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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 116 (Engine Controls - Self-Diagnostics - 2.2L) >> Diagnostic Tests >> DTC P0502: VSS Circuit - Low Input (M/T) >> Diagnostic Aids

Diagnostic Aids

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

To locate an intermittent, use scan tool to monitor VEHICLE SPEED or TRANSMISSION OSS with vehicle raised and drive wheels moving more than 3 MPH. Wiggling wires while watching for a change in VEHICLE SPEED or TRANSMISSION OSS may locate area where an open or short to ground in wiring could lie.

If no OSS signal is received, speedometer will be inoperative. Once DTC is set, speedometer will be inoperative for rest of ignition cycle even if a valid signal is later received.

If ECM does not receive an OSS signal, ECM will command maximum line pressure. Shift timing will be affected as well.

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