-A-6 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | SP-0V-1 | MS3PROEVOHC-A-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-T121-86 | MS3PROEVOHC-A-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | SP-0V-1 | MS3PROEVOHC-A-27 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-T121-106 | MS3PROEVOHC-A-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-T121-107 | MS3PROEVOHC-A-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-T121-102 | MS3PROEVOHC-B-13 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-T121-95 | MS3PROEVOHC-B-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-T121-103 | MS3PROEVOHC-B-15 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-T121-94 | MS3PROEVOHC-B-16 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-T121-96 | MS3PROEVOHC-A-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-T121-89 | MS3PROEVOHC-A-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-T121-97 | MS3PROEVOHC-B-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-T121-88 | MS3PROEVOHC-B-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-T121-118 | MS3PROEVOHC-B-31 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-T121-117 | MS3PROEVOHC-B-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-T121-3 | MS3PROEVOHC-B-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-T121-53 | MS3PROEVOHC-A-19 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-T121-101 | MS3PROEVOHC-A-20 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-T121-33 | MS3PROEVOHC-A-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-T121-84 | MS3PROEVOHC-A-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-T121-35 | MS3PROEVOHC-A-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | OEM-T121-92 | MS3PROEVOHC-A-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | OEM-T121-93 | MS3PROEVOHC-A-11 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | OEM-T121-65 | MS3PROEVOHC-A-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W55 | OEM-T121-66 | MS3PROEVOHC-A-14 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W56 | OEM-T121-5 | MS3PROEVOHC-C-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W57 | OEM-T121-63 | MS3PROEVOHC-A-29 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W58 | OEM-T121-104 | MS3PROEVOHC-C-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W59 | OEM-T121-105 | MS3PROEVOHC-A-30 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W60 | OEM-T121-115 | MS3PROEVOHC-C-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W61 | OEM-T121-47 | MS3PROEVOHC-C-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W62 | OEM-T121-48 | MS3PROEVOHC-A-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W63 | OEM-T121-64 | MS3PROEVOHC-A-2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W64 | OEM-T121-9 | MS3PROEVOHC-A-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W65 | OEM-T121-37 | MS3PROEVOHC-A-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W66 | OEM-T121-68 | MS3PROEVOHC-A-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W67 | OEM-T121-69 | MS3PROEVOHC-A-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W68 | OEM-T121-85 | MS3PROEVOHC-A-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W69 | OEM-T121-54 | MS3PROEVOHC-B-28 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W70 | OEM-T121-60 | MS3PROEVOHC-A-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W71 | OEM-T121-58 | MS3PROEVOHC-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 | MS3PROEVOHC-A-13 | MS3PROEVOHC-A-35 | open (OL) | sensor ground must not touch +12 V supply | |
| 2 | MS3PROEVOHC-A-13 | MS3PROEVOHC-A-8 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 3 | MS3PROEVOHC-A-13 | MS3PROEVOHC-C-15 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 4 | MS3PROEVOHC-A-13 | MS3PROEVOHC-C-22 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 5 | MS3PROEVOHC-A-35 | MS3PROEVOHC-A-8 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 6 | MS3PROEVOHC-A-35 | MS3PROEVOHC-C-15 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 7 | MS3PROEVOHC-A-35 | MS3PROEVOHC-C-22 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 8 | MS3PROEVOHC-B-3 | MS3PROEVOHC-A-35 | open (OL) | power ground must not touch +12 V supply | |
| 9 | MS3PROEVOHC-B-3 | MS3PROEVOHC-A-8 | open (OL) | power ground must not touch 5 V sensor reference | |
