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Home >> GMC >> 2003 >> Safari Van Cargo, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 114 (Engine Controls - Self-Diagnostics) >> Diagnostic Tests >> DTC P0502: VSS Circuit - Low Input (M/T Without Abs) >> Diagnostic Aids

Diagnostic Aids

WARNING: This page is about a different car, the 2002 Saturn LW200, 2002 Saturn L200, and 2002 Saturn L100. However, it is still accessible from the selected car via links, so may be relevant.

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

If vehicle speed signal is missing, speedometer will be inoperative.

Right front wheel speed sensor resistance should be 1000-2000 ohms.

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