Can Communication System (For Lhd With Entry And Start System) 4Wd Control Ecu Communication Stop Mode


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

CHECK FOR OPEN IN CAN BUS WIRE (FOUR WHEEL DRIVE CONTROL ECU CAN BRANCH WIRE)

CHECK HARNESS AND CONNECTOR (FOUR WHEEL DRIVE CONTROL ECU - BATTERY AND BODY GROUND)

CAN COMMUNICATION SYSTEM (for LHD with Entry and Start System) - 4WD Control ECU Communication Stop Mode


DESCRIPTION


Detection Item
Symptom
Trouble Area
4WD Control ECU Communication Stop Mode
Either condition is met:
  1. "Four Wheel Drive Control" is not displayed on the "Bus Check".
  2. "4WD Control ECU Communication Stop Mode" in "DTC Combination Table" applies.
  1. Power source circuit of four wheel drive control ECU
  2. Four wheel drive control ECU CAN branch wire or connector
  3. Four wheel drive control ECU

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System.Can Communication System (For Lhd With Entry And Start System) 4Wd Control Ecu Communication Stop Mode


INSPECTION PROCEDURE

NOTICE:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.
HINT:
Operating the engine 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 CAN main wire and the CAN branch wire.

    CAUTION:
    Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the airbag system.
    NOTICE:
    1. After turning the engine switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work (LandCruiser RM000003YMD00TX.html).
    2. When disconnecting the cable, some systems need to be initialized after the cable is reconnected (LandCruiser RM000003YMF011X.html).

NEXT


2.CHECK FOR OPEN IN CAN BUS WIRE (FOUR WHEEL DRIVE CONTROL ECU CAN BRANCH WIRE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System.Can Communication System (For Lhd With Entry And Start System) 4Wd Control Ecu Communication Stop Mode

  1. Disconnect the G53 four wheel drive control ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G53-19 (CANH) - G53-20 (CANL)
    		Engine switch off
    		54 to 69 Ω
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to Four Wheel Drive Control ECU)


NG
REPAIR OR REPLACE FOUR WHEEL DRIVE CONTROL ECU BRANCH WIRE OR CONNECTOR (CANH, CANL)
OK


3.CHECK HARNESS AND CONNECTOR (FOUR WHEEL DRIVE CONTROL ECU - BATTERY AND BODY GROUND)

  1. Connect the cable to the negative (-) battery terminal.

    NOTICE:
    When disconnecting the cable, some systems need to be initialized after the cable is reconnected (LandCruiser RM000003YMF011X.html).


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System.Can Communication System (For Lhd With Entry And Start System) 4Wd Control Ecu Communication Stop Mode

  1. Disconnect the G54 four wheel drive control ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G54-4 (GND) - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G54-3 (IG) - Body ground
    		Engine switch on (IG)
    		11 to 14 V
Text in Illustration
*a
Rear view of wire harness connector
(to Four Wheel Drive Control ECU)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE FOUR WHEEL DRIVE CONTROL ECU (LandCruiser RM00000479S00VX.html)