VW Golf Mk4 1.8T 20v (AUM, Bosch ME7.5) DBW → MaxxECU MaxxECU PRO REV10+ (auto)
VW Golf Mk4 1.8T 20v (AUM, Bosch ME7.5) DBW — MaxxECU — MaxxECU PRO
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 | 72 wires · 10 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 | MAXXECUPRO-C1-M4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | SP-14V-1 | MAXXECUPRO-C3-M4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-T121-1 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-T121-2 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | SP-GND-1 | MAXXECUPRO-C1-L4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | MAXXECUPRO-C2-H1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | MAXXECUPRO-C2-H2 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | SP-GND-1 | MAXXECUPRO-C2-H3 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | SP-GND-1 | MAXXECUPRO-C3-L4 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-T121-108 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-T121-29 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-T121-34 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | OEM-T121-36 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | OEM-T121-90 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-T121-91 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | SP-0V-1 | MAXXECUPRO-C1-H1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | SP-0V-1 | MAXXECUPRO-C1-H2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | SP-0V-1 | MAXXECUPRO-C3-J2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | SP-0V-1 | MAXXECUPRO-C3-J3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-T121-72 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-T121-98 | SP-5V1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | SP-5V1-1 | MAXXECUPRO-C1-G1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-T121-73 | SP-5V2-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-T121-99 | SP-5V2-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | SP-5V2-1 | MAXXECUPRO-C3-C2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-T121-83 | MAXXECUPRO-C4-E3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-T121-82 | MAXXECUPRO-C1-H3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-T121-86 | MAXXECUPRO-C1-H4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-T121-106 | MAXXECUPRO-C4-F2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-T121-107 | MAXXECUPRO-C4-F3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-T121-102 | MAXXECUPRO-C1-A2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-T121-95 | MAXXECUPRO-C1-A3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-T121-103 | MAXXECUPRO-C1-B2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-T121-94 | MAXXECUPRO-C1-B3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-T121-96 | MAXXECUPRO-C1-K1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-T121-89 | MAXXECUPRO-C1-K2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-T121-97 | MAXXECUPRO-C1-M1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-T121-88 | MAXXECUPRO-C1-M2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-T121-118 | MAXXECUPRO-C3-L2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-T121-117 | MAXXECUPRO-C3-L3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-T121-3 | MAXXECUPRO-C3-K3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-T121-53 | MAXXECUPRO-C1-J3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W45 | OEM-T121-101 | MAXXECUPRO-C1-J4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W46 | OEM-T121-33 | MAXXECUPRO-C1-G2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W47 | OEM-T121-84 | MAXXECUPRO-C3-C3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W48 | OEM-T121-35 | MAXXECUPRO-C3-D1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W49 | OEM-T121-92 | MAXXECUPRO-C3-D2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W50 | OEM-T121-93 | MAXXECUPRO-C1-F1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W51 | OEM-T121-65 | MAXXECUPRO-C1-B4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W52 | OEM-T121-66 | MAXXECUPRO-C1-C4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W53 | OEM-T121-5 | MAXXECUPRO-C1-D1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W54 | OEM-T121-63 | MAXXECUPRO-C3-E1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W55 | OEM-T121-104 | MAXXECUPRO-C1-D4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W56 | OEM-T121-105 | MAXXECUPRO-C1-E4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W57 | OEM-T121-115 | MAXXECUPRO-C1-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W58 | OEM-T121-47 | MAXXECUPRO-C1-B1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W59 | OEM-T121-48 | MAXXECUPRO-C1-C1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W60 | OEM-T121-64 | MAXXECUPRO-C1-A4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W61 | OEM-T121-9 | MAXXECUPRO-C4-G1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W62 | OEM-T121-37 | MAXXECUPRO-C4-G2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W63 | OEM-T121-51 | MAXXECUPRO-C1-G3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W64 | OEM-T121-52 | MAXXECUPRO-C3-B2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W65 | OEM-T121-70 | MAXXECUPRO-C1-F4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W66 | OEM-T121-71 | MAXXECUPRO-C3-B3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W67 | OEM-T121-68 | MAXXECUPRO-C3-D3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W68 | OEM-T121-69 | MAXXECUPRO-C3-E2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W69 | OEM-T121-85 | MAXXECUPRO-C1-F2 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W70 | OEM-T121-54 | MAXXECUPRO-C1-K3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W71 | OEM-T121-60 | MAXXECUPRO-C4-A1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W72 | OEM-T121-58 | MAXXECUPRO-C4-A2 | 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 | MAXXECUPRO-C1-H1 | MAXXECUPRO-C1-G1 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 2 | MAXXECUPRO-C1-H1 | MAXXECUPRO-C1-M4 | open (OL) | sensor ground must not touch +12 V supply | |
| 3 | MAXXECUPRO-C1-H1 | MAXXECUPRO-C3-C2 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 4 | MAXXECUPRO-C1-H1 | MAXXECUPRO-C4-E3 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 5 | MAXXECUPRO-C1-L4 | MAXXECUPRO-C1-G1 | open (OL) | power ground must not touch 5 V sensor reference | |
| 6 | MAXXECUPRO-C1-L4 | MAXXECUPRO-C1-M4 | open (OL) | power ground must not touch +12 V supply | |
| 7 | MAXXECUPRO-C1-L4 | MAXXECUPRO-C3-C2 | open (OL) | power ground must not touch 5 V sensor reference | |
| 8 | MAXXECUPRO-C1-L4 | MAXXECUPRO-C4-E3 | open (OL) | power ground must not touch 5 V sensor reference | |
| 9 | MAXXECUPRO-C1-M4 | MAXXECUPRO-C1-G1 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 10 | MAXXECUPRO-C1-M4 | MAXXECUPRO-C3-C2 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 11 | MAXXECUPRO-C1-M4 | MAXXECUPRO-C4-E3 | 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
MAXXECUPRO-C1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | GPO 5 | — | W57 | — | 0.5 | OEM-T121-115 | — | — | — |
| A2 | IGN 1 | — | W33 | — | 0.5 | OEM-T121-102 | — | — | — |
| A3 | IGN 2 | — | W34 | — | 0.5 | OEM-T121-95 | — | — | — |
| A4 | GPO 8/TACHO | — | W60 | — | 0.5 | OEM-T121-64 | — | — | — |
| B1 | GPO 6 | — | W58 | — | 0.5 | OEM-T121-47 | — | — | — |
| B2 | IGN 3 | — | W35 | — | 0.5 | OEM-T121-103 | — | — | — |
| B3 | IGN 4 | — | W36 | — | 0.5 | OEM-T121-94 | — | — | — |
| B4 | GPO 1 | — | W51 | — | 0.5 | OEM-T121-65 | — | — | — |
| C1 | GPO 7 | — | W59 | — | 0.5 | OEM-T121-48 | — | — | — |
| C2 | IGN 5 | — | — | — | — | — | — | — | — |
| C3 | IGN 6 | — | — | — | — | — | — | — | — |
| C4 | GPO 2 | — | W52 | — | 0.5 | OEM-T121-66 | — | — | — |
| D1 | WBO2 Heater- | — | W53 | — | 0.5 | OEM-T121-5 | — | — | — |
| D2 | IGN 7 | — | — | — | — | — | — | — | — |
| D3 | IGN 8 | — | — | — | — | — | — | — | — |
| D4 | GPO 3 | — | W55 | — | 0.5 | OEM-T121-104 | — | — | — |
| E1 | CAN H | — | — | — | — | — | — | — | — |
| E2 | CAN L | — | — | — | — | — | — | — | — |
| E3 | GND Shield | — | — | — | — | — | — | — | — |
| E4 | GPO 4 | — | W56 | — | 0.5 | OEM-T121-105 | — | — | — |
| F1 | CLT | — | W50 | — | 0.5 | OEM-T121-93 | — | — | — |
| F2 | IAT | — | W69 | — | 0.5 | OEM-T121-85 | — | — | — |
| F3 | WBO2 VREF | — | — | — | — | — | — | — | — |
| F4 | WBO2 VS | — | W65 | — | 0.5 | OEM-T121-70 | — | — | — |
| G1 | +5V sensor supply | — | W24 | — | 0.5 | SP-5V1-1 | — | — | — |
| G2 | TPS/AIN | — | W46 | — | 0.5 | OEM-T121-33 | — | — | — |
| G3 | WBO2 IP | — | W63 | — | 0.5 | OEM-T121-51 | — | — | — |
| G4 | WBO2 RCAL | — | — | — | — | — | — | — | — |
| H1 | Sensor GND | — | W18 | — | 0.5 | SP-0V-1 | — | — | — |
| H2 | Trigger GND | — | W19 | — | 0.5 | SP-0V-1 | — | — | — |
| H3 | TRIGGER | — | W29 | — | 0.5 | OEM-T121-82 | — | — | — |
| H4 | HOME | — | W30 | — | 0.5 | OEM-T121-86 | — | — | — |
| J1 | AIN 1 (temperature) | — | — | — | — | — | — | — | — |
| J2 | AIN 2 (temperature) | — | — | — | — | — | — | — | — |
| J3 | AIN 3 (0-5V) | — | W44 | — | 0.5 | OEM-T121-53 | — | — | — |
| J4 | AIN 4 (0-5V) | — | W45 | — | 0.5 | OEM-T121-101 | — | — | — |
| K1 | INJ 1 | — | W37 | — | 0.5 | OEM-T121-96 | — | — | — |
| K2 | INJ 2 | — | W38 | — | 0.5 | OEM-T121-89 | — | — | — |
| K3 | DIN/VR 1 | — | W70 | — | 0.5 | OEM-T121-54 | — | — | — |
| K4 | DIN/VR 2 | — | — | — | — | — | — | — | — |
| L1 | INJ 8 | — | — | — | — | — | — | — | — |
| L2 | INJ 7 | — | — | — | — | — | — | — | — |
| L3 | INJ 6 | — | — | — | — | — | — | — | — |
| L4 | Engine GND | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| M1 | INJ 3 | — | W39 | — | 0.5 | OEM-T121-97 | — | — | — |
| M2 | INJ 4 | — | W40 | — | 0.5 | OEM-T121-88 | — | — | — |
| M3 | INJ 5 | — | — | — | — | — | — | — | — |
| M4 | +12V ECU power supply | — | W3 | — | 0.85 | SP-14V-1 | — | — | — |
