Check CAN Bus Lines for Short Circuit

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: Check CAN Bus Lines for Short Circuit

Check CAN Bus Lines for Short Circuit

DESCRIPTION

There may a short circuit in the CAN main wire and/or CAN branch wire when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54Ohms.

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 LINES FOR SHORT CIRCUIT (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 LINES FOR SHORT CIRCUIT (CAN LH J/C)

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

NG -- CHECK CAN BUS LINES FOR SHORT CIRCUIT (CAN CENTER J/C - CAN LH J/C)
OK -- Continue to next step.
4. CHECK CAN BUS LINES FOR SHORT CIRCUIT (CAN LH J/C - ECM)

(a) Measure the resistance according to the value 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 LINES FOR SHORT CIRCUIT (ECM MAIN WIRE)
OK -- Continue to next step.
5. CHECK CAN BUS LINES FOR SHORT CIRCUIT (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 LINES FOR SHORT CIRCUIT (ABS AND TRACTION ACTUATOR (SKID CONTROL ECU) BRANCH WIRE)
OK -- REPLACE CAN LH J/C
6. CHECK CAN BUS LINES FOR SHORT CIRCUIT (CAN CENTER J/C - CAN LH J/C)

(a) Turn the ignition switch off.
(b) Disconnect the C48 CAN center junction connector.
(c) 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 OR CONNECTOR (CAN CENTER J/C - CAN LH J/C)
OK -- Continue to next step.
7. CONNECT CONNECTOR
(a) Reconnect the CAN LH junction connector.
NEXT -- Continue to next step.
8. CHECK CAN BUS LINES FOR SHORT CIRCUIT (CAN CENTER J/C - COMBINATION METER ECU)

(a) Measure the resistance according to the value 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 LINES FOR SHORT CIRCUIT (COMBINATION METER ECU MAIN WIRE)
OK -- Continue to next step.
9. CHECK CAN BUS LINES FOR SHORT CIRCUIT (CAN CENTER J/C - MAIN BODY 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 LINES FOR SHORT CIRCUIT (MAIN BODY ECU BRANCH WIRE)
OK -- Continue to next step.
10. CHECK CAN BUS LINES FOR SHORT CIRCUIT (CAN CENTER J/C - CENTER AIRBAG SENOR ASSEMBLY)

NG -- CHECK CAN BUS LINES FOR SHORT CIRCUIT (CENTER AIRBAG SENSOR ASSEMBLY BRANCH WIRE)
OK -- Continue to next step.
11. CHECK CAN BUS LINES FOR SHORT CIRCUIT (CAN CENTER J/C - AIR CONDITIONING AMPLIFIER)

NG -- CHECK CAN BUS LINES FOR SHORT CIRCUIT (AIR CONDITIONING AMPLIFIER BRANCH WIRE)
OK -- Continue to next step.
12. CHECK CAN BUS LINES FOR SHORT CIRCUIT (CAN CENTER J/C - POWER STEERING ECU)

NG -- CHECK CAN BUS LINES FOR SHORT CIRCUIT (POWER STEERING ECU BRANCH WIRE)
OK -- Continue to next step.
13. CHECK CAN BUS LINES FOR SHORT CIRCUIT (CAN CENTER J/C - STEERING SENSOR)

NG -- CHECK CAN BUS LINES FOR SHORT CIRCUIT (STEERING SENSOR BRANCH WIRE)
OK -- Continue to next step.
14. CHECK CAN BUS LINES FOR SHORT CIRCUIT (CAN CENTER J/C - ACCESSORY BUS BUFFER)
HINT: For vehicle without accessory, go to step 13.

NG -- CHECK CAN BUS LINES FOR SHORT CIRCUIT (ACCESSORY BUS BUFFER BRANCH WIRE)
OK -- Continue to next step.
15. CHECK CAN BUS LINES FOR SHORT CIRCUIT (CAN CENTER J/C - YAW RATE SENSOR)

NG -- CHECK CAN BUS LINES FOR SHORT CIRCUIT (YAW RATE SENSOR BRANCH WIRE)
OK -- REPLACE CAN CENTER J/C
16. CHECK CAN BUS LINES FOR SHORT CIRCUIT (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
17. CHECK CAN BUS LINES FOR SHORT CIRCUIT (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
18. CHECK CAN BUS LINES FOR SHORT CIRCUIT (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
19. CHECK CAN BUS LINES FOR SHORT CIRCUIT (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 LINES FOR SHORT CIRCUIT (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
21. CHECK CAN BUS LINES FOR SHORT CIRCUIT (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
22. CHECK CAN BUS LINES FOR SHORT CIRCUIT (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 (CAN-H, CAN-L)
OK -- CHECK ACCESSORY CIRCUIT
23. CHECK CAN BUS LINES FOR SHORT CIRCUIT (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
24. CHECK CAN BUS LINES FOR SHORT CIRCUIT (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
25. CHECK CAN BUS LINES FOR SHORT CIRCUIT (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)