| 10 | MS3PROEVOHC-B-3 | MS3PROEVOHC-C-15 | open (OL) | power ground must not touch 5 V sensor reference | |
| 11 | MS3PROEVOHC-B-3 | MS3PROEVOHC-C-22 | open (OL) | power ground 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
MS3PROEVOHC-A
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | High current out 1 | — | W62 | — | 0.5 | OEM-T121-48 | — | — | — |
| 10 | MAT in | — | W68 | — | 0.5 | OEM-T121-85 | — | — | — |
| 11 | CLT in | — | W53 | — | 0.5 | OEM-T121-93 | — | — | — |
| 12 | Analog In 6 | — | W67 | — | 0.5 | OEM-T121-69 | — | — | — |
| 13 | Logic Ground | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 14 | PWM / Idle Out 1 | — | W55 | — | 0.5 | OEM-T121-66 | — | — | — |
| 15 | CKP− | — | W31 | — | 0.5 | SP-0V-1 | — | — | — |
| 16 | Ground Shield Drain | — | — | — | — | — | — | — | — |
| 17 | Analog In 7 | — | — | — | — | — | — | — | — |
| 18 | Sensor return | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Analog in 1 | — | W47 | — | 0.5 | OEM-T121-53 | — | — | — |
| 2 | High current out 2 | — | W63 | — | 0.5 | OEM-T121-64 | — | — | — |
| 20 | Analog in 2 | — | W48 | — | 0.5 | OEM-T121-101 | — | — | — |
| 21 | Analog in 3 | — | W50 | — | 0.5 | OEM-T121-84 | — | — | — |
| 22 | Analog In 4 | — | W51 | — | 0.5 | OEM-T121-35 | — | — | — |
| 23 | Analog In 5 | — | W52 | — | 0.5 | OEM-T121-92 | — | — | — |
| 24 | Tach out | — | W65 | — | 0.5 | OEM-T121-37 | — | — | — |
| 25 | O2 in | — | W66 | — | 0.5 | OEM-T121-68 | — | — | — |
| 26 | CMP+ | — | W32 | — | 0.5 | OEM-T121-86 | — | — | — |
| 27 | CMP− | — | W33 | — | 0.5 | SP-0V-1 | — | — | — |
| 28 | Fuel pump relay out | — | W54 | — | 0.5 | OEM-T121-65 | — | — | — |
| 29 | PWM out 2 | — | W57 | — | 0.5 | OEM-T121-63 | — | — | — |
| 3 | Injector out J | — | W40 | — | 0.5 | OEM-T121-96 | — | — | — |
| 30 | PWM out 3 | — | W59 | — | 0.5 | OEM-T121-105 | — | — | — |
| 31 | Knock in 1 | — | W34 | — | 0.5 | OEM-T121-106 | — | — | — |
| 32 | Digital switched in 1 | — | — | — | — | — | — | — | — |
| 33 | CAN L | — | W71 | — | 0.5 | OEM-T121-58 | — | — | — |
| 34 | CAN H | — | W70 | — | 0.5 | OEM-T121-60 | — | — | — |
| 35 | 12V+ switched power in | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
| 4 | Injector out I | — | W41 | — | 0.5 | OEM-T121-89 | — | — | — |
| 5 | High current out 3 | — | W64 | — | 0.5 | OEM-T121-9 | — | — | — |
| 6 | CKP+ | — | W30 | — | 0.5 | OEM-T121-82 | — | — | — |
| 7 | Knock In 2 | — | W35 | — | 0.5 | OEM-T121-107 | — | — | — |
| 8 | 5V+ VREF out | — | W25 | — | 0.5 | SP-5V1-1 | — | — | — |
| 9 | TPS in | — | W49 | — | 0.5 | OEM-T121-33 | — | — | — |
MS3PROEVOHC-B
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Injector out A | — | W42 | — | 0.5 | OEM-T121-97 | — | — | — |
| 10 | Injector out F | — | W43 | — | 0.5 | OEM-T121-88 | — | — | — |
| 11 | Injector out G | — | — | — | — | — | — | — | — |
| 12 | Injector out H | — | — | — | — | — | — | — | — |
| 13 | Spark out G | — | W36 | — | 0.5 | OEM-T121-102 | — | — | — |
| 14 | Spark out E | — | W37 | — | 0.5 | OEM-T121-95 | — | — | — |
| 15 | Spark out C | — | W38 | — | 0.5 | OEM-T121-103 | — | — | — |
| 16 | Spark out H | — | W39 | — | 0.5 | OEM-T121-94 | — | — | — |
| 17 | Digital frequency in 2 (Hall) | — | — | — | — | — | — | — | — |
| 18 | Ground Shield Drain | — | — | — | — | — | — | — | — |
| 19 | Digital switched 12V in | — | W46 | — | 0.5 | OEM-T121-3 | — | — | — |
| 2 | Injector out B | — | — | — | — | — | — | — | — |
| 20 | Digital switched in 2 | — | — | — | — | — | — | — | — |
| 21 | Digital frequency in 3 (unconditioned) | — | — | — | — | — | — | — | — |
| 22 | Digital Frequency in 3 (VR+) | — | — | — | — | — | — | — | — |
| 23 | Digital Frequency In 3 (VR−) | — | — | — | — | — | — | — | — |
| 24 | Spark out F | — | — | — | — | — | — | — | — |
| 25 | Spark out B | — | — | — | — | — | — | — | — |
| 26 | Spark out D | — | — | — | — | — | — | — | — |
| 27 | Spark out A | — | — | — | — | — | — | — | — |
| 28 | Digital frequency in 1 (unconditioned) | — | W69 | — | 0.5 | OEM-T121-54 | — | — | — |
| 29 | Digital switched in 3 | — | — | — | — | — | — | — | — |
| 3 | Ground | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 30 | Stepper IAC out 1B | — | W45 | — | 0.5 | OEM-T121-117 | — | — | — |
| 31 | Stepper IAC out 1A | — | W44 | — | 0.5 | OEM-T121-118 | — | — | — |
| 32 | Stepper IAC out 2A | — | — | — | — | — | — | — | — |
