Test requirement

• No malfunction regarding fuel injector(s) stored

Recognize a non-functional or misfiring cylinder as follows:

• Disconnect connectors from fuel injectors in sequence with engine running and observe engine operation.

  Or

• Compare spark plugs of all cylinders to each other. Check electrodes for carbon fouling.

If faulty cylinder is recognized:

• Switch spark plug from faulty cylinder with one from another cylinder.

If malfunction follows the spark plug:

• Replace spark plug.

If malfunction remains at original cylinder:

• Switch spark plug from faulty cylinder with one from another cylinder.
• If a malfunction now occurs at other cylinder, replace the ignition coil.

If malfunction remains at the cylinder, check Ground (GND) wire of ignition coil.