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Home >> Buick >> 2006 >> Rainier 4.2 S, AWD >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - 4.2L - DTC P0135 To P0418 >> DTC P0351-P0356 >> Circuit/System Description

Circuit/System Description

The ignition system uses individual ignition coil assemblies for each cylinder. The Powertrain Control Module (PCM) controls the individual coils by transmitting timing pulses on the Ignition Control (IC) circuit of each ignition coil to enable a spark event. The PCM monitors each IC circuit for improper voltage levels. Each ignition coil has the following circuits:

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