Dtc U1002 Lost Communication With Gateway Module


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL

CHECK CAN BUS WIRE (CHECK CAN MAIN WIRE FOR DISCONNECTION, CHECK BUS LINE FOR SHORT)

CHECK FOR OPEN IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - NETWORK GATEWAY ECU)

CHECK FOR OPEN IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)

CONNECT CONNECTOR

CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - NETWORK GATEWAY ECU)

CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

CONNECT CONNECTOR

CHECK FOR OPEN IN CAN BUS WIRE (NETWORK GATEWAY ECU)

CONNECT CONNECTOR

CHECK FOR OPEN IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)

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

CONNECT CONNECTOR

CHECK FOR OPEN IN CAN BUS WIRE (NO. 5 JUNCTION CONNECTOR)

CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR SIDE)

CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)

CONNECT CONNECTOR

CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 JUNCTION CONNECTOR)

CONNECT CONNECTOR

CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)

CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR SIDE)

CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - CLEARANCE WARNING ECU ASSEMBLY)

CONNECT CONNECTOR

CHECK FOR SHORT IN CAN BUS WIRES (CLEARANCE WARNING ECU ASSEMBLY)

CONNECT CONNECTOR

CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)

CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - NETWORK GATEWAY ECU)

CONNECT CONNECTOR

CHECK FOR SHORT IN CAN BUS WIRES (NETWORK GATEWAY ECU)

CHECK HARNESS AND CONNECTOR (NETWORK GATEWAY ECU - BATTERY AND BODY GROUND)

DTC U1002 Lost Communication with Gateway Module


DESCRIPTION

  1. The network gateway ECU stores this DTC when no signals can be received from the ECUs that have been memorized as those connected to the CAN V2 bus.
  2. When the network gateway ECU receives a response signal from the ECUs connected to the CAN V2 bus, the network gateway ECU recognizes and memorizes that the ECU is connected to the CAN V2 bus. Based on this memorized data, the network gateway ECU monitors for malfunctions in the ECUs connected to the CAN V2 bus when communicating with those ECUs. If the network gateway ECU cannot receive response signals from the ECUs that have been memorized as those connected to the CAN V2 bus, the network gateway ECU determines that a malfunction exists.
  3. If 2 or more DTCs are output during the DTC check, one side of the CAN branch wire may be open (one side of the CANH [CAN branch wire]/CANL [CAN branch wire] of the ECU and/or sensor is open).

DTC Code
DTC Detection Condition
Trouble Area
U1002
Lost communication with the gateway module.
  1. V2 bus circuit
  2. Network gateway ECU CAN main wire or connector
  3. Clearance warning ECU assembly CAN branch wire or connector
  4. Network gateway ECU
  5. Clearance warning ECU assembly
  6. No. 1 junction connector
  7. No. 2 junction connector
  8. No. 3 junction connector
  9. No. 5 junction connector
  1. For vehicles with a TOYOTA parking assist-sensor system (for 4 sensor type).

WIRING DIAGRAM


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module


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 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 ignition 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 CAN BUS WIRE (CHECK CAN MAIN WIRE FOR DISCONNECTION, CHECK BUS LINE FOR SHORT)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    		Resistance: Malfunction
    G155-13 (CA2H) - G155-12 (CA2L)
    		Ignition switch off
    		54 to 69 Ω
    		Below 53 Ω: Short in line
    G155-13 (CA2H) - G155-12 (CA2L)
    		Ignition switch off
    		54 to 69 Ω
    		Higher than 70 Ω: Open in CAN main bus line
    G155-13 (CA2H) - G155-2 (BATT)
    		Ignition switch off
    		6 kΩ or higher
    		Below 6 kΩ: +B short
    G155-12 (CA2L) - G155-2 (BATT)
    		Ignition switch off
    		6 kΩ or higher
    		Below 6 kΩ: +B short
    G155-13 (CA2H) - G155-4 (GND)
    		Ignition switch off
    		200 Ω or higher
    		Below 200 Ω: Ground short
    G155-12 (CA2L) - G155-4 (GND)
    		Ignition switch off
    		200 Ω or higher
    		Below 200 Ω: Ground short
    Text in Illustration
    *a
    		Component with harness connected
    (Network Gateway ECU)
    Result
    Result
    		Proceed to
    NG
    1. Open in CAN main bus line
    		A
    NG
    1. Short in line
    2. +B short
    3. GND short
    		B
    OK
    		C


