BMW 3 Series E36 1990–2000 (M50/M52) → DTAFast T4+ (auto)
BMW 3 Series E36 1990–2000 (M50/M52) — DTAFast — T4+
⚠ NOT CHECKED. Don't build from this.
Drawn by Michael Gnankou · Rev 0 · draft · 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 | draft · not yet verified: nobody has reported building and running this harness |
|---|---|
| Open errors | 5: read the Findings page before cutting any wire |
| Size of the job | 44 wires · 7 connectors · 3 part lines |
| Tools | Crimp and extraction tools for each terminal family (see Connectors) · wire strippers · multimeter · heat gun + heat-shrink |
| Terminals | 3-1447221-4 |
| 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-X-54 | SP-14V-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W2 | SP-14V-1 | T4-C1-31 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W3 | OEM-X-26 | T4-C3-26 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W4 | OEM-X-15 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W5 | OEM-X-34 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W6 | OEM-X-55 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W7 | OEM-X-6 | SP-GND-1 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W8 | SP-GND-1 | T4-C1-13 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W9 | SP-GND-1 | T4-C1-14 | 0.85 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W10 | OEM-X-28 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W11 | OEM-X-40 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W12 | OEM-X-43 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W13 | OEM-X-44 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W14 | OEM-X-71 | SP-0V-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W15 | SP-0V-1 | T4-C2-21 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W16 | SP-0V-1 | T4-C2-33 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W17 | OEM-X-59 | T4-C2-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W18 | OEM-X-16 | T4-C2-12 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W19 | OEM-X-17 | T4-C2-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W20 | OEM-X-50 | T4-C1-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W21 | OEM-X-51 | T4-C1-18 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W22 | OEM-X-52 | T4-C1-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W23 | OEM-X-23 | T4-C1-26 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W24 | OEM-X-33 | T4-C1-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W25 | OEM-X-32 | T4-C1-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W26 | OEM-X-31 | T4-C1-34 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W27 | OEM-X-5 | T4-C1-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W28 | OEM-X-3 | T4-C1-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W29 | OEM-X-4 | T4-C1-17 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W30 | OEM-X-1 | T4-C1-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W31 | OEM-X-27 | T4-C1-4 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W32 | OEM-X-41 | T4-C2-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W33 | OEM-X-73 | T4-C2-1 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W34 | OEM-X-78 | T4-C2-7 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W35 | OEM-X-38 | T4-C3-9 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W36 | OEM-X-2 | T4-C1-3 