CAN COMMUNICATION SYSTEM(for LHD), Diagnostic DTC:U1002

DTC Code DTC Name
U1002 Lost Communication with Gateway Module (Network Gateway ECU)

DESCRIPTION


DTC No. Detection Item DTC Detection Condition Trouble Area Note
U1002 Lost Communication with Gateway Module (Network Gateway ECU) The network gateway ECU cannot receive signals from all ECUs that have been memorized as those connected to sub bus 2.

  • Open or short in sub bus 2 main lines or connector

  • Short in sub bus 2 branch lines or connector

  • Network gateway ECU

  • Driving support ECU assembly

  • Clearance warning ECU assembly

  • Transmission control ECU assembly

  • Skid control ECU (Brake booster with master cylinder assembly)

  • EV control ECU

  • Blind spot monitor sensor RH

  • Lane departure warning camera

  • No. 2 CAN junction terminal

  • Open or short in No. 1 CAN junction connector

  • Open or short in No. 4 CAN junction connector

Tech Tips

The network gateway ECU stores DTCs when it detects a communication stop or network communication error for ECUs connected to sub bus 2.

Tech Tips

This diagnosis procedure is for when DTC U1002 is output by the network gateway ECU (GTS display: Gateway).

WIRING DIAGRAM

A01MFKCE02
A01MFRZE02

CAUTION / NOTICE / HINT

Note


  • Before measuring the resistance of the CAN bus, turn the power switch off and leave the vehicle for 1 minute or more without operating the key or any switches, or opening or closing the doors. After that, disconnect the cable from the negative (-) auxiliary battery terminal and leave the vehicle for 1 minute or more before measuring the resistance.

  • After turning the power switch off, waiting time may be required before disconnecting the cable from the negative (-) auxiliary battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) auxiliary battery terminal notices before proceeding with work.

    Click here

  • Because the order of diagnosis is important to allow correct diagnosis, make sure to begin troubleshooting using How to Proceed with Troubleshooting when CAN communication system related DTCs are output.

    Click here

  • After performing repairs, perform the DTC check procedure and confirm that the DTCs are not output again.

  • DTC check procedure: Turn the power switch on (IG) and wait at least 21 seconds.

  • After the repair, perform the CAN bus check and check that all the ECUs and sensors connected to the CAN communication system are displayed.

    Click here

Tech Tips


  • Operating the power switch, any other switches or a door triggers related ECU and sensor communication on the CAN. This communication will cause the resistance value to change.

  • Even after DTCs are cleared, if a DTC is stored again after driving the vehicle for a while, the malfunction may be occurring due to vibration of the vehicle. In such a case, wiggling the ECUs or wire harness while performing the inspection below may help determine the cause of the malfunction.

PROCEDURE


  1. CHECK SUB BUS 2


    1. Disconnect the cable from the negative (-) auxiliary battery terminal.

    2. A01MI1BC02
      *a

      Component with harness connected

      (Network Gateway ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      G56-13 (CA2H) - G56-12 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω Below 54 Ω: Short circuit between bus lines
      70 Ω or higher: Open circuit in main bus lines
      G56-13 (CA2H) - G56-4 (GND) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      G56-12 (CA2L) - G56-4 (GND) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G56-13 (CA2H) - G56-2 (BATT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      G56-12 (CA2L) - G56-2 (BATT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      Result
      Result Proceed to
      OK A
      NG (Open circuit in CAN main bus lines) B
      NG (Short circuit between bus lines) C

      • NG (Ground short)

      • NG (+B short)

      		 D

    B

    CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (NETWORK GATEWAY ECU) Click here

    C

    CHECK FOR SHORT IN SUB BUS 2 LINES (NETWORK GATEWAY ECU) Click here

    D

    CHECK FOR SHORT IN SUB BUS 2 LINE (NO. 4 CAN JUNCTION CONNECTOR) Click here

    A

  2. CHECK FOR DTC OUTPUT


    1. Reconnect the cable to the negative (-) auxiliary battery terminal.

    2. Connect the GTS to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the GTS on.

    5. Clear the DTCs.


      Body Electrical > Gateway > Clear DTCs

    6. Turn the power switch off.

    7. Turn the power switch on (IG).

    8. Check for DTCs.


      Body Electrical > Gateway > Trouble Codes
      Result
      Result Proceed to
      DTC U1002 is not output from network gateway ECU (GTS display: Gateway) A
      DTC U1002 is output from network gateway ECU (GTS display: Gateway) B