B
Go to step 15

C
Go to step 30
A


3.CHECK FOR OPEN IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - NETWORK GATEWAY ECU)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

  1. Disconnect the G95 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
    G95-1 (CANH) - G95-12 (CANL)
    		Ignition switch off
    		108 to 132 Ω
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to No. 2 Junction Connector)


NG
Go to step 5
OK


4.CHECK FOR OPEN IN CAN BUS WIRE (NO. 2 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G95-3 (CANH) - G95-14 (CANL)
    		Ignition switch off
    		108 to 132 Ω
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to No. 2 Junction Connector)


NG
Go to step 10
OK

REPLACE NO. 2 JUNCTION CONNECTOR

5.CONNECT CONNECTOR

  1. Reconnect the G95 No. 2 junction connector.


NEXT


6.CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - NETWORK GATEWAY ECU)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

  1. Disconnect the G98 No. 3 junction connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G98-1 (CANH) - G98-12 (CANL)
    		Ignition switch off
    		108 to 132 Ω
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to No. 3 Junction Connector)


NG
Go to step 8
OK


7.CHECK FOR OPEN IN CAN BUS WIRE (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G98-3 (CANH) - G98-14 (CANL)
    		Ignition switch off
    		108 to 132 Ω
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to No. 3 Junction Connector)


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

REPLACE NO. 3 JUNCTION CONNECTOR

8.CONNECT CONNECTOR

  1. Reconnect the G98 No. 3 junction connector.


NEXT


9.CHECK FOR OPEN IN CAN BUS WIRE (NETWORK GATEWAY ECU)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

  1. Disconnect the G155 network gateway ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G155-13 (CA2H) - G155- 12 (CA2L)
    		Ignition switch off
    		108 to 132 Ω
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to Network Gateway ECU)


NG
REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO NETWORK GATEWAY ECU (NETWORK GATEWAY ECU - NO. 3 JUNCTION CONNECTOR)
OK

REPLACE NETWORK GATEWAY ECU (LandCruiser RM0000039R5027X.html)

10.CONNECT CONNECTOR

  1. Reconnect the G95 No. 2 junction connector.


NEXT


11.CHECK FOR OPEN IN CAN BUS WIRE (NO. 1 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

  1. Disconnect the A72 No. 1 junction connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A72-1 (CANH) - A72-12 (CANL)
    		Ignition switch off
    		108 to 132 Ω
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to No. 1 Junction Connector)


NG
Go to step 13
OK


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


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A72-2 (CANH) - A72-13 (CANL)
    		Ignition switch off
    		108 to 132 Ω
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to No. 1 Junction Connector)


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

REPLACE NO. 1 JUNCTION CONNECTOR

13.CONNECT CONNECTOR

  1. Reconnect the A72 No. 1 junction connector.


NEXT


14.CHECK FOR OPEN IN CAN BUS WIRE (NO. 5 JUNCTION CONNECTOR)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

  1. Disconnect the G102 No. 5 junction connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G102-3 (CANH) - G102-2 (CANL)
    		Ignition switch off
    		108 to 132 Ω
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to No. 5 Junction Connector)


NG
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 5 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)
OK

REPLACE NO. 5 JUNCTION CONNECTOR

15.CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR SIDE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