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W37 | OEM-X-29 | T4-C3-22 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W38 | OEM-X-36 | T4-C3-23 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W39 | OEM-X-7 | T4-C3-24 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W40 | OEM-X-8 | T4-C3-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W41 | OEM-X-47 | T4-C3-10 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W42 | OEM-X-13 | T4-C2-5 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W43 | OEM-X-77 | T4-C2-25 | 0.5 | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | ☐ | |
| W44 | OEM-X-42 | T4-C2-2 | 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 | T4-C3-26 | T4-C2-21 | open (OL) | +12 V supply must not touch sensor ground | |
| 2 | T4-C1-13 | T4-C1-31 | open (OL) | power ground must not touch +12 V supply | |
| 3 | T4-C1-13 | T4-C2-24 | open (OL) | power ground must not touch 5 V sensor reference | |
| 4 | T4-C1-13 | T4-C3-26 | open (OL) | power ground must not touch +12 V supply | |
| 5 | T4-C1-31 | T4-C2-24 | open (OL) | +12 V supply must not touch 5 V sensor reference | |
| 6 | T4-C2-21 | T4-C1-31 | open (OL) | sensor ground must not touch +12 V supply | |
| 7 | T4-C2-21 | T4-C2-24 | open (OL) | sensor ground must not touch 5 V sensor reference | |
| 8 | T4-C3-26 | T4-C2-24 | 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
OEM-X
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Fuel pump relay control | — | W30 | — | 0.5 | T4-C1-5 | — | — | — |
| 13 | O2 sensor signal | — | W42 | — | 0.5 | T4-C2-5 | — | — | — |
| 15 | Ground | — | W4 | — | 0.85 | SP-GND-1 | — | — | — |
| 16 | Crank position sensor (+) | — | W18 | — | 0.5 | T4-C2-12 | — | — | — |
| 17 | Camshaft position sensor (Hall) | — | W19 | — | 0.5 | T4-C2-22 | — | — | — |
| 2 | Idle speed control valve (close winding) | — | W36 | — | 0.5 | T4-C1-3 | — | — | — |
| 23 | Ignition coil cylinder 4 | — | W23 | — | 0.5 | T4-C1-26 | — | — | — |
| 24 | Ignition coil cylinder 6 | — | — | — | — | — | — | — | — |
| 25 | Ignition coil cylinder 5 | — | — | — | — | — | — | — | — |
| 26 | Battery voltage (constant +12V) | — | W3 | — | 0.85 | T4-C3-26 | — | — | — |
| 27 | Main relay control | — | W31 | — | 0.5 | T4-C1-4 | — | — | — |
| 28 | Ground (electronics + sensor shielding) | — | W10 | — | 0.5 | SP-0V-1 | — | — | — |
| 29 | Idle speed control valve (open winding) | — | W37 | — | 0.5 | T4-C3-22 | — | — | — |
| 3 | Injector cylinder 5 | — | W28 | — | 0.5 | T4-C1-9 | — | — | — |
| 31 | Injector cylinder 3 | — | W26 | — | 0.5 | T4-C1-34 | — | — | — |
| 32 | Injector cylinder 2 | — | W25 | — | 0.5 | T4-C1-17 | — | — | — |
| 33 | Injector cylinder 1 | — | W24 | — | 0.5 | T4-C1-9 | — | — | — |
| 34 | Ground (output stages) | — | W5 | — | 0.85 | SP-GND-1 | — | — | — |
| 36 | Evap purge solenoid | — | W38 | — | 0.5 | T4-C3-23 | — | — | — |
| 38 | O2 sensor heater relay control | — | W35 | — | 0.5 | T4-C3-9 | — | — | — |
| 4 | Injector cylinder 6 | — | W29 | — | 0.5 | T4-C1-17 | — | — | — |
| 40 | O2 sensor signal ground | — | W11 | — | 0.5 | SP-0V-1 | — | — | — |
| 41 | Mass air flow (MAF) signal | — | W32 | — | 0.5 | T4-C2-10 | — | — | — |
| 42 | Vehicle speed signal | — | W44 | — | 0.5 | T4-C2-2 | — | — | — |
| 43 | Crank position sensor (-) | — | W12 | — | 0.5 | SP-0V-1 | — | — | — |