| 33 | Stepper IAC out 2B | — | — | — | — | — | — | — | — |
| 34 | Digital Frequency in 1 (VR+) | — | — | — | — | — | — | — | — |
| 35 | Digital Frequency in 1 (VR−) | — | — | — | — | — | — | — | — |
| 4 | Injector out C | — | — | — | — | — | — | — | — |
| 5 | Ground | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 6 | Injector out D | — | — | — | — | — | — | — | — |
| 7 | Ground | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 8 | Injector out E | — | — | — | — | — | — | — | — |
| 9 | Ground | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
MS3PROEVOHC-C
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | PWM out 5 | — | W61 | — | 0.5 | OEM-T121-47 | — | — | — |
| 10 | Digital switched in 5 | — | — | — | — | — | — | — | — |
| 11 | Digital switched in 4 | — | — | — | — | — | — | — | — |
| 12 | Digital I/O 5 | — | — | — | — | — | — | — | — |
| 13 | Digital I/O 3 | — | — | — | — | — | — | — | — |
| 14 | Digital I/O 1 | — | — | — | — | — | — | — | — |
| 15 | 5V+ VREF out 2 | — | W28 | — | 0.5 | SP-5V2-1 | — | — | — |
| 17 | Sensor return | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| 18 | Sensor return | — | W19 | — | 0.5 | SP-0V-1 | — | — | — |
| 19 | Sensor return | — | W20 | — | 0.5 | SP-0V-1 | — | — | — |
| 2 | PWM out 4 | — | W60 | — | 0.5 | OEM-T121-115 | — | — | — |
| 20 | Sensor return | — | W21 | — | 0.5 | SP-0V-1 | — | — | — |
| 21 | Sensor return | — | W22 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | 5V+ VREF out 1 | — | W29 | — | 0.5 | OEM-T121-83 | — | — | — |
| 3 | Digital out 2 | — | W58 | — | 0.5 | OEM-T121-104 | — | — | — |
| 4 | Digital out 1 | — | W56 | — | 0.5 | OEM-T121-5 | — | — | — |
| 5 | Digital I/O 4 | — | — | — | — | — | — | — | — |
| 6 | Digital I/O 2 | — | — | — | — | — | — | — | — |
| 7 | Analog in 8 | — | — | — | — | — | — | — | — |
OEM-T121
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | ECU ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 101 | Boost pressure sensor (G31) | — | W48 | — | 0.5 | MS3PROEVOHC-A-20 | — | — | — |
| 102 | Ignition coil 1 (N127) | — | W36 | — | 0.5 | MS3PROEVOHC-B-13 | — | — | — |
| 103 | Ignition coil 3 (N158) | — | W38 | — | 0.5 | MS3PROEVOHC-B-15 | — | — | — |
| 104 | Boost control solenoid (N75) | — | W58 | — | 0.5 | MS3PROEVOHC-C-3 | — | — | — |
| 105 | Diverter valve (N249) | — | W59 | — | 0.5 | MS3PROEVOHC-A-30 | — | — | — |
| 106 | Knock sensor 1 (G61) | — | W34 | — | 0.5 | MS3PROEVOHC-A-31 | — | — | — |
| 107 | Knock sensor 2 (G66) | — | W35 | — | 0.5 | MS3PROEVOHC-A-7 | — | — | — |
| 108 | Sensor ground | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 115 | VVT camshaft adjustment valve (N205) | — | W60 | — | 0.5 | MS3PROEVOHC-C-2 | — | — | — |
| 117 | Throttle motor G186 (+) | — | W45 | — | 0.5 | MS3PROEVOHC-B-30 | — | — | — |
| 118 | Throttle motor G186 (−) | — | W44 | — | 0.5 | MS3PROEVOHC-B-31 | — | — | — |
| 121 | ECM + coil power (J271 relay feed) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 2 | ECU ground | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 21 | ECM power (J271 relay feed) | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 27 | MAF sensor supply (G70) | — | — | — | — | — | — | — | — |
| 29 | MAF sensor ground (G70) | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | Ignition switch +12V (term 15) | — | W46 | — | 0.5 | MS3PROEVOHC-B-19 | — | — | — |
| 33 | Accelerator pedal position 1 (G79) | — | W49 | — | 0.5 | MS3PROEVOHC-A-9 | — | — | — |
| 34 | Accelerator pedal position 1 ground (G79) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 35 | Accelerator pedal position 2 (G185) | — | W51 | — | 0.5 | MS3PROEVOHC-A-22 | — | — | — |
| 36 | Accelerator pedal position 2 ground (G185) | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 37 | Engine speed signal (tacho to cluster) | — | W65 | — | 0.5 | MS3PROEVOHC-A-24 | — | — | — |
| 43 | K-line diagnostics (OBD pin 7) | — | — | — | — | — | — | — | — |
| 47 | Check engine light (MIL) | — | W61 | — | 0.5 | MS3PROEVOHC-C-1 | — | — | — |
| 48 | EPC warning light | — | W62 | — | 0.5 | MS3PROEVOHC-A-1 | — | — | — |
| 5 | Wideband lambda heater (Z19) | — | W56 | — | 0.5 | MS3PROEVOHC-C-4 | — | — | — |
| 51 | Wideband lambda pump (G39) | — | — | — | — | — | — | — | — |
| 52 | Wideband lambda pump (G39) | — | — | — | — | — | — | — | — |
