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Home >> Cadillac >> 2000 >> Seville SLS >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Control System - Self-Diagnostics - 4.6L >> Diagnostic Tests >> DTC P1634: Ignition 1 Switch Circuit >> Circuit Description

Circuit Description

PCM receives 3 ignition inputs from ignition switch: IGN 0, IGN 1, and CRANK request. PCM receives IGN 1 input with ignition switch in RUN and START positions. PCM uses a Class II ignition mode message and voltage input from 2 separate systems to test the IGN 1 circuit. If PCM detects an improper IGN 1 input, DTC will set.

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