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Home >> Buick >> 2001 >> Century Custom >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls Self-Diagnostics - 3.1L & 3.4L >> Diagnostic Tests >> DTC P1351: Ignition Control Timing Control Circuit Open >> Circuit Description

Circuit Description

The Ignition Control (IC) module sends signals that PCM requires for fuel control and spark advance calculations. At start of engine crank, IC module controls spark advance (by-pass mode). When the second 3X reference pulse is recognized by the PCM, PCM applies 5 volts to by-pass circuit, commanding IC module to switch spark advance to PCM control (IC mode). If PCM detects an open in the IC circuit, DTC P1351 will set. Engine will start and may run in by-pass mode timing.

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