| 44 | Sensor ground (IAT/ECT/TPS) | — | W13 | — | 0.5 | SP-0V-1 | — | — | — |
| 45 | Shield ground | — | — | — | — | — | — | — | — |
| 47 | Tachometer output | — | W41 | — | 0.5 | T4-C3-10 | — | — | — |
| 5 | Injector cylinder 4 | — | W27 | — | 0.5 | T4-C1-25 | — | — | — |
| 50 | Ignition coil cylinder 1 | — | W20 | — | 0.5 | T4-C1-10 | — | — | — |
| 51 | Ignition coil cylinder 2 | — | W21 | — | 0.5 | T4-C1-18 | — | — | — |
| 52 | Ignition coil cylinder 3 | — | W22 | — | 0.5 | T4-C1-1 | — | — | — |
| 54 | ECU power (+14V from main relay) | — | W1 | — | 0.85 | SP-14V-1 | — | — | — |
| 55 | Ground (ignition) | — | W6 | — | 0.85 | SP-GND-1 | — | — | — |
| 56 | Ignition switch (terminal 15) | — | — | — | — | — | — | — | — |
| 59 | +5V sensor supply | — | W17 | — | 0.5 | T4-C2-24 | — | — | — |
| 6 | Ground (injector output stages) | — | W7 | — | 0.85 | SP-GND-1 | — | — | — |
| 69 | Knock sensor cylinders 4-6 | — | — | — | — | — | — | — | — |
| 7 | VANOS intake camshaft solenoid | — | W39 | — | 0.5 | T4-C3-24 | — | — | — |
| 70 | Knock sensor cylinders 1-3 | — | — | — | — | — | — | — | — |
| 71 | Knock sensor ground/shield | — | W14 | — | 0.5 | SP-0V-1 | — | — | — |
| 73 | Throttle position (TPS) | — | W33 | — | 0.5 | T4-C2-1 | — | — | — |
| 77 | Intake air temperature (IAT) | — | W43 | — | 0.5 | T4-C2-25 | — | — | — |
| 78 | Engine coolant temperature (ECT) | — | W34 | — | 0.5 | T4-C2-7 | — | — | — |
| 8 | Check engine light (MIL) | — | W40 | — | 0.5 | T4-C3-25 | — | — | — |
SP-0V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W10 | — | 0.5 | OEM-X-28 | — | — | — |
| 1 | — | — | W11 | — | 0.5 | OEM-X-40 | — | — | — |
| 1 | — | — | W12 | — | 0.5 | OEM-X-43 | — | — | — |
| 1 | — | — | W13 | — | 0.5 | OEM-X-44 | — | — | — |
| 1 | — | — | W14 | — | 0.5 | OEM-X-71 | — | — | — |
| 1 | — | — | W15 | — | 0.5 | T4-C2-21 | — | — | — |
| 1 | — | — | W16 | — | 0.5 | T4-C2-33 | — | — | — |
SP-14V
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W1 | — | 0.85 | OEM-X-54 | — | — | — |
| 1 | — | — | W2 | — | 0.85 | T4-C1-31 | — | — | — |
SP-GND
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | W4 | — | 0.85 | OEM-X-15 | — | — | — |
| 1 | — | — | W5 | — | 0.85 | OEM-X-34 | — | — | — |
| 1 | — | — | W6 | — | 0.85 | OEM-X-55 | — | — | — |
| 1 | — | — | W7 | — | 0.85 | OEM-X-6 | — | — | — |
| 1 | — | — | W8 | — | 0.85 | T4-C1-13 | — | — | — |
| 1 | — | — | W9 | — | 0.85 | T4-C1-14 | — | — | — |
T4-C1
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Coil 3 | — | W22 | — | 0.5 | OEM-X-52 | — | — | — |
| 2 | — | — | — | — | — | — | — | — | — |
| 3 | PWM 3 | — | W36 | — | 0.5 | OEM-X-2 | — | — | — |
| 4 | PWM 2 | — | W31 | — | 0.5 | OEM-X-27 | — | — | — |
| 5 | PWM 1 | — | W30 | — | 0.5 | OEM-X-1 | — | — | — |
| 6 | Motor 1 + | — | — | — | — | — | — | — | — |
| 7 | Motor 1 - | — | — | — | — | — | — | — | — |
| 8 | — | — | — | — | — | — | — | — | — |
| 9 | Injector 1 | — | W24 | — | 0.5 | OEM-X-33 | — | — | — |
| 9 | Injector 1 | — | W28 | — | 0.5 | OEM-X-3 | — | — | — |
| 10 | Coil 1 | — | W20 | — | 0.5 | OEM-X-50 | — | — | — |
| 11 | — | — | — | — | — | — | — | — | — |
| 12 | — | — | — | — | — | — | — | — | — |
| 13 | Power Ground 1 | — | W8 | — | 0.85 | SP-GND-1 | — | — | — |
| 14 | Power Ground 2 | — | W9 | — | 0.85 | SP-GND-1 | — | — | — |
| 15 | — | — | — | — | — | — | — | — | — |
