Without - BMW DIAGNOSTIC SYSTEM

Fig. 4 "Check Engine" Light Code Display:

ENTERING SELF-DIAGNOSTICS
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.

^ tR = 5 sec. preparation for read-out
^ tWS = 0.5 sec. wait for synchronization
^ t1 = 2.5 sec. additional check engine lamp check
^ t2 = 2.5 sec. wait for read-out
^ t3 = 0.5 sec. check engine lamp on
^ t4 = 0.5 sec. check engine lamp off
^ t5 = 2.5 sec. time between code digits
^ t6 = 2.5 sec. time between different codes

3. Read and record all fault codes that are displayed.

NOTE: To achieve good mid-range torque characteristics, long air intake pipes are used. This method of induction requires that the plenum chamber for the left bank (cylinders 7-12) be mounted on the right side of the engine, and the plenum for the right bank (cylinders 1-6) be mounted on the left side of the engine. The technician must keep this in mind when referring to component locations and testing procedures. Components such as air intake sensors, air mass sensors, injectors, throttle position motors and induction systems may be misdiagnosed because of possible confusion. Remember that fault codes will always refer to the DME system (DME system 1 = cyl. 1-6) and (DME system 2 = cyl. 7-12).