    A

    SYMPTOM SIMULATION Click here

    B

    REPLACE NETWORK GATEWAY ECU Click here

  3. CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (NETWORK GATEWAY ECU)


    1. A01MGXEC05
      *a

      Front view of wire harness connector

      (to Network Gateway ECU)

      Disconnect the network gateway ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G56-13 (CA2H) - G56-12 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE NETWORK GATEWAY ECU Click here

    NG

  4. CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (NO. 2 CAN JUNCTION TERMINAL)


    1. Reconnect the G56 network gateway ECU connector.

    2. A01MJDLC03
      *a

      Front view of wire harness connector

      (to No. 2 CAN Junction Terminal)

      Disconnect the No. 2 CAN junction terminal connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q36-3 (CANH) - Q36-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 2 CAN JUNCTION TERMINAL

    NG

  5. CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (NO. 4 CAN JUNCTION CONNECTOR)


    1. Reconnect the Q36 No. 2 CAN junction terminal connector.

    2. A01MHGYC07
      *a

      Front view of wire harness connector

      (to No. 4 CAN Junction Connector)
      *b to No. 1 CAN Junction Connector
      *c to Network Gateway ECU

      Disconnect the No. 4 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      G86-4 (CANH) - G86-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 1 CAN junction connector
      G86-5 (CANH) - G86-15 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Network gateway ECU
      Result
      Result Proceed to
      OK A
      NG (Network gateway ECU main lines) B
      NG (No. 1 CAN junction connector main lines) C

    A

    REPLACE NO. 4 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NETWORK GATEWAY ECU - NO. 4 CAN JUNCTION CONNECTOR)

    C

  6. CHECK FOR OPEN IN SUB BUS 2 MAIN LINES (NO. 1 CAN JUNCTION CONNECTOR)


    1. Reconnect the G86 No. 4 CAN junction connector.

    2. A01MIXGC02
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Connector)
      *b to No. 4 CAN Junction Connector
      *c to No. 2 CAN Junction Terminal

      Disconnect the No. 1 CAN junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      Q32-1 (CANH) - Q32-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 4 CAN junction connector
      Q33-1 (CANH) - Q33-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 2 CAN junction terminal
      Result
      Result Proceed to
      OK A
      NG (No. 4 CAN junction connector main lines) B
      NG (No. 2 CAN junction terminal main lines) C

    A

    REPLACE NO. 1 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 4 CAN JUNCTION CONNECTOR)

    C

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION TERMINAL)

  7. CHECK FOR SHORT IN SUB BUS 2 LINES (NETWORK GATEWAY ECU)


    1. A01MGXEC05
      *a

      Front view of wire harness connector

      (to Network Gateway ECU)

      Disconnect the network gateway ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G56-13 (CA2H) - G56-12 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE NETWORK GATEWAY ECU Click here

    NG

  8. CHECK FOR SHORT IN SUB BUS 2 LINES (NO. 2 CAN JUNCTION TERMINAL)


    1. Reconnect the G56 network gateway ECU connector.

    2. A01MJDLC03
      *a

      Front view of wire harness connector

      (to No. 2 CAN Junction Terminal)

      Disconnect the No. 2 CAN junction terminal connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q36-3 (CANH) - Q36-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 2 CAN JUNCTION TERMINAL

    NG

  9. CHECK FOR SHORT IN SUB BUS 2 LINES (NO. 4 CAN JUNCTION CONNECTOR)


    1. Reconnect the Q36 No. 2 CAN junction terminal connector.

    2. Disconnect the No. 4 CAN junction connector.

      A01MHGAC16
      *a

      Front view of wire harness connector

      (to No. 4 CAN Junction Connector)

      		 *b

      to Skid Control ECU (Brake Booster with Master Cylinder Assembly)

      (for Sub Bus 2)
      *c

      to Transmission Control ECU Assembly

      (for Sub Bus 2)

      		 *d

      to No. 1 CAN Junction Connector

      (for Sub Bus 2)
      *e

      to Network Gateway ECU

      (for Sub Bus 2)

      		 *f

      to EV Control ECU

      (for Sub Bus 2)
      *g

      to Driving Support ECU Assembly

      (for Sub Bus 2)

