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U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE For a complete wiring diagram Refer to Section 8W • When Monitored: • Set Condition: Possible Causes INTERMITTENT DTC CAN BUS OPEN OR SHORTED CONDITION ANTI-LOCK BRAKE MODULE ENGINE CONTROL MODULE (ECM) Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE - Diagnostic Test 1. DTC IS ACTIVE Ignition on, engine not running. With the scan tool, Clear DTCs in the Engine Control Module (ECM). Monitor the scan tool for at least two minutes. Cycle the ignition key off and on several times, leaving the ignition on for at least 10 seconds at a time. Start the engine. Allow the engine to reach normal operating temperature. With the scan tool, select View DTCs. Is the status Active for this DTC? Yes >> Refer to 8 - ELECTRICAL/ELECTRONIC CONTROL MODULES - DIAGNOSIS AND TESTING for diag- nostic procedures and for further possible causes. No >> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING) PM ENGINE ELECTRICAL DIAGNOSTICS - DIESEL 9 - 1407 |