CAN COMMUNICATION SYSTEM > Open in CAN Main Bus Line

for Preparation Click here


DESCRIPTION

There may be an open circuit one of the CAN V1 bus main lines and/or a DLC3 branch line when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is 70 Ω or higher.

Symptom
Trouble Area
Resistance between terminals 6 (CANH) and 14 (CANL) of DLC3 is 70 Ω or higher.
  1. DLC3 branch line or connector
  2. CAN main bus line or connector
  3. ECM
  4. Combination meter assembly
  5. CAN No. 1 junction connector
  6. CAN No. 2 junction connector
  7. CAN No. 3 junction connector

WIRING DIAGRAM


C236215E01


INSPECTION PROCEDURE

NOTICE:
  1. Turn the power switch off before measuring the resistances between CAN main bus lines and between CAN branch lines.
  2. Turn the power switch off before inspecting CAN bus lines for a ground short.
  3. After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
  4. Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

HINT:
  1. Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.
  2. Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

1.CHECK FOR OPEN IN CAN BUS LINES (DLC3 BRANCH LINE)

  1. Turn the power switch off.



    C210421E31

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H44-6 (CANH) - H44-14 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *1
    		DLC3

    NOTICE:
    When the measured value is 133 Ω or higher and a CAN communication system DTC is output, there may be a fault besides disconnection of the DLC3 branch line. For that reason, troubleshooting should be performed again from How to Proceed with Troubleshooting after repairing the trouble area (Click here).



NG
REPAIR OR REPLACE CAN BRANCH LINE CONNECTED TO DLC3
OK


2.CHECK FOR OPEN IN CAN BUS LINES (ECM)


    C188240E06

  1. Disconnect the ECM connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A60-13 (CANH) - A60-5 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to ECM)



NG
Go to step 3
OK

REPLACE ECM (Click here)  

3.CHECK FOR OPEN IN CAN BUS LINES (COMBINATION METER ASSEMBLY)

  1. Reconnect the ECM connector.



    C188241E84

  1. Disconnect the combination meter assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    H19-32 (CANH) - H19-31 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to Combination Meter Assembly)



NG
Go to step 4
OK

REPLACE COMBINATION METER ASSEMBLY (Click here)  

4.CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 2 J/C)

  1. Reconnect the combination meter assembly connector.



    C214272E72

  1. Disconnect the wire harness connector from the CAN No. 2 junction connector rear side.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    		Connected to
    H104-1 (CANH) - H104-2 (CANL)
    		Power switch off
    		108 to 132 Ω
    		CAN No. 1 junction connector
    H104-4 (CANH) - H104-5 (CANL)
    		Power switch off
    		108 to 132 Ω
    		CAN No. 3 junction connector

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 2 Junction Connector Rear Side)
    *b
    		to CAN No. 1 Junction Connector
    *c
    		to CAN No. 3 Junction Connector

    Result:
    Result
    		Proceed to
    OK
    		A
    NG (CAN No. 1 junction connector main line)
    		B
    NG (CAN No. 3 junction connector main line)
    		C



B
Go to step 5

C
Go to step 7
A

REPLACE CAN NO. 2 JUNCTION CONNECTOR 

5.CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 2 J/C - CAN NO. 1 J/C)

  1. Reconnect the wire harness connector to the CAN No. 2 junction connector rear side.



    C234634E26

  1. Disconnect the instrument panel wire from the CAN No. 1 junction connector.

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

    Standard Resistance:
    for LHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    H112-6 (CANH) - H112-12 (CANL)
    		Power switch off
    		108 to 132 Ω
    for RHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    H141-6 (CANH) - H141-12 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 1 Junction Connector)
    *b
    		to CAN No. 2 Junction Connector
    *c
    		for LHD
    *d
    		for RHD



NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 2 J/C)
OK


6.CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 1 J/C - ECM)


    C234634E27

  1. Disconnect the engine room main wire from the CAN No. 1 junction connector.

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

    Standard Resistance:
    for LHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    A57-1 (CANH) - A57-7 (CANL)
    		Power switch off
    		108 to 132 Ω
    for RHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    A71-1 (CANH) - A71-7 (CANL)
    		Power switch off
    		108 to 132 Ω

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 1 Junction Connector)
    *b
    		to ECM
    *c
    		for LHD
    *d
    		for RHD



NG
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - ECM)
OK

REPLACE CAN NO. 1 JUNCTION CONNECTOR 

7.CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 3 J/C)

  1. Reconnect the wire harness connector to the CAN No. 2 junction connector rear side.



    C234634E28

  1. Disconnect the instrument panel wire from the CAN No. 3 junction connector.

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

    Standard Resistance:
    for LHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    		Connected to
    H113-5 (CANH) - H113-11 (CANL)
    		Power switch off
    		108 to 132 Ω
    		CAN No. 2 junction connector
    H113-6 (CANH) - H113-12 (CANL)
    		Power switch off
    		108 to 132 Ω
    		Combination meter assembly
    for RHD 
    Tester Connection
    		Switch Condition
    		Specified Condition
    		Connected to
    H142-5 (CANH) - H142-11 (CANL)
    		Power switch off
    		108 to 132 Ω
    		CAN No. 2 junction connector
    H142-6 (CANH) - H142-12 (CANL)
    		Power switch off
    		108 to 132 Ω
    		Combination meter assembly

    Text in Illustration 
    *a
    		Front view of wire harness connector
    (to CAN No. 3 Junction Connector)
    *b
    		to CAN No. 2 Junction Connector
    *c
    		to Combination Meter Assembly
    *d
    		for LHD
    *e
    		for RHD

    Result:
    Result
    		Proceed to
    OK
    		A
    NG (CAN No. 2 junction connector main line)
    		B
    NG (Combination meter assembly main line)
    		C



B
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 2 J/C - CAN NO. 3 J/C)

C
REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 3 J/C - COMBINATION METER ASSEMBLY)
A

REPLACE CAN NO. 3 JUNCTION CONNECTOR