      		 *h

      to Clearance Warning ECU Assembly

      (for Sub Bus 2)
      *i

      to Lane Departure Warning Camera

      (for Sub Bus 2)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      G86-1 (CANH) - G86-11 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Skid control ECU (brake booster with master cylinder assembly)
      G86-3 (CANH) - G86-13 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Transmission control ECU assembly
      G86-4 (CANH) - G86-14 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 1 CAN junction connector
      G86-5 (CANH) - G86-15 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Network gateway ECU
      G86-6 (CANH) - G86-16 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher EV control ECU
      G86-7 (CANH) - G86-17 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Driving support ECU assembly
      G86-8 (CANH) - G86-18 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Clearance warning ECU assembly
      G86-9 (CANH) - G86-19 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Lane departure warning camera
      Result
      Result Proceed to
      OK A
      NG (Network gateway ECU main lines) B
      NG (ECU or sensor branch lines) C
      NG (No. 1 CAN junction connector main lines) D

    A

    REPLACE NO. 4 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NETWORK GATEWAY ECU - NO. 4 CAN JUNCTION CONNECTOR)

    C

    GO TO STEP 11 Click here

    D

  10. CHECK FOR SHORT IN SUB BUS 2 LINES (NO. 1 CAN JUNCTION CONNECTOR)


    1. Reconnect the G86 No. 4 CAN junction connector.

    2. Disconnect the No. 1 CAN junction connector.

      A01MICAC02
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Connector)

      		 *b to No. 4 CAN Junction Connector
      *c to No. 2 CAN Junction Terminal *d to Blind Spot Monitor Sensor RH

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      Q32-1 (CANH) - Q32-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 4 CAN junction connector
      Q33-1 (CANH) - Q33-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 2 CAN junction terminal
      Q34-1 (CANH) - Q34-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Blind spot monitor sensor RH
      Result
      Result Proceed to
      OK A
      NG (No. 4 CAN junction connector main lines) B
      NG (ECU or sensor branch lines) C
      NG (No. 2 CAN junction terminal main lines) D

    A

    REPLACE NO. 1 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 4 CAN JUNCTION CONNECTOR)

    D

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION TERMINAL)

    C

  11. CHECK FOR SHORT IN SUB BUS 2 LINES (ECU, SENSOR)


    1. Reconnect all wire harness connectors.

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the short circuited branch line is connected.

      Click here

    3. A01MI1BC02
      *a

      Component with harness connected

      (Network Gateway ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G56-13 (CA2H) - G56-12 (CA2L) Cable disconnected from negative (-) auxiliary battery terminal 54 to 69 Ω

      Tech Tips

      If the resistance becomes normal (between 54 and 69 Ω) when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

      Result
      Result
      OK
      NG

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINES OR CONNECTOR

  12. CHECK FOR SHORT IN SUB BUS 2 LINE (NO. 4 CAN JUNCTION CONNECTOR)


    1. Disconnect the No. 4 CAN junction connector.

      A01MIL9C04
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 4 CAN Junction Connector)

      		 *b

      to Skid Control ECU (Brake Booster with Master Cylinder Assembly)

      (for Sub Bus 2)
      *c

      to Transmission Control ECU Assembly

      (for Sub Bus 2)

      		 *d

      to No. 1 CAN Junction Connector

      (for Sub Bus 2)
      *e

      to Network Gateway ECU

      (for Sub Bus 2)

      		 *f

      to EV Control ECU

      (for Sub Bus 2)
      *g

      to Driving Support ECU Assembly

      (for Sub Bus 2)

      		 *h

      to Clearance Warning ECU Assembly

      (for Sub Bus 2)
      *i

      to Lane Departure Warning Camera

      (for Sub Bus 2)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result Connected to
      G86-1 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short Skid control ECU (brake booster with master cylinder assembly)
      G86-11 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G86-3 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short Transmission control ECU assembly
      G86-13 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G86-4 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short No. 1 CAN junction connector
      G86-14 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G86-5 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short Network gateway ECU
      G86-15 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G86-6 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short EV control ECU
      G86-16 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G86-7 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short Driving support ECU assembly
      G86-17 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G86-8 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short Clearance warning ECU assembly
      G86-18 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G86-9 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short Lane departure warning camera
      G86-19 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G86-1 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Skid control ECU (brake booster with master cylinder assembly)
      G86-11 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      G86-3 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Transmission control ECU assembly
      G86-13 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      G86-4 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short No. 1 CAN junction connector
      G86-14 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      G86-5 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Network gateway ECU
      G86-15 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      G86-6 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short EV control ECU
      G86-16 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      G86-7 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Driving support ECU assembly
      G86-17 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      G86-8 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Clearance warning ECU assembly
      G86-18 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      G86-9 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Lane departure warning camera
      G86-19 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 2 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.

