Part 1

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: Short to GND in CAN Bus Line
- Short to GND in CAN Bus Line

DESCRIPTION

There may be a short circuit between the CAN bus line and GND when there is resistance between terminals 6 (CANH) and 4 (CG) or terminals 14 (CANL) and 4 (CG) of the DLC3.

WIRING DIAGRAM

INSPECTION PROCEDURE

PROCEDURE

1. CHECK CAN BUS LINE FOR SHORT TO GND (DLC3 SUB BUS LINE)

(a) Disconnect the DLC3 sub bus line connector (K2) from the D-CAN J/C A side (w/ earth terminal).

NOTICE:
* Before disconnecting the connector, make a note of where it is connected.
* Reconnect the connector to its original position.

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:

NG -- REPAIR OR REPLACE DLC3 SUB BUS LINE OR CONNECTOR
OK -- Continue to next step.

2. CONNECT CONNECTOR

(a) Reconnect the DLC3 sub bus line connector (K2) to the D-CAN J/C A side (w/ earth terminal).

NEXT -- Continue to next step.

3. CHECK CAN BUS LINE FOR SHORT TO GND (CAN BUSES TO D-CAN J/C)

(a) Disconnect the CAN main bus line connector (K4) from the D-CAN J/C A side (w/ earth terminal).

Standard resistance:

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

4. CONNECT CONNECTOR

(a) Reconnect the CAN main bus line connector (K4) to the D-CAN J/C A side (w/ earth terminal).

NEXT -- Continue to next step.

5. CHECK CAN BUS LINES FOR SHORT TO GND (DISTANCE CONTROL ECU SUB BUS LINE)

NOTICE:
Only for vehicles with the dynamic radar cruise control system. For other vehicles, go to the next step.

(a) Disconnect the distance control ECU sub bus line connector (K87) from the D-CAN J/C B side (w/o earth terminal).

Standard resistance:

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

6. CONNECT CONNECTOR

(a) Reconnect the distance control ECU sub bus line connector (K87) to the D-CAN J/C B side (w/o earth terminal).

NEXT -- Continue to next step.

7. CHECK CAN BUS LINES FOR SHORT TO GND (SEAT BELT CONTROL ECU SUB BUS LINE)

NOTICE:
Only for vehicles with the dynamic radar cruise control system. For other vehicles, go to the next step.

(a) Disconnect the seat belt control ECU sub bus line connector (K8) from the D-CAN J/C B side (w/o earth terminal).

Standard resistance:

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

8. CONNECT CONNECTOR

(a) Reconnect the seat belt control ECU sub bus line connector (K8) to the D-CAN J/C B side (w/o earth terminal).

NEXT -- Continue to next step.

9. CHECK CAN BUS LINES FOR SHORT TO GND (STEERING ANGLE SENSOR SUB BUS LINE)

(a) Disconnect the steering angle sensor sub bus line connector (K6) from the D-CAN J/C B side (w/o earth terminal).

Standard resistance:

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

10. CONNECT CONNECTOR

(a) Reconnect the steering angle sensor sub bus line connector (K6) to the D-CAN J/C B side (w/o earth terminal).

NEXT -- Continue to next step.

11. CHECK CAN BUS LINES FOR SHORT TO GND (SKID CONTROL ECU SUB BUS LINE)

NOTICE:
Only for vehicles with the 1UR-FSE. For other vehicles, go to the next step.

(a) Disconnect the skid control ECU sub bus line connector (K5) from the D-CAN J/C A side (w/ earth terminal).

Standard resistance:

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

12. CONNECT CONNECTOR

(a) Reconnect the skid control ECU sub bus line connector (K5) to the D-CAN J/C A side (w/ earth terminal).

NEXT -- Continue to next step.

13. CHECK CAN BUS LINES FOR SHORT TO GND (ECM SUB BUS LINE)

(a) Disconnect the ECM sub bus line connector (K3) from the D-CAN J/C A side (w/ earth terminal).

Standard resistance:

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

14. CONNECT CONNECTOR

(a) Reconnect the ECM sub bus line connector (K3) to the D-CAN J/C A side (w/ earth terminal).

NEXT -- Continue to next step.

