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 6 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.
- Inspect the PCM and the engine grounds for clean and secure connections.

IMPORTANT: Remove any debris from the connector surfaces before servicing a component. Ensure that the gaskets are installed correctly. The gaskets prevent contaminate intrusion.

- For intermittent conditions, refer to Diagnostic Aids for Circuit Testing and Wiring Repair procedures.

TEST DESCRIPTION

Steps 1 - 9:

Steps 10 - 21:

Step 22:

The number below refers to the step number on the diagnostic table.
5. A few sparks, then nothing is considered no spark.