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Home >> Chevrolet >> 2000 >> Chevy Express G2500, Van Passenger Extended, 6.5 F >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - Diesel >> Diagnostic Tests >> DTC P1635: Pcm 5-Volt Reference Low >> Circuit Description
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Circuit Description

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 ignition is on and 5-volt reference is less than one volt.

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