Open in CAN Main Bus Line

CAN COMMUNICATION: CAN COMMUNICATION SYSTEM: Open in CAN Main Bus Line
- Open in CAN Main Bus Line

DESCRIPTION

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





WIRING DIAGRAM









INSPECTION PROCEDURE

NOTICE:
* Turn the ignition switch off before measuring the resistance of the CAN main wire and CAN branch wires.
* After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
* 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 other switches or any triggers related ECU and sensor communication on the CAN, which would cause resistance reading variations.

PROCEDURE

1. CHECK DLC3

(a) Turn the ignition switch off.





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

Standard resistance:





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 DLC3 BRANCH WIRE OR CONNECTOR (CANH, CANL)
A -- Continue to next step.

2. CHECK FOR OPEN IN CAN BUS MAIN WIRE (COMBINATION METER MAIN BUS WIRE)

(a) Disconnect the CAN main bus wire white connector (E43) from the No. 1 CAN J/C "B" side (without earth terminal).





HINT
E43 connector color: White

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

Standard resistance:





NG -- CHECK FOR OPEN IN CAN BUS MAIN WIRE (COMBINATION METER - NO. 1 CAN J/C)
OK -- Continue to next step.

3. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 CAN J/C)

(a) Reconnect the CAN main bus wire connector (E43) to the No. 1 CAN J/C "B" side (without earth terminal).





(b) Disconnect the CAN main bus wire white connector (E42) from the No. 1 CAN J/C "A" side (with earth terminal).

HINT
E42 connector color: White

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

Standard resistance:





OK -- REPLACE NO. 1 CAN J/C
NG -- Continue to next step.

4. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 1 CAN J/C - NO. 2 CAN J/C)

(a) Reconnect the CAN main bus wire connector (E42) to the No. 1 CAN J/C "A" side (with earth terminal).





(b) Disconnect the CAN main bus wire connector (E41) from the No. 2 CAN J/C (front of the vehicle).

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

Standard resistance:





NG -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (NO. 1 CAN J/C - NO. 2 CAN J/C)
OK -- Continue to next step.

5. CHECK FOR OPEN IN CAN BUS MAIN WIRE (NO. 2 CAN J/C)

(a) Reconnect the CAN main bus wire connector (E41) to the No. 2 CAN J/C (front of the vehicle).





(b) Disconnect the CAN main bus wire connector (A40) from the No. 2 CAN J/C (rear of the vehicle).

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

Standard resistance:





OK -- REPLACE NO. 2 CAN J/C
NG -- Continue to next step.

6. CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM CAN MAIN BUS WIRE)

(a) Reconnect the CAN main bus wire connector (A40) to the No. 2 CAN J/C (rear of the vehicle).





(b) Disconnect the ECM connector.

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

Standard resistance:

2AR-FE
2GR-FE










OK -- REPLACE ECM

NG -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (NO. 2 CAN J/C - ECM)

7. CHECK FOR OPEN IN CAN BUS MAIN WIRE (COMBINATION METER - NO. 1 CAN J/C)

(a) Reconnect the CAN main bus wire connector (E43) to the No. 1 CAN J/C "B" side (without earth terminal).





(b) Disconnect the combination meter connector (F1).

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

Standard resistance:





OK -- REPLACE COMBINATION METER

NG -- REPAIR OR REPLACE CAN BUS MAIN WIRE OR CONNECTOR (NO. 1 CAN J/C - COMBINATION METER)