12 51 001 Replacing wiring harness section for engine (N14)
WARNING: This page is about a different variant/trim than selected.
IMPORTANT:
Read and comply with notes on protection against ELECTRO STATIC DISCHARGE
.
IMPORTANT:
Gaiter and charge-air hoses with clamp fastenings must be installed dry and free from grease!
Sealing faces and fittings must be dry and free from grease.
If gaiter and charge-air hoses with clamp fastenings are not installed dry and free from grease, this may result in turbocharger failure!
Necessary preliminary tasks:
- Read out fault memory of DME control unit
- Switch off ignition
- Clamp off battery negative lead. See 61 00... Instructions for disconnecting and connecting battery
- Remove INTAKE AIR MANIFOLD
- Remove SOUND GENERATOR
- Remove right engine mount. See 22 11 001 REPLACING RIGHT ENGINE MOUNT .
Unlock and remove cover (1).
Unlock the two rear plugs (1) and disconnect.
Release clamps (2).
Detach gaiter (3) and remove.
Remove intake pipe (4).
Installation:
Install gaiter (3) dry and free from grease.
Fitting on turbocharger must be dry and free from grease.
Unlock and detach plugs (1 and 3).
Unlock and detach vacuum line (2).
Carefully detach cable duct (4) upwards slightly from holder.
WIRING HARNESS REPLACEMENT PROCEDURE CHART
| Work step | Note: |
|---|---|
| Unlock plug for coolant temperature sensor and disconnect | |
| Unlock PLUGS FOR IGNITION COILS and disconnect | |
| Disconnect ground connection at cylinder head | Tightening torque 12 51 1AZ |
| Unlock plug for control sensor and disconnect | |
| Unlock plug for electric valve on turbocharger and disconnect | |
| Unlock plug for supplementary coolant pump and disconnect | |
| Unlock plug for monitor sensor and disconnect | |
| Unlock plug for coolant thermostat and disconnect | |
| Unlock plug for high-pressure pump and disconnect | |
| Unlock plug for high-pressure sensor and disconnect | |
| Unlock plug for knock sensor and disconnect | |
| Unlock plug for crankshaft sensor and disconnect | |
| Unlock plugs for injectors and disconnect | |
| Unlock plug for solenoid valve and disconnect | |
| Unlock plugs for temperature and boost pressure sensors and disconnect | |
| Unlock plug for friction gear and disconnect |
NOTE:
Check stored fault messages.
Now clear the fault memory.