| 16 | — | — | — | — | — | — | — | — | — |
| 17 | Injector 2 | — | W25 | — | 0.5 | OEM-X-32 | — | — | — |
| 17 | Injector 2 | — | W29 | — | 0.5 | OEM-X-4 | — | — | — |
| 18 | Coil 2 | — | W21 | — | 0.5 | OEM-X-51 | — | — | — |
| 19 | — | — | — | — | — | — | — | — | — |
| 20 | — | — | — | — | — | — | — | — | — |
| 21 | — | — | — | — | — | — | — | — | — |
| 22 | — | — | — | — | — | — | — | — | — |
| 23 | — | — | — | — | — | — | — | — | — |
| 24 | — | — | — | — | — | — | — | — | — |
| 25 | Injector 4 | — | W27 | — | 0.5 | OEM-X-5 | — | — | — |
| 26 | Coil 4 | — | W23 | — | 0.5 | OEM-X-23 | — | — | — |
| 27 | — | — | — | — | — | — | — | — | — |
| 28 | — | — | — | — | — | — | — | — | — |
| 29 | — | — | — | — | — | — | — | — | — |
| 30 | — | — | — | — | — | — | — | — | — |
| 31 | Ignition 12v In | — | W2 | — | 0.85 | SP-14V-1 | — | — | — |
| 32 | — | — | — | — | — | — | — | — | — |
| 33 | — | — | — | — | — | — | — | — | — |
| 34 | Injector 3 | — | W26 | — | 0.5 | OEM-X-31 | — | — | — |
T4-C2
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | Analogue 2 | — | W33 | — | 0.5 | OEM-X-73 | — | — | — |
| 2 | Wheel 1 | — | W44 | — | 0.5 | OEM-X-42 | — | — | — |
| 3 | Analogue 10 | — | — | — | — | — | — | — | — |
| 4 | Digital 1 | — | — | — | — | — | — | — | — |
| 5 | Analogue 3 | — | W42 | — | 0.5 | OEM-X-13 | — | — | — |
| 6 | Analogue 4 | — | — | — | — | — | — | — | — |
| 7 | Thermistor 1 | — | W34 | — | 0.5 | OEM-X-78 | — | — | — |
| 8 | — | — | — | — | — | — | — | — | — |
| 9 | 5v Output | — | — | — | — | — | — | — | — |
| 10 | Analogue 1 | — | W32 | — | 0.5 | OEM-X-41 | — | — | — |
| 11 | — | — | — | — | — | — | — | — | — |
| 12 | Crank | — | W18 | — | 0.5 | OEM-X-16 | — | — | — |
| 13 | — | — | — | — | — | — | — | — | — |
| 14 | Digital 4 | — | — | — | — | — | — | — | — |
| 15 | Digital 5 | — | — | — | — | — | — | — | — |
| 16 | Analogue 11 | — | — | — | — | — | — | — | — |
| 17 | Thermistor 3 | — | — | — | — | — | — | — | — |
| 18 | — | — | — | — | — | — | — | — | — |
| 19 | Analogue 6 | — | — | — | — | — | — | — | — |
| 20 | — | — | — | — | — | — | — | — | — |
| 21 | Sensor Ground | — | W15 | — | 0.5 | SP-0V-1 | — | — | — |
| 22 | Cam 1 | — | W19 | — | 0.5 | OEM-X-17 | — | — | — |
| 23 | — | — | — | — | — | — | — | — | — |
| 24 | 5v Output | — | W17 | — | 0.5 | OEM-X-59 | — | — | — |
| 25 | Thermistor 2 | — | W43 | — | 0.5 | OEM-X-77 | — | — | — |
| 26 | CAN High | — | — | — | — | — | — | — | — |
| 27 | — | — | — | — | — | — | — | — | — |
| 28 | CAN Low | — | — | — | — | — | — | — | — |
| 29 | — | — | — | — | — | — | — | — | — |
| 30 | — | — | — | — | — | — | — | — | — |
| 31 | — | — | — | — | — | — | — | — | — |
| 32 | — | — | — | — | — | — | — | — | — |
| 33 | Sensor Ground | — | W16 | — | 0.5 | SP-0V-1 | — | — | — |
| 34 | Analogue 9 | — | — | — | — | — | — | — | — |
T4-C3
Mating face
Wire side
| Cavity | Function | Signal | Wire | Colour | Gauge (mm²) | Destination | Terminal | Seal | Plug |
|---|---|---|---|---|---|---|---|---|---|
| 1 | — | — | — | — | — | — | — | — | — |
| 2 | — | — | — | — | — | — | — | — | — |
| 3 | — | — | — | — | — | — | — | — | — |
| 4 | — | — | — | — | — | — | — | — | — |
| 5 | — | — | — | — | — | — | — | — | — |
| 6 | — | — | — | — | — | — | — | — | — |
| 7 | Lambda 1 Pump Current | — | — | — | — | — | — | — | — |
| 8 | Lambda 1 VGND | — | — | — | — | — | — | — | — |
