12 51 001 Replacing Wiring Harness Section for Engine

12 51 001 Replacing wiring harness section for engine (N14, N16)







IMPORTANT: Read and comply with notes on protection against electrostatic discharge (ESD protection).







IMPORTANT:
Gaiter and charge air hoses with clamp fastenings must be installed dry and free from grease.
Sealing surfaces and connecting branches 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 exhaust turbocharger failure.







Necessary preliminary tasks:
- Read out the fault memory of the DME control unit.
- Switch off ignition.
- Disconnect battery earth lead.
- Remove intake plenum.
- Remove sound generator.







Unlock and remove cover (1).







Unlock and detach the two rear connectors (1).







Release clamps (2).
Pull off gaiter (3) and remove it.
Remove intake pipe (4).

Installation note:
Install gaiter (3) dry and free from grease.
Connecting branch on exhaust turbocharger must be dry and free from grease.







Unlock and pull off connectors (1 and 3).
Unlock and detach vacuum line (2).
Carefully pull cable channel (4) upward away from the holder.

Work step
Unlock and pull off connector for coolant temperature sensor.
Unlock and pull off connector for ignition coils
Release ground connection from cylinder head
Unlock and pull off connector for control sensor
Unlock and pull off connector for electric valve from exhaust turbocharger
Unlock and pull off connector for auxiliary water pump
Unlock and pull off connector for monitoring sensor
Unlock and pull off connector for coolant thermostat
Unlock and pull off connector for high pressure pump
Release connector for high pressure sensor and remove.
Unlock and pull off connector for knock sensor
Unlock and pull off connector for crankshaft sensor
Unlock and pull off connector for injectors
Unlock and pull off connector for solenoid valve
Unlock and pull off connector for temperature and charging pressure sensor
Unlock and pull off connector for friction wheel

Note
N14
Tightening torque 12 51 1AZ.







NOTE:
Check stored fault messages.
Delete fault memory.