15. CHECK CAN BUS LINES FOR SHORT TO GND (NAVIGATION ECU SUB BUS LINE)

NOTICE:
* Only for vehicles with the 2GR-FSE and navigation system. For other vehicles, go to the next step.
* Before disconnecting the connector, make a note of where it is connected.
* Reconnect the connector to its original position.

(a) Disconnect the navigation ECU sub bus line connector (K95) from the D-CAN J/C B side (w/o earth terminal).

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:

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

16. CONNECT CONNECTOR

(a) Reconnect the navigation ECU sub bus line connector (K95) to the D-CAN J/C B side (w/o earth terminal).

NEXT -- Continue to next step.

17. CHECK CAN BUS LINES FOR SHORT TO GND (YAW RATE SENSOR SUB BUS LINE)

(a) Disconnect the yaw rate sensor connector (K35).

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:

Result

C -- CHECK CAN BUS LINES FOR SHORT TO GND (CAN BUSES TO D-CAN J/C)

B -- REPLACE YAW RATE SENSOR

A -- REPAIR OR REPLACE YAW RATE SENSOR SUB BUS LINE CONNECTOR (CAN-H, CAN-L)

18. CONNECT CONNECTOR

(a) Reconnect the distance control ECU sub bus line connector (K87) to the D-CAN J/C B side (w/o earth terminal).

NEXT -- Continue to next step.

19. CHECK CAN BUS LINES FOR SHORT TO GND (DISTANCE CONTROL ECU SUB BUS LINE)

(a) Disconnect the distance control ECU connector (K13).

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:

OK -- REPLACE DISTANCE CONTROL ECU

NG -- REPAIR OR REPLACE DISTANCE CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)

20. CONNECT CONNECTOR

(a) Reconnect the seat belt control ECU sub bus line connector (K8) to the D-CAN J/C B side (w/o earth terminal).

NEXT -- Continue to next step.

21. CHECK CAN BUS LINES FOR SHORT TO GND (SEAT BELT CONTROL ECU SUB BUS LINE)

(a) Disconnect the seat belt control ECU connector (V43).

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:

OK -- REPLACE SEAT BELT CONTROL ECU

NG -- REPAIR OR REPLACE SEAT BELT CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)

22. CONNECT CONNECTOR

(a) Reconnect the steering angle sensor sub bus line connector (K6) to the D-CAN J/C B side (w/o earth terminal).

NEXT -- Continue to next step.

23. CHECK CAN BUS LINES FOR SHORT TO GND (STEERING ANGLE SENSOR SUB BUS LINE)

(a) Disconnect the steering angle sensor connector (K19).

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:

OK -- REPLACE STEERING ANGLE SENSOR

NG -- REPAIR OR REPLACE STEERING ANGLE SENSOR SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)

24. CONNECT CONNECTOR

(a) Reconnect the skid control ECU sub bus line connector (K5) to the D-CAN J/C A side (w/ earth terminal).

NEXT -- Continue to next step.

25. CHECK CAN BUS LINES FOR SHORT TO GND (SKID CONTROL ECU SUB BUS LINE)

(a) Disconnect the skid control ECU connector (A15).

(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:

OK -- REPLACE SKID CONTROL ECU

NG -- REPAIR OR REPLACE SKID CONTROL ECU SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)

26. CONNECT CONNECTOR

(a) Reconnect the ECM sub bus line connector (K3) to the D-CAN J/C A side (w/ earth terminal).

NEXT -- Continue to next step.

27. CHECK CAN BUS LINES FOR SHORT TO GND (ECM SUB BUS LINE)

(a) 2GR-FSE: Disconnect the ECM connector (A6).

(b) 1UR-FSE: Disconnect the ECM connector (A7).

(c) Measure the resistance according to the value(s) in the table below.

Standard resistance:

OK -- REPLACE ECM

NG -- REPAIR OR REPLACE ECM SUB BUS LINE OR CONNECTOR (CAN-H, CAN-L)

28. CONNECT CONNECTOR

(a) Reconnect the navigation ECU sub bus line connector (K95) to the D-CAN J/C B side (w/o earth terminal).

NEXT -- Continue to next step.

29. CHECK CAN BUS LINE FOR SHORT TO GND (NAVIGATION ECU)

(a) Disconnect the navigation ECU connector (K46).

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

Standard resistance:

OK -- REPLACE NAVIGATION ECU

NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO NAVIGATION ECU (CAN-H, CAN-L)