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Home >> GMC >> 1997 >> Forward Control 4.3 W, L35, Automatic >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 10 (Engine Controls - Tests W/Codes - 6.5L Diesel (P Series)) >> Diagnostic Trouble Codes >> DTC P1635 - Pcm 5-Volt Reference Low >> Circuit Description

Circuit Description

WARNING: This page is about a different variant/trim than selected.

PCM provides a 5-volt supply for use in powering up sensors. This test monitors voltage present at PCM 5-volt reference terminals of boost and crankshaft position sensors, and optical/fuel temperature sensor (cam/hi res).

DTC will set when the following conditions are present:

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