| 53 | MAF sensor signal (G70) | — | W47 | — | 0.5 | MS3PROEVOHC-A-19 | — | — | — |
| 54 | Road speed signal (VSS) | — | W69 | — | 0.5 | MS3PROEVOHC-B-28 | — | — | — |
| 58 | CAN bus low | — | W71 | — | 0.5 | MS3PROEVOHC-A-33 | — | — | — |
| 60 | CAN bus high | — | W70 | — | 0.5 | MS3PROEVOHC-A-34 | — | — | — |
| 62 | Battery constant +12V (term 30) | — | — | — | — | — | — | — | — |
| 63 | Post-cat lambda heater (Z29) | — | W57 | — | 0.5 | MS3PROEVOHC-A-29 | — | — | — |
| 64 | EVAP canister valve (N80) | — | W63 | — | 0.5 | MS3PROEVOHC-A-2 | — | — | — |
| 65 | Fuel pump relay control | — | W54 | — | 0.5 | MS3PROEVOHC-A-28 | — | — | — |
| 66 | Secondary-air pump relay (J299) | — | W55 | — | 0.5 | MS3PROEVOHC-A-14 | — | — | — |
| 68 | Post-cat lambda signal (G130) | — | W66 | — | 0.5 | MS3PROEVOHC-A-25 | — | — | — |
| 69 | Post-cat lambda signal (G130) | — | W67 | — | 0.5 | MS3PROEVOHC-A-12 | — | — | — |
| 70 | Wideband lambda Nernst signal (G39) | — | — | — | — | — | — | — | — |
| 71 | Wideband lambda Nernst signal (G39) | — | — | — | — | — | — | — | — |
| 72 | Accelerator pedal position 1 5V supply (G79) | — | W23 | — | 0.5 | SP-5V1-1 | — | — | — |
| 73 | Accelerator pedal position 2 5V supply (G185) | — | W26 | — | 0.5 | SP-5V2-1 | — | — | — |
| 82 | Crank position sensor (G28) | — | W30 | — | 0.5 | MS3PROEVOHC-A-6 | — | — | — |
| 83 | Throttle position sensor 5V supply (G187/G188) | — | W29 | — | 0.5 | MS3PROEVOHC-C-22 | — | — | — |
| 84 | Throttle position sensor 1 (G187) | — | W50 | — | 0.5 | MS3PROEVOHC-A-21 | — | — | — |
| 85 | Intake air temperature (G42) | — | W68 | — | 0.5 | MS3PROEVOHC-A-10 | — | — | — |
| 86 | Camshaft position sensor (G40) | — | W32 | — | 0.5 | MS3PROEVOHC-A-26 | — | — | — |
| 88 | Injector 4 (N33) | — | W43 | — | 0.5 | MS3PROEVOHC-B-10 | — | — | — |
| 89 | Injector 2 (N31) | — | W41 | — | 0.5 | MS3PROEVOHC-A-4 | — | — | — |
| 9 | Secondary-air injection valve (N112) | — | W64 | — | 0.5 | MS3PROEVOHC-A-5 | — | — | — |
| 90 | Crank position sensor ground (G28) | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 91 | Throttle position sensor ground (G187/G188) | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 92 | Throttle position sensor 2 (G188) | — | W52 | — | 0.5 | MS3PROEVOHC-A-23 | — | — | — |
| 93 | Engine coolant temperature (G62) | — | W53 | — | 0.5 | MS3PROEVOHC-A-11 | — | — | — |
| 94 | Ignition coil 4 (N163) | — | W39 | — | 0.5 | MS3PROEVOHC-B-16 | — | — | — |
| 95 | Ignition coil 2 (N128) | — | W37 | — | 0.5 | MS3PROEVOHC-B-14 | — | — | — |
| 96 | Injector 1 (N30) | — | W40 | — | 0.5 | MS3PROEVOHC-A-3 | — | — | — |
| 97 | Injector 3 (N32) | — | W42 | — | 0.5 | MS3PROEVOHC-B-1 | — | — | — |
| 98 | Cam + boost sensor 5V supply (G40/G31) | — | W24 | — | 0.5 | SP-5V1-1 | — | — | — |
| 99 | Knock sensor 5V supply (G61/G66) | — | W27 | — | 0.5 | SP-5V2-1 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W10 | — | 0.5 | OEM-T121-108 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-T121-29 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-T121-34 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-T121-36 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-T121-90 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | OEM-T121-91 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | MS3PROEVOHC-A-13 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | MS3PROEVOHC-A-18 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | MS3PROEVOHC-C-17 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | MS3PROEVOHC-C-18 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | MS3PROEVOHC-C-19 | — | — | — |
| 1 | — | — | W21 | — | 0.5 | MS3PROEVOHC-C-20 | — | — | — |
| 1 | — | — | W22 | — | 0.5 | MS3PROEVOHC-C-21 | — | — | — |
| 1 | — | — | W31 | — | 0.5 | MS3PROEVOHC-A-15 | — | — | — |
| 1 | — | — | W33 | — | 0.5 | MS3PROEVOHC-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 | MS3PROEVOHC-A-35 | — | — | — |
SP-5V1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W23 | — | 0.5 | OEM-T121-72 | — | — | — |
| 1 | — | — | W24 | — | 0.5 | OEM-T121-98 | — | — | — |
| 1 | — | — | W25 | — | 0.5 | MS3PROEVOHC-A-8 | — | — | — |
SP-5V2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W26 | — | 0.5 | OEM-T121-73 | — | — | — |
| 1 | — | — | W27 | — | 0.5 | OEM-T121-99 | — | — | — |
