Open In CAN Main Wire

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: Open in CAN Main Wire
- Open in CAN Main Wire

DESCRIPTION

There may be an open circuit in the CAN main wire and/or the DLC3 branch wire when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 70 Ohms or higher.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* Turn the ignition switch off before measuring the resistance of the main wire and the branch wire.
* After the ignition switch is turned off, check that the key reminder warning system and light reminder buzzer are not in operation.
* Before measuring the resistance, leave the vehicle for at least 1 minute and do not operate the ignition switch, any switches or 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. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

(a) Disconnect the cable from the negative (-) battery terminal before measuring the resistance of the main wire and the branch wire.

CAUTION:
Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.

NOTICE:
When disconnecting the cable, some systems need to be initialized after the cable is reconnected.

NEXT -- Continue to next step.

2. CHECK DLC3

(a) Measure the resistance of the DLC3.





Result





NOTICE:
When the measured value is 133 Ohms or more and a CAN communication system diagnostic trouble code is output, there may be a fault besides disconnection of the DLC3 branch wire. For that reason, troubleshooting should be performed again from "How to Proceed with Troubleshooting" How to Proceed With Troubleshooting after repairing the trouble area.

B -- REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CANH, CANL)
A -- Continue to next step.

3. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 JUNCTION CONNECTOR - ECM)

(a) Disconnect the E68 No. 2 junction connector.





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

Standard Resistance:





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

4. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 JUNCTION CONNECTOR - COMBINATION METER)

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





Standard Resistance:





NG -- CONNECT CONNECTOR

OK -- REPLACE NO. 2 JUNCTION CONNECTOR

5. CONNECT CONNECTOR

(a) Reconnect the E68 No. 2 junction connector.

NEXT -- Continue to next step.

6. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR - ECM)

(a) Disconnect the A36 No. 1 junction connector.





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

Standard Resistance:





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

7. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

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





Standard Resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

OK -- REPLACE NO. 1 JUNCTION CONNECTOR

8. CONNECT CONNECTOR

(a) Reconnect the A36 No. 1 junction connector.

NEXT -- Continue to next step.

9. CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM - NO. 1 JUNCTION CONNECTOR)

(a) Disconnect the A9 ECM connector.





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

Standard Resistance:

for 2GR-FE
for 2AR-FE










Result





C -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (ECM - NO. 1 JUNCTION CONNECTOR)

B -- REPLACE ECM Removal

A -- REPLACE ECM Removal

10. CONNECT CONNECTOR

(a) Reconnect the E68 No. 2 junction connector.

NEXT -- Continue to next step.

11. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 4 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

(a) Disconnect the E69 No. 4 junction connector.





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

Standard Resistance:





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

12. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 4 JUNCTION CONNECTOR - COMBINATION METER)

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





Standard Resistance:





NG -- CONNECT CONNECTOR

OK -- REPLACE NO. 4 JUNCTION CONNECTOR

13. CONNECT CONNECTOR

(a) Reconnect the E69 No. 4 junction connector.

NEXT -- Continue to next step.

14. CHECK FOR OPEN IN CAN BUS MAIN WIRE (COMBINATION METER - NO. 4 JUNCTION CONNECTOR)

(a) Disconnect the E19 combination meter assembly (combination meter ECU) connector.





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

Standard Resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO COMBINATION METER ASSEMBLY (COMBINATION METER - NO. 4 JUNCTION CONNECTOR)

OK -- REPLACE COMBINATION METER ASSEMBLY Removal

15. CONNECT CONNECTOR

(a) Reconnect the E69 No. 4 junction connector.

NEXT -- Continue to next step.

16. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 JUNCTION CONNECTOR - NO. 3 JUNCTION CONNECTOR)

(a) Disconnect the E70 No. 3 junction connector.





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

Standard Resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)
OK -- Continue to next step.

17. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 3 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)

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





Standard Resistance:





NG -- REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 4 JUNCTION CONNECTOR)

OK -- REPLACE NO. 3 JUNCTION CONNECTOR