MAXXECUPRO-C2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | EGT 1+ | — | — | — | — | — | — | — | — |
| A2 | EGT 2+ | — | — | — | — | — | — | — | — |
| A3 | EGT 3+ | — | — | — | — | — | — | — | — |
| A4 | EGT 4+ | — | — | — | — | — | — | — | — |
| B1 | EGT 1- | — | — | — | — | — | — | — | — |
| B2 | EGT 2- | — | — | — | — | — | — | — | — |
| B3 | EGT 3- | — | — | — | — | — | — | — | — |
| B4 | EGT 4- | — | — | — | — | — | — | — | — |
| C1 | EGT 5+ | — | — | — | — | — | — | — | — |
| C2 | EGT 6+ | — | — | — | — | — | — | — | — |
| C3 | EGT 7+ | — | — | — | — | — | — | — | — |
| C4 | EGT 8+ | — | — | — | — | — | — | — | — |
| D1 | EGT 5- | — | — | — | — | — | — | — | — |
| D2 | EGT 6- | — | — | — | — | — | — | — | — |
| D3 | EGT 7- | — | — | — | — | — | — | — | — |
| D4 | EGT 8- | — | — | — | — | — | — | — | — |
| E1 | EGT 9+ | — | — | — | — | — | — | — | — |
| E2 | EGT 10+ | — | — | — | — | — | — | — | — |
| E3 | EGT 11+ | — | — | — | — | — | — | — | — |
| E4 | EGT 12+ | — | — | — | — | — | — | — | — |
| F1 | EGT 9- | — | — | — | — | — | — | — | — |
| F2 | EGT 10- | — | — | — | — | — | — | — | — |
| F3 | EGT 11- | — | — | — | — | — | — | — | — |
| F4 | EGT 12- | — | — | — | — | — | — | — | — |
| H1 | Engine ground 3 | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| H2 | Engine ground 3 | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| H3 | Engine ground 3 | — | W10 | — | 0.85 | SP-GND-1 | — | — | — |
MAXXECUPRO-C3
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | DIN/VR 4 | — | — | — | — | — | — | — | — |
| A2 | DIN/VR 5 | — | — | — | — | — | — | — | — |
| A3 | DIN 6 (SWITCH) | — | — | — | — | — | — | — | — |
| A4 | DIN 7 (SWITCH) | — | — | — | — | — | — | — | — |
| B1 | WBO2 2 RCAL | — | — | — | — | — | — | — | — |
| B2 | WBO2 2 IP | — | W64 | — | 0.5 | OEM-T121-52 | — | — | — |
| B3 | WBO2 2 VS | — | W66 | — | 0.5 | OEM-T121-71 | — | — | — |
| B4 | WBO2 2 COM | — | — | — | — | — | — | — | — |
| C1 | WBO2 2 Shield | — | — | — | — | — | — | — | — |
| C2 | +5V SENSOR SUPPLY 2 | — | W27 | — | 0.5 | SP-5V2-1 | — | — | — |
| C3 | ANALOG IN 5 (0-5V) | — | W47 | — | 0.5 | OEM-T121-84 | — | — | — |
| C4 | GPO 19 (12V) | — | — | — | — | — | — | — | — |
| D1 | ANALOG IN 6 (0-5V) | — | W48 | — | 0.5 | OEM-T121-35 | — | — | — |
| D2 | ANALOG IN 7 (0-5V) | — | W49 | — | 0.5 | OEM-T121-92 | — | — | — |
| D3 | ANALOG IN 8 (0-5V) | — | W67 | — | 0.5 | OEM-T121-68 | — | — | — |
| D4 | GPO 20 (12V) | — | — | — | — | — | — | — | — |
| E1 | GPO 10/WBO2 2 HTR | — | W54 | — | 0.5 | OEM-T121-63 | — | — | — |
| E2 | ANALOG IN 9 (0-5V) | — | W68 | — | 0.5 | OEM-T121-69 | — | — | — |
| E3 | ANALOG IN 10 (0-5V) | — | — | — | — | — | — | — | — |
| E4 | GPO 21 (12V) | — | — | — | — | — | — | — | — |
| F1 | INJECTOR OUT 15 | — | — | — | — | — | — | — | — |
| F2 | ANALOG IN 11 (0-5V) | — | — | — | — | — | — | — | — |
| F3 | ANALOG IN 12 (0-5V) | — | — | — | — | — | — | — | — |
| F4 | GPO 22 (12V) | — | — | — | — | — | — | — | — |
| G1 | INJECTOR OUT 14 | — | — | — | — | — | — | — | — |
| G2 | IGNITION OUT 11 | — | — | — | — | — | — | — | — |
| G3 | IGNITION OUT 9 | — | — | — | — | — | — | — | — |
| G4 | GPO 15 (12V) | — | — | — | — | — | — | — | — |
| H1 | INJECTOR OUT 13 | — | — | — | — | — | — | — | — |
| H2 | IGNITION OUT 12 | — | — | — | — | — | — | — | — |
| H3 | IGNITION OUT 10 | — | — | — | — | — | — | — | — |
| H4 | GPO 16 (12V) | — | — | — | — | — | — | — | — |
| J1 | INJECTOR OUT 16 | — | — | — | — | — | — | — | — |
| J2 | SENSOR GND | — | W20 | — | 0.5 | SP-0V-1 | — | — | — |
| J3 | SENSOR GND | — | W21 | — | 0.5 | SP-0V-1 | — | — | — |
| J4 | GPO 17 (12V) | — | — | — | — | — | — | — | — |
| K1 | INJECTOR OUT 10 | — | — | — | — | — | — | — | — |
| K2 | INJECTOR OUT 9 | — | — | — | — | — | — | — | — |
| K3 | KEY IN 12V | — | W43 | — | 0.5 | OEM-T121-3 | — | — | — |
| K4 | GPO 18 (12V) | — | — | — | — | — | — | — | — |
| L1 | INJECTOR OUT 11 | — | — | — | — | — | — | — | — |
| L2 | GPO 12/MOTOR 1 + | — | W41 | — | 0.5 | OEM-T121-118 | — | — | — |
| L3 | GPO 11/MOTOR 1 - | — | W42 | — | 0.5 | OEM-T121-117 | — | — | — |
| L4 | ENGINE GROUND 2 | — | W11 | — | 0.85 | SP-GND-1 | — | — | — |
| M1 | INJECTOR OUT 12 | — | — | — | — | — | — | — | — |
| M2 | GPO 13/MOTOR 2 + | — | — | — | — | — | — | — | — |
| M3 | GPO 14/MOTOR 2 - | — | — | — | — | — | — | — | — |
| M4 | 12V ECU 2 | — | W4 | — | 0.85 | SP-14V-1 | — | — | — |
MAXXECUPRO-C4
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| A1 | CAN 2 H | — | W71 | — | 0.5 | OEM-T121-60 | — | — | — |
| A2 | CAN 2 L | — | W72 | — | 0.5 | OEM-T121-58 | — | — | — |
| A3 | 0-5V out 1 | — | — | — | — | — | — | — | — |
| A4 | 0-5V out 2 | — | — | — | — | — | — | — | — |
| B1 | AIN 18 (0-5V) | — | — | — | — | — | — | — | — |
| B2 | AIN 17 (0-5V) | — | — | — | — | — | — | — | — |
| B3 | AIN 16 (0-5V) | — | — | — | — | — | — | — | — |
| B4 | AIN 15 (0-5V) | — | — | — | — | — | — | — | — |
| C1 | AIN 14 (0-5V) | — | — | — | — | — | — | — | — |
