Diagnostic Aids

Malfunction code will set if misfire has occurred more frequently than allowed during last 200 revolutions, when catalyst temperature is higher than 1742°F (950°C). Also when misfire has occurred more frequently than allowed number of times (2%) during 1000 engine revolutions. Check for following possible problems:

• Vacuum leak in air intake system.
• Faulty Crankshaft Position (CKP) sensor or circuit.
• Faulty ignition circuit.
• Faulty ignition coil or plug wire.
• Faulty spark plug.
• Low engine compression.
• Low or high fuel pressure.
• Faulty fuel injector or circuit.