| 9 | Lambda 1 Heater Negative | — | W35 | — | 0.5 | OEM-X-38 | — | — | — |
| 10 | PWM 8 | — | W41 | — | 0.5 | OEM-X-47 | — | — | — |
| 11 | Lambda 1 Trim Resistor | — | — | — | — | — | — | — | — |
| 12 | Lambda 1 Nernst Voltage | — | — | — | — | — | — | — | — |
| 13 | — | — | — | — | — | — | — | — | — |
| 14 | — | — | — | — | — | — | — | — | — |
| 15 | — | — | — | — | — | — | — | — | — |
| 16 | — | — | — | — | — | — | — | — | — |
| 17 | Analogue 7 | — | — | — | — | — | — | — | — |
| 18 | Analogue 8 | — | — | — | — | — | — | — | — |
| 19 | — | — | — | — | — | — | — | — | — |
| 20 | — | — | — | — | — | — | — | — | — |
| 21 | — | — | — | — | — | — | — | — | — |
| 22 | PWM 4 | — | W37 | — | 0.5 | OEM-X-29 | — | — | — |
| 23 | PWM 5 | — | W38 | — | 0.5 | OEM-X-36 | — | — | — |
| 24 | PWM 6 | — | W39 | — | 0.5 | OEM-X-7 | — | — | — |
| 25 | PWM 7 | — | W40 | — | 0.5 | OEM-X-8 | — | — | — |
| 26 | Permanent 12v | — | W3 | — | 0.85 | OEM-X-26 | — | — | — |
| 27 | Permanent 12v | — | — | — | — | — | — | — | — |
| 28 | — | — | — | — | — | — | — | — | — |
| 29 | — | — | — | — | — | — | — | — | — |
| 30 | — | — | — | — | — | — | — | — | — |
| 31 | — | — | — | — | — | — | — | — | — |
| 32 | — | — | — | — | — | — | — | — | — |
| 33 | — | — | — | — | — | — | — | — | — |
| 34 | — | — | — | — | — | — | — | — | — |
Pin map
| OEM point | OEM function | OEM family | Target point | Target function | Target family | Wire colour | Evidence |
|---|---|---|---|---|---|---|---|
| OEM-X-1 | Fuel pump relay control | low_side_out | T4-C1-5 | PWM 1 | low_side_out | corroborated | |
| OEM-X-13 | O2 sensor signal | lambda_nb_in | T4-C2-5 | Analogue 3 | analog_in | corroborated | |
| OEM-X-15 | Ground | ground | T4-C1-13 + T4-C1-14 | Power Ground 1 + Power Ground 2 | ground | corroborated | |
| OEM-X-16 | Crank position sensor (+) | trigger_in | T4-C2-12 | Crank | trigger_in | corroborated | |
| OEM-X-17 | Camshaft position sensor (Hall) | trigger_in | T4-C2-22 | Cam 1 | trigger_in | corroborated | |
| OEM-X-2 | Idle speed control valve (close winding) | low_side_out | T4-C1-3 | PWM 3 | low_side_out | corroborated | |
| OEM-X-23 | Ignition coil cylinder 4 | ignition_out | T4-C1-26 | Coil 4 | ignition_out | corroborated | |
| OEM-X-24 | Ignition coil cylinder 6 | ignition_out | — | — | — | corroborated | |
| OEM-X-25 | Ignition coil cylinder 5 | ignition_out | — | — | — | corroborated | |
| OEM-X-26 | Battery voltage (constant +12V) | power_in | T4-C3-26 | Permanent 12v | power_in | corroborated | |
| OEM-X-27 | Main relay control | low_side_out | T4-C1-4 | PWM 2 | low_side_out | corroborated | |
| OEM-X-28 | Ground (electronics + sensor shielding) | sensor_ground | T4-C2-21 + T4-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-X-29 | Idle speed control valve (open winding) | low_side_out | T4-C3-22 | PWM 4 | low_side_out | corroborated | |
| OEM-X-3 | Injector cylinder 5 | injector_out | T4-C1-9 | Injector 1 | injector_out | corroborated | |
| OEM-X-31 | Injector cylinder 3 | injector_out | T4-C1-34 | Injector 3 | injector_out | corroborated | |
| OEM-X-32 | Injector cylinder 2 | injector_out | T4-C1-17 | Injector 2 | injector_out | corroborated | |
| OEM-X-33 | Injector cylinder 1 | injector_out | T4-C1-9 | Injector 1 | injector_out | corroborated | |