| 1 | — | — | W28 | — | 0.5 | MS3PROEVOHC-C-15 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-T121-1 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-T121-2 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | MS3PROEVOHC-B-3 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | MS3PROEVOHC-B-5 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | MS3PROEVOHC-B-7 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | MS3PROEVOHC-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 | MS3PROEVOHC-B-3 + MS3PROEVOHC-B-5 + MS3PROEVOHC-B-7 + MS3PROEVOHC-B-9 | Ground + Ground + Ground + Ground | ground | corroborated | |
| OEM-T121-101 | Boost pressure sensor (G31) | analog_in | MS3PROEVOHC-A-20 | Analog in 2 | analog_in | corroborated | |
| OEM-T121-102 | Ignition coil 1 (N127) | ignition_out | MS3PROEVOHC-B-13 | Spark out G | ignition_out | corroborated | |
| OEM-T121-103 | Ignition coil 3 (N158) | ignition_out | MS3PROEVOHC-B-15 | Spark out C | ignition_out | corroborated | |
| OEM-T121-104 | Boost control solenoid (N75) | low_side_out | MS3PROEVOHC-C-3 | Digital out 2 | low_side_out | corroborated | |
| OEM-T121-105 | Diverter valve (N249) | low_side_out | MS3PROEVOHC-A-30 | PWM out 3 | low_side_out | corroborated | |
| OEM-T121-106 | Knock sensor 1 (G61) | knock_in | MS3PROEVOHC-A-31 | Knock in 1 | knock_in | corroborated | |
| OEM-T121-107 | Knock sensor 2 (G66) | knock_in | MS3PROEVOHC-A-7 | Knock In 2 | knock_in | corroborated | |
| OEM-T121-108 | Sensor ground | sensor_ground | MS3PROEVOHC-A-13 + MS3PROEVOHC-A-15 + MS3PROEVOHC-A-18 + MS3PROEVOHC-A-27 + MS3PROEVOHC-C-17 + MS3PROEVOHC-C-18 + MS3PROEVOHC-C-19 + MS3PROEVOHC-C-20 + MS3PROEVOHC-C-21 | Logic Ground + CKP− + 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 | MS3PROEVOHC-C-2 | PWM out 4 | low_side_out | corroborated | |
| OEM-T121-117 | Throttle motor G186 (+) | hbridge_out | MS3PROEVOHC-B-30 | Stepper IAC out 1B | hbridge_out | corroborated | |
| OEM-T121-118 | Throttle motor G186 (−) | hbridge_out | MS3PROEVOHC-B-31 | Stepper IAC out 1A | hbridge_out | corroborated | |
| OEM-T121-121 | ECM + coil power (J271 relay feed) | power_in | MS3PROEVOHC-A-35 | 12V+ switched power in | power_in | corroborated | |
| OEM-T121-2 | ECU ground | ground | MS3PROEVOHC-B-3 + MS3PROEVOHC-B-5 + MS3PROEVOHC-B-7 + MS3PROEVOHC-B-9 | Ground + Ground + Ground + Ground | ground | corroborated | |
| OEM-T121-21 | ECM power (J271 relay feed) | power_in | MS3PROEVOHC-A-35 | 12V+ switched power in | power_in | corroborated | |
| OEM-T121-27 | MAF sensor supply (G70) | power_in | — | — | — | corroborated | |
| OEM-T121-29 | MAF sensor ground (G70) | sensor_ground | MS3PROEVOHC-A-13 + MS3PROEVOHC-A-15 + MS3PROEVOHC-A-18 + MS3PROEVOHC-A-27 + MS3PROEVOHC-C-17 + MS3PROEVOHC-C-18 + MS3PROEVOHC-C-19 + MS3PROEVOHC-C-20 + MS3PROEVOHC-C-21 | Logic Ground + CKP− + 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 | MS3PROEVOHC-B-19 | Digital switched 12V in | digital_in | corroborated | |
| OEM-T121-33 | Accelerator pedal position 1 (G79) | analog_in | MS3PROEVOHC-A-9 | TPS in | analog_in | corroborated | |
| OEM-T121-34 | Accelerator pedal position 1 ground (G79) | sensor_ground | MS3PROEVOHC-A-13 + MS3PROEVOHC-A-15 + MS3PROEVOHC-A-18 + MS3PROEVOHC-A-27 + MS3PROEVOHC-C-17 + MS3PROEVOHC-C-18 + MS3PROEVOHC-C-19 + MS3PROEVOHC-C-20 + MS3PROEVOHC-C-21 | Logic Ground + CKP− + 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 | MS3PROEVOHC-A-22 | Analog In 4 | analog_in | corroborated | |
| OEM-T121-36 | Accelerator pedal position 2 ground (G185) | sensor_ground | MS3PROEVOHC-A-13 + MS3PROEVOHC-A-15 + MS3PROEVOHC-A-18 + MS3PROEVOHC-A-27 + MS3PROEVOHC-C-17 + MS3PROEVOHC-C-18 + MS3PROEVOHC-C-19 + MS3PROEVOHC-C-20 + MS3PROEVOHC-C-21 | Logic Ground + CKP− + 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 | MS3PROEVOHC-A-24 | Tach out | tacho_out | corroborated | |
| OEM-T121-43 | K-line diagnostics (OBD pin 7) | serial | — | — | — | corroborated | |
| OEM-T121-47 | Check engine light (MIL) | low_side_out | MS3PROEVOHC-C-1 | PWM out 5 | low_side_out | corroborated | |
| OEM-T121-48 | EPC warning light | low_side_out | MS3PROEVOHC-A-1 | High current out 1 | low_side_out | corroborated | |
| OEM-T121-5 | Wideband lambda heater (Z19) | low_side_out | MS3PROEVOHC-C-4 | Digital out 1 | low_side_out | corroborated | |
