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CAN Communication Circuit Check

WARNING: This page is about a different car, the 2002 Infiniti Q45. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK CONNECTOR 
    1. Turn ignition switch OFF.
    2. Check following terminals and connector for damage, bend and loose connection. (control module-side, control unit-side, meter-side, sensor-side and harness-side)
    • TCM.
    • Combination meter.
    • Steering wheel angle sensor.
    • VDC/TCS/ABS control unit.
    • ECM.
    • Between TCM and ECM.

    OK or NG

    1. OK >> GO TO 2.
    2. NG >> Repair terminal or connector.
  2. CHECK HARNESS FOR SHORT CIRCUIT 
    1. Disconnect TCM connector and harness connector F105.
    2. Check continuity between TCM harness connector F103 terminals 6 (LG/B) and 7(P/B).

      6(LG/B)-7(P/B) : Continuity should not exist. 

      Fig 1: Checking Continuity Between TCM Harness Connector F103 Terminals 6 (LG/B) And 7(P/B)
      G02031072Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK >> GO TO 3.
    2. NG >> Repair harness between TCM and harness connector F105.
  3. CHECK HARNESS FOR SHORT CIRCUIT 

    Check continuity between TCM harness connector F103 terminals 6(LG/B), 7(P/B) and ground.

    6(LG/B) - ground : Continuity should not exist. 

    7(P/B) - ground : Continuity should not exist. 

    Fig 2: Checking Continuity Between TCM Harness Connector F103 Terminals 6(LG/B), 7(P/B) And Ground
    G02031073Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK >> GO TO 4.
    2. NG >> Repair harness between TCM and harness connector F105.
  4. CHECK HARNESS FOR SHORT CIRCUIT 
    1. Disconnect combination meter connector, steering wheel angle sensor connector and harness connector M6.
    2. Check continuity between Data Link Connector M31 terminals 6(LG/B) and 3(P/B).

      6(LG/B) - 3(P/B) : Continuity should not exist. 

      Fig 3: Checking Continuity Between Data Link Connector M31 Terminals 6(LG/B) And 3(P/B)
      G02031074Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK >> GO TO 5.
    2. NG >>
      • Repair harness between harness connector M6 and harness connector M135.
      • Repair harness between splice points M13, M14 and Data Link Connector.
      • Repair harness between splice points M13, M14 and combination meter.
      • Repair harness between splice points M13, M14 and steering wheel angle sensor.
  5. CHECK HARNESS FOR SHORT CIRCUIT 

    Check continuity between Data Link Connector M31 terminals 6 (LG/B), 3(P/B) and ground.

    6(LG/B) - ground : Continuity should not exist. 

    3(P/B) - ground : Continuity should not exist. 

    Fig 4: Checking Continuity Between Data Link Connector M31 Terminals 6 (LG/B), 3(P/B) And Ground
    G02031075Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK >> GO TO 6.
    2. NG >>
      • Repair harness between harness connector M6 and harness connector M135.
      • Repair harness between splice points M13, M14 and Data Link Connector.
      • Repair harness between splice points M13, M14 and combination meter.
      • Repair harness between splice points M13, M14 and steering wheel angle sensor.
  6. CHECK HARNESS FOR SHORT CIRCUIT 
    1. Disconnect harness connector B63.
    2. Check continuity between harness connector B6 terminals 23(LG/B) and 24(P/B).

      23(LG/B) - 24(P/B) : Continuity should not exist. 

      Fig 5: Checking Continuity Between Harness Connector B6 Terminals 23(LG/B) And 24(P/B)
      G02031076Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK >> GO TO 7.
    2. NG >> Repair harness between harness connector B6 and harness connector B63.
  7. CHECK HARNESS FOR SHORT CIRCUIT 

    Check continuity between harness connector B6 terminals 23(LG/B), 24(P/B) and ground.

    23(LG/B) - ground : Continuity should not exist. 

    24(P/B) - ground : Continuity should not exist. 

    Fig 6: Checking Continuity Between Harness Connector B6 Terminals 23(LG/B), 24(P/B) And Ground
    G02031077Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK >> GO TO 8.
    2. NG >> Repair harness between harness connector B6 and harness connector B63.
  8. CHECK HARNESS FOR SHORT CIRCUIT 
    1. Disconnect harness connector B204.
    2. Check continuity between harness connector B263 terminals 9(LG/B) and 8(P/B).

