CAN COMMUNICATION SYSTEM > CAN Main Wire for Disconnection (w/o Stop and Start System)

for Preparation Click here


DESCRIPTION

There may be an open circuit in the 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 main wire or connector
  2. CAN No. 1 junction connector
  3. CAN No. 2 junction connector
  4. ECM
  5. Combination meter assembly (combination meter ECU)

WIRING DIAGRAM


E175997E02


INSPECTION PROCEDURE

NOTICE:
  1. Turn the ignition switch off before measuring the resistances of the CAN main wire and the CAN branch wire.
  2. After the ignition switch is turned off, check that the key reminder warning system and light reminder warning system are not in operation.
  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 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.

1.CHECK DLC3

  1. Turn the ignition switch off.



    E175996E01

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D47-6 (CANH) - D47-14 (CANL)
    		Ignition switch off
    		108 to 132 Ω

    Text in Illustration 
    *1
    		Front view of DLC3

    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" (Click here) after repairing the trouble area.



NG
REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CAN-H, CAN-L)
OK


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

  1. Turn the ignition switch off.



    E175998E01

  1. Disconnect the A49 CAN No. 1 junction connector.

  1. Measure the resistance according to the value in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A49-2 (CANH) - A49-1 (CANL)
    		Ignition switch off
    		108 to 132 Ω

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



NG
Go to step 7
OK


3.CONNECT CONNECTOR

  1. Reconnect the CAN No. 1 junction connector.


NEXT


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

  1. Turn the ignition switch off.



    E176012E02

  1. Disconnect the A18 or A19 ECM connector.

  1. Measure the resistance according to the value in the table below.

    Standard Resistance::
    for 1KR-FE and 1NR-FE 
    Tester Connection
    		Switch Condition
    		Specified Condition
    A18-8 (CANH) - A18-9 (CANL)
    		Ignition switch off
    		108 to 132 Ω
    for 1ND-TV 
    Tester Connection
    		Switch Condition
    		Specified Condition
    A19-3 (CANH) - A19-4 (CANL)
    		Ignition switch off
    		108 to 132 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to ECM)
    *2
    		for 1KR-FE and 1NR-FE
    *3
    		for 1ND-TV
    Result 
    Result
    		Proceed to
    NG
    		A
    OK (for 1KR-FE engine)
    		B
    OK (for 1NR-FE engine)
    		C
    OK (for 1ND-TV engine)
    		D



B
REPLACE ECM (Click here)

C
REPLACE ECM (Click here)

D
REPLACE ECM (Click here)
A


5.CONNECT CONNECTOR

  1. Reconnect the ECM connector.


NEXT


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

  1. Turn the ignition switch off.



    E175998E02

  1. Disconnect the A49 CAN No. 1 junction connector.

  1. Measure the resistance according to the value 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

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



NG
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN-H, CAN-L)
OK

REPLACE CAN NO. 1 JUNCTION CONNECTOR 

7.CONNECT CONNECTOR

  1. Reconnect the CAN No. 1 junction connector.


NEXT


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

  1. Turn the ignition switch off.



    E175991E01

  1. Disconnect the D1 combination meter assembly (combination meter ECU) connector.

  1. Measure the resistance according to the value in the table below.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D1-21 (CANH) - D1-20 (CANL)
    		Ignition switch off
    		108 to 132 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Combination Meter Assembly (Combination Meter ECU))



NG
Go to step 9
OK

REPLACE COMBINATION METER ASSEMBLY (Click here)  

9.CONNECT CONNECTOR

  1. Reconnect the combination meter assembly (combination meter ECU) connector.


NEXT


10.CHECK FOR OPEN IN CAN BUS MAIN WIRE (CAN NO. 2 J/C - COMBINATION METER ECU)

  1. Turn the ignition switch off.



    E175999E01

  1. Disconnect the D71 CAN No. 2 junction connector.

  1. Measure the resistance according to the value in the table below.

    Standard Resistance::
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-5 (CANH) - D71-16 (CANL)
    		Ignition switch off
    		108 to 132 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to CAN No. 2 junction connector)



NG
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN-H, CAN-L)
OK


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

  1. Turn the ignition switch off.



    E175999E02

  1. Measure the resistance according to the value in the table below.

    Standard Resistance::
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-1 (CANH) - D71-12 (CANL)
    		Ignition switch off
    		108 to 132 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to CAN No. 2 junction connector)



NG
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (CAN-H, CAN-L)
OK

REPLACE CAN NO. 2 JUNCTION CONNECTOR