Checking Ignition Coils (Secondary Coil)

Checking Ignition Coils (Secondary Coil)

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







NOTE:
The following checks can be carried out with the adapter kit:
- Secondary voltage check
- Comparison between ignition coils from different manufacturers
- Ignition coil faults
- Spark plug faults
- Injection system faults


Important: Observe safety precautions.







Connect special tool 12 7 043 (connecting cable) to special tool 12 7 041 (single adapter).







Special tool 12 7 041 (single adapter) for fitting onto ignition coil.


NOTE: Also use special tool 12 7 045 when carrying out checks on compact ignition coils (e.g. M43).


Remove cover for ignition coils.







Observe safety precautions!
Switch off ignition.
Firing sequence 1-5-3-6-2-4.







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







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.







On vehicles with rodent protection:
Representation on M43.
Detach ignition cable of cylinder 1 from spark plug and mount special tool 12 7 030 between ignition cable of cylinder 1 and spark plug. Do not connect ground cable.
Connect trigger pliers of DIS Tester to special tool 12 7 030.







E36/7, E46 with S54, E4615 with N42
Unlock plug on rod-type ignition coil and detach.
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.







E36/5, E36/7, E46 with M43TU
Connect special tool 12 7 046 to adapter cable 12 7 042 and then to Tester.


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
- Ignition coil comparison MG12
- Ignition coil fault MG12
- Spark plug fault MG12
- Further fault patterns MG12
- Fault at injection system MG12