Without - BMW DIAGNOSTIC SYSTEM

Fig. 63 Fault code example:

The DME unit recognizes exhaust related faults and displays this by lighting up the "Check Engine" light continuously.

NOTE: The "Check Engine" comes on when the ignition is turned on, and goes out when the engine starts. It remains on continuously while the engine is running only if there is a fault.

Faults can be pin pointed and eliminated with the help of a flash code.

To activate the light in the output mode (flash code):

1. Switch the ignition to the run (ON) position.

2. Depress the accelerator pedal five (5) times to the wide open throttle position within five (5) seconds to display flash codes for DME control unit 1. The accelerator pedal must be depressed six (6) times to display the flash codes for DME control unit 2.

NOTE: Since the BMW V12 engine uses two independent DME control units, fault codes and procedures must be followed for the specific system. DME system 1 fault codes affect cylinders 1-6. DME system 2 fault codes affect cylinders 7-12.

3. Read and record any flash codes that are displayed.