| 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 | MS3PROEVOHC-A-19 | Analog in 1 | analog_in | corroborated | |
| OEM-T121-54 | Road speed signal (VSS) | digital_in | MS3PROEVOHC-B-28 | Digital frequency in 1 (unconditioned) | digital_in | corroborated | |
| OEM-T121-58 | CAN bus low | can_l | MS3PROEVOHC-A-33 | CAN L | can_l | corroborated | |
| OEM-T121-60 | CAN bus high | can_h | MS3PROEVOHC-A-34 | CAN H | can_h | corroborated | |
| OEM-T121-62 | Battery constant +12V (term 30) | power_in | — | — | — | corroborated | |
| OEM-T121-63 | Post-cat lambda heater (Z29) | low_side_out | MS3PROEVOHC-A-29 | PWM out 2 | low_side_out | corroborated | |
| OEM-T121-64 | EVAP canister valve (N80) | low_side_out | MS3PROEVOHC-A-2 | High current out 2 | low_side_out | corroborated | |
| OEM-T121-65 | Fuel pump relay control | low_side_out | MS3PROEVOHC-A-28 | Fuel pump relay out | low_side_out | corroborated | |
| OEM-T121-66 | Secondary-air pump relay (J299) | low_side_out | MS3PROEVOHC-A-14 | PWM / Idle Out 1 | low_side_out | corroborated | |
| OEM-T121-68 | Post-cat lambda signal (G130) | lambda_nb_in | MS3PROEVOHC-A-25 | O2 in | lambda_nb_in | corroborated | |
| OEM-T121-69 | Post-cat lambda signal (G130) | lambda_nb_in | MS3PROEVOHC-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 | MS3PROEVOHC-A-8 | 5V+ VREF out | vref | corroborated | |
| OEM-T121-73 | Accelerator pedal position 2 5V supply (G185) | vref | MS3PROEVOHC-C-15 | 5V+ VREF out 2 | vref | corroborated | |
| OEM-T121-82 | Crank position sensor (G28) | trigger_in | MS3PROEVOHC-A-6 | CKP+ | trigger_in | corroborated | |
| OEM-T121-83 | Throttle position sensor 5V supply (G187/G188) | vref | MS3PROEVOHC-C-22 | 5V+ VREF out 1 | vref | corroborated | |
| OEM-T121-84 | Throttle position sensor 1 (G187) | analog_in | MS3PROEVOHC-A-21 | Analog in 3 | analog_in | corroborated | |
| OEM-T121-85 | Intake air temperature (G42) | temp_in | MS3PROEVOHC-A-10 | MAT in | temp_in | corroborated | |
| OEM-T121-86 | Camshaft position sensor (G40) | trigger_in | MS3PROEVOHC-A-26 | CMP+ | trigger_in | corroborated | |
| OEM-T121-88 | Injector 4 (N33) | injector_out | MS3PROEVOHC-B-10 | Injector out F | injector_out | corroborated | |
| OEM-T121-89 | Injector 2 (N31) | injector_out | MS3PROEVOHC-A-4 | Injector out I | injector_out | corroborated | |
| OEM-T121-9 | Secondary-air injection valve (N112) | low_side_out | MS3PROEVOHC-A-5 | High current out 3 | low_side_out | corroborated | |
| OEM-T121-90 | Crank position sensor ground (G28) | sensor_ground | MS3PROEVOHC-A-13 + MS3PROEVOHC-A-15 + MS3PROEVOHC-A-18 + MS3PROEVOHC-A-27 + MS3PROEVOHC-C-17 + MS3PROEVOHC-C-18 + MS3PROEVOHC-C-19 + MS3PROEVOHC-C-20 + MS3PROEVOHC-C-21 | Logic Ground + CKP− + 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 | MS3PROEVOHC-A-13 + MS3PROEVOHC-A-15 + MS3PROEVOHC-A-18 + MS3PROEVOHC-A-27 + MS3PROEVOHC-C-17 + MS3PROEVOHC-C-18 + MS3PROEVOHC-C-19 + MS3PROEVOHC-C-20 + MS3PROEVOHC-C-21 | Logic Ground + CKP− + 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 | MS3PROEVOHC-A-23 | Analog In 5 | analog_in | corroborated | |
| OEM-T121-93 | Engine coolant temperature (G62) | temp_in | MS3PROEVOHC-A-11 | CLT in | temp_in | corroborated | |
| OEM-T121-94 | Ignition coil 4 (N163) | ignition_out | MS3PROEVOHC-B-16 | Spark out H | ignition_out | corroborated | |
| OEM-T121-95 | Ignition coil 2 (N128) | ignition_out | MS3PROEVOHC-B-14 | Spark out E | ignition_out | corroborated | |
| OEM-T121-96 | Injector 1 (N30) | injector_out | MS3PROEVOHC-A-3 | Injector out J | injector_out | corroborated | |
| OEM-T121-97 | Injector 3 (N32) | injector_out | MS3PROEVOHC-B-1 | Injector out A | injector_out | corroborated | |
| OEM-T121-98 | Cam + boost sensor 5V supply (G40/G31) | vref | MS3PROEVOHC-A-8 | 5V+ VREF out | vref | corroborated | |
| OEM-T121-99 | Knock sensor 5V supply (G61/G66) | vref | MS3PROEVOHC-C-15 | 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 | MS3PROEVOHC-A-35 | 0.85 | no route | 12V+ switched power in | — | |
| W4 | OEM-T121-1 | SP-GND-1 | 0.85 | no route | ECU ground | — | |
| W5 | OEM-T121-2 | SP-GND-1 | 0.85 | no route | ECU ground | — | |
| W6 | SP-GND-1 | MS3PROEVOHC-B-3 | 0.85 | no route | Ground | — | |
| W7 | SP-GND-1 | MS3PROEVOHC-B-5 | 0.85 | no route | Ground | — | |
| W8 | SP-GND-1 | MS3PROEVOHC-B-7 | 0.85 | no route | Ground | — | |
| W9 | SP-GND-1 | MS3PROEVOHC-B-9 | 0.85 | no route | Ground | — | |