      Result
      Result Proceed to
      OK A
      NG (ECU or sensor branch line) B
      NG (No. 1 junction connector main line) C
      NG (Network gateway ECU main line) D

    A

    REPLACE NO. 4 CAN JUNCTION CONNECTOR

    B

    GO TO STEP 15 Click here

    D

    CHECK FOR SHORT IN SUB BUS 2 LINE (NETWORK GATEWAY ECU) Click here

    C

  13. CHECK FOR SHORT IN SUB BUS 2 LINE (NO. 1 CAN JUNCTION CONNECTOR)


    1. Reconnect the G86 No. 4 CAN junction connector.

    2. Disconnect the No. 1 CAN junction connector.

      A01MI08C01
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Connector)

      		 *b to No. 4 CAN Junction Connector
      *c to No. 2 CAN Junction Terminal *d to Blind Spot Monitor Sensor RH

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result Connected to
      Q32-1 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short No. 4 CAN junction connector
      Q32-2 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      Q33-1 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short No. 2 CAN junction terminal
      Q33-2 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      Q34-1 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short Blind spot monitor sensor RH
      Q34-2 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      Q32-1 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short No. 4 CAN junction connector
      Q32-2 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      Q33-1 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short No. 2 CAN junction terminal
      Q33-2 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      Q34-1 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Blind spot monitor sensor RH
      Q34-2 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 2 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.

      Result
      Result Proceed to
      OK A
      NG (No. 4 CAN junction connector main line) B
      NG (ECU or sensor branch line) C
      NG (No. 2 CAN junction terminal main line) D

    A

    REPLACE NO. 1 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 4 CAN JUNCTION CONNECTOR)

    C

    CHECK FOR SHORT IN SUB BUS 2 LINE (ECU, SENSOR) Click here

    D

    CHECK FOR SHORT IN SUB BUS 2 LINE (NO. 2 CAN JUNCTION TERMINAL) Click here

  14. CHECK FOR SHORT IN SUB BUS 2 LINE (NETWORK GATEWAY ECU)


    1. Reconnect the G86 No. 4 CAN junction connector.

    2. A01MGXEC06
      *a

      Front view of wire harness connector

      (to Network Gateway ECU)

      Disconnect the network gateway ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      G56-13 (CA2H) - G56-4 (GND) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      G56-12 (CA2L) - G56-4 (GND) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G56-13 (CA2H) - G56-2 (BATT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      G56-12 (CA2L) - G56-2 (BATT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 2 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.

      Result
      Result
      OK
      NG

    OK

    REPLACE NETWORK GATEWAY ECU Click here

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 4 CAN JUNCTION CONNECTOR - NETWORK GATEWAY ECU)

  15. CHECK FOR SHORT IN SUB BUS 2 LINE (ECU, SENSOR)


    1. Reconnect all wire harness connectors.

    2. Disconnect the connector that includes terminals CANH and CANL from the ECU or sensor to which the bus line shorted to +B or shorted to GND is connected.

      Click here

    3. A01MI1BC02
      *a

      Component with harness connected

      (Network Gateway ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      G56-13 (CA2H) - G56-4 (GND) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      G56-12 (CA2L) - G56-4 (GND) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G56-13 (CA2H) - G56-2 (BATT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      G56-12 (CA2L) - G56-2 (BATT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 2 inspection.

      • If the resistance becomes normal when the connector is disconnected from the ECU or sensor, there may be a short in the ECU or sensor.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.

      Result
      Result
      OK
      NG

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINE OR CONNECTOR

  16. CHECK FOR SHORT IN SUB BUS 2 LINE (NO. 2 CAN JUNCTION TERMINAL)


    1. Reconnect the Q32, Q33 and Q34 No. 1 CAN junction connectors.

    2. Disconnect the No. 2 CAN junction terminal connector.

      A01MI0KC01
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 2 CAN Junction Terminal)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      G36-3 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      G36-2 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G36-3 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      G36-2 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short

      Tech Tips


      • It is only necessary to perform the inspection in the above table for the result (short circuit) that was obtained in the Check Sub Bus 2 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 2 inspection.

      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 2 CAN JUNCTION TERMINAL

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 1 CAN JUNCTION CONNECTOR - NO. 2 CAN JUNCTION TERMINAL)