| C2 | AIN 13 (0-5V) | — | — | — | — | — | — | — | — |
| C3 | AIN 19 (temp) | — | — | — | — | — | — | — | — |
| C4 | AIN 20 (temp) | — | — | — | — | — | — | — | — |
| D1 | AIN 21 (temp) | — | — | — | — | — | — | — | — |
| D2 | AIN 22 (temp) | — | — | — | — | — | — | — | — |
| D3 | DIN 8 (switch) | — | — | — | — | — | — | — | — |
| D4 | DIN 9 (switch) | — | — | — | — | — | — | — | — |
| E1 | DIN 10 (switch) | — | — | — | — | — | — | — | — |
| E2 | DIN 11 (switch) | — | — | — | — | — | — | — | — |
| E3 | +5V sensor supply 3 | — | W28 | — | 0.5 | OEM-T121-83 | — | — | — |
| E4 | 5-10V sensor supply | — | — | — | — | — | — | — | — |
| F1 | GPO 23-30 flyback | — | — | — | — | — | — | — | — |
| F2 | Knock 1 | — | W31 | — | 0.5 | OEM-T121-106 | — | — | — |
| F3 | Knock 2 | — | W32 | — | 0.5 | OEM-T121-107 | — | — | — |
| F4 | Sensor GND3 / knock ground | — | — | — | — | — | — | — | — |
| G1 | GPO 23 | — | W61 | — | 0.5 | OEM-T121-9 | — | — | — |
| G2 | GPO 24 | — | W62 | — | 0.5 | OEM-T121-37 | — | — | — |
| G3 | GPO 25 | — | — | — | — | — | — | — | — |
| G4 | GPO 26 | — | — | — | — | — | — | — | — |
| H1 | GPO 27 | — | — | — | — | — | — | — | — |
| H2 | GPO 28 | — | — | — | — | — | — | — | — |
| H3 | GPO 29 | — | — | — | — | — | — | — | — |
| H4 | GPO 30 | — | — | — | — | — | — | — | — |
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) | — | W45 | — | 0.5 | MAXXECUPRO-C1-J4 | — | — | — |
| 102 | Ignition coil 1 (N127) | — | W33 | — | 0.5 | MAXXECUPRO-C1-A2 | — | — | — |
| 103 | Ignition coil 3 (N158) | — | W35 | — | 0.5 | MAXXECUPRO-C1-B2 | — | — | — |
| 104 | Boost control solenoid (N75) | — | W55 | — | 0.5 | MAXXECUPRO-C1-D4 | — | — | — |
| 105 | Diverter valve (N249) | — | W56 | — | 0.5 | MAXXECUPRO-C1-E4 | — | — | — |
| 106 | Knock sensor 1 (G61) | — | W31 | — | 0.5 | MAXXECUPRO-C4-F2 | — | — | — |
| 107 | Knock sensor 2 (G66) | — | W32 | — | 0.5 | MAXXECUPRO-C4-F3 | — | — | — |
| 108 | Sensor ground | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 115 | VVT camshaft adjustment valve (N205) | — | W57 | — | 0.5 | MAXXECUPRO-C1-A1 | — | — | — |
| 117 | Throttle motor G186 (+) | — | W42 | — | 0.5 | MAXXECUPRO-C3-L3 | — | — | — |
| 118 | Throttle motor G186 (−) | — | W41 | — | 0.5 | MAXXECUPRO-C3-L2 | — | — | — |
| 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 | — | — | — |
| 27 | MAF sensor supply (G70) | — | — | — | — | — | — | — | — |
| 29 | MAF sensor ground (G70) | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 3 | Ignition switch +12V (term 15) | — | W43 | — | 0.5 | MAXXECUPRO-C3-K3 | — | — | — |
| 33 | Accelerator pedal position 1 (G79) | — | W46 | — | 0.5 | MAXXECUPRO-C1-G2 | — | — | — |
| 34 | Accelerator pedal position 1 ground (G79) | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 35 | Accelerator pedal position 2 (G185) | — | W48 | — | 0.5 | MAXXECUPRO-C3-D1 | — | — | — |
| 36 | Accelerator pedal position 2 ground (G185) | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 37 | Engine speed signal (tacho to cluster) | — | W62 | — | 0.5 | MAXXECUPRO-C4-G2 | — | — | — |
| 43 | K-line diagnostics (OBD pin 7) | — | — | — | — | — | — | — | — |
| 47 | Check engine light (MIL) | — | W58 | — | 0.5 | MAXXECUPRO-C1-B1 | — | — | — |
| 48 | EPC warning light | — | W59 | — | 0.5 | MAXXECUPRO-C1-C1 | — | — | — |
| 5 | Wideband lambda heater (Z19) | — | W53 | — | 0.5 | MAXXECUPRO-C1-D1 | — | — | — |
| 51 | Wideband lambda pump (G39) | — | W63 | — | 0.5 | MAXXECUPRO-C1-G3 | — | — | — |
| 52 | Wideband lambda pump (G39) | — | W64 | — | 0.5 | MAXXECUPRO-C3-B2 | — | — | — |
| 53 | MAF sensor signal (G70) | — | W44 | — | 0.5 | MAXXECUPRO-C1-J3 | — | — | — |
| 54 | Road speed signal (VSS) | — | W70 | — | 0.5 | MAXXECUPRO-C1-K3 | — | — | — |
| 58 | CAN bus low | — | W72 | — | 0.5 | MAXXECUPRO-C4-A2 | — | — | — |
| 60 | CAN bus high | — | W71 | — | 0.5 | MAXXECUPRO-C4-A1 | — | — | — |
| 62 | Battery constant +12V (term 30) | — | — | — | — | — | — | — | — |
| 63 | Post-cat lambda heater (Z29) | — | W54 | — | 0.5 | MAXXECUPRO-C3-E1 | — | — | — |
| 64 | EVAP canister valve (N80) | — | W60 | — | 0.5 | MAXXECUPRO-C1-A4 | — | — | — |
| 65 | Fuel pump relay control | — | W51 | — | 0.5 | MAXXECUPRO-C1-B4 | — | — | — |
| 66 | Secondary-air pump relay (J299) | — | W52 | — | 0.5 | MAXXECUPRO-C1-C4 | — | — | — |
| 68 | Post-cat lambda signal (G130) | — | W67 | — | 0.5 | MAXXECUPRO-C3-D3 | — | — | — |
| 69 | Post-cat lambda signal (G130) | — | W68 | — | 0.5 | MAXXECUPRO-C3-E2 | — | — | — |
| 70 | Wideband lambda Nernst signal (G39) | — | W65 | — | 0.5 | MAXXECUPRO-C1-F4 | — | — | — |
| 71 | Wideband lambda Nernst signal (G39) | — | W66 | — | 0.5 | MAXXECUPRO-C3-B3 | — | — | — |
| 72 | Accelerator pedal position 1 5V supply (G79) | — | W22 | — | 0.5 | SP-5V1-1 | — | — | — |
| 73 | Accelerator pedal position 2 5V supply (G185) | — | W25 | — | 0.5 | SP-5V2-1 | — | — | — |
| 82 | Crank position sensor (G28) | — | W29 | — | 0.5 | MAXXECUPRO-C1-H3 | — | — | — |
