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U1024 CAN COMM CIRCUIT EC-149 < COMPONENT DIAGNOSIS > [VQ37VHR] C D E F G H I J K L M A EC N P O U1024 CAN COMM CIRCUIT Description INFOID:0000000001910712 CAN (Controller Area Network) is a serial communication line for real time application. It is an on-vehicle mul- DTC Logic INFOID:0000000001736736 DTC DETECTION LOGIC NOTE: DTC CONFIRMATION PROCEDURE 1. PRECONDITIONING TESTING CONDITION: >> GO TO 2. 2. PERFORM DTC CONFIRMATION PROCEDURE 1. Turn ignition switch ON and wait at least 3 seconds. 2. Check DTC. Is DTC detected? YES >> Go to NO >> INSPECTION END Diagnosis Procedure INFOID:0000000001736743 1. CHECK VVEL CAN COMMUNICATION CIRCUIT 1. Turn ignition switch OFF. 2. Disconnect ECM harness connector. 3. Disconnect VVEL control module harness connector. 4. Check the continuity between ECM harness connector and VVEL control module harness connector. 5. Also check harness for short to ground and power. Is the inspection result normal? YES >> GO TO 2. NO >> Repair open circuit or short to ground or short to power in harness or connectors. 2. CHECK INTERMITTENT INCIDENT DTC No. Trouble diagnosis name DTC detecting condition Possible cause U1024 VVEL CAN communication • When VVEL control module cannot transmit/receive can communication • When detecting error during the ini- tial diagnosis of CAN controller of • Harness or connectors (CAN communication line is open or • ECM ECM VVEL control module Continuity Connector Terminal Connector Terminal F102 54 E15 24 Existed 55 11 |