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Check CAN Bus Line for Short to GND





CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: Check CAN Bus Line for Short to GND
- Check CAN Bus Line for Short to GND

DESCRIPTION

There may be a short circuit between the CAN bus line and GND when no resistance exists between terminals 6 (CANH) and 4 (CG) or terminals 14 (CANL) and 4 (CG) of the DLC3.





WIRING DIAGRAM









INSPECTION PROCEDURE

NOTICE:
* Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.
* After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
* Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the ignition switch, any other switches or the doors. If doors need to be opened in order to check connectors, open the doors and leave them open.
HINT
Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.

PROCEDURE

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

(a) Turn the ignition switch off.





(b) Disconnect the F46 D-CAN junction connector.

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

Standard resistance:









NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CAN-H, CAN-L)
OK -- Continue to next step.

2. CONNECT CONNECTOR

(a) Reconnect the D-CAN junction connector.

NEXT -- Continue to next step.

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

(a) Turn the ignition switch off.





(b) Disconnect the F47 P-CAN junction connector.

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





Standard resistance:





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

4. CHECK CAN BUS LINE FOR SHORT TO GND (P-CAN J/C - POWER STEERING ECU)

(a) Measure the resistance according to the values in the table below.





HINT
The resistance must be measured after the F47 P-CAN junction connector is disconnected.

Standard resistance:





NG -- CHECK CAN BUS LINE FOR SHORT TO GND (POWER STEERING ECU MAIN WIRE)
OK -- Continue to next step.

5. CHECK CAN BUS LINE FOR SHORT TO GND (P-CAN J/C - YAW RATE SENSOR)

(a) Measure the resistance according to the values in the table below.





HINT
The resistance must be measured after the F47 P-CAN junction connector is disconnected.

Standard resistance:





NG -- CHECK CAN BUS LINE FOR SHORT TO GND (YAW RATE SENSOR BRANCH WIRE)
OK -- Continue to next step.

6. CHECK CAN BUS LINE FOR SHORT TO GND (P-CAN J/C - COMBINATION METER ECU)

(a) Measure the resistance according to the values in the table below.





HINT
The resistance must be measured after the F47 P-CAN junction connector is disconnected.

Standard resistance:





NG -- CHECK CAN BUS LINE FOR SHORT TO GND (COMBINATION METER ECU BRANCH WIRE)

OK -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (P-CAN J/C - D-CAN J/C (CAN-H, CAN-L))

7. CONNECT CONNECTOR

(a) Reconnect the P-CAN junction connector.

NEXT -- Continue to next step.

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

(a) Disconnect the F46 D-CAN junction connector.





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

Standard resistance:





NG -- CHECK CAN BUS LINE FOR SHORT TO GND (ECM MAIN WIRE)
OK -- Continue to next step.

9. CHECK CAN BUS LINE FOR SHORT TO GND (D-CAN J/C - ABS AND TRACTION ACTUATOR (SKID CONTROL ECU))

(a) Measure the resistance according to the values in the table below.





HINT
The resistance must be measured after the F46 D-CAN junction connector is disconnected.

Standard resistance:





NG -- CHECK CAN BUS LINE FOR SHORT TO GND (ABS AND TRACTION ACTUATOR (SKID CONTROL ECU) BRANCH WIRE)
OK -- Continue to next step.

10. CHECK CAN BUS LINE FOR SHORT TO GND (D-CAN J/C - STEERING SENSOR)

(a) Measure the resistance according to the values in the table below.





HINT
The resistance must be measured after the F46 D-CAN junction connector is disconnected.

Standard resistance:





NG -- CHECK CAN BUS LINE FOR SHORT TO GND (STEERING SENSOR BRANCH WIRE)
OK -- Continue to next step.

11. CHECK CAN BUS LINE FOR SHORT TO GND (D-CAN J/C - AIR CONDITIONING AMPLIFIER)

(a) Measure the resistance according to the values in the table below.





HINT
The resistance must be measured after the F46 D-CAN junction connector is disconnected.

Standard resistance:





NG -- CHECK CAN BUS LINE FOR SHORT TO GND (AIR CONDITIONING AMPLIFIER BRANCH WIRE)
OK -- Continue to next step.

12. CHECK CAN BUS LINE FOR SHORT TO GND (D-CAN J/C - CENTER AIRBAG SENSOR ASSEMBLY)

(a) Measure the resistance according to the values in the table below.