| 83 | Throttle position sensor 5V supply (G187/G188) | — | W28 | — | 0.5 | MAXXECUPRO-C4-E3 | — | — | — |
| 84 | Throttle position sensor 1 (G187) | — | W47 | — | 0.5 | MAXXECUPRO-C3-C3 | — | — | — |
| 85 | Intake air temperature (G42) | — | W69 | — | 0.5 | MAXXECUPRO-C1-F2 | — | — | — |
| 86 | Camshaft position sensor (G40) | — | W30 | — | 0.5 | MAXXECUPRO-C1-H4 | — | — | — |
| 88 | Injector 4 (N33) | — | W40 | — | 0.5 | MAXXECUPRO-C1-M2 | — | — | — |
| 89 | Injector 2 (N31) | — | W38 | — | 0.5 | MAXXECUPRO-C1-K2 | — | — | — |
| 9 | Secondary-air injection valve (N112) | — | W61 | — | 0.5 | MAXXECUPRO-C4-G1 | — | — | — |
| 90 | Crank position sensor ground (G28) | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 91 | Throttle position sensor ground (G187/G188) | — | W17 | — | 0.5 | SP-0V-1 | — | — | — |
| 92 | Throttle position sensor 2 (G188) | — | W49 | — | 0.5 | MAXXECUPRO-C3-D2 | — | — | — |
| 93 | Engine coolant temperature (G62) | — | W50 | — | 0.5 | MAXXECUPRO-C1-F1 | — | — | — |
| 94 | Ignition coil 4 (N163) | — | W36 | — | 0.5 | MAXXECUPRO-C1-B3 | — | — | — |
| 95 | Ignition coil 2 (N128) | — | W34 | — | 0.5 | MAXXECUPRO-C1-A3 | — | — | — |
| 96 | Injector 1 (N30) | — | W37 | — | 0.5 | MAXXECUPRO-C1-K1 | — | — | — |
| 97 | Injector 3 (N32) | — | W39 | — | 0.5 | MAXXECUPRO-C1-M1 | — | — | — |
| 98 | Cam + boost sensor 5V supply (G40/G31) | — | W23 | — | 0.5 | SP-5V1-1 | — | — | — |
| 99 | Knock sensor 5V supply (G61/G66) | — | W26 | — | 0.5 | SP-5V2-1 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W12 | — | 0.5 | OEM-T121-108 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-T121-29 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-T121-34 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | OEM-T121-36 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | OEM-T121-90 | — | — | — |
| 1 | — | — | W17 | — | 0.5 | OEM-T121-91 | — | — | — |
| 1 | — | — | W18 | — | 0.5 | MAXXECUPRO-C1-H1 | — | — | — |
| 1 | — | — | W19 | — | 0.5 | MAXXECUPRO-C1-H2 | — | — | — |
| 1 | — | — | W20 | — | 0.5 | MAXXECUPRO-C3-J2 | — | — | — |
| 1 | — | — | W21 | — | 0.5 | MAXXECUPRO-C3-J3 | — | — | — |
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 | MAXXECUPRO-C1-M4 | — | — | — |
| 1 | — | — | W4 | — | 0.85 | MAXXECUPRO-C3-M4 | — | — | — |
SP-5V1
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W22 | — | 0.5 | OEM-T121-72 | — | — | — |
| 1 | — | — | W23 | — | 0.5 | OEM-T121-98 | — | — | — |
| 1 | — | — | W24 | — | 0.5 | MAXXECUPRO-C1-G1 | — | — | — |
SP-5V2
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W25 | — | 0.5 | OEM-T121-73 | — | — | — |
| 1 | — | — | W26 | — | 0.5 | OEM-T121-99 | — | — | — |
| 1 | — | — | W27 | — | 0.5 | MAXXECUPRO-C3-C2 | — | — | — |
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 | MAXXECUPRO-C1-L4 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | MAXXECUPRO-C2-H1 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | MAXXECUPRO-C2-H2 | — | — | — |
| 1 | — | — | W10 | — | 0.85 | MAXXECUPRO-C2-H3 | — | — | — |
| 1 | — | — | W11 | — | 0.85 | MAXXECUPRO-C3-L4 | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-T121-1 | ECU ground | ground | MAXXECUPRO-C1-L4 + MAXXECUPRO-C2-H1 + MAXXECUPRO-C2-H2 + MAXXECUPRO-C2-H3 + MAXXECUPRO-C3-L4 | Engine GND + Engine ground 3 + Engine ground 3 + Engine ground 3 + ENGINE GROUND 2 | ground | corroborated | |
| OEM-T121-101 | Boost pressure sensor (G31) | analog_in | MAXXECUPRO-C1-J4 | AIN 4 (0-5V) | analog_in | corroborated | |
| OEM-T121-102 | Ignition coil 1 (N127) | ignition_out | MAXXECUPRO-C1-A2 | IGN 1 | ignition_out | corroborated | |
| OEM-T121-103 | Ignition coil 3 (N158) | ignition_out | MAXXECUPRO-C1-B2 | IGN 3 | ignition_out | corroborated | |
| OEM-T121-104 | Boost control solenoid (N75) | low_side_out | MAXXECUPRO-C1-D4 | GPO 3 | low_side_out | corroborated | |
| OEM-T121-105 | Diverter valve (N249) | low_side_out | MAXXECUPRO-C1-E4 | GPO 4 | low_side_out | corroborated | |
| OEM-T121-106 | Knock sensor 1 (G61) | knock_in | MAXXECUPRO-C4-F2 | Knock 1 | knock_in | corroborated | |
| OEM-T121-107 | Knock sensor 2 (G66) | knock_in | MAXXECUPRO-C4-F3 | Knock 2 | knock_in | corroborated | |
| OEM-T121-108 | Sensor ground | sensor_ground | MAXXECUPRO-C1-H1 + MAXXECUPRO-C1-H2 + MAXXECUPRO-C3-J2 + MAXXECUPRO-C3-J3 | Sensor GND + Trigger GND + SENSOR GND + SENSOR GND | sensor_ground | corroborated | |
| OEM-T121-115 | VVT camshaft adjustment valve (N205) | low_side_out | MAXXECUPRO-C1-A1 | GPO 5 | low_side_out | corroborated | |
| OEM-T121-117 | Throttle motor G186 (+) | hbridge_out | MAXXECUPRO-C3-L3 | GPO 11/MOTOR 1 - | hbridge_out | corroborated | |
| OEM-T121-118 | Throttle motor G186 (−) | hbridge_out | MAXXECUPRO-C3-L2 | GPO 12/MOTOR 1 + | hbridge_out | corroborated | |
| OEM-T121-121 | ECM + coil power (J271 relay feed) | power_in | MAXXECUPRO-C1-M4 + MAXXECUPRO-C3-M4 | +12V ECU power supply + 12V ECU 2 | power_in | corroborated | |
