Can Communication System Open In Can Main Bus Line

Power Source Network. Corolla. Zre142 Aze141
Networking. Corolla. Zre142 Aze141

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK DLC3

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

CHECK FOR OPEN IN CAN BUS MAIN WIRE (ECM)

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

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

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

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

CAN COMMUNICATION SYSTEM - Open in CAN Main Bus Line


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 Ω or higher.

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

WIRING DIAGRAM


Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Open In Can Main Bus Line


Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Open In Can Main Bus Line


INSPECTION PROCEDURE

NOTICE:
  1. Turn the ignition switch off before measuring the resistance between main CAN bus wires and CAN Bus branch wires.
  2. After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.
  3. 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 any doors need to be opened in order to check the connectors, open the doors and leave them open.
HINT:
  1. Operating the ignition 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 DLC3


    Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Open In Can Main Bus Line

  1. Turn the ignition switch off.

    Text in Illustration
    *1
    		DLC3

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E11-6 (CANH) - E11-14 (CANL)
    		Ignition switch off
    		108 to 132 Ω
    NOTICE:
    When the measured value is 132 Ω or higher 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 (COROLLA_ZRE142 RM000000WI60ACX.html) after repairing the trouble area.


NG
REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3
OK


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


    Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Open In Can Main Bus Line

  1. Turn the ignition switch off.

    Text in Illustration
    *a
    		Front view of wire harness connector
    (to CAN No. 2 Junction Connector)

  1. Disconnect the CAN No. 2 junction connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A49-6 (CANH) - A49-4 (CANL)
    		Ignition switch off
    		108 to 132 Ω


NG
Go to step 5
OK


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

  1. Turn the ignition switch off.

  1. Reconnect the CAN No. 2 junction connector.

  1. Disconnect the ECM connector.



    Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Open In Can Main Bus Line

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

    Text in Illustration
    *a
    		Front view of wire harness connector
    (to ECM)
    *b
    		for 2AZ-FE
    *c
    		for 2ZR-FE
    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A50-41 (CANH) - A50-49 (CANL)*1
    		Ignition switch off
    		108 to 132 Ω
    A50-8 (CANH) - A50-9 (CANL)*2
    		Ignition switch off
    		108 to 132 Ω
    *1: for 2AZ-FE
    *2: for 2ZR-FE
Result:
Result
Proceed to
OK (for 2ZR-FE)
A
OK (for 2AZ-FE)
B
NG
C


B
REPLACE ECM (COROLLA_ZRE142 RM000002WT506MX.html)

C
Go to step 4
A

REPLACE ECM (COROLLA_ZRE142 RM000001CN0030X.html)

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


    Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Open In Can Main Bus Line

  1. Reconnect the ECM connector.

    Text in Illustration
    *a
    		Front view of wire harness connector
    (to CAN No. 2 Junction Connector)

  1. Turn the ignition switch off.

  1. Disconnect the CAN No. 2 junction connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A48-2 (CANH) - A48-4 (CANL)
    		Ignition switch off
    		108 to 132 Ω


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

REPLACE CAN NO. 2 JUNCTION CONNECTOR

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


    Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Open In Can Main Bus Line

  1. Reconnect the CAN No. 2 junction connector.

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

  1. Turn the ignition switch off.

  1. Disconnect the combination meter connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    E46-27 (CANH) - E46-28 (CANL)
    		Ignition switch off
    		108 to 132 Ω


NG
Go to step 6
OK

REPLACE COMBINATION METER ASSEMBLY (COROLLA_ZRE142 RM0000024D7032X.html)

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

  1. Reconnect the combination meter connector.

  1. Turn the ignition switch off.



  1. TMC made:



      Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Open In Can Main Bus Line

    1. Disconnect the CAN No. 1 junction connector.

      Text in Illustration
      *a
      		Front view of wire harness connector
      (to CAN No. 1 Junction Connector)

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

      Standard Resistance:
      Tester Connection
      		Switch Condition
      		Specified Condition
      E58-2 (CANH) - E58-13 (CANL)
      		Ignition switch off
      		108 to 132 Ω


  1. Except TMC made:



      Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Open In Can Main Bus Line

    1. Disconnect the CAN No. 1 junction connector.

      Text in Illustration
      *a
      		Front view of wire harness connector
      (to CAN No. 1 Junction Connector)

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

      Standard Resistance:
      Tester Connection
      		Switch Condition
      		Specified Condition
      E71-4 (CANH) - E71-15 (CANL)
      		Ignition switch off
      		108 to 132 Ω


NG
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN NO. 1 JUNCTION CONNECTOR - COMBINATION METER)
OK


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


  1. TMC made:



      Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Open In Can Main Bus Line

    1. Disconnect the CAN No. 1 junction connector.

      Text in Illustration
      *a
      		Front view of wire harness connector
      (to CAN No. 1 Junction Connector)

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

      Standard Resistance:
      Tester Connection
      		Switch Condition
      		Specified Condition
      E58-10 (CANH) - E58-21 (CANL)
      		Ignition switch off
      		108 to 132 Ω


  1. Except TMC made:



      Corolla. Zre142 Aze141.Networking.Lin Communication System.Can Communication System Open In Can Main Bus Line

    1. Disconnect the CAN No. 1 junction connector.

      Text in Illustration
      *a
      		Front view of wire harness connector
      (to CAN No. 1 Junction Connector)

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

      Standard Resistance:
      Tester Connection
      		Switch Condition
      		Specified Condition
      E71-6 (CANH) - E71-17 (CANL)
      		Ignition switch off
      		108 to 132 Ω


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

REPLACE CAN NO. 1 JUNCTION CONNECTOR