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

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

DESCRIPTION


DTC No. Detection Item DTC Detection Condition Trouble Area Note
U1002 Lost Communication with Gateway Module (Main Body ECU) The main body ECU (multiplex network body ECU) cannot receive signals from all ECUs that have been memorized as those connected to sub bus 1.

  • Open or short in sub bus 1 main lines or connector

  • Short in sub bus 1 branch lines or connector

  • Main body ECU (multiplex network body ECU)

  • Outer mirror control ECU assembly LH

  • Outer mirror control ECU assembly RH

  • Multiplex tilt and telescopic ECU

  • Headlight light control ECU sub-assembly LH

  • Position control ECU and switch assembly

  • No. 1 CAN junction terminal

  • Open or short in No. 6 CAN junction connector

  • Open or short in No. 7 CAN junction connector

Tech Tips

The main body ECU (multiplex network body ECU) stores DTCs when it detects a communication stop or network communication error for ECUs connected to sub bus 1.

Tech Tips

This diagnosis procedure is for when DTC U1002 is output by the main body ECU (multiplex network body ECU) (GTS display: Main Body).

WIRING DIAGRAM

A01MIGJE03
A01MGMUE02

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 20 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

  • Inspect the fuses for circuits related to this system before performing the following procedure.

  • If the main body ECU (multiplex network body ECU) is replaced, refer to Service Bulletin.

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 1


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

    2. A01MGEHC01
      *1 DLC3
      *a

      Component with harness connected

      (Main Body ECU (Multiplex Network Body ECU))

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      G5-9 (CANP) - G5-10 (CANN) 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
      G5-9 (CANP) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      G5-10 (CANN) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G5-9 (CANP) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      G5-10 (CANN) - G8-16 (BAT) 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 1 MAIN LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    C

    CHECK FOR SHORT IN SUB BUS 1 LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    D

    CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 6 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 > Main Body > Clear DTCs

    6. Turn the power switch off.

    7. Turn the power switch on (IG).

    8. Check for DTCs.


      Body Electrical > Main Body > Trouble Codes
      Result
      Result Proceed to
      DTC U1002 is not output from main body ECU (multiplex network body ECU) (GTS display: Main Body) A
      DTC U1002 is output from main body ECU (multiplex network body ECU) (GTS display: Main Body) B

    A

    SYMPTOM SIMULATION Click here

    B

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

  3. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. A01MINOC43
      *a

      Front view of wire harness connector

      (to Main Body ECU (Multiplex Network Body ECU))

      Disconnect the main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G5-9 (CANP) - G5-10 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

  4. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (NO. 1 CAN JUNCTION TERMINAL)


    1. Reconnect the G5 main body ECU (multiplex network body ECU) connector.

    2. A01MJDLC04
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Terminal)

      Disconnect the No. 1 CAN junction terminal.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q35-3 (CANP) - Q35-2 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 1 CAN JUNCTION TERMINAL

    NG

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


    1. Reconnect the Q35 No. 1 CAN junction terminal.

    2. A01MHSKC02
      *a

      Front view of wire harness connector

      (to No. 6 CAN Junction Connector)
      *b to Main Body ECU (Multiplex Network Body ECU)
      *c to No. 7 CAN Junction Connector

      Disconnect the No. 6 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
      G88-1 (CANH) - G88-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Main body ECU (multiplex network body ECU)
      G88-4 (CANH) - G88-5 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 7 CAN junction connector
      Result
      Result Proceed to
      OK A
      NG (Main body ECU (multiplex network body ECU) main lines) B
      NG (No. 7 CAN junction connector main lines) C

    A

    REPLACE NO. 6 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    C

  6. CHECK FOR OPEN IN SUB BUS 1 MAIN LINES (NO. 7 CAN JUNCTION CONNECTOR)


    1. Reconnect the G88 No. 6 CAN junction connector.

    2. A01MHGYC06
      *a

      Front view of wire harness connector

      (to No. 7 CAN Junction Connector)
      *b to No. 6 CAN Junction Connector
      *c to No. 1 CAN Junction Terminal

      Disconnect the No. 7 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
      Q31-1 (CANH) - Q31-11 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 6 CAN junction connector
      Q31-2 (CANH) - Q31-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 1 CAN junction terminal
      Result
      Result Proceed to
      OK A
      NG (No. 6 CAN junction connector main lines) B
      NG (No. 1 CAN junction terminal main lines) C

    A

    REPLACE NO. 7 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - NO. 7 CAN JUNCTION CONNECTOR)

    C

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION TERMINAL)

  7. CHECK FOR SHORT IN SUB BUS 1 LINES (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. A01MINOC43
      *a

      Front view of wire harness connector

      (to Main Body ECU (Multiplex Network Body ECU))