| OEM-T121-2 | ECU ground | ground | MAXXECUPRO-C1-L4 + MAXXECUPRO-C2-H1 + MAXXECUPRO-C2-H2 + MAXXECUPRO-C2-H3 + MAXXECUPRO-C3-L4 | Engine GND + Engine ground 3 + Engine ground 3 + Engine ground 3 + ENGINE GROUND 2 | ground | corroborated | |
| OEM-T121-21 | ECM power (J271 relay feed) | power_in | MAXXECUPRO-C1-M4 + MAXXECUPRO-C3-M4 | +12V ECU power supply + 12V ECU 2 | power_in | corroborated | |
| OEM-T121-27 | MAF sensor supply (G70) | power_in | — | — | — | corroborated | |
| OEM-T121-29 | MAF sensor ground (G70) | sensor_ground | MAXXECUPRO-C1-H1 + MAXXECUPRO-C1-H2 + MAXXECUPRO-C3-J2 + MAXXECUPRO-C3-J3 | Sensor GND + Trigger GND + SENSOR GND + SENSOR GND | sensor_ground | corroborated | |
| OEM-T121-3 | Ignition switch +12V (term 15) | digital_in | MAXXECUPRO-C3-K3 | KEY IN 12V | digital_in | corroborated | |
| OEM-T121-33 | Accelerator pedal position 1 (G79) | analog_in | MAXXECUPRO-C1-G2 | TPS/AIN | analog_in | corroborated | |
| OEM-T121-34 | Accelerator pedal position 1 ground (G79) | sensor_ground | MAXXECUPRO-C1-H1 + MAXXECUPRO-C1-H2 + MAXXECUPRO-C3-J2 + MAXXECUPRO-C3-J3 | Sensor GND + Trigger GND + SENSOR GND + SENSOR GND | sensor_ground | corroborated | |
| OEM-T121-35 | Accelerator pedal position 2 (G185) | analog_in | MAXXECUPRO-C3-D1 | ANALOG IN 6 (0-5V) | analog_in | corroborated | |
| OEM-T121-36 | Accelerator pedal position 2 ground (G185) | sensor_ground | MAXXECUPRO-C1-H1 + MAXXECUPRO-C1-H2 + MAXXECUPRO-C3-J2 + MAXXECUPRO-C3-J3 | Sensor GND + Trigger GND + SENSOR GND + SENSOR GND | sensor_ground | corroborated | |
| OEM-T121-37 | Engine speed signal (tacho to cluster) | tacho_out | MAXXECUPRO-C4-G2 | GPO 24 | low_side_out | corroborated | |
| OEM-T121-43 | K-line diagnostics (OBD pin 7) | serial | — | — | — | corroborated | |
| OEM-T121-47 | Check engine light (MIL) | low_side_out | MAXXECUPRO-C1-B1 | GPO 6 | low_side_out | corroborated | |
| OEM-T121-48 | EPC warning light | low_side_out | MAXXECUPRO-C1-C1 | GPO 7 | low_side_out | corroborated | |
| OEM-T121-5 | Wideband lambda heater (Z19) | low_side_out | MAXXECUPRO-C1-D1 | WBO2 Heater- | low_side_out | corroborated | |
| OEM-T121-51 | Wideband lambda pump (G39) | wb_ip | MAXXECUPRO-C1-G3 | WBO2 IP | wb_ip | corroborated | |
| OEM-T121-52 | Wideband lambda pump (G39) | wb_ip | MAXXECUPRO-C3-B2 | WBO2 2 IP | wb_ip | corroborated | |
| OEM-T121-53 | MAF sensor signal (G70) | analog_in | MAXXECUPRO-C1-J3 | AIN 3 (0-5V) | analog_in | corroborated | |
| OEM-T121-54 | Road speed signal (VSS) | digital_in | MAXXECUPRO-C1-K3 | DIN/VR 1 | digital_in | corroborated | |
| OEM-T121-58 | CAN bus low | can_l | MAXXECUPRO-C4-A2 | CAN 2 L | can_l | corroborated | |
| OEM-T121-60 | CAN bus high | can_h | MAXXECUPRO-C4-A1 | CAN 2 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 | MAXXECUPRO-C3-E1 | GPO 10/WBO2 2 HTR | low_side_out | corroborated | |
| OEM-T121-64 | EVAP canister valve (N80) | low_side_out | MAXXECUPRO-C1-A4 | GPO 8/TACHO | low_side_out | corroborated | |
| OEM-T121-65 | Fuel pump relay control | low_side_out | MAXXECUPRO-C1-B4 | GPO 1 | low_side_out | corroborated | |
| OEM-T121-66 | Secondary-air pump relay (J299) | low_side_out | MAXXECUPRO-C1-C4 | GPO 2 | low_side_out | corroborated | |
| OEM-T121-68 | Post-cat lambda signal (G130) | lambda_nb_in | MAXXECUPRO-C3-D3 | ANALOG IN 8 (0-5V) | analog_in | corroborated | |
| OEM-T121-69 | Post-cat lambda signal (G130) | lambda_nb_in | MAXXECUPRO-C3-E2 | ANALOG IN 9 (0-5V) | analog_in | corroborated | |
| OEM-T121-70 | Wideband lambda Nernst signal (G39) | wb_vs | MAXXECUPRO-C1-F4 | WBO2 VS | wb_vs | corroborated | |
| OEM-T121-71 | Wideband lambda Nernst signal (G39) | wb_vs | MAXXECUPRO-C3-B3 | WBO2 2 VS | wb_vs | corroborated | |
| OEM-T121-72 | Accelerator pedal position 1 5V supply (G79) | vref | MAXXECUPRO-C1-G1 | +5V sensor supply | vref | corroborated | |
| OEM-T121-73 | Accelerator pedal position 2 5V supply (G185) | vref | MAXXECUPRO-C3-C2 | +5V SENSOR SUPPLY 2 | vref | corroborated | |
| OEM-T121-82 | Crank position sensor (G28) | trigger_in | MAXXECUPRO-C1-H3 | TRIGGER | trigger_in | corroborated | |
| OEM-T121-83 | Throttle position sensor 5V supply (G187/G188) | vref | MAXXECUPRO-C4-E3 | +5V sensor supply 3 | vref | corroborated | |
| OEM-T121-84 | Throttle position sensor 1 (G187) | analog_in | MAXXECUPRO-C3-C3 | ANALOG IN 5 (0-5V) | analog_in | corroborated | |
| OEM-T121-85 | Intake air temperature (G42) | temp_in | MAXXECUPRO-C1-F2 | IAT | temp_in | corroborated | |
| OEM-T121-86 | Camshaft position sensor (G40) | trigger_in | MAXXECUPRO-C1-H4 | HOME | trigger_in | corroborated | |
| OEM-T121-88 | Injector 4 (N33) | injector_out | MAXXECUPRO-C1-M2 | INJ 4 | injector_out | corroborated | |
| OEM-T121-89 | Injector 2 (N31) | injector_out | MAXXECUPRO-C1-K2 | INJ 2 | injector_out | corroborated | |
| OEM-T121-9 | Secondary-air injection valve (N112) | low_side_out | MAXXECUPRO-C4-G1 | GPO 23 | low_side_out | corroborated | |
