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Home >> Cadillac >> 1998 >> DeVille Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System - Tests W/Codes >> Diagnostic Trouble Codes >> DTC P1320 - Ignition Control (Ic) Module 4X Reference Circuit Intermittent No Pulse >> Circuit Description
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Circuit Description

IC module creates a 4X signal and a 24X signal that is used by the PCM for ignition and fuel control. If PCM does not receive 4X reference pulses from the IC module for greater than .4 second while engine is running, DTC will set.

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