  1. Disconnect the A72 No. 1 junction connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G155-13 (CA2H) - G155-12 (CA2L)
    		Ignition switch off
    		108 to 132 Ω
    G155-13 (CA2H) - G155-4 (GND)
    		Ignition switch off
    		200 Ω or higher
    G155-12 (CA2L) - G155-4 (GND)
    		Ignition switch off
    		200 Ω or higher
    G155-13 (CA2H) - G155-2 (BATT)
    		Ignition switch off
    		6 kΩ or higher
    G155-12 (CA2L) - G155-2 (BATT)
    		Ignition switch off
    		6 kΩ or higher
    Text in Illustration
    *a
    		Component with harness connected
    (Network Gateway ECU)


NG
Go to step 19
OK


16.CHECK FOR SHORT IN CAN BUS WIRES (NO. 1 JUNCTION CONNECTOR - NO. 5 JUNCTION CONNECTOR)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A72-1 (CANH) - A72-12 (CANL)
    		Ignition switch off
    		108 to 132 Ω
    A72-1 (CANH) - G48-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    A72-12 (CANL) - G48-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    A72-1 (CANH) - G48-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    A72-12 (CANL) - G48-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to No. 1 Junction Connector)
    *b
    		Front view of DLC3


NG
Go to step 17
OK

REPLACE NO. 1 JUNCTION CONNECTOR

17.CONNECT CONNECTOR

  1. Reconnect the A72 No. 1 junction connector.


NEXT


18.CHECK FOR SHORT IN CAN BUS WIRES (NO. 5 JUNCTION CONNECTOR)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

  1. Disconnect the G102 No. 5 junction connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G102-3 (CANH) - G102-2 (CANL)
    		Ignition switch off
    		108 to 132 Ω
    G102-3 (CANH) - G48-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    G102-2 (CANL) - G48-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    G102-3 (CANH) - G48-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    G102-2 (CANL) - G48-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to No. 5 Junction Connector)
    *b
    		Front view of DLC3


NG
REPAIR OR REPLACE CAN MAIN WIRE OR CONNECTOR (NO. 5 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)
OK

REPLACE NO. 5 JUNCTION CONNECTOR

19.CONNECT CONNECTOR

  1. Reconnect the A72 No. 1 junction connector.


NEXT


20.CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - NO. 1 JUNCTION CONNECTOR)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

  1. Disconnect the G95 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
    G95-3 (CANH) - G95-14 (CANL)
    		Ignition switch off
    		108 to 132 Ω
    G95-3 (CANH) - G48-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    G95-14 (CANL) - G48-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    G95-3 (CANH) - G48-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    G95-14 (CANL) - G48-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to No. 2 Junction Connector)
    *b
    		Front view of DLC3


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


21.CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR SIDE)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G155-13 (CA2H) - G155-12 (CA2L)
    		Ignition switch off
    		108 to 132 Ω
    G155-13 (CA2H) - G155-4 (GND)
    		Ignition switch off
    		200 Ω or higher
    G155-12 (CA2L) - G155-4 (GND)
    		Ignition switch off
    		200 Ω or higher
    G155-13 (CA2H) - G155-2 (BATT)
    		Ignition switch off
    		6 kΩ or higher
    G155-12 (CA2L) - G155-2 (BATT)
    		Ignition switch off
    		6 kΩ or higher
    Text in Illustration
    *a
    		Component with harness connected
    (Network Gateway ECU)


NG
Go to step 25
OK


22.CHECK FOR SHORT IN CAN BUS WIRES (NO. 2 JUNCTION CONNECTOR - CLEARANCE WARNING ECU ASSEMBLY)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G95-2 (CANH) - G95-13 (CANL)
    		Ignition switch off
    		200 Ω or higher
    G95-2 (CANH) - G48-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    G95-13 (CANL) - G48-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    G95-2 (CANH) - G48-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    G95-13 (CANL) - G48-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to No. 2 Junction Connector)
    *b
    		Front view of DLC3