| OEM-T121-90 | Crank position sensor ground (G28) | sensor_ground | MAXXECUPRO-C1-H1 + MAXXECUPRO-C1-H2 + MAXXECUPRO-C3-J2 + MAXXECUPRO-C3-J3 | Sensor GND + Trigger GND + SENSOR GND + SENSOR GND | sensor_ground | corroborated | |
| OEM-T121-91 | Throttle position sensor ground (G187/G188) | sensor_ground | MAXXECUPRO-C1-H1 + MAXXECUPRO-C1-H2 + MAXXECUPRO-C3-J2 + MAXXECUPRO-C3-J3 | Sensor GND + Trigger GND + SENSOR GND + SENSOR GND | sensor_ground | corroborated | |
| OEM-T121-92 | Throttle position sensor 2 (G188) | analog_in | MAXXECUPRO-C3-D2 | ANALOG IN 7 (0-5V) | analog_in | corroborated | |
| OEM-T121-93 | Engine coolant temperature (G62) | temp_in | MAXXECUPRO-C1-F1 | CLT | temp_in | corroborated | |
| OEM-T121-94 | Ignition coil 4 (N163) | ignition_out | MAXXECUPRO-C1-B3 | IGN 4 | ignition_out | corroborated | |
| OEM-T121-95 | Ignition coil 2 (N128) | ignition_out | MAXXECUPRO-C1-A3 | IGN 2 | ignition_out | corroborated | |
| OEM-T121-96 | Injector 1 (N30) | injector_out | MAXXECUPRO-C1-K1 | INJ 1 | injector_out | corroborated | |
| OEM-T121-97 | Injector 3 (N32) | injector_out | MAXXECUPRO-C1-M1 | INJ 3 | injector_out | corroborated | |
| OEM-T121-98 | Cam + boost sensor 5V supply (G40/G31) | vref | MAXXECUPRO-C1-G1 | +5V sensor supply | vref | corroborated | |
| OEM-T121-99 | Knock sensor 5V supply (G61/G66) | vref | MAXXECUPRO-C3-C2 | +5V SENSOR SUPPLY 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 | MAXXECUPRO-C1-M4 | 0.85 | no route | +12V ECU power supply | — | |
| W4 | SP-14V-1 | MAXXECUPRO-C3-M4 | 0.85 | no route | 12V ECU 2 | — | |
| 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 | MAXXECUPRO-C1-L4 | 0.85 | no route | Engine GND | — | |
| W8 | SP-GND-1 | MAXXECUPRO-C2-H1 | 0.85 | no route | Engine ground 3 | — | |
| W9 | SP-GND-1 | MAXXECUPRO-C2-H2 | 0.85 | no route | Engine ground 3 | — | |
| W10 | SP-GND-1 | MAXXECUPRO-C2-H3 | 0.85 | no route | Engine ground 3 | — | |
| W11 | SP-GND-1 | MAXXECUPRO-C3-L4 | 0.85 | no route | ENGINE GROUND 2 | — | |
| W12 | OEM-T121-108 | SP-0V-1 | 0.5 | no route | Sensor ground | — | |
| W13 | OEM-T121-29 | SP-0V-1 | 0.5 | no route | MAF sensor ground (G70) | — | |
| W14 | OEM-T121-34 | SP-0V-1 | 0.5 | no route | Accelerator pedal position 1 ground (G79) | — | |
| W15 | OEM-T121-36 | SP-0V-1 | 0.5 | no route | Accelerator pedal position 2 ground (G185) | — | |
| W16 | OEM-T121-90 | SP-0V-1 | 0.5 | no route | Crank position sensor ground (G28) | — | |
| W17 | OEM-T121-91 | SP-0V-1 | 0.5 | no route | Throttle position sensor ground (G187/G188) | — | |
| W18 | SP-0V-1 | MAXXECUPRO-C1-H1 | 0.5 | no route | Sensor GND | — | |
| W19 | SP-0V-1 | MAXXECUPRO-C1-H2 | 0.5 | no route | Trigger GND | — | |
| W20 | SP-0V-1 | MAXXECUPRO-C3-J2 | 0.5 | no route | SENSOR GND | — | |
| W21 | SP-0V-1 | MAXXECUPRO-C3-J3 | 0.5 | no route | SENSOR GND | — | |
| W22 | OEM-T121-72 | SP-5V1-1 | 0.5 | no route | Accelerator pedal position 1 5V supply (G79) | — | |
| W23 | OEM-T121-98 | SP-5V1-1 | 0.5 | no route | Cam + boost sensor 5V supply (G40/G31) | — | |
| W24 | SP-5V1-1 | MAXXECUPRO-C1-G1 | 0.5 | no route | +5V sensor supply | — | |
| W25 | OEM-T121-73 | SP-5V2-1 | 0.5 | no route | Accelerator pedal position 2 5V supply (G185) | — | |
| W26 | OEM-T121-99 | SP-5V2-1 | 0.5 | no route | Knock sensor 5V supply (G61/G66) | — | |
| W27 | SP-5V2-1 | MAXXECUPRO-C3-C2 | 0.5 | no route | +5V SENSOR SUPPLY 2 | — | |
| W28 | OEM-T121-83 | MAXXECUPRO-C4-E3 | 0.5 | no route | Throttle position sensor 5V supply (G187/G188) | — | |
| W29 | OEM-T121-82 | MAXXECUPRO-C1-H3 | 0.5 | no route | Crank position sensor (G28) | — | |
| W30 | OEM-T121-86 | MAXXECUPRO-C1-H4 | 0.5 | no route | Camshaft position sensor (G40) | — | |
| W31 | OEM-T121-106 | MAXXECUPRO-C4-F2 | 0.5 | no route | Knock sensor 1 (G61) | — | |
| W32 | OEM-T121-107 | MAXXECUPRO-C4-F3 | 0.5 | no route | Knock sensor 2 (G66) | — | |
| W33 | OEM-T121-102 | MAXXECUPRO-C1-A2 | 0.5 | no route | Ignition coil 1 (N127) | — | |
| W34 | OEM-T121-95 | MAXXECUPRO-C1-A3 | 0.5 | no route | Ignition coil 2 (N128) | — | |
| W35 | OEM-T121-103 | MAXXECUPRO-C1-B2 | 0.5 | no route | Ignition coil 3 (N158) | — | |
| W36 | OEM-T121-94 | MAXXECUPRO-C1-B3 | 0.5 | no route | Ignition coil 4 (N163) | — | |
| W37 | OEM-T121-96 | MAXXECUPRO-C1-K1 | 0.5 | no route | Injector 1 (N30) | — | |
| W38 | OEM-T121-89 | MAXXECUPRO-C1-K2 | 0.5 | no route | Injector 2 (N31) | — | |
| W39 | OEM-T121-97 | MAXXECUPRO-C1-M1 | 0.5 | no route | Injector 3 (N32) | — | |
| W40 | OEM-T121-88 | MAXXECUPRO-C1-M2 | 0.5 | no route | Injector 4 (N33) | — | |
| W41 | OEM-T121-118 | MAXXECUPRO-C3-L2 | 0.5 | no route | Throttle motor G186 (−) | — | |
| W42 | OEM-T121-117 | MAXXECUPRO-C3-L3 | 0.5 | no route | Throttle motor G186 (+) | — | |
| W43 | OEM-T121-3 | MAXXECUPRO-C3-K3 | 0.5 | no route | Ignition switch +12V (term 15) | — | |
| W44 | OEM-T121-53 | MAXXECUPRO-C1-J3 | 0.5 | no route | MAF sensor signal (G70) | — | |