      9(LG/B) - 8(P/B) : Continuity should not exist. 

      Fig 7: Checking Continuity Between Harness Connector B263 Terminals 9(LG/B) And 8(P/B)
      G02031078Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK >> GO TO 9.
    2. NG >> Repair harness between harness connector B263 and harness connector B204.
  9. CHECK HARNESS FOR SHORT CIRCUIT 

    Check continuity between harness connector B263 terminals 9(LG/B), 8(P/B) and ground.

    9(LG/B) - ground : Continuity should not exist. 

    8(P/B) - ground : Continuity should not exist. 

    Fig 8: Checking Continuity Between Harness Connector B263 Terminals 9(LG/B), 8(P/B) And Ground
    G02031079Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK >> GO TO 10.
    2. NG >> Repair harness between harness connector B263 and harness connector B204.
  10. CHECK HARNESS FOR SHORT CIRCUIT 
    1. Disconnect VDC/TCS/ABS control unit connector and harness connector E34.
    2. Check continuity between VDC/TCS/ABS control unit harness connector E218 terminals 61 (LG/B) and 63(P/B).

      61(LG/B)-63(P/B) : Continuity should not exist. 

      Fig 9: Checking Continuity Between VDC/TCS/ABS Control Unit Harness Connector E218 Terminals 61 (LG/B) And 63(P/B)[]
      G02031080Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK >> GO TO 11.
    2. NG >>
      • Repair harness between harness connector E34 and harness connector E224.
      • Repair harness between splice points E54, E55 and VDC/TCS/ABS control unit.
  11. CHECK HARNESS FOR SHORT CIRCUIT 

    Check continuity between VDC/TCS/ABS control unit harness connector E218 terminals 61 (LG/B), 63(P/B) and ground.

    61(LG/B) - ground : Continuity should not exist. 

    63(P/B) - ground : Continuity should not exist. 

    Fig 10: Checking Continuity Between VDC/TCS/ABS Control Unit Harness Connector E218 Terminals 61 (LG/B), 63(P/B) And Ground
    G02031081Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK >> GO TO 12.
    2. NG >>
      • Repair harness between harness connector E34 and harness connector E224.
      • Repair harness between splice points E54, E55 and VDC/TCS/ABS control unit.
  12. CHECK HARNESS FOR SHORT CIRCUIT 
    1. Disconnect ECM connector.
    2. Check continuity between ECM harness connector F102 terminals 174 (LG/B) and 171(P/B).

      174(LG/B) - 171(P/B) : Continuity should not exist. 

      Fig 11: Checking Continuity Between ECM Harness Connector F102 Terminals 174 (LG/B) And 171(P/B)
      G02031082Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK >> GO TO 13.
    2. NG >> Repair harness between ECM and harness connector F34.
  13. CHECK HARNESS FOR SHORT CIRCUIT 

    Check continuity between ECM harness connector F102 terminals 174 (LG/B), 171 (P/B) and ground.

    174(LG/B) - ground : Continuity should not exist. 

    171(P/B) - ground : Continuity should not exist. 

    Fig 12: Checking Continuity Between ECM Harness Connector F102 Terminals 174 (LG/B), 171 (P/B) And Ground
    G02031083Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    1. OK >> GO TO 14.
    2. NG >> Repair harness between ECM and harness connector F34.
  14. ECM/TCM INTERNAL CIRCUIT INSPECTION 

    Check components inspection. Refer to "ECM/TCM INTERNAL CIRCUIT INSPECTION  "

    OK or NG

    1. OK >> Reconnect all connectors to perform "SELF-DIAG RESULTS" and "DATA MONITOR" for "ENGINE", "A/T", and "VDC". Refer to DTC U1000 CAN COMMUNICATION LINE for "ENGINE" and Refer to "DTC U1000 CAN COMMUNICATION LINE " for "A/T". Refer to INSPECTION 1 CAN COMMUNICATION LINE OR VDC/TCS/ABS CONTROL UNIT AND STEERING ANGLE SENSOR SYSTEM for "VDC".
    2. NG >> Replace ECM and/or TCM.
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