Preliminary Procedures

Carry out secondary voltage check using test adapter 12 7 040.

IMPORTANT: Observe safety precautions.

Switch off ignition.

NOTE: The following checks can be carried out with the adapter kit:

Secondary voltage check. See Figure -Figure .
Comparison between ignition coils from different manufacturers. See OSCILLOGRAMS OF IGNITION COILS FROM DIFFERENT MANUFACTURERS .
Ignition coil faults IGNITION COIL FAULTS
Spark plug faults SPARK-PLUG FAULTS
Injection system faults

Fig 1: Identifying Adapter Kit
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Connect special tool 12 7 043 (connecting cable) to special tool 12 7 041 (single adapter).

Fig 2: Identifying Special Tool

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NOTE: Checks on engines with single-spark ignition coils:

Special tool 12 7 041 (single adapter) in conjunction with special tool 12 7 045 for fitting onto ignition coil.

Fig 3: Checking Engines With Single-Spark Ignition Coils

Courtesy of BMW OF NORTH AMERICA, INC.

Remove cover for ignition coils.