DTC P0351-P0358: Ignition Control Circuit: Description
WARNING: This page does not describe the selected car, but rather 13 other vehicles, including the 2002 GMC Yukon XL, 2002 GMC Sierra, 2002 GMC Savana Special, 2002 GMC Savana Camper Special, and 2002 GMC Savana. However, it is still accessible from the selected car via links, so may be relevant.
The ignition system on this engine uses an individual ignition control module (ICM) for each cylinder. The Powertrain Control Module (PCM) controls the ignition system operation. The PCM controls each coil using one of 8 Ignition Control (IC) circuits. The PCM commands the IC circuit low when a spark event is requested. This causes the ICM to energize the ignition coil to create a spark at the spark plug. Each ICM has the following circuits:
- The ignition control circuit.
- The ignition 1 voltage circuit.
- A ground circuit.
- A reference low circuit.