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Home >> Chevrolet >> 2001 >> Camaro Base, 2D Convertible, Automatic >> Repair and Diagnosis >> External Pages >> Different car >> Section 7 (Engine Control System Self-Diagnostics - 5.7L) >> Diagnostic Tests >> DTC P1639: 5-Volt Reference No. 2 Circuit ("F" Body) >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2000 Pontiac Firebird, 2000 Chevrolet Corvette, and 2000 Chevrolet Camaro. However, it is still accessible from the selected car via links, so may be relevant.

PCM uses a common 5-volt reference circuit as a sensor feed to fuel tank pressure sensor, fuel tank level sensor, and TP sensor. PCM monitors voltage on 5-volt reference circuit. If 5-volt reference circuit is out of range for greater than 2 seconds, DTC will set.

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