12 51 001 Replacing Wiring Harness Section for Engine
12 51 001 Replacing Wiring Harness Section For Engine (N63)
IMPORTANT: Read and comply with notes on protection against electrostatic discharge (ESD protection).
Necessary preliminary tasks:
- Read out fault memory of DME control unit
- Turn off ignition
- Disconnect battery negative lead
- Remove right suspension cross-brace
- Remove acoustic insulation for bulkhead on left
- Remove left and right intake filter housings.
- Remove intercooler on left and right
- Remove intake manifold on left and right
- Partially remove wiring harness for ignition and injectors.
- Detach engine oil line from oil sump
Picture shows the left side, the procedure for the right side is identical
Lever expander rivets (1) out of cover (2).
Installation:
If necessary, replace damaged expander rivets.
Make sure holders (3) are correctly seated.
Release screws (1).
Tightening torque 12 90 4AZ.
Release clip (2).
Remove cover (3) from supplementary box.
Disconnect all plugs from carrier plate (1) and release from supplementary electronics box.
Installation:
Make sure rubber grommets are correctly seated (watertightness).
Unclip grommet hold-down device (1).
Release wiring harness (2) from bulkhead.
Unlock plug (3) and remove.
Release screws (1).
Tightening torque 12 90 2AZ.
Remove electronics box cover (2).
Unlock all plugs (1) from control unit and disconnect.
Unclip grommet holding-down element (2) and remove.
Release rubber grommets (3) from electronics box. Lay wiring harnesses to one side.
Installation:
Make sure grommets are correctly seated (watertightness).
Slacken nut (1).
Tightening torque 12 51 1AZ.
Detach ground cable (2).
Release screw (1).
Tightening torque 12 51 2AZ.
Release screws (1).
Tightening torque 12 51 2AZ.
Release wiring harness (2).
Release wiring harness (3) and lay to one side.
Release screw (1).
Tightening torque 12 51 2AZ.
Raise cable duct (2).
Pull off cable duct (1) from cable holder (2) in upward direction.
Cable (3) does not have to be released.
Release screws (1).
Tightening torque 12 51 2AZ.
Raise cable duct (2).
Release screws (1).
Tightening torque 12 51 2AZ.
Release screw (2).
Lay wiring harness (4) to one side.
Release wiring harness (3) and lay to one side.
Unlock and disconnect following plugs and leads
Unlock plug on crankshaft sensor and disconnect
Unlock plug on transmission and disconnect
Unlock plug on oil pressure sensor and disconnect
Unlock plug on right inlet camshaft pulse generator and disconnect
Unlock plug on right exhaust camshaft pulse generator and disconnect
Unlock plug on starter and disconnect
Unlock plug on oil level sensor and disconnect
Unlock plug on left and right air mass sensors and disconnect
Unlock plug on left and right high-pressure fuel pumps and disconnect
Unlock plug on left and right control sensors and disconnect
Unlock plug on left and right monitor sensors and disconnect
Unlock plug on left and right high-pressure fuel sensors and disconnect
Unlock plug on left and right intake air pressure sensors and disconnect
Unlock plug on A/C compressor and disconnect
Unlock plug on left and right knock sensors and disconnect
Unlock plug on left and right charge-air pressure sensors and disconnect
Unlock plug on coolant temperature sensor to coolant pump and disconnect
Unlock plug on coolant thermostat and disconnect
Unlock plug on pressure transducers and disconnect
Unlock plug on left and right throttle valve assemblies and disconnect
Unlock plugs on solenoid valves for camshaft adjustment on left and right and disconnect
Unlock plug on turbocharger coolant pump and disconnect
Unlock plug on turbochargers and disconnect
Unlock plug on alternator and disconnect
Unlock plug on left inlet camshaft pulse generator and disconnect
Unlock plug on left exhaust camshaft pulse generator and disconnect
Unlock plug on low-pressure fuel sensor and disconnect
Unlock plug on coolant pump for intercooler and disconnect
Release wiring harness if necessary from existing clips and retainers
Feed out wiring harness and remove.
Installation:
Check wiring harness routing.
Check plug connections for correct seating.
Check stored fault message.
Delete fault memory.
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