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U0100–LOST COMMUNICATION WITH ECM/PCM 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 ECM OR PCM POWER AND GROUND ECM OR PCM 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. 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 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING). 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 3. VERIFY THAT THE ECM OR PCM IS ACTIVE ON THE BUS With the scan tool, select ECU View. Verify that the ECM or PCM is active on the bus. Is the ECM or PCM active on the bus? Yes >> Go To 4 No >> (Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING) for No Response related diagnostic procedures. 5 - 208 BRAKES - ABS ELECTRICAL DIAGNOSTICS KJ |