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U1003





CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: U1003: Lost Communication with Can Gateway Module
U1003 - Lost Communication with Can Gateway Module

DESCRIPTION





HINT
*: w/ Active stabilizer suspension system

WIRING DIAGRAM









INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN BUS LINE (MAIN WIRE FOR DISCONNECTION, BUS LINES FOR SHORT CIRCUIT)

(a) Measure the resistance of the wire harness side connector.





Standard resistance:





Result





C -- CHECK CAN BUS LINES FOR DISCONNECTION

B -- CHECK CAN BUS LINES FOR SHORT (CAN JUNCTION CONNECTOR LH SIDE)
A -- Continue to next step.

2. CHECK CAN MAIN WIRE FOR DISCONNECTION (CAN JUNCTION CONNECTOR RR - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the V38 CAN junction connector RR connector.





(b) Measure the resistance of the wire harness side connector.

Standard resistance:





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

3. CONNECT CONNECTOR

(a) Reconnect the V38 CAN junction connector RR connector.

NEXT -- Continue to next step.

4. CHECK CAN MAIN WIRE FOR DISCONNECTION (CAN JUNCTION CONNECTOR RR - CAN JUNCTION CONNECTOR RH)

(a) Disconnect the V37 CAN junction connector RR connector.





(b) Measure the resistance of the wire harness side connector.

Standard resistance:





OK -- CONNECT CONNECTOR

NG -- REPLACE CAN JUNCTION CONNECTOR RR

5. CONNECT CONNECTOR

(a) Reconnect the V38 CAN junction connector RR connector.

NEXT -- Continue to next step.

6. CHECK CAN MAIN WIRE FOR DISCONNECTION (CAN JUNCTION CONNECTOR LH - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the K3 CAN junction connector LH connector.





(b) Measure the resistance of the wire harness side connector.

Standard resistance:





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

7. CHECK CAN MAIN WIRE FOR DISCONNECTION (CAN JUNCTION CONNECTOR - CAN JUNCTION CONNECTOR RR)

(a) Disconnect the K7 CAN junction connector LH connector.





(b) Measure the resistance of the wire harness side connector.

Standard resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN JUNCTION CONNECTOR LH - CAN JUNCTION CONNECTOR RR)

OK -- REPLACE CAN JUNCTION CONNECTOR LH

8. CONNECT CONNECTOR

(a) Reconnect the K3 CAN junction connector LH connector.

NEXT -- Continue to next step.

9. CHECK CAN MAIN WIRE FOR DISCONNECTION (HYBRID VEHICLE CONTROL ECU - CAN JUNCTION CONNECTOR LH)

(a) Disconnect the A54 hybrid vehicle control ECU connector.





(b) Measure the resistance of the wire harness side connector.

Standard resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (HYBRID VEHICLE CONTROL ECU - CAN JUNCTION CONNECTOR LH)

OK -- REPLACE HYBRID VEHICLE CONTROL ECU

10. CONNECT CONNECTOR

(a) Reconnect the V37 CAN junction connector RR connector.

NEXT -- Continue to next step.

11. CHECK CAN MAIN WIRE FOR DISCONNECTION (CAN JUNCTION CONNECTOR RH - CAN JUNCTION CONNECTOR RR)

(a) Disconnect the K81 CAN junction connector RH connector.





(b) Measure the resistance of the wire harness side connector.

Standard resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN JUNCTION CONNECTOR RH - CAN JUNCTION CONNECTOR RR)

OK -- REPLACE CAN JUNCTION CONNECTOR RH

12. CHECK CAN BUS LINES FOR SHORT (CAN JUNCTION CONNECTOR LH SIDE)

(a) Disconnect the V38 CAN junction connector RR connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





OK -- CONNECT CONNECTOR
NG -- Continue to next step.

13. CHECK CAN BUS LINES FOR SHORT (CAN JUNCTION CONNECTOR LH - CAN JUNCTION CONNECTOR RR)

(a) Disconnect the K7 CAN junction connector LH connector.

(b) Measure the resistance of the wire harness side connectors.





Standard resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN JUNCTION CONNECTOR LH - CAN JUNCTION CONNECTOR RR)
OK -- Continue to next step.

14. CONNECT CONNECTOR

(a) Reconnect the V38 CAN junction connector RR connector.

