Checking wires to Engine Control Module (ECM)
WARNING: This page is about a different car, the 2009 Audi A8, 2008 Audi A8, 2007 Audi A8, 2006 Audi A8, and 2005 Audi A8. However, it is still accessible from the selected car via links, so may be relevant.
Cylinder bank 1
- Connect test box to Engine Control Module (ECM) J623 wiring harness on connecting test box for wiring test.
Cylinder bank 2
- Connect test box to Engine Control Module (ECM) 2 J624 wiring harness on connecting test box for wiring test.
Cylinder bank 1 and 2
- Check wires between test box and 3-pin connector to Engine Control Module (ECM) for open circuit according to wiring diagram. Wiring resistance: max. 1.5 Ω
Cylinder bank 1
| Component | Connector | Test box |
|---|---|---|
| Camshaft Position (CMP) Sensor G40 | Terminal 1 | Socket 98 |
| Terminal 2 | Socket 86 | |
| Terminal 3 | Socket 108 |
| Component | Connector | Test box |
|---|---|---|
| Camshaft Position (CMP) Sensor 3 G300 | Terminal 1 | Socket 98 |
| Terminal 2 | Socket 87 | |
| Terminal 3 | Socket 108 |
Cylinder bank 2
| Component | Connector | Test box |
|---|---|---|
| Camshaft Position (CMP) Sensor 2 G163 | Terminal 1 | Socket 98 |
| Terminal 2 | Socket 86 | |
| Terminal 3 | Socket 108 | |
| Camshaft Position (CMP) Sensor 4 G301 | Terminal 1 | Socket 98 |
| Terminal 2 | Socket 87 | |
| Terminal 3 | Socket 108 |
Cylinder bank 1 and 2
- Check wires for short circuit to each other. Specification: ∞ Ω
- Erase DTC memory of Engine Control Module (ECM) → Diagnostic Mode 04 - Erase DTC Memory , Diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code → Readiness Code, Generating .
If no malfunction is found in the wires and there was voltage between terminals 1 + 3:
- Replace respective camshaft position sensor .
- Erase DTC memory of Engine Control Module (ECM) → Diagnostic Mode 04 - Erase DTC Memory , Diagnostic mode 4: Reset/erase diagnostic data.
- Generate readiness code → Readiness Code, Generating .
If no malfunction is found in the wires and there was no voltage between terminals 1 and 3:
Cylinder bank 1
- Replace Engine Control Module (ECM) J623 → Safety Precautions .
Cylinder bank 2
- Replace Engine Control Module (ECM) 2 J624 → Safety Precautions .