12 51 235 Removing and installing/replacing engine sensor system module 1 wiring harness (N20)
IMPORTANT:
Read and comply with notes on PROTECTION AGAINST ELECTROSTATIC DISCHARGE (ESD PROTECTION)
.
Necessary preliminary tasks:
- Read out the fault memory of the DME control unit.
- Switch off ignition.
- Remove intake PLENUM .
- Only vehicles with automatic transmission and rear-wheel drive:
Release TRANSMISSION OIL COOLER and place on its side, do not disconnect the lines.
- All-wheel drive vehicles only:
Remove STIFFENING PLATE
Overview, engine sensor system wiring harness module 1.
| Unlock and disconnect following connectors and lines |
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| Unlock connector on charging pressure sensor and disconnect |
| Unlock connector on hot film air mass meter and disconnect |
| Unlock connector on intake pressure sensor and disconnect |
| Unlock connector on oxygen sensor and disconnect |
| Unlock connector on monitoring sensor and disconnect |
| Unlock connector on pressure converter and disconnect |
| Unlock connector on high-pressure fuel sensor and disconnect |
| Unlock connector on tank vent valve and disconnect |
| Unlock connector on starter motor and disconnect |
| Unlock connector on both knock sensors and disconnect |
| Release connector on oil pressure/temperature sensor and disconnect |
| Unlock connector on fuel low-pressure sensor and disconnect |
| Unlock connector on throttle body and disconnect |
| Unlock connector on high pressure pump and disconnect |
| Unlock connector on alternator and disconnect |
| Unlock connector on air conditioning compressor and disconnect |
| Unlock connector on oil level sensor and disconnect |
| Unlock connector on crankshaft sensor and disconnect |
| Unlock connector on heating element for air duct and disconnect |
| Unlock connector on coolant thermostat and disconnect |
| Unlock connector on hydraulic valve and disconnect |
| Unlock connector on the coolant pump and disconnect |
| Unlock connector on exhaust turbocharger and disconnect |
| Unlock connector on both camshaft adjustment solenoid valves and disconnect |
| Unlock connector on intake camshaft pulse sensor and disconnect |
| Unlock connector on exhaust camshaft pulse sensor and disconnect |
| Unlock connector on oil pressure switch and disconnect |
| Unlock connector on switching motor for eccentric shaft and disconnect |
Release wiring harness if necessary from existing clips and clamps.
Feed out wiring harness and remove.
Installation note:
Check wiring harness installation arrangement.
Check plug connections for correct fit.
Check stored fault message.
Delete fault memory.