CAN COMMUNICATION SYSTEM, Diagnostic DTC:U1002

DTC Code DTC Name
U1002 Lost Communication with Gateway Module (Power Management2)

DESCRIPTION


DTC No. DTC Detection Condition Trouble Area
U1002 Power management control ECU cannot receive signals from all ECUs that have been memorized as those connected to the power management bus.

  • Open or short in power management bus main line or connector

  • Open or short in power management bus branch line or connector

  • Power management control ECU

  • ECM

  • Air conditioning amplifier assembly

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

  • CAN No. 1 junction connector (for LHD)

  • CAN No. 3 junction connector (for RHD)

  • CAN No. 5 junction connector

Tech Tips

This diagnosis procedure is for when DTC U1002 is output by the power management control ECU (Intelligent tester display: PM2 Gateway).

WIRING DIAGRAM

A003Y4JE04

INSPECTION PROCEDURE

Note


  • 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.

  • Turn the power switch off before measuring the resistances between CAN main bus lines and between CAN branch lines.

  • Turn the power switch off before inspecting CAN bus lines for a ground short.

  • After the power switch is turned off, check that the key reminder warning system and light reminder warning system are not operating.

  • Before measuring the resistance, leave the vehicle as is for at least 1 minute and do not operate the power switch, any other switches or the doors. If any doors need to be opened in order to check connectors, open the doors and leave them open.

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 CAN BUS LINES


    1. Turn the power switch off.

    2. A003XG0E02
      Text in Illustration
      *a

      Component with harness connector

      (Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition Result
      H4-31 (CA3P) - H4-30 (CA3N) Power switch off 54 to 69 Ω

      Below 54 Ω:

      Short circuit between bus lines

      70 Ω or higher:

      Open circuit in a main bus line
      H4-31 (CA3P) - H4-4 (E12) Power switch off 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H4-30 (CA3N) - H4-4 (E12) Power switch off 200 Ω or higher

      Below 200 Ω:

      CANL ground short

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

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

      Standard Resistance
      Tester Connection Condition Specified Condition Result
      H4-31 (CA3P) - H4-7 (AM21) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H4-30 (CA3N) - H4-7 (AM21) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANL +B short
      Result
      Result Proceed to
      OK A
      Open circuit in CAN main bus line B
      Short circuit between bus lines C

      • Ground short

      • +B short

      		 D

    B

    CHECK FOR OPEN IN CAN BUS LINES (POWER MANAGEMENT CONTROL ECU) Click here

    C

    CHECK FOR SHORT IN CAN BUS LINES (POWER MANAGEMENT CONTROL ECU) Click here

    D

    CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 5 J/C) Click here

    A

  2. CHECK FOR DTC OUTPUT


    1. Clear the DTCs.

    2. Turn the power switch off.

    3. Turn the power switch on (IG) and recheck for DTCs.

      Result
      Result Proceed to

      U1002 is output from power management control ECU

      (Intelligent tester display/PM2 Gateway)

      		 A
      Other DTC is output B

    B

    GO TO DIAGNOSIS PROCEDURE INDICATED BY OUTPUT DTC

    A

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  3. CHECK FOR OPEN IN CAN BUS LINES (POWER MANAGEMENT CONTROL ECU)


    1. A003ZOXE25
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the power management control ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H4-31 (CA3P) - H4-30 (CA3N) Power switch off 108 to 132 Ω
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

    B

    CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 5 J/C - CAN NO. 1 J/C) Click here

    C

    CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 5 J/C - CAN NO. 3 J/C) Click here

    A

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  4. CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 5 J/C - CAN NO. 1 J/C)


    1. Reconnect the power management control ECU connector.

    2. Disconnect the wire harness connector from CAN No. 5 junction connector front side.

    3. A003VCVE09
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)
      *b to CAN No. 1 Junction Connector

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H97-2 (CANH) - H97-3 (CANL) Power switch off 108 to 132 Ω

    NG

    CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 1 J/C - CAN NO. 5 J/C) Click here

