IMPORTANT: Read and comply with notes on protection against electrostatic damage (ESD protection).
Necessary preliminary tasks:
IMPORTANT: Follow instructions for removing and installing electronic control units.
Replacement:
IMPORTANT: It is absolutely essential to read out the fault memory with the MoDiC or the BMW DIS and to create a fault memory printout.
Switch off ignition.
Lever out expander rivet.
Remove gasket (1).
Release screws (2).
Feed out partition (3) and remove.
Fig. 24: Identifying Expander Rivet Gasket And Screws
Lever out expander rivet.
Release locks in direction of arrow.
Feed out fresh air duct (1) and remove.
Fig. 25: Removing Fresh Air Duct
Open retainers.
Release lock (1) in direction of arrow.
Remove cover (2).
Fig. 26: Locating Retainers Lock And Cover
Release screws and remove retaining bar (1).
Unlock upper section (2) of partition seal in direction of arrow and remove.
Release grommets (3) for wiring harnesses from lower section of partition seal and from electronics box.
Installation:
Make sure grommets are correctly seated (watertightness).
Fig. 27: Unlocking Upper Section Of Partition Seal
Unlock plugs (1) using slide in direction of arrow and remove. Remove control unit (2).
Installation:
Replacement: Note device identification number and coding.
Fig. 28: Identifying DME Control Unit
NOTE: Check stored fault messages. Now clear the fault memory.
REMOVING/REPLACING KNOCK SENSORS (N52, N52K, N51)
IMPORTANT: Aluminum-magnesium materials.
No steel screws/bolts may be used due to the threat of electrochemical corrosion.
A magnesium crankcase requires aluminum screws/bolts exclusively.
Aluminum screws/bolts must be replaced each time they are released.
The end faces of aluminum screws/bolts are painted blue for the purposes of reliable identification.
Jointing torque and angle of rotation must be observed without fail (risk of damage).
Necessary preliminary tasks:
IMPORTANT: Mixing up the knock sensor plug connections will result in engine damage! Routing of wires and plug connections must conform to the original routing.
This eliminates the risk of confusion and mix-ups.
Release screws on both knock sensors. Remove knock sensors (1).
Installation:
Replace aluminum screws.
Tightening torque 12 14 1AZ.
Fig. 29: Identifying Knock Sensors
Installation:
Clean support face of knock sensors on engine block.
NOTE: Check stored fault messages.
Now clear the fault memory.
CODING CONTROL MODULE (DME / DDE)
Switch off ignition.
Connect MoDiC or DIS/GT1 Tester.
Switch on ignition.
Select "Coding" program.
For subsequent procedure, follow instructions in MoDiC or DIS/GT1 Tester.
Carry out adjustment of following control units:
Refer to "Diagnosis and Coding" service information bulletins on subject of coding.
PROGRAMMING CONTROL UNIT (DME / DDE)
Switch off ignition.
Connect MoDiC or DIS/GT1 Tester.
Switch on ignition.
Select "Programming".
For subsequent procedure, follow instructions in MoDiC or DIS/GT1 Tester.
Carry out adjustment of following control units:
Refer to "Diagnosis and Coding" service information bulletins on subject of programming.
REMOVING AND INSTALLING/REPLACING ELECTRONICS BOX
IMPORTANT: Read and comply with notes on protection against electrostatic damage (ESD protection).
NOTE: Follow instructions for removing and installing electronic control
Necessary preliminary tasks:
Pull rubber grommets out of electronics box. Disconnect all plug connections.
Release screws (arrows).
Disconnect wiring harness on engine compartment side on right.
Remove electronics box.
Installation:
Make sure gasket (1) is correctly seated on electronics box. Add final details to vehicle.
Read fault memory.