CAN COMMUNICATION SYSTEM > Check CAN Bus Lines for Short Circuit (w/o Stop and Start System)

for Preparation Click here


DESCRIPTION

There may a short circuit in the CAN main wire and/or CAN branch wire when the resistance between terminals 6 (CANH) and 14 (CANL) of the DLC3 is below 54 Ω.

Symptom
Trouble Area
Resistance between terminals 6 (CANH) and 14 (CANL) of DLC3 below 54 Ω
  1. Short in CAN bus wire
  2. ECM
  3. Combination meter assembly (Combination meter ECU)
  4. Steering column assembly (Power steering ECU)
  5. Brake actuator assembly (Skid control ECU)
  6. Spiral cable sub-assembly (Steering sensor)
  7. Yaw rate sensor
  8. Center airbag sensor assembly
  9. Air conditioning amplifier assembly
  10. Certification ECU*1
  11. Main body ECU
  12. Power management control ECU*1, *2
  13. Power source control ECU*1, *3
  14. CAN No. 1 junction connector
  15. CAN No. 2 junction connector
*1: w/ Entry and Start System
*2: for 1KR-FE and 1NR-FE
*3: for 1ND-TV

WIRING DIAGRAM


E175971E02


E176011E01


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 FOR SHORT IN CAN BUS WIRES (DLC3 BRANCH WIRE)

  1. Turn the ignition switch off.



    E175999E03

  1. Disconnect the D71 CAN No. 2 junction connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to CAN No. 2 junction connector)



    E175996E04

  1. Measure the resistance according to the value(s) in the table below.
    Text in Illustration 
    *2
    		Front view of DLC3

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D47-6 (CANH) - D47-14 (CANL)
    		Ignition switch off
    		1 MΩ or higher



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


2.CONNECT CONNECTOR

  1. Reconnect the CAN No. 2 junction connector.


NEXT


3.CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C)

  1. Turn the ignition switch off.



    E175998E03

  1. Disconnect the A49 CAN No. 1 junction connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to CAN No. 1 junction connector)



    E175996E04

  1. Measure the resistance according to the value in the table below.
    Text in Illustration 
    *2
    		Front view of DLC3

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



NG
Go to step 6
OK


4.CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - ECM)


    E175998E02

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

    HINT:
    The resistance must be measured after the A49 CAN No. 1 junction connector is disconnected.

    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
Go to step 18
OK


5.CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - SKID CONTROL ECU)


    E175998E04

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

    HINT:
    The resistance must be measured after the A49 CAN No. 1 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A49-7 (CANH) - A49-3 (CANL)
    		Ignition switch off
    		200 Ω or higher

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



NG
Go to step 19
OK

REPLACE CAN NO. 1 JUNCTION CONNECTOR 

6.CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 1 J/C - CAN NO. 2 J/C)

  1. Turn the ignition switch off.



    E175999E02

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

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

    HINT:
    The resistance must be measured after the A49 CAN No. 1 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-1 (CANH) - D71-12 (CANL)
    		Ignition switch off
    		1 MΩ or higher

    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


7.CONNECT CONNECTOR

  1. Reconnect the CAN No. 1 junction connector.


NEXT


8.CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - COMBINATION METER ECU)


    E175999E01

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

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    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
Go to step 20
OK


9.SYSTEM CHECK

  1. Check the vehicle specifications.
    Result 
    Result
    		Proceed to
    w/ Entry and Start System
    		A
    w/o Entry and Start System
    		B



B
Go to step 12
A


10.CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - POWER MANAGEMENT ECU OR POWER SOURCE ECU)


    E175999E04

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

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-10 (CANH) - D71-21 (CANL)
    		Ignition switch off
    		200 Ω or higher

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



NG
Go to step 21
OK


11.CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - CERTIFICATION ECU)


    E175999E05

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

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-11 (CANH) - D71-22 (CANL)
    		Ignition switch off
    		200 Ω or higher

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



NG
Go to step 24
OK


12.CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    E175999E06

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

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-6 (CANH) - D71-17 (CANL)
    		Ignition switch off
    		200 Ω or higher

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



NG
Go to step 25
OK


13.CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - MAIN BODY ECU)


    E175999E07

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

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-2 (CANH) - D71-13 (CANL)
    		Ignition switch off
    		200 Ω or higher

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



NG
Go to step 26
OK


14.CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - STEERING SENSOR)


