Circuit Description

WARNING: This page is about a different car, the 2007 Hummer H2. 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 coil for each cylinder. The powertrain control module (PCM) controls the spark event for each cylinder through 8 individual ignition control (IC) circuits. When the PCM commands the IC circuit ON, electrical current will flow through the primary winding of the ignition coil, creating a magnetic field. When a spark event is requested, the PCM will command the IC circuit OFF, interrupting current flow through the primary winding. The magnetic field created by the primary winding will collapse across the secondary coil winding, producing a high voltage across the spark plug electrodes. The PCM uses information from the crankshaft position (CKP) and the camshaft position (CMP) sensor for sequencing and timing of the spark events. Each ignition coil/module has the following circuits:

An ignition 1 voltage circuit
A ground circuit
An ignition control (IC) circuit
A low reference circuit

If the PCM detects that the IC circuit has an incorrect voltage level, DTC P0351-P0358 will set.