(b) Reconnect the K7 CAN junction connector LH connector.

NEXT -- Continue to next step.

15. CHECK CAN BUS LINES FOR SHORT (CAN JUNCTION CONNECTOR LH - ECM)

(a) Disconnect the K4 CAN junction connector LH connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

16. CHECK CAN BUS LINES FOR SHORT (CAN JUNCTION CONNECTOR LH - SKID CONTROL ECU)

(a) Disconnect the K2 CAN junction connector LH connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

17. CHECK CAN BUS LINES FOR SHORT (CAN JUNCTION CONNECTOR LH - YAW RATE SENSOR)

(a) Disconnect the K6 CAN junction connector LH connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

18. CHECK CAN BUS LINES FOR SHORT (CAN JUNCTION CONNECTOR LH - STEERING ANGLE SENSOR)

(a) Disconnect the K8 CAN junction connector LH connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

19. CHECK CAN BUS LINES FOR SHORT (CAN JUNCTION CONNECTOR - HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the K3 CAN junction connector LH connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- CONNECT CONNECTOR

OK -- REPAIR OR REPLACE CAN JUNCTION CONNECTOR LH

20. CONNECT CONNECTOR

(a) Reconnect the K4 CAN junction connector LH connector.

NEXT -- Continue to next step.

21. CHECK CAN BUS LINES FOR SHORT (ECM)

(a) Disconnect the A53 ECM connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO ECM (CAN+, CAN-)

OK -- REPLACE ECM

22. CONNECT CONNECTOR

(a) Reconnect the K2 CAN junction connector LH connector.

NEXT -- Continue to next step.

23. CHECK CAN BUS LINES FOR SHORT (SKID CONTROL ECU)

(a) Disconnect the A15 skid control ECU connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO SKID CONTROL ECU (CANH, CANL)

OK -- REPLACE SKID CONTROL ECU

24. CONNECT CONNECTOR

(a) Reconnect the K6 CAN junction connector LH connector.

NEXT -- Continue to next step.

25. CHECK CAN BUS LINES FOR SHORT (YAW RATE SENSOR)

(a) Disconnect the K35 yaw rate sensor connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO YAW RATE SENSOR (CANH, CANL)

OK -- REPLACE YAW RATE SENSOR

26. CONNECT CONNECTOR

(a) Reconnect the K8 CAN junction connector LH connector.

NEXT -- Continue to next step.

27. CHECK CAN BUS LINES FOR SHORT (STEERING ANGLE SENSOR)

(a) Disconnect the K19 steering angle sensor connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO STEERING ANGLE SENSOR

OK -- REPLACE STEERING ANGLE SENSOR

28. CONNECT CONNECTOR

(a) Reconnect the K3 CAN junction connector LH connector.

NEXT -- Continue to next step.

29. CHECK CAN BUS LINES FOR SHORT (HYBRID VEHICLE CONTROL ECU)

(a) Disconnect the A54 hybrid vehicle control ECU connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO HYBRID VEHICLE CONTROL ECU (CAN JUNCTION CONNECTOR LH - HYBRID VEHICLE CONTROL ECU)

OK -- REPLACE HYBRID VEHICLE CONTROL ECU

30. CONNECT CONNECTOR

(a) Reconnect the V38 CAN junction connector RR connector.

NEXT -- Continue to next step.

31. CHECK CAN BUS LINES FOR SHORT (CAN JUNCTION CONNECTOR RH SIDE)

(a) Disconnect the V37 CAN junction connector RR connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





Result





C -- REPAIR OR REPLACE CAN JUNCTION CONNECTOR RR

B -- CONNECT CONNECTOR
A -- Continue to next step.

32. CHECK CAN BUS LINES FOR SHORT (CAN JUNCTION CONNECTOR RR - CAN JUNCTION CONNECTOR RH)

(a) Disconnect the K81 CAN junction connector RH connector.

(b) Measure the resistance of the wire harness side connectors.





Standard resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN JUNCTION CONNECTOR RR - CAN JUNCTION CONNECTOR RH)
OK -- Continue to next step.

33. CONNECT CONNECTOR

(a) Reconnect the V37 CAN junction connector RR connector.

(b) Reconnect the K81 CAN junction connector RH connector.

NEXT -- Continue to next step.

