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Home >> Pontiac >> 2000 >> Firebird Base, 2D Convertible, Standard >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 1 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P1635: 5-Volt Reference No. 1 Circuit >> Circuit Description
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Circuit Description

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

PCM uses a common 5-volt reference No. 1 circuit as a sensor feed to A/C pressure, MAP, Engine Oil Pressure (EOP) and left tank fuel level sensors. PCM monitors voltage on 5-volt reference No. 1 circuit. If voltage is out of range, DTC will set.

DTC will set when PCM detects 5-volt reference No. 1 circuit is out of range and condition is met for greater than 2 seconds.

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