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Home >> Buick >> 2002 >> Century Custom >> Repair and Diagnosis >> Engine Performance >> System >> Engine Control System Self-Diagnostics - 3.1L Engine >> Diagnostic Tests >> DTC P1635: 5-Volt Reference Low >> Circuit Description

Circuit Description

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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