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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 ACTIVE BUS OR COMMUNICATION DTCS 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) 2. VISUAL INSPECTION NOTE: This code can set due to tire circumference differences and from the front or rear wheels being on Check tire pressure of all the tires. Check tire wear on all the tires. Ask the customer what the road and driving conditions were like when the fault set. Were any problems found? Yes >> Repair as necessary. If the code set during a front OR rear wheel spin condition, no repair is necessary. Perform the POWERTRAIN VERIFICATION TEST. (Refer to 9 - ENGINE - STANDARD PROCEDURE) No >> Go To 3 9 - 540 ENGINE ELECTRICAL DIAGNOSTICS WK |