| W10 | OEM-T121-108 | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W11 | OEM-T121-29 | SP-0V-1 | 0.5 | no route | MAF sensor ground (G70) | — | |
| W12 | OEM-T121-34 | SP-0V-1 | 0.5 | no route | Accelerator pedal position 1 ground (G79) | — | |
| W13 | OEM-T121-36 | SP-0V-1 | 0.5 | no route | Accelerator pedal position 2 ground (G185) | — | |
| W14 | OEM-T121-90 | SP-0V-1 | 0.5 | no route | Crank position sensor ground (G28) | — | |
| W15 | OEM-T121-91 | SP-0V-1 | 0.5 | no route | Throttle position sensor ground (G187/G188) | — | |
| W16 | SP-0V-1 | MS3PROEVOHC-A-13 | 0.5 | no route | Logic Ground | — | |
| W17 | SP-0V-1 | MS3PROEVOHC-A-18 | 0.5 | no route | Sensor return | — | |
| W18 | SP-0V-1 | MS3PROEVOHC-C-17 | 0.5 | no route | Sensor return | — | |
| W19 | SP-0V-1 | MS3PROEVOHC-C-18 | 0.5 | no route | Sensor return | — | |
| W20 | SP-0V-1 | MS3PROEVOHC-C-19 | 0.5 | no route | Sensor return | — | |
| W21 | SP-0V-1 | MS3PROEVOHC-C-20 | 0.5 | no route | Sensor return | — | |
| W22 | SP-0V-1 | MS3PROEVOHC-C-21 | 0.5 | no route | Sensor return | — | |
| W23 | OEM-T121-72 | SP-5V1-1 | 0.5 | no route | Accelerator pedal position 1 5V supply (G79) | — | |
| W24 | OEM-T121-98 | SP-5V1-1 | 0.5 | no route | Cam + boost sensor 5V supply (G40/G31) | — | |
| W25 | SP-5V1-1 | MS3PROEVOHC-A-8 | 0.5 | no route | 5V+ VREF out | — | |
| W26 | OEM-T121-73 | SP-5V2-1 | 0.5 | no route | Accelerator pedal position 2 5V supply (G185) | — | |
| W27 | OEM-T121-99 | SP-5V2-1 | 0.5 | no route | Knock sensor 5V supply (G61/G66) | — | |
| W28 | SP-5V2-1 | MS3PROEVOHC-C-15 | 0.5 | no route | 5V+ VREF out 2 | — | |
| W29 | OEM-T121-83 | MS3PROEVOHC-C-22 | 0.5 | no route | Throttle position sensor 5V supply (G187/G188) | — | |
| W30 | OEM-T121-82 | MS3PROEVOHC-A-6 | 0.5 | no route | Crank position sensor (G28) | — | |
| W31 | SP-0V-1 | MS3PROEVOHC-A-15 | 0.5 | no route | CKP− | — | |
| W32 | OEM-T121-86 | MS3PROEVOHC-A-26 | 0.5 | no route | Camshaft position sensor (G40) | — | |
| W33 | SP-0V-1 | MS3PROEVOHC-A-27 | 0.5 | no route | CMP− | — | |
| W34 | OEM-T121-106 | MS3PROEVOHC-A-31 | 0.5 | no route | Knock sensor 1 (G61) | — | |
| W35 | OEM-T121-107 | MS3PROEVOHC-A-7 | 0.5 | no route | Knock sensor 2 (G66) | — | |
| W36 | OEM-T121-102 | MS3PROEVOHC-B-13 | 0.5 | no route | Ignition coil 1 (N127) | — | |
| W37 | OEM-T121-95 | MS3PROEVOHC-B-14 | 0.5 | no route | Ignition coil 2 (N128) | — | |
| W38 | OEM-T121-103 | MS3PROEVOHC-B-15 | 0.5 | no route | Ignition coil 3 (N158) | — | |
| W39 | OEM-T121-94 | MS3PROEVOHC-B-16 | 0.5 | no route | Ignition coil 4 (N163) | — | |
| W40 | OEM-T121-96 | MS3PROEVOHC-A-3 | 0.5 | no route | Injector 1 (N30) | — | |
| W41 | OEM-T121-89 | MS3PROEVOHC-A-4 | 0.5 | no route | Injector 2 (N31) | — | |
| W42 | OEM-T121-97 | MS3PROEVOHC-B-1 | 0.5 | no route | Injector 3 (N32) | — | |
| W43 | OEM-T121-88 | MS3PROEVOHC-B-10 | 0.5 | no route | Injector 4 (N33) | — | |
| W44 | OEM-T121-118 | MS3PROEVOHC-B-31 | 0.5 | no route | Throttle motor G186 (−) | — | |
| W45 | OEM-T121-117 | MS3PROEVOHC-B-30 | 0.5 | no route | Throttle motor G186 (+) | — | |
| W46 | OEM-T121-3 | MS3PROEVOHC-B-19 | 0.5 | no route | Ignition switch +12V (term 15) | — | |
| W47 | OEM-T121-53 | MS3PROEVOHC-A-19 | 0.5 | no route | MAF sensor signal (G70) | — | |
| W48 | OEM-T121-101 | MS3PROEVOHC-A-20 | 0.5 | no route | Boost pressure sensor (G31) | — | |
| W49 | OEM-T121-33 | MS3PROEVOHC-A-9 | 0.5 | no route | Accelerator pedal position 1 (G79) | — | |
| W50 | OEM-T121-84 | MS3PROEVOHC-A-21 | 0.5 | no route | Throttle position sensor 1 (G187) | — | |
| W51 | OEM-T121-35 | MS3PROEVOHC-A-22 | 0.5 | no route | Accelerator pedal position 2 (G185) | — | |
| W52 | OEM-T121-92 | MS3PROEVOHC-A-23 | 0.5 | no route | Throttle position sensor 2 (G188) | — | |
| W53 | OEM-T121-93 | MS3PROEVOHC-A-11 | 0.5 | no route | Engine coolant temperature (G62) | — | |
| W54 | OEM-T121-65 | MS3PROEVOHC-A-28 | 0.5 | no route | Fuel pump relay control | — | |
| W55 | OEM-T121-66 | MS3PROEVOHC-A-14 | 0.5 | no route | Secondary-air pump relay (J299) | — | |
| W56 | OEM-T121-5 | MS3PROEVOHC-C-4 | 0.5 | no route | Wideband lambda heater (Z19) | — | |
| W57 | OEM-T121-63 | MS3PROEVOHC-A-29 | 0.5 | no route | Post-cat lambda heater (Z29) | — | |
| W58 | OEM-T121-104 | MS3PROEVOHC-C-3 | 0.5 | no route | Boost control solenoid (N75) | — | |
