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EC-176 < DTC/CIRCUIT DIAGNOSIS > [QR25DE] U1044 ENG COMM CIRCUIT U1044 ENG COMM CIRCUIT DTC Description INFOID:0000000011277926 DTC DETECTION LOGIC POSSIBLE CAUSE • Harness or connectors (LIN communication circuit is open or shorted.) • Generator FAIL-SAFE Not applicable DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING If DTC Confirmation Procedure has been previously conducted. always perform the following procedure before conducting the next test. 1. Turn ignition switch OFF and wait at least 10 seconds. 2. Turn ignition switch ON. 3. Turn ignition switch OFF and wait at least 10 seconds. >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Turn ignition ON and wait at least 10 seconds. 2. Check DTC. YES >> Proceed to . NO >> INSPECTION END Diagnosis Procedure INFOID:0000000011277927 1. CHECK LIN COMMUNICATION CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector and generator harness connector. 3. Check the continuity between ECM harness connector and generator harness connector. 4. Also check harness for short to power and short to ground. YES >> GO TO 2. NO >> Repair or replace error-detected parts. 2. REPLACE GENERATOR 1. Replace generator. Refer to CHG-20, "Removal and Installation" . 2. Erase DTC. 3. Perform DTC confirmation procedure again. Refer to . DTC CONSULT screen terms (Trouble diagnosis content) DTC detecting condition U1044 ENG COMM CIRCUIT A signal voltage of LIN communication between ECM and generator is excessively + − Continuity ECM Generator Connector Terminal Connector Terminal F52 85 F31 2 Existed |