      Disconnect the main body ECU (multiplex network body ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G5-9 (CANP) - G5-10 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

  8. CHECK FOR SHORT IN SUB BUS 1 LINES (NO. 1 CAN JUNCTION TERMINAL)


    1. Reconnect the G5 main body ECU (multiplex network body ECU) connector.

    2. A01MJDLC04
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Terminal)

      Disconnect the No. 1 CAN junction terminal.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      Q35-3 (CANP) - Q35-2 (CANN) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω
      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 1 CAN JUNCTION TERMINAL

    NG

  9. CHECK FOR SHORT IN SUB BUS 1 LINES (NO. 6 CAN JUNCTION CONNECTOR)


    1. Reconnect the Q35 No. 1 CAN junction terminal.

    2. Disconnect the No. 6 CAN junction connectors.

      A01MFQ1C06
      *a

      Front view of wire harness connector

      (to No. 6 CAN Junction Connector)

      		 *b to Main Body ECU (Multiplex Network Body ECU)
      *c to No. 7 CAN Junction Connector *d to Multiplex Tilt and Telescopic ECU
      *e to Position Control ECU and Switch Assembly *f to Outer Mirror Control ECU Assembly LH
      *g to Outer Mirror Control ECU Assembly RH *h to Headlight Light Control ECU Sub-assembly LH

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      G88-1 (CANH) - G88-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω Main body ECU (multiplex network body ECU)
      G88-4 (CANH) - G88-5 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 7 CAN junction connector
      G88-7 (CANH) - G88-8 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Multiplex tilt and telescopic ECU
      G89-3 (CANH) - G89-2 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Position control ECU and switch assembly
      G89-6 (CANH) - G89-5 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Outer mirror control ECU assembly LH
      G89-9 (CANH) - G89-8 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Outer mirror control ECU assembly RH
      G89-12 (CANH) - G89-11 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Headlight light control ECU sub-assembly LH
      Result
      Result Proceed to
      OK A
      NG (Main body ECU (multiplex network body ECU) main lines) B
      NG (ECU or sensor branch lines) C
      NG (No. 7 CAN junction connector main lines) D

    A

    REPLACE NO. 6 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

    D

    CHECK FOR SHORT IN SUB BUS 1 LINES (NO. 7 CAN JUNCTION CONNECTOR) Click here

    C

  10. CHECK FOR SHORT IN SUB BUS 1 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. A01MHFZC02
      *a

      Component with harness connected

      (Main Body ECU (Multiplex Network Body ECU))

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G5-9 (CANP) - G5-10 (CANN) 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

  11. CHECK FOR SHORT IN SUB BUS 1 LINES (NO. 7 CAN JUNCTION CONNECTOR)


    1. Reconnect the G88 and G89 No. 6 CAN junction connectors.

    2. Disconnect the No. 7 CAN junction connector.

      A01MIIDC04
      *a

      Front view of wire harness connector

      (to No. 7 CAN Junction Connector)

      		 *b to No. 6 CAN Junction Connector
      *c to No. 1 CAN Junction Terminal - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition Connected to
      Q31-1 (CANH) - Q31-11 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 6 CAN junction connector
      Q31-2 (CANH) - Q31-12 (CANL) Cable disconnected from negative (-) auxiliary battery terminal 108 to 132 Ω No. 1 CAN junction terminal
      Result
      Result Proceed to
      OK A
      NG (No. 6 CAN junction connector main lines) B
      NG (No. 1 CAN junction terminal main lines) C

    A

    REPLACE NO. 7 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - NO. 7 CAN JUNCTION CONNECTOR)

    C

    REPAIR OR REPLACE CAN MAIN BUS LINES OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION TERMINAL)

  12. CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 6 CAN JUNCTION CONNECTOR)


    1. Disconnect the No. 6 CAN junction connectors.

      A01MG3PC03
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 6 CAN Junction Connector)

      		 *b to Main Body ECU (Multiplex Network Body ECU)
      *c to No. 7 CAN Junction Connector *d to Multiplex Tilt and Telescopic ECU
      *e to Position Control ECU and Switch Assembly *f to Outer Mirror Control ECU Assembly LH
      *g to Outer Mirror Control ECU Assembly RH *h Headlight Light Control ECU Sub-assembly LH