    E175999E08

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

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-3 (CANH) - D71-14 (CANL)
    		Ignition switch off
    		200 Ω or higher

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



NG
Go to step 27
OK


15.CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - CENTER AIRBAG SENOR ASSEMBLY)


    E175999E09

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

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-7 (CANH) - D71-18 (CANL)
    		Ignition switch off
    		200 Ω or higher

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



NG
Go to step 28
OK


16.CHECK FOR SHORT IN CAN BUS WIRES (CAN NO.2 J/C - YAW RATE SENSOR)


    E175999E10

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

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-8 (CANH) - D71-19 (CANL)
    		Ignition switch off
    		200 Ω or higher

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



NG
Go to step 29
OK


17.CHECK FOR SHORT IN CAN BUS WIRES (CAN NO. 2 J/C - POWER STEERING ECU)


    E175999E11

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

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-9 (CANH) - D71-20 (CANL)
    		Ignition switch off
    		200 Ω or higher

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



NG
Go to step 30
OK

REPLACE CAN NO. 2 JUNCTION CONNECTOR 

18.CHECK FOR SHORT IN CAN BUS WIRES (ECM)
E176012E01

  1. Disconnect the A18 or A19 ECM connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to ECM)
    *2
    		for 1KR-FE and 1NR-FE
    *3
    		for 1ND-TV



    E175998E07

  1. Measure the resistance according to the value(s) in the table below.
    Text in Illustration 
    *4
    		Front view of wire harness connector
    (to CAN No. 1 junction connector)

    HINT:
    The resistance must be measured after the A49 CAN No. 1 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A49-6 (CANH) - A49-4 (CANL)
    		Ignition switch off
    		1 MΩ or higher

    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

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

19.CHECK FOR SHORT IN CAN BUS WIRES (SKID CONTROL ECU)


    E175972E10

  1. Disconnect the A16 or A17 brake actuator assembly (skid control ECU) connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Brake Actuator Assembly (Skid Control ECU))
    *2
    		for LHD
    *3
    		for RHD



    E175998E08

  1. Measure the resistance according to the value(s) in the table below.
    Text in Illustration 
    *4
    		Front view of wire harness connector
    (to CAN No. 1 junction connector)

    HINT:
    The resistance must be measured after the A49 CAN No. 1 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A49-7 (CANH) - A49-3 (CANL)
    		Ignition switch off
    		1 MΩ or higher



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

REPLACE BRAKE ACTUATOR ASSEMBLY (Click here)  

20.CHECK FOR SHORT IN CAN BUS WIRES (COMBINATION METER ECU)


    E175991E03

  1. Disconnect the D1 combination meter assembly (combination meter ECU) connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Combination Meter Assembly (Combination Meter ECU))



    E175999E12

  1. Measure the resistance according to the value(s) in the table below.
    Text in Illustration 
    *2
    		Front view of wire harness connector
    (to CAN No. 2 junction connector)

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-5 (CANH) - D71-16 (CANL)
    		Ignition switch off
    		1 MΩ or higher



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

REPLACE COMBINATION METER ASSEMBLY (Click here)  

21.SYSTEM CHECK

  1. Check the vehicle specifications.
    Result 
    Result
    		Proceed to
    for 1KR-FE engine and 1NR-FE engine
    		A
    for 1ND-TV engine
    		B



B
Go to step 23
A


22.CHECK FOR SHORT IN CAN BUS WIRES (POWER MANAGEMENT CONTROL ECU)


    E175990E07

  1. Disconnect the D38 power management control ECU connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Power Management Control ECU)



    E175999E13

  1. Measure the resistance according to the value(s) in the table below.
    Text in Illustration 
    *2
    		Front view of wire harness connector
    (to CAN No. 2 junction connector)

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-10 (CANH) - D71-21 (CANL)
    		Ignition switch off
    		1 MΩ or higher



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

REPLACE POWER MANAGEMENT CONTROL ECU (Click here)  

23.CHECK FOR SHORT IN CAN BUS WIRES (POWER SOURCE CONTROL ECU)


    E175990E08

  1. Disconnect the D73 power source control ECU connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Power Source Control ECU)



    E175999E13

  1. Measure the resistance according to the value(s) in the table below.
    Text in Illustration 
    *2
    		Front view of wire harness connector
    (to CAN No. 2 junction connector)

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-10 (CANH) - D71-21 (CANL)
    		Ignition switch off
    		1 MΩ or higher