| OEM-X-34 | Ground (output stages) | ground | T4-C1-13 + T4-C1-14 | Power Ground 1 + Power Ground 2 | ground | corroborated | |
| OEM-X-36 | Evap purge solenoid | low_side_out | T4-C3-23 | PWM 5 | low_side_out | corroborated | |
| OEM-X-38 | O2 sensor heater relay control | low_side_out | T4-C3-9 | Lambda 1 Heater Negative | low_side_out | corroborated | |
| OEM-X-4 | Injector cylinder 6 | injector_out | T4-C1-17 | Injector 2 | injector_out | corroborated | |
| OEM-X-40 | O2 sensor signal ground | sensor_ground | T4-C2-21 + T4-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-X-41 | Mass air flow (MAF) signal | analog_in | T4-C2-10 | Analogue 1 | analog_in | corroborated | |
| OEM-X-42 | Vehicle speed signal | digital_in | T4-C2-2 | Wheel 1 | digital_in | corroborated | |
| OEM-X-43 | Crank position sensor (-) | sensor_ground | T4-C2-21 + T4-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-X-44 | Sensor ground (IAT/ECT/TPS) | sensor_ground | T4-C2-21 + T4-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-X-45 | Shield ground | shield | — | — | — | corroborated | |
| OEM-X-47 | Tachometer output | tacho_out | T4-C3-10 | PWM 8 | low_side_out | corroborated | |
| OEM-X-5 | Injector cylinder 4 | injector_out | T4-C1-25 | Injector 4 | injector_out | corroborated | |
| OEM-X-50 | Ignition coil cylinder 1 | ignition_out | T4-C1-10 | Coil 1 | ignition_out | corroborated | |
| OEM-X-51 | Ignition coil cylinder 2 | ignition_out | T4-C1-18 | Coil 2 | ignition_out | corroborated | |
| OEM-X-52 | Ignition coil cylinder 3 | ignition_out | T4-C1-1 | Coil 3 | ignition_out | corroborated | |
| OEM-X-54 | ECU power (+14V from main relay) | power_in | T4-C1-31 | Ignition 12v In | power_in | corroborated | |
| OEM-X-55 | Ground (ignition) | ground | T4-C1-13 + T4-C1-14 | Power Ground 1 + Power Ground 2 | ground | corroborated | |
| OEM-X-56 | Ignition switch (terminal 15) | digital_in | — | — | — | corroborated | |
| OEM-X-59 | +5V sensor supply | vref | T4-C2-24 | 5v Output | vref | corroborated | |
| OEM-X-6 | Ground (injector output stages) | ground | T4-C1-13 + T4-C1-14 | Power Ground 1 + Power Ground 2 | ground | corroborated | |
| OEM-X-69 | Knock sensor cylinders 4-6 | knock_in | — | — | — | corroborated | |
| OEM-X-7 | VANOS intake camshaft solenoid | low_side_out | T4-C3-24 | PWM 6 | low_side_out | corroborated | |
| OEM-X-70 | Knock sensor cylinders 1-3 | knock_in | — | — | — | corroborated | |
| OEM-X-71 | Knock sensor ground/shield | sensor_ground | T4-C2-21 + T4-C2-33 | Sensor Ground + Sensor Ground | sensor_ground | corroborated | |
| OEM-X-73 | Throttle position (TPS) | analog_in | T4-C2-1 | Analogue 2 | analog_in | corroborated | |
| OEM-X-77 | Intake air temperature (IAT) | temp_in | T4-C2-25 | Thermistor 2 | temp_in | corroborated | |
| OEM-X-78 | Engine coolant temperature (ECT) | temp_in | T4-C2-7 | Thermistor 1 | temp_in | corroborated | |
| OEM-X-8 | Check engine light (MIL) | low_side_out | T4-C3-25 | PWM 7 | low_side_out | corroborated |
Cut list
| Wire | From | To | Gauge (mm²) | Colour | Length | Signal | Ident |
|---|---|---|---|---|---|---|---|
| W1 | OEM-X-54 | SP-14V-1 | 0.85 | no route | ECU power (+14V from main relay) | — | |
| W2 | SP-14V-1 | T4-C1-31 | 0.85 | no route | Ignition 12v In | — | |
| W3 | OEM-X-26 | T4-C3-26 | 0.85 | no route | Battery voltage (constant +12V) | — | |
