Ignition System: Testing and Inspection

ELECTRONIC IGNITION (EI) SYSTEM DIAGNOSIS

CIRCUIT DESCRIPTION
The electronic ignition system uses an individual ignition coil for each cylinder. The powertrain control module (PCM) controls the ignition operation through eight individual ignition control (IC) circuits. Each bank of four ignition coils is connected to the PCM, power, or ground by the following circuits:
- Low reference
- Chassis ground
- Ignition 1 voltage
- The appropriate IC circuit

The PCM triggers an ignition coil by grounding the appropriate IC circuit using information from the crankshaft position (CKP) and camshaft position (CMP) sensors.

TEST DESCRIPTION

Steps 1-8:

Steps 9-18:

Steps 19-26:

The numbers below refer to the step numbers on the diagnostic table.
4. Monitoring the misfire current counters determines if a fault is present.