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• 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 NOTE: The following items must be performed before continuing. • Pinion Factor and Tire Size MUST be programmed in the ABS Module. • All Bus Communication DTCs MUST be diagnosed. • All related Vehicle Speed and Wheel Speed DTCs that may be active in the ABS Module MUST be diag- Ignition on, engine not running. With a scan tool, read DTCs. 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 following conditions. • Unequal tire circumference between the tires on the vehicle. • Front or Rear wheels moving while the opposite wheels are not. (i.e., wheels slipping on loose gravel, ice 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 of the above conditions 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 - 500 ENGINE ELECTRICAL DIAGNOSTICS LX |