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Home >> Chevrolet >> 2002 >> Blazer 4D Utility, 4WD, Part Time >> Repair and Diagnosis >> External Pages >> Different car >> Section 101 (Engine Control System Self-Diagnostics - 3.4L) >> Diagnostic Tests >> DTC P1635: 5-Volt Reference Low >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 Pontiac Grand Am, 2002 Oldsmobile Alero, 2002 Chevrolet Monte Carlo, and 2002 Chevrolet Impala. However, it is still accessible from the selected car via links, so may be relevant.

The PCM uses the 5-volt reference 1 circuit as a sensor feed to the TP sensor, MAP sensor, EGR valve pintle position sensor and the FTP sensor.

The PCM monitors the voltage on the 5-volt reference 1 circuit. If voltage is out of tolerance, PCM will set DTC P1635.

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