Diagnostic Aids

Check for any of the following conditions:

• Any circuit malfunction between the ignition coil assembly and the PCM should set a fail safe circuit DTC P1300, P1305, P1310, or P1315.
• Check the Crankshaft Position (CKP) sensor engine reference signal with a scan tool. Observe the Engine Speed parameter while cranking the engine. The scan tool should indicate a steady 200-300 RPM while cranking. If erratic values, such as sudden spikes in the engine speed, are displayed, the engine reference signal is not stable enough for dependable ignition system operation.
• An ignition system that tests OK after sitting may be susceptible to moisture. Spray water on the ignition system components and wiring in order to check for an intermittent failure.