12 13 009 Checking Ignition Coils (Secondary Coil)

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2006 BMW M3, 2005 BMW M3, 2004 BMW M3, 2003 BMW M3, and 2002 BMW M3. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

For Special Tool identification, see SPECIAL TOOLS - M3 .

Special Tools Required:

12 7 040
12 7 041
12 7 042
12 7 043
12 7 045
12 7 046
12 7 050

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

IMPORTANT: Observe safety precautions, refer to 12 00 ... INFORMATION ON WORKING ON IGNITION SYSTEM , DISCONNECTING AND CONNECTING TEST EQUIPMENT and 12 00 ... INSTRUCTIONS ON COMPONENT INSPECTION . Switch off ignition.

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

Secondary voltage check, refer to 12 13 ... CHECKING SECONDARY SIGNAL FOR STATIONARY IGNITION DISTRIBUTION .
Comparison between ignition coils from different manufacturers, refer to OSCILLOGRAMS OF IGNITION COILS FROM DIFFERENT MANUFACTURERS .
Ignition coil faults, refer to IGNITION COIL FAULTS .
Spark plug faults, refer to SPARK-PLUG FAULTS .
Injection system faults, refer to 12 13 ... FAULT IN FUEL INJECTION SYSTEM .

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 12 7 043 (Connecting Cable)

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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: Identifying Special Tool 12 7 041 And 12 7 045

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Remove cover for ignition coils.

Version With Single-Spark Ignition Coils:

Mount special tool 12 7 041 on ignition coils and connect to special tool 12 7 043.

Fig 4: View Of 12 7 041 On Ignition Coils

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Connect DIS Tester with RZV connecting lead to last test adapter (RZV = static ignition distribution).

Connect trigger pliers of DIS tester to feed line on ignition coil of 1st cylinder.

Select "Measurement".
Select "Preset measurements".

Subsequent procedure in accordance with DIS instructions.

Fig 5: Connecting DIS Tester To Feed Line On Ignition Coil

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Version With Rod-Type Ignition Coils:

Unlock plug on rod-type ignition coil and disconnect.

Remove rod-type ignition coil, connect special tool 12 7 050 (adapter cable) to spark plug and ignition coil, connect ignition coil to engine wiring harness.

Carry out measurements following DIS instructions.

Fig 6: Connecting Adapter Cable To Spark Plug And Ignition Coil

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Version With Ignition Coil Block:

Raise cover on ignition coil block slightly and fit special tool 12 7 046.

Connect special tool 12 7 046 to adapter cable 12 7 042 and then to Tester.

Fig 7: Fitting Special Tool 12 7 046 On Ignition Coil Block

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NOTE: The adapter cable 12 7 042 is located in the case of the adapter kit 12 7 040. Follow instructions for troubleshooting with aid of adapter kit:

Normal oscillogram MG12, refer to NORMAL OSCILLOGRAM (M, S, W ENGINES ONLY) .
Ignition coil comparison MG12, refer to OSCILLOGRAMS OF IGNITION COILS FROM DIFFERENT MANUFACTURERS .
Ignition coil fault MG12, refer to IGNITION COIL FAULTS .
Spark plug G12, refer to SPARK-PLUG FAULTS .
Further fault patterns MG12, refer to FURTHER FAULT PATTERNS WITH EVALUATION .
Fault at injection system MG12, refer to 12 13 ... FAULT IN FUEL INJECTION SYSTEM .