| W4 | OEM-X-15 | SP-GND-1 | 0.85 | no route | Ground | — | |
| W5 | OEM-X-34 | SP-GND-1 | 0.85 | no route | Ground (output stages) | — | |
| W6 | OEM-X-55 | SP-GND-1 | 0.85 | no route | Ground (ignition) | — | |
| W7 | OEM-X-6 | SP-GND-1 | 0.85 | no route | Ground (injector output stages) | — | |
| W8 | SP-GND-1 | T4-C1-13 | 0.85 | no route | Power Ground 1 | — | |
| W9 | SP-GND-1 | T4-C1-14 | 0.85 | no route | Power Ground 2 | — | |
| W10 | OEM-X-28 | SP-0V-1 | 0.5 | no route | Ground (electronics + sensor shielding) | — | |
| W11 | OEM-X-40 | SP-0V-1 | 0.5 | no route | O2 sensor signal ground | — | |
| W12 | OEM-X-43 | SP-0V-1 | 0.5 | no route | Crank position sensor (-) | — | |
| W13 | OEM-X-44 | SP-0V-1 | 0.5 | no route | Sensor ground (IAT/ECT/TPS) | — | |
| W14 | OEM-X-71 | SP-0V-1 | 0.5 | no route | Knock sensor ground/shield | — | |
| W15 | SP-0V-1 | T4-C2-21 | 0.5 | no route | Sensor Ground | — | |
| W16 | SP-0V-1 | T4-C2-33 | 0.5 | no route | Sensor Ground | — | |
| W17 | OEM-X-59 | T4-C2-24 | 0.5 | no route | +5V sensor supply | — | |
| W18 | OEM-X-16 | T4-C2-12 | 0.5 | no route | Crank position sensor (+) | — | |
| W19 | OEM-X-17 | T4-C2-22 | 0.5 | no route | Camshaft position sensor (Hall) | — | |
| W20 | OEM-X-50 | T4-C1-10 | 0.5 | no route | Ignition coil cylinder 1 | — | |
| W21 | OEM-X-51 | T4-C1-18 | 0.5 | no route | Ignition coil cylinder 2 | — | |
| W22 | OEM-X-52 | T4-C1-1 | 0.5 | no route | Ignition coil cylinder 3 | — | |
| W23 | OEM-X-23 | T4-C1-26 | 0.5 | no route | Ignition coil cylinder 4 | — | |
| W24 | OEM-X-33 | T4-C1-9 | 0.5 | no route | Injector cylinder 1 | — | |
| W25 | OEM-X-32 | T4-C1-17 | 0.5 | no route | Injector cylinder 2 | — | |
| W26 | OEM-X-31 | T4-C1-34 | 0.5 | no route | Injector cylinder 3 | — | |
| W27 | OEM-X-5 | T4-C1-25 | 0.5 | no route | Injector cylinder 4 | — | |
| W28 | OEM-X-3 | T4-C1-9 | 0.5 | no route | Injector cylinder 5 | — | |
| W29 | OEM-X-4 | T4-C1-17 | 0.5 | no route | Injector cylinder 6 | — | |
| W30 | OEM-X-1 | T4-C1-5 | 0.5 | no route | Fuel pump relay control | — | |
| W31 | OEM-X-27 | T4-C1-4 | 0.5 | no route | Main relay control | — | |
| W32 | OEM-X-41 | T4-C2-10 | 0.5 | no route | Mass air flow (MAF) signal | — | |
| W33 | OEM-X-73 | T4-C2-1 | 0.5 | no route | Throttle position (TPS) | — | |
| W34 | OEM-X-78 | T4-C2-7 | 0.5 | no route | Engine coolant temperature (ECT) | — | |
| W35 | OEM-X-38 | T4-C3-9 | 0.5 | no route | O2 sensor heater relay control | — | |
| W36 | OEM-X-2 | T4-C1-3 | 0.5 | no route | Idle speed control valve (close winding) | — | |
| W37 | OEM-X-29 | T4-C3-22 | 0.5 | no route | Idle speed control valve (open winding) | — | |
| W38 | OEM-X-36 | T4-C3-23 | 0.5 | no route | Evap purge solenoid | — | |
| W39 | OEM-X-7 | T4-C3-24 | 0.5 | no route | VANOS intake camshaft solenoid | — | |
| W40 | OEM-X-8 | T4-C3-25 | 0.5 | no route | Check engine light (MIL) | — | |
| W41 | OEM-X-47 | T4-C3-10 | 0.5 | no route | Tachometer output | — | |
| W42 | OEM-X-13 | T4-C2-5 | 0.5 | no route | O2 sensor signal | — | |
| W43 | OEM-X-77 | T4-C2-25 | 0.5 | no route | Intake air temperature (IAT) | — | |
| W44 | OEM-X-42 | T4-C2-2 | 0.5 | no route | Vehicle speed signal | — |
Bill of materials
| Category | Part number | Manufacturer | Description | Qty | Unit |
|---|---|---|---|---|---|
| connector | 4-1437290-0 | TE | Superseal 1.0 34-way plug, Key 1 | 3.000 | ea |