| W59 | OEM-T121-105 | MS3PROEVOHC-A-30 | 0.5 | no route | Diverter valve (N249) | — | |
| W60 | OEM-T121-115 | MS3PROEVOHC-C-2 | 0.5 | no route | VVT camshaft adjustment valve (N205) | — | |
| W61 | OEM-T121-47 | MS3PROEVOHC-C-1 | 0.5 | no route | Check engine light (MIL) | — | |
| W62 | OEM-T121-48 | MS3PROEVOHC-A-1 | 0.5 | no route | EPC warning light | — | |
| W63 | OEM-T121-64 | MS3PROEVOHC-A-2 | 0.5 | no route | EVAP canister valve (N80) | — | |
| W64 | OEM-T121-9 | MS3PROEVOHC-A-5 | 0.5 | no route | Secondary-air injection valve (N112) | — | |
| W65 | OEM-T121-37 | MS3PROEVOHC-A-24 | 0.5 | no route | Engine speed signal (tacho to cluster) | — | |
| W66 | OEM-T121-68 | MS3PROEVOHC-A-25 | 0.5 | no route | Post-cat lambda signal (G130) | — | |
| W67 | OEM-T121-69 | MS3PROEVOHC-A-12 | 0.5 | no route | Post-cat lambda signal (G130) | — | |
| W68 | OEM-T121-85 | MS3PROEVOHC-A-10 | 0.5 | no route | Intake air temperature (G42) | — | |
| W69 | OEM-T121-54 | MS3PROEVOHC-B-28 | 0.5 | no route | Road speed signal (VSS) | — | |
| W70 | OEM-T121-60 | MS3PROEVOHC-A-34 | 0.5 | no route | CAN bus high | — | |
| W71 | OEM-T121-58 | MS3PROEVOHC-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 (8)
| Severity | Code | Subject | Message |
|---|---|---|---|
| warn | DBW_MOTOR_CURRENT | MS3PROEVOHC-B-30 | Cannot confirm MS3Pro EVO+ HC can drive the throttle motor: MS3PROEVOHC-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 | MS3PROEVOHC-B-31 | Cannot confirm MS3Pro EVO+ HC can drive the throttle motor: MS3PROEVOHC-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 | MS3PROEVOHC-A-8 + OEM-T121-72 + OEM-T121-98 + SP-5V1-1 | These 5 V supplies are separate in the stock car (OEM-T121-72 [pedal1], OEM-T121-98 [cam_boost]) and here share one ECU 5 V (MS3PROEVOHC-A-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 EVO+ HC has 3 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 | DBW_SHARED_5V | MS3PROEVOHC-C-15 + OEM-T121-73 + OEM-T121-99 + SP-5V2-1 | These 5 V supplies are separate in the stock car (OEM-T121-73 [pedal2], OEM-T121-99 [knock]) and here share one ECU 5 V (MS3PROEVOHC-C-15). 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 EVO+ HC has 3 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 | SUPPLY_GROUP | MS3PROEVOHC-A-8 + OEM-T121-72 + OEM-T121-98 + SP-5V1-1 | Supplies meant to stay independent share one net: OEM-T121-72 [pedal1], OEM-T121-98 [cam_boost]. 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. |
| warn | SUPPLY_GROUP | MS3PROEVOHC-C-15 + OEM-T121-73 + OEM-T121-99 + SP-5V2-1 | Supplies meant to stay independent share one net: OEM-T121-73 [pedal2], 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 | OEM-T121-29 ↔ MS3PROEVOHC-A-15 | OEM-T121-29 "MAF sensor ground (G70)" [sensor_ground] is wired to MS3PROEVOHC-A-15 "CKP−" [trigger_in]. Trigger return tied to sensor/trigger ground: correct for single-ended trigger inputs. |
| info | UNMAPPED | OEM | 6 optional OEM pins are not mapped: OEM-T121-27 MAF sensor supply (G70); OEM-T121-43 K-line diagnostics (OBD pin 7); 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 (1)
| Code | Subject | Reason | By |
|---|---|---|---|
| REQUIRED_UNMAPPED | OEM-T121-62 | Battery-constant (memory) feed of the stock ECU: the new ECU has no such input, so it is not needed. | mapping-proposal |
Notes
Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Not wired: - OEM-T121 62: Battery constant +12V (term 30): AMP EFI MS3Pro EVO+ HC has no battery-constant input; not needed - OEM-T121 51: Wideband lambda pump (G39): no free wb_ip on AMP EFI MS3Pro EVO+ HC - OEM-T121 52: Wideband lambda pump (G39): no free wb_ip on AMP EFI MS3Pro EVO+ HC - OEM-T121 70: Wideband lambda Nernst signal (G39): no free wb_vs on AMP EFI MS3Pro EVO+ HC - OEM-T121 71: Wideband lambda Nernst signal (G39): no free wb_vs on AMP EFI MS3Pro EVO+ HC - OEM-T121 43: K-line diagnostics (OBD pin 7): no free k_line on AMP EFI MS3Pro EVO+ HC - OEM-T121 27: MAF sensor supply (G70): 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 EVO+ / EVO+ HC manual (fw 1.6.1) pinout tables | https://cdn.shopify.com/s/files/1/0960/0014/7754/files/MS3Pro_User_Manual_Firmware_1.6.1_EVO.pdf?v=1760643022 | archive | 2026-10-05 | d5dd8a31822d |
| 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 | — | — | — |