NG
Go to step 23
OK

REPLACE NO. 2 JUNCTION CONNECTOR

23.CONNECT CONNECTOR

  1. Reconnect the G95 No. 2 junction connector.


NEXT


24.CHECK FOR SHORT IN CAN BUS WIRES (CLEARANCE WARNING ECU ASSEMBLY)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

  1. Disconnect the I1 clearance warning ECU assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    I1-3 (R1) - I1-5 (R2)
    		Ignition switch off
    		54 to 69 Ω
    I1-3 (R1) - G48-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    I1-5 (R2) - G48-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    I1-3 (R1) - G48-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    I1-5 (R2) - G48-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Clearance Warning ECU Assembly)
    *b
    		Front view of DLC3


NG
REPAIR OR REPLACE CAN BRANCH WIRE CONNECTED TO CLEARANCE WARNING ECU ASSEMBLY (R1, R2)
OK

REPLACE CLEARANCE WARNING ECU ASSEMBLY (LandCruiser RM00000470500NX.html)

25.CONNECT CONNECTOR

  1. Reconnect the G95 No. 2 junction connector.


NEXT


26.CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - NO. 2 JUNCTION CONNECTOR)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

  1. Disconnect the G98 No. 3 junction connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G98-3 (CANH) - G98-14 (CANL)
    		Ignition switch off
    		108 to 132 Ω
    G98-3 (CANH) - G48-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    G98-14 (CANL) - G48-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    G98-3 (CANH) - G48-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    G98-14 (CANL) - G48-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to No. 3 Junction Connector)
    *b
    		Front view of DLC3


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


27.CHECK FOR SHORT IN CAN BUS WIRES (NO. 3 JUNCTION CONNECTOR - NETWORK GATEWAY ECU)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G98-1 (CANH) - G98-12 (CANL)
    		Ignition switch off
    		108 to 132 Ω
    G98-1 (CANH) - G48-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    G98-12 (CANL) - G48-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    G98-1 (CANH) - G48-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    G98-12 (CANL) - G48-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to No. 3 Junction Connector)
    *b
    		Front view of DLC3


NG
Go to step 28
OK

REPLACE NO. 3 JUNCTION CONNECTOR

28.CONNECT CONNECTOR

  1. Reconnect the G98 No. 3 junction connector.


NEXT


29.CHECK FOR SHORT IN CAN BUS WIRES (NETWORK GATEWAY ECU)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

  1. Disconnect the G155 network gateway ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Switch Condition
    		Specified Condition
    G155-13 (CA2H) - G155-12 (CA2L)
    		Ignition switch off
    		108 to 132 Ω
    G155-13 (CA2H) - G48-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    G155-12 (CA2L) - G48-4 (CG)
    		Ignition switch off
    		200 Ω or higher
    G155-13 (CA2H) - G48-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    G155-12 (CA2L) - G48-16 (BAT)
    		Ignition switch off
    		6 kΩ or higher
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to Network Gateway ECU)
    *b
    		Front view of DLC3


NG
REPAIR OR REPLACE CAN MAIN WIRE CONNECTED TO NETWORK GATEWAY ECU (CA2H, CA2L)
OK

REPLACE NETWORK GATEWAY ECU (LandCruiser RM0000039R5027X.html)

30.CHECK HARNESS AND CONNECTOR (NETWORK GATEWAY ECU - BATTERY AND BODY GROUND)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Networking.Lin Communication System. Dtc U1002 Lost Communication With Gateway Module

  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).

  1. Disconnect the G155 network gateway ECU connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    G155-4 (GND) - Body ground
    		Always
    		Below 1 Ω

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    G155-2 (BATT) - Body ground
    		Always
    		11 to 14 V
    G155-10 (IG1) - Body ground
    		Ignition switch ON
    		11 to 14 V
    G155-9 (IG2) - Body ground
    		Ignition switch ON
    		11 to 14 V
Text in Illustration
*a
Rear view of wire harness connector
(to Network Gateway ECU)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE NETWORK GATEWAY ECU (LandCruiser RM0000039R5027X.html)