Test Description

The numbers below refer to the step numbers in the diagnostic procedures.

1. 1  - The Diagnostic System Check - Engine Controls prompts the technician to complete some basic checks and store freeze frame data, if applicable. This creates an electronic copy of data taken when fault occurred. Information is then stored in the scan tool for later reference.
2. 2  - If DTCs P1300, P1305, P1310, and P1315 are present, fault is located in the shared electrical circuits or shared components of the ignition coils.
3. 3  - If there is no engine misfire present, there is a fault in Ignition Fail-Safe Input signal circuit.
4. 4  - DTC P1300 indicates a failure in the circuits of ignition coil 1. DTC P1305 indicates a fault with ignition coil 2. DTC P1310 indicates a fault with ignition coil 3. DTC P1315 indicates a fault with ignition coil 4.
5. 5  - This step tests for an open or a short in the ignition trigger signal circuit. Voltage on the ignition trigger signal circuit will fluctuate very quickly when starting or running the engine. DMM voltage reading on the ignition trigger signal circuit should indicate 0.2-1.0 volt. Using min/max feature on DMM may indicate a maximum voltage as high as 3.5 volts.
6. 11  - This step tests for a fault in the Ignition Fail-Safe input circuit. If the cause of DTCs P1300, P1305, P1310, and P1315 is a fault in the ignition fail-safe input circuit, the engine will start and run for less than 2 seconds. Without fail-safe signal, PCM will initiate fuel cutoff.
7. 13  - This step tests for a short in the ignition positive voltage supply to the ignition coils or for a faulty noise filter. A shorted noise filter may pull down ignition coil primary voltage.