Can Communication System (W/ Vsc) Check Can Bus Line For Short To Gnd


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

CHECK FOR SHORT TO GND IN CAN BUS WIRE (DLC3 BRANCH WIRE)

CONNECT CONNECTOR

CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR SIDE)

CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - SKID CONTROL ECU)

CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - ECM)

CHECK FOR SHORT TO GND IN CAN BUS WIRE (SKID CONTROL ECU)

CHECK FOR SHORT TO GND IN CAN BUS WIRE (ECM)

CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

CONNECT CONNECTOR

CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR SIDE)

CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - YAW RATE SENSOR)

CHECK FOR SHORT TO GND IN CAN BUS WIRE (YAW RATE SENSOR)

CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

CONNECT CONNECTOR

CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - STEERING ANGLE SENSOR)

CHECK FOR SHORT TO GND IN CAN BUS WIRE (STEERING ANGLE SENSOR)

CAN COMMUNICATION SYSTEM (w/ VSC) - Check CAN Bus Line for Short to GND


DESCRIPTION

There may be a short circuit between the CAN bus line and GND when the resistance between terminals 6 (CANH) and 4 (CG) or terminals 14 (CANL) and 4 (CG) of the DLC3 is below 1 Ω.

Symptom
Trouble Area
The resistance between terminals 6 (CANH) and 4 (CG) or terminals 14 (CANL) and 4 (CG) of the DLC3 is below 1 Ω.
  1. Short to GND
  2. Brake actuator assembly (skid control ECU)
  3. Spiral cable (steering angle sensor)
  4. Yaw rate sensor
  5. ECM
  6. No. 1 junction connector
  7. No. 2 junction connector
  8. No. 3 junction connector

WIRING DIAGRAM


Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Can Communication.Can Communication System (W/ Vsc).Can Communication System (W/ Vsc) Check Can Bus Line For Short To Gnd


INSPECTION PROCEDURE

HINT:
Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.
1.DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

  1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the main wire and the branch wire.

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the SRS system.
    NOTICE:
    When disconnecting the cable from the negative (-) battery terminal, some systems need to be initialized after the cable is reconnected (Toyota Fortuner RM000002HD2002X.html).

NEXT


2.CHECK FOR SHORT TO GND IN CAN BUS WIRE (DLC3 BRANCH WIRE)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Can Communication.Can Communication System (W/ Vsc).Can Communication System (W/ Vsc) Check Can Bus Line For Short To Gnd

  1. Disconnect the J51 No. 3 junction connector connector.

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

    Result
    Tester Connection
    		Switch Condition
    		Measured Resistance
    		Proceed to
    D3-6 (CANH) - D3-4 (CG)
    		Ignition switch off
    		1 Ω or higher
    		OK
    D3-14 (CANL) - D3-4 (CG)
    D3-6 (CANH) - D3-4 (CG)
    		Ignition switch off
    		Below 1 Ω
    		NG
    D3-14 (CANL) - D3-4 (CG)


NG
REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO DLC3 (CANH, CANL)
OK


3.CONNECT CONNECTOR

  1. Reconnect the J51 No. 3 junction connector connector.


NEXT


4.CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR SIDE)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Can Communication.Can Communication System (W/ Vsc).Can Communication System (W/ Vsc) Check Can Bus Line For Short To Gnd

  1. Disconnect the J57 No. 1 junction connector connector.

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

    Result
    Tester Connection
    		Switch Condition
    		Measured Resistance
    		Result
    D3-6 (CANH) - D3-4 (CG)
    		Ignition switch off
    		1 Ω or higher
    		OK
    D3-14 (CANL) - D3-4 (CG)
    D3-6 (CANH) - D3-4 (CG)
    		Ignition switch off
    		Below 1 Ω
    		NG
    D3-14 (CANL) - D3-4 (CG)


NG
Go to step 9
OK


5.CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - SKID CONTROL ECU)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Can Communication.Can Communication System (W/ Vsc).Can Communication System (W/ Vsc) Check Can Bus Line For Short To Gnd

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

    Result
    Tester Connection
    		Switch Condition
    		Measured Resistance
    		Proceed to
    J57-13 (CANH) - D3-4 (CG)
    		Ignition switch off
    		1 Ω or higher
    		OK
    J57-7 (CANL) - D3-4 (CG)
    J57-13 (CANH) - D3-4 (CG)
    		Ignition switch off
    		Below 1 Ω
    		NG
    J57-7 (CANL) - D3-4 (CG)


