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U0101–LOST COMMUNICATION WITH TCM For a complete wiring diagram Refer to Section 8W. • When Monitored: • With the ignition on • Battery voltage between 10 and 16 volts • IOD fuse installed • Set Condition: Possible Causes DTCs RELATED TO BATTERY VOLTAGE, IGNITION, OR VIN MESSAGES CAN C BUS CIRCUITS OPEN OR SHORTED TCM POWER AND GROUND PCM DTCs PRESENT TCM ANTI-LOCK BRAKES MODULE Diagnostic Test 1. VERIFY DTC IS ACTIVE NOTE: Ensure the IOD fuse is installed and battery voltage is between 10 and 16 volts before proceeding. NOTE: If present, diagnose and repair DTC U0002–CAN C BUS OFF PERFORMANCE, DTC U0146–LOST 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 >> Perform the Stored Lost Communication test procedure. Refer to the table of contents in this section. (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING). Perform BODY VERIFICATION TEST – VER 1. (Refer to BODY VERIFICATION TEST – VER 1). 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 - 354 BRAKES - ABS ELECTRICAL DIAGNOSTICS LX |