Check CAN Bus Lines for Short Circuit
NETWORKING: CAN COMMUNICATION SYSTEM: Check CAN Bus Lines for Short Circuit
- Check CAN Bus Lines for Short Circuit
DESCRIPTION
There may be 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 54 Ohms.
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 FOR SHORT IN CAN BUS WIRES (DLC3 BRANCH WIRE)
(a) Turn the ignition switch off.
(b) Disconnect the D71 CAN No. 2 junction connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
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 No. 2 junction connector.
NEXT -- Continue to next step.
3. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C)
(a) Turn the ignition switch off.
(b) Disconnect the A49 CAN No. 1 junction connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - CAN NO. 2 J/C)
OK -- Continue to next step.
4. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - ECM)
(a) Measure the resistance according to the value(s) in the table below.
HINT
The resistance must be measured after the A49 CAN No. 1 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- CHECK FOR SHORT IN CAN BUS WIRES (ECM)
OK -- Continue to next step.
5. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - SKID CONTROL ECU)
(a) Measure the resistance according to the value(s) in the table below.
HINT
The resistance must be measured after the A49 CAN No. 1 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- CHECK FOR SHORT IN CAN BUS WIRES (SKID CONTROL ECU)
OK -- REPLACE CAN NO. 1 JUNCTION CONNECTOR
6. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - CAN NO. 2 J/C)
(a) Turn the ignition switch off.
(b) Disconnect the D71 CAN No. 2 junction connector.
(c) Measure the resistance according to the value(s) in the table below.
HINT
The resistance must be measured after the A49 CAN No. 1 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN-H, CAN-L)
OK -- Continue to next step.
7. CONNECT CONNECTOR
(a) Reconnect the CAN No. 1 junction connector.
NEXT -- Continue to next step.
8. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - COMBINATION METER ECU)
(a) Measure the resistance according to the value(s) in the table below.
HINT
The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER ECU)
OK -- Continue to next step.
9. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - AIR CONDITIONING AMPLIFIER ASSEMBLY)
(a) Measure the resistance according to the value(s) in the table below.
HINT
The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- CHECK FOR SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER ASSEMBLY)
OK -- Continue to next step.
10. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 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 D71 CAN No. 2 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU)
OK -- Continue to next step.
11. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - STEERING SENSOR)
(a) Measure the resistance according to the value(s) in the table below.
HINT
The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- CHECK FOR SHORT IN CAN BUS WIRES (STEERING SENSOR)
OK -- Continue to next step.
12. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - CENTER AIRBAG SENSOR ASSEMBLY)
(a) Measure the resistance according to the value(s) in the table below.
HINT
The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- CHECK FOR SHORT IN CAN BUS WIRES (CENTER AIRBAG SENSOR ASSEMBLY)
OK -- Continue to next step.
13. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - YAW RATE SENSOR)
(a) Measure the resistance according to the value(s) in the table below.
HINT
The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- CHECK FOR SHORT IN CAN BUS WIRES (YAW RATE SENSOR)
OK -- Continue to next step.
14. CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 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 D71 CAN No. 2 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- CHECK FOR SHORT IN CAN BUS WIRES (POWER STEERING ECU)
OK -- REPLACE CAN NO. 2 JUNCTION CONNECTOR
15. CHECK FOR SHORT IN CAN BUS WIRES (ECM)
(a) Disconnect the A18 ECM connector.
(b) Measure the resistance according to the value(s) in the table below.
HINT
The resistance must be measured after the A49 CAN No. 1 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN-H, CAN-L)
OK -- REPLACE ECM Removal
16. CHECK FOR SHORT IN CAN BUS WIRES (SKID CONTROL ECU)
(a) Disconnect the A16 brake actuator assembly (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 A49 CAN No. 1 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L)
OK -- REPLACE BRAKE ACTUATOR ASSEMBLY Removal
17. CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER ECU)
(a) Disconnect the D1 combination meter assembly (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 D71 CAN No. 2 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN-H, CAN-L)
OK -- REPLACE COMBINATION METER ASSEMBLY Removal
18. CHECK FOR SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER ASSEMBLY)
(a) Disconnect the D16 air conditioning amplifier assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
HINT
The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L)
OK -- REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Removal
19. CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU)
(a) Disconnect the D42 main body ECU connector.
(b) Measure the resistance according to the value(s) in the table below.
HINT
The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L)
OK -- REPLACE MAIN BODY ECU Removal
20. CHECK FOR SHORT IN CAN BUS WIRES (STEERING SENSOR)
(a) Disconnect the D20 spiral cable sub-assembly (steering sensor) connector.
(b) Measure the resistance according to the value(s) in the table below.
HINT
The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L)
OK -- REPLACE SPIRAL CABLE SUB-ASSEMBLY Removal
21. CHECK FOR SHORT IN CAN BUS WIRES (CENTER AIRBAG SENSOR ASSEMBLY)
(a) Disconnect the D43 center airbag sensor assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
HINT
The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L)
OK -- REPLACE CENTER AIRBAG SENSOR ASSEMBLY Removal
22. CHECK FOR SHORT IN CAN BUS WIRES (YAW RATE SENSOR)
(a) Disconnect the D58 yaw rate sensor connector.
(b) Measure the resistance according to the value(s) in the table below.
HINT
The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L)
OK -- REPLACE YAW RATE SENSOR Removal
23. CHECK FOR SHORT IN CAN BUS WIRES (POWER STEERING ECU)
(a) Disconnect the D51 steering column assembly (power steering ECU) connector.
(b) Measure the resistance according to the value(s) in the table below.
HINT
The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.
Standard Resistance:
Text in Illustration
NG -- REPAIR OR REPLACE CAN BRANCH WIRE OR CONNECTOR (CAN-H, CAN-L)
OK -- REPLACE STEERING COLUMN ASSEMBLY Removal