NG
Go to step 7
OK


6.CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - ECM)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Can Communication.Can Communication System (W/ Vsc).Can Communication System (W/ Vsc) Check Can Bus Line For Short To Gnd

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

    Result
    Tester Connection
    		Switch Condition
    		Measured Resistance
    		Proceed to
    J57-12 (CANH) - D3-4 (CG)
    		Ignition switch off
    		1 Ω or higher
    		OK
    J57-6 (CANL) - D3-4 (CG)
    J57-12 (CANH) - D3-4 (CG)
    		Ignition switch off
    		Below 1 Ω
    		NG
    J57-6 (CANL) - D3-4 (CG)


NG
Go to step 8
OK

REPAIR OR REPLACE NO. 1 JUNCTION CONNECTOR

7.CHECK FOR SHORT TO GND IN CAN BUS WIRE (SKID CONTROL ECU)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Can Communication.Can Communication System (W/ Vsc).Can Communication System (W/ Vsc) Check Can Bus Line For Short To Gnd

  1. Disconnect the S25 skid control ECU connector.

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

    Result
    Tester Connection
    		Switch Condition
    		Measured Resistance
    		Proceed to
    J57-13 (CANH) - D3-4 (CG)
    		Ignition switch off
    		1 Ω or higher
    		OK
    J57-7 (CANL) - D3-4 (CG)
    J57-13 (CANH) - D3-4 (CG)
    		Ignition switch off
    		Below 1 Ω
    		NG
    J57-7 (CANL) - D3-4 (CG)


NG
REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO SKID CONTROL ECU (CANH, CANL)
OK

REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) (Toyota Fortuner RM0000010K000DX.html)

8.CHECK FOR SHORT TO GND IN CAN BUS WIRE (ECM)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Can Communication.Can Communication System (W/ Vsc).Can Communication System (W/ Vsc) Check Can Bus Line For Short To Gnd

  1. Disconnect the E5 ECM connector.

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

    Result
    Tester Connection
    		Switch Condition
    		Measured Resistance
    		Proceed to
    J57-12 (CANH) - D3-4 (CG)
    		Ignition switch off
    		1 Ω or higher
    		OK
    J57-6 (CANL) - D3-4 (CG)
    J57-12 (CANH) - D3-4 (CG)
    		Ignition switch off
    		Below 1 Ω
    		NG
    J57-6 (CANL) - D3-4 (CG)


NG
REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO ECM (CANH, CANL)
OK

REPLACE ECM (Toyota Fortuner RM0000013Z0004X.html)

9.CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Can Communication.Can Communication System (W/ Vsc).Can Communication System (W/ Vsc) Check Can Bus Line For Short To Gnd

  1. Disconnect the J56 No. 2 junction connector connector.

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

    Result
    Tester Connection
    		Switch Condition
    		Measured Resistance
    		Proceed to
    J56-1 (CANH) - D3-4 (CG)
    		Ignition switch off
    		1 Ω or higher
    		OK
    J56-2 (CANL) - D3-4 (CG)
    J56-1 (CANH) - D3-4 (CG)
    		Ignition switch off
    		Below 1 Ω
    		NG
    J56-2 (CANL) - D3-4 (CG)


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


10.CONNECT CONNECTOR

  1. Reconnect the J57 No. 1 junction connector connector.


NEXT


11.CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR SIDE)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Can Communication.Can Communication System (W/ Vsc).Can Communication System (W/ Vsc) Check Can Bus Line For Short To Gnd

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

    Result
    Tester Connection
    		Switch Condition
    		Measured Resistance
    		Proceed to
    D3-6 (CANH) - D3-4 (CG)
    		Ignition switch off
    		1 Ω or higher
    		OK
    D3-14 (CANL) - D3-4 (CG)
    D3-6 (CANH) - D3-4 (CG)
    		Ignition switch off
    		Below 1 Ω
    		NG
    D3-14 (CANL) - D3-4 (CG)


NG
Go to step 14
OK


12.CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - YAW RATE SENSOR)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Can Communication.Can Communication System (W/ Vsc).Can Communication System (W/ Vsc) Check Can Bus Line For Short To Gnd

