Ignition System Diagnosis
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 six ignition control (IC) circuits. Each ignition coil is connected to the PCM, power, or ground by the following circuits:
- The ground
- The ignition 1 voltage
- The appropriate IC control circuit
The PCM triggers an ignition coil by grounding the appropriate IC control circuit using information from the crankshaft position (CKP) and camshaft position (CMP) sensors.
Diagnostic Aids
- The crankshaft position (CKP) signal is not needed to start and run.
- Many situations may lead to an intermittent condition. Perform each inspection or test as directed.
Important: Remove any debris from the connector surfaces before servicing a component Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.
- Inspect the PCM and the engine grounds for clean and secure connections. Refer to Wiring Repairs in Wiring Systems.
- For intermittent conditions, refer to Intermittent Conditions.
Test Description
The number below refers to the step number on the diagnostic table.
5 A few sparks, then nothing is considered no spark.
Step 1 - 6:
Step 7 - 11:
Step 12 - 16:
