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U1501–IMPLAUSIBLE MESSAGE DATA LENGTH RECEIVED FROM ECM/PCM For a complete wiring diagram Refer to Section 8W • When Monitored: • Set Condition: Possible Causes WIRING HARNESS, TERMINAL, CONNECTOR DAMAGE DTCs RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES CAN C BUS CIRCUITS OPEN OR SHORTED ECM OR PCM DTCs PRESENT ECM OR PCM ANTI-LOCK BRAKES MODULE Diagnostic Test 1. VERIFY DTC IS ACTIVE Turn the ignition on. With the scan tool, read and record ABS DTCs. With the scan tool, read and record Environmental Data (EV Data). With the scan tool, erase ABS DTCs. Cycle the ignition switch. With the scan tool, read ABS DTCs. Does this DTC reset? Yes >> Go To 2 No >> Using the schematics as a guide, check the Anti-Lock Brakes Module and the ECM or PCM pins, ter- minals, and connectors for corrosion, damage, and terminal push out. Pay particular attention to all Perform ABS VERIFICATION TEST - VER 1. (Refer to 5 - BRAKES - STANDARD PROCEDURE). 2. CHECK FOR ANY OF THE FOLLOWING ACTIVE DTCs With the scan tool, read all active DTCs from all CAN C Bus modules. NOTE: Check for CAN C hardware electrical, VIN Missing/Mismatch, battery or ignition related DTCs. Does the scan tool display any active DTCs related to the conditions listed above? Yes >> Diagnose and repair the DTC(s). Refer to the Table of Contents in the applicable Section. No >> Go To 3 5 - 236 BRAKES - ABS ELECTRICAL DIAGNOSTICS KJ |