| connector | BMW-E36-DME-CONN | BMW | E36 DME (M3.1/M3.3.1) harness connector | 1.000 | ea |
| terminal | 3-1447221-4 | TE | Superseal 1.0 socket terminal, 20 AWG (0.5 sq mm) | 32.000 | ea |
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 |
|---|---|---|---|
| error | NET_MERGED | OEM-X-3 + OEM-X-33 + T4-C1-9 | 2 different OEM functions share one net: OEM-X-3 Injector cylinder 5; OEM-X-33 Injector cylinder 1 |
| error | NET_MERGED | OEM-X-32 + OEM-X-4 + T4-C1-17 | 2 different OEM functions share one net: OEM-X-32 Injector cylinder 2; OEM-X-4 Injector cylinder 6 |
| error | PHYS_REQUIRED_OPEN | T4-C3-27 | T4-C3-27 "Permanent 12v" is required but not wired. |
| error | REQUIRED_UNMAPPED | OEM-X-24 | Required OEM function "Ignition coil cylinder 6" (ignition_out) is not connected to the new ECU. |
| error | REQUIRED_UNMAPPED | OEM-X-25 | Required OEM function "Ignition coil cylinder 5" (ignition_out) is not connected to the new ECU. |
| warn | DATASET_GAP | T4+ C1 | 18 of 34 cavities on T4+ C1 have no pin data (2,8,11,12,15,16,19,20,21,22,23,24,27,28,29,30,32,33). Anything there is invisible to these checks. |
| warn | DATASET_GAP | T4+ C2 | 11 of 34 cavities on T4+ C2 have no pin data (8,11,13,18,20,23,27,29,30,31,32). Anything there is invisible to these checks. |
| warn | DATASET_GAP | T4+ C3 | 20 of 34 cavities on T4+ C3 have no pin data (1,2,3,4,5,6,13,14,15,16,19,20,21,28,29,30,31,32,33,34). Anything there is invisible to these checks. |
| info | NET_FAMILY | OEM-X-47 ↔ T4-C3-10 | OEM-X-47 "Tachometer output" [tacho_out] is wired to T4-C3-10 "PWM 8" [low_side_out]. Tacho as a low-side output: check the tach needs a pull-up. |
| info | UNMAPPED | OEM | 4 optional OEM pins are not mapped: OEM-X-45 Shield ground; OEM-X-56 Ignition switch (terminal 15); OEM-X-69 Knock sensor cylinders 4-6; OEM-X-70 Knock sensor cylinders 1-3 |
Accepted (0)
| Code | Subject | Reason | By |
|---|
Notes
Auto-mapped by auto_map() from the library pin data on 2026-10-11. Review every wire against both manuals before building. Open items: - OEM-X 25: Ignition coil cylinder 5: no free ignition output on DTAFast T4+ - OEM-X 24: Ignition coil cylinder 6: no free ignition output on DTAFast T4+ - T4-C3 27: Permanent 12v: required by DTAFast T4+ but no stock pin feeds it; wire by hand Not wired: - OEM-X 70: Knock sensor cylinders 1-3: no free knock input on DTAFast T4+ - OEM-X 69: Knock sensor cylinders 4-6: no free knock input on DTAFast T4+ - OEM-X 45: Shield ground: no shield pin on DTAFast T4+ - OEM-X 56: Ignition switch (terminal 15): key-on 12 V sense — optional in a swap (the main relay is energized from keyed 12 V, not from this pin); DTAFast T4+ has no dedicated key-on input
Sources
| Reliability | Kind | Title | URL | Archive | Captured | SHA-256 |
|---|---|---|---|---|---|---|
| 4 | vendor_doc | DTAFast T4+ ECU wiring diagram | https://cdn.shopify.com/s/files/1/0848/7508/4108/files/T4PLUS_Wiring_Diagram.pdf?v=1789412534 | — | — | — |
| 4 | vendor_doc | Link BMWLink E36X (G4X) plug-in install manual | https://linkecu.com/documentation/E36X.pdf | archive | 2026-10-05 | 010cda3acd08 |
| 2 | community_copy | bimmer-service: Bosch Motronic M3.3.1 pinout (E36 M50) | https://www.bimmer-service.com/2025/11/17/bosch-motronic-m3-3-1-pinout-wiring-diagram/ | — | — | — |