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 there is resistance between terminals 6 (CANH) and 4 (CG) or terminals 14 (CANL) and 4 (CG) of the DLC3.

HINT: *: w/ Accessory

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 C48 CAN center junction connector.

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 CAN center junction connector.
NEXT -- Continue to next step.
3. CHECK CAN BUS LINE FOR SHORT TO GND (CAN LH J/C SIDE)

(a) Turn the ignition switch off.
(b) Disconnect the A33 CAN LH junction connector.

NG -- CONNECT CONNECTOR
OK -- Continue to next step.
4. CHECK CAN BUS LINE FOR SHORT TO GND (CAN LH J/C - ECM)

(a) Measure the resistance according to the value(s) in the table below.
HINT: The resistance must be measured after the A33 CAN LH junction connector is disconnected.

Standard Resistance:

NG -- CHECK CAN BUS LINE FOR SHORT TO GND (ECM MAIN WIRE)
OK -- Continue to next step.
5. CHECK CAN BUS LINE FOR SHORT TO GND (CAN LH J/C - ABS AND TRACTION ACTUATOR (SKID CONTROL ECU))

(a) Measure the resistance according to the value(s) in the table below.
HINT: The resistance must be measured after the A33 CAN LH 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 -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN LH J/C - CAN CENTER J/C (CAN-H, CAN-L))
6. CONNECT CONNECTOR
(a) Reconnect the CAN LH junction connector.
NEXT -- Continue to next step.
7. CHECK CAN BUS LINE FOR SHORT TO GND (CAN CENTER J/C - COMBINATION METER ECU)

(a) Disconnect the C48 CAN center junction connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:

NG -- CHECK CAN BUS LINE FOR SHORT TO GND (COMBINATION METER ECU MAIN WIRE)
OK -- Continue to next step.
8. CHECK CAN BUS LINE FOR SHORT TO GND (CAN CENTER J/C - POWER STEERING ECU)

(a) Measure the resistance according to the value(s) in the table below.
HINT: The resistance must be measured after the C48 CAN center junction connector is disconnected.

Standard Resistance:

NG -- CHECK CAN BUS LINE FOR SHORT TO GND (POWER STEERING ECU BRANCH WIRE)
OK -- Continue to next step.
9. CHECK CAN BUS LINE FOR SHORT TO GND (CAN CENTER J/C - YAW RATE SENSOR)

NG -- CHECK CAN BUS LINE FOR SHORT TO GND (YAW RATE SENSOR BRANCH WIRE)
OK -- Continue to next step.
10. CHECK CAN BUS LINE FOR SHORT TO GND (CAN CENTER J/C - STEERING SENSOR)

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 (CAN CENTER J/C - AIR CONDITIONING AMPLIFIER)

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 (CAN CENTER J/C - CENTER AIRBAG SENSOR ASSEMBLY)

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 (CAN CENTER J/C - MAIN BODY ECU)

NG -- CHECK CAN BUS LINE FOR SHORT TO GND (MAIN BODY ECU BRANCH WIRE)
OK -- Continue to next step.
14. CHECK CAN BUS LINE FOR SHORT TO GND (CAN CENTER J/C - ACCESSORY BUS BUFFER)

NG -- CHECK CAN BUS LINE FOR SHORT TO GND (ACCESSORY BUS BUFFER BRANCH WIRE)
OK -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN CENTER J/C - CAN LH J/C)
15. CHECK CAN BUS LINE FOR SHORT TO GND (COMBINATION METER ECU MAIN WIRE)

(a) Disconnect the C37 combination meter ECU connector.

(b) Measure the resistance according to the value(s) in the table below.
HINT: The resistance must be measured after the C48 CAN center junction connector is disconnected.

Standard Resistance:

NG -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO COMBINATION METER ECU (CAN-H, CAN-L)
OK -- REPLACE COMBINATION METER ASSEMBLY
16. CHECK CAN BUS LINE FOR SHORT TO GND (POWER STEERING ECU BRANCH WIRE)

(a) Disconnect the C34 power steering ECU connector.

NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO POWER STEERING ECU (CAN-H, CAN-L)
OK -- REPLACE POWER STEERING ECU
17. CHECK CAN BUS LINE FOR SHORT TO GND (YAW RATE SENSOR BRANCH WIRE)

(a) Disconnect the C43 yaw rate sensor connector.

NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO YAW RATE SENSOR (CAN-H, CAN-L)
OK -- REPLACE YAW RATE SENSOR
18. CHECK CAN BUS LINE FOR SHORT TO GND (STEERING SENSOR BRANCH WIRE)

(a) Disconnect the C44 steering sensor connector.

NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO STEERING SENSOR (CAN-H, CAN-L)
OK -- REPLACE STEERING SENSOR
19. CHECK CAN BUS LINE FOR SHORT TO GND (AIR CONDITIONING AMPLIFIER BRANCH WIRE)

(a) Disconnect the C8 air conditioning amplifier connector.

NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO AIR CONDITIONING AMPLIFIER (CAN-H, CAN-L)
OK -- REPLACE AIR CONDITIONING AMPLIFIER
20. CHECK CAN BUS LINE FOR SHORT TO GND (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE)

(a) Disconnect the C17 center airbag sensor assembly connector.

NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO CENTER AIRBAG SENSOR ASSEMBLY (CAN-H, CAN-L)
OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY
21. CHECK CAN BUS LINE FOR SHORT TO GND (MAIN BODY ECU BRANCH WIRE)

(a) Disconnect the C45 main body ECU connector.

NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO MAIN BODY ECU (CAN-H, CAN-L)
OK -- REPLACE MAIN BODY ECU
22. CHECK CAN BUS LINE FOR SHORT TO GND (ACCESSORY BUS BUFFER BRANCH WIRE)

(a) Disconnect the C26 accessory bus buffer connector.

NG -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO ACCESSORY BUS BUFFER
OK -- CHECK ACCESSORY CIRCUIT
23. CHECK CAN BUS LINE FOR SHORT TO GND (ECM MAIN WIRE)

(a) Disconnect the A36 ECM connector.

(b) Measure the resistance according to the value(s) in the table below.
HINT: The resistance must be measured after the A33 CAN LH junction connector is disconnected.

Standard Resistance:

NG -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (CAN-H, CAN-L)
OK -- REPLACE ECM
24. CHECK CAN BUS LINE FOR SHORT TO GND (ABS AND TRACTION ACTUATOR (SKID CONTROL ECU) BRANCH WIRE)

(a) Disconnect the A37 ABS and traction actuator (skid control ECU) connector.

(b) Measure the resistance according to the value(s) in the table below.
HINT: The resistance must be measured after the A33 CAN LH 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)