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result Connected to
      G88-1 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short Main body ECU (multiplex network body ECU)
      G88-2 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G88-4 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short No. 7 CAN junction connector
      G88-5 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G88-7 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short Multiplex tilt and telescopic ECU
      G88-8 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G89-3 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short Position control ECU and switch assembly
      G89-2 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G89-6 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short Outer mirror control ECU assembly LH
      G89-5 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G89-9 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short Outer mirror control ECU assembly RH
      G89-8 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G89-12 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short Headlight light control ECU sub-assembly LH
      G89-11 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G88-1 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Main body ECU (multiplex network body ECU)
      G88-2 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      G88-4 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short No. 7 CAN junction connector
      G88-5 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      G88-7 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Multiplex tilt and telescopic ECU
      G88-8 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      G89-3 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Position control ECU and switch assembly
      G89-2 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      G89-6 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Outer mirror control ECU assembly LH
      G89-5 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      G89-9 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Outer mirror control ECU assembly RH
      G89-8 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      G89-12 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short Headlight light control ECU sub-assembly LH
      G89-11 (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 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 1 inspection.

      Result
      Result Proceed to
      OK A
      NG (ECU or sensor branch line) B
      NG (No. 7 CAN junction connector main line) C
      NG (Main body ECU (multiplex network body ECU) main line) D

    A

    REPLACE NO. 6 CAN JUNCTION CONNECTOR

    C

    CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 7 CAN JUNCTION CONNECTOR) Click here

    D

    CHECK FOR SHORT IN SUB BUS 1 LINE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU)) Click here

    B

  13. CHECK FOR SHORT IN SUB BUS 1 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. A01MGEHC01
      *1 DLC3
      *a

      Component with harness connected

      (Main Body ECU (Multiplex Network Body ECU))

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      G5-9 (CANP) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      G5-10 (CANN) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G5-9 (CANP) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      G5-10 (CANN) - 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 1 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 1 inspection.

      Result
      Result
      OK
      NG

    OK

    REPLACE CORRESPONDING ECU OR SENSOR

    NG

    REPAIR OR REPLACE CORRESPONDING ECU OR SENSOR BRANCH LINE OR CONNECTOR

  14. CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 7 CAN JUNCTION CONNECTOR)


    1. Reconnect the G88 and G89 No. 6 CAN junction connectors.

    2. Disconnect the No. 7 CAN junction connector.

      A01MHIFC02
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 7 CAN Junction Connector)

      		 *b to No. 6 CAN Junction Connector
      *c to No. 1 CAN Junction Terminal - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result Connected to
      Q31-1 (CANH) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short No. 6 CAN junction connector
      Q31-11 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      Q31-2 (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 terminal
      Q31-12 (CANL) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      Q31-1 (CANH) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short No. 6 CAN junction connector
      Q31-11 (CANL) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANL +B short
      Q31-2 (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 terminal
      Q31-12 (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 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 1 inspection.

      Result
      Result Proceed to
      OK A
      NG (No. 6 junction connector main line) B
      NG (No. 1 CAN junction terminal main line) C

    A

    REPLACE NO. 7 CAN JUNCTION CONNECTOR

    B

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - NO. 7 CAN JUNCTION CONNECTOR)

    C

    CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 1 CAN JUNCTION TERMINAL) Click here

  15. CHECK FOR SHORT IN SUB BUS 1 LINE (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))


    1. Reconnect the G88 and G89 No. 6 CAN junction connectors.

    2. A01MH0BC15
      *1 DLC3
      *a

      Front view of wire harness connector

      (to Main Body ECU (Multiplex Network Body ECU))

      Disconnect the main body ECU (multiplex network body ECU).

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      G5-9 (CANP) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      G5-10 (CANN) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      G5-9 (CANP) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      G5-10 (CANN) - 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 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 1 inspection.

      Result
      Result
      OK
      NG

    OK

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) Click here

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 6 CAN JUNCTION CONNECTOR - MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU))

  16. CHECK FOR SHORT IN SUB BUS 1 LINE (NO. 1 CAN JUNCTION TERMINAL)


    1. Reconnect the Q31 No. 7 CAN junction connector.

    2. Disconnect the No. 1 CAN junction terminal.

      A01MHQYC02
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to No. 1 CAN Junction Terminal)

      		 - -

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      Q35-3 (CANP) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANH ground short
      Q35-2 (CANN) - G8-4 (CG) Cable disconnected from negative (-) auxiliary battery terminal 200 Ω or higher Below 200 Ω: CANL ground short
      Q35-3 (CANP) - G8-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Below 6 kΩ: CANH +B short
      Q35-2 (CANN) - 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 1 inspection.

      • Find the necessary inspection from the Result column that matches the result in the Result column from the Check Sub Bus 1 inspection.

      Result
      Result
      OK
      NG

    OK

    REPLACE NO. 1 CAN JUNCTION TERMINAL

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (NO. 7 CAN JUNCTION CONNECTOR - NO. 1 CAN JUNCTION TERMINAL)