HINT
The resistance must be measured after the F46 D-CAN junction connector is disconnected.

Standard resistance:





NG -- CHECK CAN BUS LINE FOR SHORT TO GND (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE)
OK -- Continue to next step.

13. CHECK CAN BUS LINE FOR SHORT TO GND (D-CAN J/C - MAIN BODY ECU)

(a) Measure the resistance according to the values in the table below.





HINT
The resistance must be measured after the F46 P-CAN junction connector is disconnected.

Standard resistance:





NG -- CHECK CAN BUS LINE FOR SHORT TO GND (MAIN BODY ECU BRANCH WIRE)

OK -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (D-CAN J/C - P-CAN J/C)

14. CHECK CAN BUS LINE FOR SHORT TO GND (POWER STEERING ECU MAIN WIRE)

(a) Disconnect the F30 power steering ECU connector.





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





HINT
The resistance must be measured after the F47 P-CAN junction connector is disconnected.

Standard resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO POWER STEERING ECU (CAN-H, CAN-L)

OK -- REPLACE POWER STEERING ECU Steering

15. CHECK CAN BUS LINE FOR SHORT TO GND (YAW RATE SENSOR BRANCH WIRE)

(a) Disconnect the F34 yaw rate sensor connector.





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





HINT
The resistance must be measured after the F47 P-CAN junction connector is disconnected.

Standard resistance:





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

OK -- REPLACE YAW RATE SENSOR

16. CHECK CAN BUS LINE FOR SHORT TO GND (COMBINATION METER ECU BRANCH WIRE)

(a) Disconnect the F2 combination meter ECU connector.





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





HINT
The resistance must be measured after the F47 P-CAN junction connector is disconnected.

Standard resistance:





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

OK -- REPLACE COMBINATION METER ECU Removal

17. CHECK CAN BUS LINE FOR SHORT TO GND (ECM MAIN WIRE)

(a) Disconnect the A21 ECM connector.





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





HINT
The resistance must be measured after the F46 D-CAN junction connector is disconnected.

Standard resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (CAN-H, CAN-L)

OK -- REPLACE ECM Removal

18. CHECK CAN BUS LINE FOR SHORT TO GND (ABS AND TRACTION ACTUATOR (SKID CONTROL ECU) BRANCH WIRE)

(a) Disconnect the A15 ABS and traction actuator (skid control ECU) connector.





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





HINT
The resistance must be measured after the F46 D-CAN junction connector is disconnected.

Standard resistance:





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO ABS AND TRACTION ACTUATOR (SKID CONTROL ECU) (CAN-H, CAN-L)

OK -- REPLACE ABS AND TRACTION ACTUATOR (SKID CONTROL ECU) Removal

19. CHECK CAN BUS LINE FOR SHORT TO GND (STEERING SENSOR BRANCH WIRE)

(a) Disconnect the F33 steering sensor connector.





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





HINT
The resistance must be measured after the F46 D-CAN junction connector is disconnected.

Standard resistance:





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO STEERING SENSOR (CAN-H, CAN-L)

OK -- REPLACE STEERING SENSOR Removal

20. CHECK CAN BUS LINE FOR SHORT TO GND (AIR CONDITIONING AMPLIFIER BRANCH WIRE)

(a) Disconnect the G7 air conditioning amplifier connector.





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





HINT
The resistance must be measured after the F46 D-CAN junction connector is disconnected.

Standard resistance:





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO AIR CONDITIONING AMPLIFIER (CAN-H, CAN-L)

OK -- REPLACE AIR CONDITIONING AMPLIFIER Removal

21. CHECK CAN BUS LINE FOR SHORT TO GND (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE)

(a) Disconnect the F18 center airbag sensor assembly connector.





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





HINT
The resistance must be measured after the F46 D-CAN junction connector is disconnected.

Standard resistance:





NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO CENTER AIRBAG SENSOR ASSEMBLY (CAN-H, CAN-L)

OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal

22. CHECK CAN BUS LINE FOR SHORT TO GND (MAIN BODY ECU BRANCH WIRE)

(a) Disconnect the F38 main body ECU connector.





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





HINT
The resistance must be measured after the F46 D-CAN junction connector is disconnected.

Standard resistance:





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

OK -- REPLACE MAIN BODY ECU
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