| W45 | OEM-T121-101 | MAXXECUPRO-C1-J4 | 0.5 | no route | Boost pressure sensor (G31) | — | |
| W46 | OEM-T121-33 | MAXXECUPRO-C1-G2 | 0.5 | no route | Accelerator pedal position 1 (G79) | — | |
| W47 | OEM-T121-84 | MAXXECUPRO-C3-C3 | 0.5 | no route | Throttle position sensor 1 (G187) | — | |
| W48 | OEM-T121-35 | MAXXECUPRO-C3-D1 | 0.5 | no route | Accelerator pedal position 2 (G185) | — | |
| W49 | OEM-T121-92 | MAXXECUPRO-C3-D2 | 0.5 | no route | Throttle position sensor 2 (G188) | — | |
| W50 | OEM-T121-93 | MAXXECUPRO-C1-F1 | 0.5 | no route | Engine coolant temperature (G62) | — | |
| W51 | OEM-T121-65 | MAXXECUPRO-C1-B4 | 0.5 | no route | Fuel pump relay control | — | |
| W52 | OEM-T121-66 | MAXXECUPRO-C1-C4 | 0.5 | no route | Secondary-air pump relay (J299) | — | |
| W53 | OEM-T121-5 | MAXXECUPRO-C1-D1 | 0.5 | no route | Wideband lambda heater (Z19) | — | |
| W54 | OEM-T121-63 | MAXXECUPRO-C3-E1 | 0.5 | no route | Post-cat lambda heater (Z29) | — | |
| W55 | OEM-T121-104 | MAXXECUPRO-C1-D4 | 0.5 | no route | Boost control solenoid (N75) | — | |
| W56 | OEM-T121-105 | MAXXECUPRO-C1-E4 | 0.5 | no route | Diverter valve (N249) | — | |
| W57 | OEM-T121-115 | MAXXECUPRO-C1-A1 | 0.5 | no route | VVT camshaft adjustment valve (N205) | — | |
| W58 | OEM-T121-47 | MAXXECUPRO-C1-B1 | 0.5 | no route | Check engine light (MIL) | — | |
| W59 | OEM-T121-48 | MAXXECUPRO-C1-C1 | 0.5 | no route | EPC warning light | — | |
| W60 | OEM-T121-64 | MAXXECUPRO-C1-A4 | 0.5 | no route | EVAP canister valve (N80) | — | |
| W61 | OEM-T121-9 | MAXXECUPRO-C4-G1 | 0.5 | no route | Secondary-air injection valve (N112) | — | |
| W62 | OEM-T121-37 | MAXXECUPRO-C4-G2 | 0.5 | no route | Engine speed signal (tacho to cluster) | — | |
| W63 | OEM-T121-51 | MAXXECUPRO-C1-G3 | 0.5 | no route | Wideband lambda pump (G39) | — | |
| W64 | OEM-T121-52 | MAXXECUPRO-C3-B2 | 0.5 | no route | Wideband lambda pump (G39) | — | |
| W65 | OEM-T121-70 | MAXXECUPRO-C1-F4 | 0.5 | no route | Wideband lambda Nernst signal (G39) | — | |
| W66 | OEM-T121-71 | MAXXECUPRO-C3-B3 | 0.5 | no route | Wideband lambda Nernst signal (G39) | — | |
| W67 | OEM-T121-68 | MAXXECUPRO-C3-D3 | 0.5 | no route | Post-cat lambda signal (G130) | — | |
| W68 | OEM-T121-69 | MAXXECUPRO-C3-E2 | 0.5 | no route | Post-cat lambda signal (G130) | — | |
| W69 | OEM-T121-85 | MAXXECUPRO-C1-F2 | 0.5 | no route | Intake air temperature (G42) | — | |
| W70 | OEM-T121-54 | MAXXECUPRO-C1-K3 | 0.5 | no route | Road speed signal (VSS) | — | |
| W71 | OEM-T121-60 | MAXXECUPRO-C4-A1 | 0.5 | no route | CAN bus high | — | |
| W72 | OEM-T121-58 | MAXXECUPRO-C4-A2 | 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 | MAXXECUPRO-C3-L2 | Cannot confirm MaxxECU PRO can drive the throttle motor: MAXXECUPRO-C3-L2 "GPO 12/MOTOR 1 +" is rated 2.0 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_MOTOR_CURRENT | MAXXECUPRO-C3-L3 | Cannot confirm MaxxECU PRO can drive the throttle motor: MAXXECUPRO-C3-L3 "GPO 11/MOTOR 1 -" is rated 2.0 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_SHARED_5V | MAXXECUPRO-C1-G1 + 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 (MAXXECUPRO-C1-G1). On a drive-by-wire car the OEM splits them so one short or fault can't corrupt both throttle/pedal tracks at once. MaxxECU PRO 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 | MAXXECUPRO-C3-C2 + 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 (MAXXECUPRO-C3-C2). On a drive-by-wire car the OEM splits them so one short or fault can't corrupt both throttle/pedal tracks at once. MaxxECU PRO 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 | LOAD_UNKNOWN | MAXXECUPRO-C1-B4 | MAXXECUPRO-C1-B4 "GPO 1" drives OEM-T121-65 Fuel pump relay control (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | LOAD_UNKNOWN | MAXXECUPRO-C1-C4 | MAXXECUPRO-C1-C4 "GPO 2" drives OEM-T121-66 Secondary-air pump relay (J299) (load 0.2 A) but its current rating is unknown. Check the ECU manual. |
| warn | SUPPLY_GROUP | MAXXECUPRO-C1-G1 + 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 | MAXXECUPRO-C3-C2 + 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-T121-37 ↔ MAXXECUPRO-C4-G2 | OEM-T121-37 "Engine speed signal (tacho to cluster)" [tacho_out] is wired to MAXXECUPRO-C4-G2 "GPO 24" [low_side_out]. Tacho as a low-side output: check the tach needs a pull-up. |
| info | UNMAPPED | OEM | 2 optional OEM pins are not mapped: OEM-T121-27 MAF sensor supply (G70); OEM-T121-43 K-line diagnostics (OBD pin 7) |
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): MaxxECU MaxxECU PRO has no battery-constant input; not needed - OEM-T121 43: K-line diagnostics (OBD pin 7): no free k_line on MaxxECU MaxxECU PRO - 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 | MaxxECU GEN1 pinout (MINI / STREET / SPORT / V1 / RACE / PRO) | http://www.maxxecu.com/webhelp/wirings-maxxecu_pinout.html | archive | 2026-10-05 | 2e37b6814690 |
| 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 | — | — | — |