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

    Result
    Tester Connection
    		Switch Condition
    		Measured Resistance
    		Proceed to
    J56-4 (CANH) - D3-4 (CG)
    		Ignition switch off
    		1 Ω or higher
    		OK
    J56-6 (CANL) - D3-4 (CG)
    J56-4 (CANH) - D3-4 (CG)
    		Ignition switch off
    		Below 1 Ω
    		NG
    J56-6 (CANL) - D3-4 (CG)


NG
Go to step 13
OK

REPAIR OR REPLACE NO. 2 JUNCTION CONNECTOR

13.CHECK FOR SHORT TO GND IN CAN BUS WIRE (YAW RATE SENSOR)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Can Communication.Can Communication System (W/ Vsc).Can Communication System (W/ Vsc) Check Can Bus Line For Short To Gnd

  1. Disconnect the Y1 yaw rate sensor connector.

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

    Result
    Tester Connection
    		Switch Condition
    		Measured Resistance
    		Proceed to
    J56-4 (CANH) - D3-4 (CG)
    		Ignition switch off
    		1 Ω or higher
    		OK
    J56-6 (CANL) - D3-4 (CG)
    J56-4 (CANH) - D3-4 (CG)
    		Ignition switch off
    		Below 1 Ω
    		NG
    J56-6 (CANL) - D3-4 (CG)


NG
REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO YAW RATE SENSOR (CANH, CANL)
OK

REPLACE YAW RATE SENSOR (Toyota Fortuner RM000000SS501SX.html)

14.CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Can Communication.Can Communication System (W/ Vsc).Can Communication System (W/ Vsc) Check Can Bus Line For Short To Gnd

  1. Disconnect the J52 No. 3 junction connector connector.

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

    Result
    Tester Connection
    		Switch Condition
    		Measured Resistance
    		Proceed to
    J52-2 (CANH) - D3-4 (CG)
    		Ignition switch off
    		1 Ω or higher
    		OK
    J52-1 (CANL) - D3-4 (CG)
    J52-2 (CANH) - D3-4 (CG)
    		Ignition switch off
    		Below 1 Ω
    		NG
    J52-1 (CANL) - D3-4 (CG)


NG
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)
OK


15.CONNECT CONNECTOR

  1. Reconnect the J56 No. 2 junction connector connector.

  1. Reconnect the J52 No. 3 junction connector connector.


NEXT


16.CHECK FOR SHORT TO GND IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - STEERING ANGLE SENSOR)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Can Communication.Can Communication System (W/ Vsc).Can Communication System (W/ Vsc) Check Can Bus Line For Short To Gnd

  1. Disconnect the J53 No. 3 junction connector connector.

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

    Result
    Tester Connection
    		Switch Condition
    		Measured Resistance
    		Proceed to
    J53-2 (CANH) - D3-4 (CG)
    		Ignition switch off
    		1 Ω or higher
    		OK
    J53-1 (CANL) - D3-4 (CG)
    J53-2 (CANH) - D3-4 (CG)
    		Ignition switch off
    		Below 1 Ω
    		NG
    J53-1 (CANL) - D3-4 (CG)


NG
Go to step 17
OK

REPAIR OR REPLACE NO. 3 JUNCTION CONNECTOR

17.CHECK FOR SHORT TO GND IN CAN BUS WIRE (STEERING ANGLE SENSOR)


    Toyota Fortuner. Ggn50, 60 Kun51, 61 Tgn51 Lan50.Can Communication.Can Communication System (W/ Vsc).Can Communication System (W/ Vsc) Check Can Bus Line For Short To Gnd

  1. Disconnect the S23 steering angle sensor connector.

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

    Result
    Tester Connection
    		Switch Condition
    		Measured Resistance
    		Proceed to
    J53-2 (CANH) - D3-4 (CG)
    		Ignition switch off
    		1 Ω or higher
    		OK
    J53-1 (CANL) - D3-4 (CG)
    J53-2 (CANH) - D3-4 (CG)
    		Ignition switch off
    		Below 1 Ω
    		NG
    J53-1 (CANL) - D3-4 (CG)


NG
REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO STEERING ANGLE SENSOR (CANH, CANL)
OK

REPLACE SPIRAL CABLE (STEERING ANGLE SENSOR) (Toyota Fortuner RM000000SS902HX.html)