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Engine control unit with antitheft protection: Removing and installing, engine code BMS > < Engine control unit: Removing and installing

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Engine control unit with antitheft protection: removing and fitting, engine codes AMF, BNM, BNV
Engine control unit with antitheft protection: removing and fitting, engine codes AMF, BNM, BNV
Special tools and workshop equipment required
   
t  Hot-air blower from wiring harness repair set -VAS 1978-
t  Coupling nozzle of the wiring harness repair set -VAS 1978-
To replace the engine control unit, connect the → Vehicle diagnostic, testing and information system VAS 5051 and initiate the guided function „Replacing control unit“.
Removal:
–  Remove the windscreen wiper arms and the windscreen trim of the plenum chamber cover: → Electrical system; Rep. gr.92
  Note
The thread on the breakaway bolts has been treated with a threadlocker. The effect of the threadlocker is reduced by heating the breakaway bolts with a hot air gun.
  Caution
Cover the brake hose and the cable that lead to the brake fluid container to prevent damage being caused to it.
Carry out the adjustments on the hot air blower -4- as described below:
  W00-0447
–  Turn temperature setting potentiometer -2- to maximum heat output (600 °C).
–  Set the two-level switch for air flow -3- to position 3.
  WARNING
When heating the headless bolts, other components of the protective shell are also heated considerably. Wear protective gloves to avoid burns.
–  Bring the opening of the hot-air gun up to the breakaway bolt on the lock.
–  Connect the hot air blower and heat the bolt for approx. 20 to 25 seconds.
–  Screw out the breakaway bolts on the bolt head using a pliers.
The procedure for the second headless bolt is the same.
–  Press the clips on the protective casing in the plenum chamber together and hook-off on the spray wall.
–  Remove the protective casing from the engine control unit.
–  Unlock the engine control unit connectors and pull them off.
Installing
–  Fit plug connectors and lock in position.
–  Push protective housing over engine control unit.
–  Install the cover for protective housing using new shear-head bolts.
–  Tighten the headless bolts evenly, until the bolt heads break off.
–  Mount the protective casing to the spray wall and press the clips together so that they are engaged in the openings.
–  Install windscreen wiper arms and plenum chamber cover → Electrical system; Rep. gr.92.
–  When replacing the engine control unit, erase the self adapting values and adapt to the engine control unit → Vehicle diagnostic, testing and information system VAS 5051„Guided function“
–  Consult fault memory; if necessary, repair any faults and then erase fault memory → Vehicle diagnostic, testing and information system VAS 5051„guided fault finding“
–  If the fault memory has been erased, you must generate the readiness code again.
–  Take vehicle for a test drive.
–  Again read control unit fault memory.
  A24-0476

Engine control unit with antitheft protection: Removing and installing, engine code BMS > < Engine control unit: Removing and installing