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P0501-VEHICLE SPEED SENSOR 1 PERFORMANCE (CONTINUED) For the Engine circuit diagram (Refer to 9 - ENGINE - SCHEMATICS AND DIAGRAMS). For a complete wiring diagram Refer to Section 8W. Theory of Operation The vehicle speed sensor rationality is a continuous test that monitors the vehicle speed sensor for lack of activity. • When Monitored: • Set Condition: Possible Causes (B22) VEHICLE SPEED NO.1 SIGNAL CIRCUIT SHORTED TO VOLTAGE (B22) VEHICLE SPEED NO.1 SIGNAL CIRCUIT OPEN (B22) VEHICLE SPEED NO.1 SIGNAL CIRCUIT SHORTED TO GROUND TIRE CIRCUMFERENCE PCM Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. ACTIVE DTC Ignition on, engine not running. NOTE: Check for any Bus Communication DTCs. If no Bus or Communication DTCs are set, check for active Is the DTC active at this time? Yes >> Go To 2 No >> Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) 9 - 534 ENGINE - ELECTRICAL DIAGNOSTICS - 3.7L/4.7L/5.7L DR/DH |