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LAN CAN COMMUNICATION CIRCUIT LAN-121 < DTC/CIRCUIT DIAGNOSIS > [CAN SYSTEM (TYPE 4)] C D E F G H I J K L B A O P N CAN COMMUNICATION CIRCUIT Diagnosis Procedure INFOID:0000000012200591 1. CONNECTOR INSPECTION 1. Turn the ignition switch OFF. 2. Disconnect the battery cable from the negative terminal. 3. Disconnect all the unit connectors on CAN communication system. 4. Check terminals and connectors for damage, bend and loose connection. YES >> GO TO 2. NO >> Repair the terminal and connector. 2. CHECK HARNESS CONTINUITY (SHORT CIRCUIT) Check the continuity between the data link connector terminals. Is the inspection result normal? YES >> GO TO 3. NO >> Check the harness and repair the root cause. 3. CHECK HARNESS CONTINUITY (SHORT CIRCUIT) Check the continuity between the data link connector and the ground. Is the inspection result normal? YES >> GO TO 4. NO >> Check the harness and repair the root cause. 4. CHECK ECM AND BCM TERMINATION CIRCUIT 1. Remove the ECM and the BCM. 2. Check the resistance between the ECM terminals. - For NISMO RS models - Except for NISMO RS models 3. Check the resistance between the BCM terminals. Data link connector Continuity Connector No. Terminal No. M4 6 14 Not existed Data link connector Ground Continuity Connector No. Terminal No. M4 6 Not existed 14 Not existed ECM Resistance ( Ω) Terminal No. 100 99 Approx. 108 – 132 ECM Resistance ( Ω) Terminal No. 124 123 Approx. 108 – 132 BCM Resistance ( Ω) Terminal No. 39 40 Approx. 108 – 132 |