12 51 235 Replacing the engine sensor system module 1 wiring harness section (B46, B48)
Attention!
Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DISCHARGE (ESD PROTECTION) !
Necessary preliminary work:
- Disconnect NEGATIVE BATTERY LEAD
- Remove FAN COWL
- Remove front UNDERBODY PROTECTION
- Remove INTAKE PLENUM
- Remove UPPER BULKHEAD COVER
- Remove STRUT BRACE
Removal:
Release expanding rivet (2).
Undo the bolt (1) and remove the cover (3).
Loosen screw (1).
Lay the cover (2) of the positive battery connection point to one side.
Release the screws along the arrows and remove the tension strut (1).
Unlock and remove cover (1).
Unlock and pull off all connectors (1) in the direction of arrow at the control unit.
Unlock the lock (2) and release the cable clip (1) and place to one side.
Release the cable clip (2) from cover (1) and lay to one side.
Feed out cover (1) and remove.
Overview of engine sensor system module 1 wiring harness section
| Unlock and disconnect following connectors and lines | Note |
|---|---|
| Unlock and disconnect connector from DME control unit | |
| Unlock and disconnect connector from knock sensor | |
| Unlock and disconnect connector from charging pressure sensor on intake plenum | |
| Unlock and disconnect connector from throttle valve | |
| Unlock and disconnect connector from charging pressure sensor upstream of throttle valve | |
| Unlock connector on crankshaft sensor and disconnect | |
| Unlock and disconnect connector from gear sensor | |
| Unlock connector on oil pressure sensor and disconnect | |
| Unlock connector on solenoid valve and pull off. | |
| Unlock connector on air conditioning compressor and disconnect | |
| Unlock and disconnect connector from thermostat | |
| Unlock connector on coolant temperature sensor and disconnect | |
| Unlock connector on tank vent valve and disconnect | |
| Unlock connector on oil level sensor and disconnect |
Release wiring harness from clips and retainers.
Feed out wiring harness and remove.
Installation:
Route and install wiring harness.
Plug in all connectors as specified in table.
All connectors must audibly engage.
Connect all connectors (1) at the control unit in the direction of arrow.
All connectors (1) must engage audibly.
Lock the cover (1) in the lock (2).
Lock (2) must snap audibly into place.
Feed in and install the cover (1).
Attach the cable clip (2) to the cover (1).
Feed in the cable clip (1) and lock it in the lock (2).
Install the tension strut (1) and tighten the screws along the arrows.
Tightening torque 17 10 8AZ .
Install the cover (2) of the positive battery connection point.
Tighten screw (1).
Tightening torque 17 10 10AZ .
Install the cover (3) and tighten the screw (1).
Tightening torque 17 10 10AZ .
Install expanding rivet (2).
Required reworking:
- Install FAN COWL
- Install UPPER BULKHEAD COVER
- Install UNDERBODY PROTECTION
- Install INTAKE PLENUM
- Install the STRUT BRACE
- Connect NEGATIVE BATTERY LEAD