Ignition Coils, Checking

Ignition coils, checking

NOTE: The ignition coil and the output stage are combined in a common component.

Test conditions
- No DTCs relating to injector(s) stored
Identify an inoperative or misfiring cylinder as follows:
- Disconnect connectors from injectors in sequence with engine running, and observe how engine runs.
or
- Compare spark plugs of all cylinders with each other and check for soot on electrodes.

If the faulty cylinder has been identified:
- Replace spark plug of faulty cylinder with one from another cylinder.

If the malfunction moves with the spark plug:
- Replace spark plug.

If the malfunction remains in the same cylinder:

- Replace ignition coil from faulty cylinder with one from another cylinder.
- If malfunction now occurs at other cylinder, replace ignition coil.

If the malfunction remains on the cylinder, check Ground wiring of the ignition coil.

Checking the Ground connection for the ignition coil:

- Disconnect 4-pin connector from relevant ignition coil.







- Check Ground connection from socket 4 on 4-pin connector to engine Ground for open circuit or short to positive.
- Correct any open/short circuit as necessary.

If the Ground connection is OK: Check supply voltage for ignition coil.

Checking the power supply to the ignition coil:







- Connect hand-held multimeter to following socket on connector to measure voltage:

4-pin connector on wiring harness, socket Specified value
1 + Ground Battery voltage

- Operate starter.

Specified value: approx. battery voltage

If specified value is not attained:
- Check wiring from socket 1 via fuse to fuel pump relay for continuity, repair, if necessary.

If the specified value is achieved:
- Check performance output stage. Ignition Coils With Power Output Stages, Checking