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Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 70 (Engine Controls - Self-Diagnostics - 3.5L) >> Diagnostic Tests >> DTC P1639: 5-Volt Reference "B" Circuit >> Circuit Description

Circuit Description

WARNING: This page is about a different car, the 2002 Oldsmobile Intrigue and 2002 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.

Powertrain Control Module (PCM) uses the 5-volt reference "B" circuit as a sensor feed to the A/C pressure sensor and Fuel Tank Pressure (FTP) sensor. The PCM monitors voltage on the 5-volt reference "B" circuit. If the voltage is out of tolerance, DTC P1639 will set.

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