DTC P0351-P0358: Ignition Coil Primary Circuits: Description

WARNING: This page is about a different car, the 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

The electronic ignition system uses an individual ignition coil for each cylinder. There are 2 separate ignition module assemblies located in the camshaft cover of each cylinder bank. Each ignition module assembly contains an ignition control module and 4 ignition coils. Each ignition coil connects directly to a spark plug using a boot. This arrangement eliminates the need for secondary ignition wires. The ignition module assemblies receive power from a fused ignition feed. Both ignition module assemblies connect to chassis ground. A Reference Low circuit and 4 Ignition Control (IC) circuits connect each ignition module assembly to the Powertrain Control Module (PCM). The PCM uses the individual IC circuits in order to control the coil sequencing and the spark timing for each ignition coil. The IC circuits transmit timing pulses from the PCM to the ignition control module in order to trigger the ignition coil and in order to fire the spark plug. The PCM monitors each IC circuit for improper voltage levels. If a short to ground occurs in the IC circuit, this DTC will set.