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

REPLACE POWER SOURCE CONTROL ECU (Click here)  

24.CHECK FOR SHORT IN CAN BUS WIRES (CERTIFICATION ECU)


    E175994E03

  1. Disconnect the D34 certification ECU connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Certification ECU)



    E175999E14

  1. Measure the resistance according to the value(s) in the table below.
    Text in Illustration 
    *2
    		Front view of wire harness connector
    (to CAN No. 2 junction connector)

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-11 (CANH) - D71-22 (CANL)
    		Ignition switch off
    		1 MΩ or higher



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

REPLACE CERTIFICATION ECU 

25.CHECK FOR SHORT IN CAN BUS WIRES (AIR CONDITIONING AMPLIFIER ASSEMBLY)


    E176001E01

  1. Disconnect the D15 or D16 air conditioning amplifier assembly connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Air Conditioning Amplifier Assembly)
    *2
    		for Manual Air Conditioning System
    *3
    		for Automatic Air Conditioning System



    E175999E21

  1. Measure the resistance according to the value(s) in the table below.
    Text in Illustration 
    *4
    		Front view of wire harness connector
    (to CAN No. 2 junction connector)

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-6 (CANH) - D71-17 (CANL)
    		Ignition switch off
    		1 MΩ or higher



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

REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY (Click here)  

26.CHECK FOR SHORT IN CAN BUS WIRES (MAIN BODY ECU)


    E175990E09

  1. Disconnect the D42 main body ECU connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Main Body ECU)



    E175999E16

  1. Measure the resistance according to the value(s) in the table below.
    Text in Illustration 
    *2
    		Front view of wire harness connector
    (to CAN No. 2 junction connector)

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-2 (CANH) - D71-13 (CANL)
    		Ignition switch off
    		1 MΩ or higher



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

REPLACE MAIN BODY ECU (Click here)  

27.CHECK FOR SHORT IN CAN BUS WIRES (STEERING SENSOR)


    E175981E03

  1. Disconnect the D20 spiral cable sub-assembly (steering sensor) connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Spiral Cable Sub-Assembly (Steering Sensor))



    E175999E17

  1. Measure the resistance according to the value(s) in the table below.
    Text in Illustration 
    *2
    		Front view of wire harness connector
    (to CAN No. 2 junction connector)

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-3 (CANH) - D71-14 (CANL)
    		Ignition switch off
    		1 MΩ or higher



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

REPLACE SPIRAL CABLE SUB-ASSEMBLY (Click here)  

28.CHECK FOR SHORT IN CAN BUS WIRES (CENTER AIRBAG SENSOR ASSEMBLY)


    E175992E03

  1. Disconnect the D43 center airbag sensor assembly connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Center Airbag Sensor Assembly)



    E175999E18

  1. Measure the resistance according to the value(s) in the table below.
    Text in Illustration 
    *2
    		Front view of wire harness connector
    (to CAN No. 2 junction connector)

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-7 (CANH) - D71-18 (CANL)
    		Ignition switch off
    		1 MΩ or higher



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

REPLACE CENTER AIRBAG SENSOR ASSEMBLY (Click here)  

29.CHECK FOR SHORT IN CAN BUS WIRES (YAW RATE SENSOR)


    E175983E03

  1. Disconnect the D58 yaw rate sensor connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Yaw Rate Sensor)



    E175999E19

  1. Measure the resistance according to the value(s) in the table below.
    Text in Illustration 
    *2
    		Front view of wire harness connector
    (to CAN No. 2 junction connector)

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-8 (CANH) - D71-19 (CANL)
    		Ignition switch off
    		1 MΩ or higher



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

REPLACE YAW RATE SENSOR (Click here)  

30.CHECK FOR SHORT IN CAN BUS WIRES (POWER STEERING ECU)


    E175978E02

  1. Disconnect the D51 steering column assembly (power steering ECU) connector.
    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Steering Column Assembly (Power Steering ECU))



    E175999E20

  1. Measure the resistance according to the value(s) in the table below.
    Text in Illustration 
    *2
    		Front view of wire harness connector
    (to CAN No. 2 junction connector)

    HINT:
    The resistance must be measured after the D71 CAN No. 2 junction connector is disconnected.

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D71-9 (CANH) - D71-20 (CANL)
    		Ignition switch off
    		1 MΩ or higher



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

REPLACE STEERING COLUMN ASSEMBLY (Click here)