34. CHECK CAN BUS LINES FOR SHORT (CAN JUNCTION CONNECTOR RH - FRONT ACTIVE STABILIZER CONTROL ECU)

NOTICE:
For vehicles without the active stabilizer suspension system, go to "CHECK CAN BUS LINES FOR SHORT (CAN JUNCTION CONNECTOR RH - STEERING CONTROL ECU)".

(a) Disconnect the K79 CAN junction connector RH connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

35. CHECK CAN BUS LINES FOR SHORT (CAN JUNCTION CONNECTOR RH - STEERING CONTROL ECU)

(a) Disconnect the K75 CAN junction connector RH connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

36. CHECK CAN BUS LINES FOR SHORT (CAN JUNCTION CONNECTOR RH - POWER STEERING ECU)

(a) Disconnect the K80 CAN junction connector RH connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- CONNECT CONNECTOR
OK -- Continue to next step.

37. CHECK CAN BUS LINES FOR SHORT (CAN JUNCTION CONNECTOR RH - ABSORBER CONTROL ECU)

(a) Disconnect the K76 CAN junction connector RH connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- CONNECT CONNECTOR

OK -- REPAIR OR REPLACE CAN JUNCTION CONNECTOR RH

38. CONNECT CONNECTOR

(a) Reconnect the K79 CAN junction connector RH connector.

NEXT -- Continue to next step.

39. CHECK CAN BUS LINES FOR SHORT (FRONT ACTIVE STABILIZER CONTROL ECU)

(a) Disconnect the A58 front active stabilizer control ECU connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO FRONT ACTIVE STABILIZER CONTROL ECU (CANH, CANL)

OK -- REPLACE FRONT ACTIVE STABILIZER CONTROL ECU

40. CONNECT CONNECTOR

(a) Reconnect the K75 CAN junction connector RH connector.

NEXT -- Continue to next step.

41. CHECK CAN BUS LINES FOR SHORT (STEERING CONTROL ECU)

(a) Disconnect the K70 steering control ECU connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO STEERING CONTROL ECU (CANH, CANL)

OK -- REPLACE STEERING CONTROL ECU

42. CONNECT CONNECTOR

(a) Reconnect the K80 CAN junction connector RH connector.

NEXT -- Continue to next step.

43. CHECK CAN BUS LINES FOR SHORT (POWER STEERING ECU)

(a) Disconnect the A23 power steering ECU connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO POWER STEERING ECU (CANH, CANL)

OK -- REPLACE POWER STEERING ECU

44. CONNECT CONNECTOR

(a) Reconnect the K76 CAN junction connector RH connector.

NEXT -- Continue to next step.

45. CHECK CAN BUS LINES FOR SHORT (ABSORBER CONTROL ECU)

(a) Disconnect the K72 absorber control ECU connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO ABSORBER CONTROL ECU (CANH, CANL)

OK -- REPLACE ABSORBER CONTROL ECU

46. CONNECT CONNECTOR

(a) Reconnect the V37 CAN junction connector RR connector.

NEXT -- Continue to next step.

47. CHECK CAN BUS LINES FOR SHORT (CAN JUNCTION CONNECTOR RR - REAR ACTIVE STABILIZER CONTROL ECU)

(a) Disconnect the V38 CAN junction connector RR connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





OK -- REPAIR OR REPLACE CAN JUNCTION CONNECTOR RR
NG -- Continue to next step.

48. CONNECT CONNECTOR

(a) Reconnect the V38 CAN junction connector RR connector.

NEXT -- Continue to next step.

49. CHECK CAN BUS LINES FOR SHORT (REAR ACTIVE STABILIZER CONTROL ECU)

(a) Disconnect the y1 rear active stabilizer control ECU connector.





(b) Measure the resistance of the wire harness side connectors.

Standard resistance:





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO REAR ACTIVE STABILIZER CONTROL ECU (CANH, CANL)

OK -- REPLACE REAR ACTIVE STABILIZER CONTROL ECU

50. CHECK CAN BUS LINES FOR DISCONNECTION

(a) Check the connections of each connector.

(b) Clear the DTC.

(c) Recheck for DTCs.

Result:





B -- RECOVERY TO NORMAL

A -- REPLACE HYBRID VEHICLE CONTROL ECU
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