    OK

  5. CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)


    1. Reconnect the wire harness connector to the CAN No. 5 junction connector front side.

    2. Disconnect the wire harness connector from the CAN No. 5 junction connector rear side.

    3. A003VCVE10
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)
      *b to Power Management Control ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H98-6 (CANH) - H98-4 (CANL) Power switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

    OK

    REPLACE CAN NO. 5 JUNCTION CONNECTOR

  6. CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 1 J/C - CAN NO. 5 J/C)


    1. Reconnect the wire harness connector to the CAN No. 5 junction connector rear side.

    2. Disconnect the instrument panel wire from the CAN No. 1 junction connector.

    3. A003VCVE11
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *b to CAN No. 5 Junction Connector

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H112-3 (CANH) - H112-9 (CANL) Power switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 5 J/C)

    OK

  7. CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 1 J/C - ECM)


    1. Reconnect the instrument panel wire to the CAN No. 1 junction connector.

    2. Disconnect the engine room main wire from the CAN No. 1 junction connector.

    3. A003VCVE12
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *b to ECM

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A57-4 (CANH) - A57-10 (CANL) Power switch off 108 to 132 Ω

    NG

    CHECK FOR OPEN IN CAN BUS LINES (ECM) Click here

    OK

    REPLACE CAN NO. 1 JUNCTION CONNECTOR

  8. CHECK FOR OPEN IN CAN BUS LINES (ECM)


    1. Reconnect the engine room main wire to the CAN No. 1 junction connector.

    2. A003W8AE56
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A60-12 (CANP) - A60-4 (CANN) Power switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - ECM)

    OK

    REPLACE ECM Click here

  9. CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 5 J/C - CAN NO. 3 J/C)


    1. Reconnect the power management control ECU connector.

    2. Disconnect the wire harness connector from CAN No. 5 junction connector front side.

    3. A003VCVE09
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)
      *b to CAN No. 3 Junction Connector

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H97-2 (CANH) - H97-3 (CANL) Power switch off 108 to 132 Ω

    NG

    CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 3 J/C - CAN NO. 5 J/C) Click here

    OK

  10. CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)


    1. Reconnect the wire harness connector to the CAN No. 5 junction connector front side.

    2. Disconnect the wire harness connector from the CAN No. 5 junction connector rear side.

    3. A003VCVE10
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)
      *b to Power Management Control ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H98-6 (CANH) - H98-4 (CANL) Power switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

    OK

    REPLACE CAN NO. 5 JUNCTION CONNECTOR

  11. CHECK FOR OPEN IN CAN BUS LINES (CAN NO. 3 J/C - CAN NO. 5 J/C)


    1. Reconnect the wire harness connector to the CAN No. 5 junction connector rear side.

    2. Disconnect the instrument panel wire from the CAN No. 3 junction connector.

    3. A003VCVE23
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)
      *b to CAN No. 5 Junction Connector

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H142-3 (CANH) - H142-9 (CANL) Power switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 3 J/C - CAN NO. 5 J/C)

    OK

  12. CHECK FOR OPEN IN CAN BUS LINE (CAN NO. 3 J/C - ECM)


    1. Reconnect the instrument panel wire to the CAN No. 3 junction connector.

    2. Disconnect the engine room main wire from the CAN No. 3 junction connector.

    3. A003VCVE24
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)
      *b to ECM

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A72-4 (CANH) - A72-10 (CANL) Power switch off 108 to 132 Ω

    NG

    CHECK FOR OPEN IN CAN BUS LINES (ECM) Click here

    OK

    REPLACE CAN NO. 3 JUNCTION CONNECTOR

  13. CHECK FOR OPEN IN CAN BUS LINES (ECM)


    1. Reconnect the engine room main wire to the CAN No. 3 junction connector.

    2. A003W8AE56
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A60-12 (CANP) - A60-4 (CANN) Power switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 3 J/C - ECM)

    OK

    REPLACE ECM Click here

  14. CHECK FOR SHORT IN CAN BUS LINES (POWER MANAGEMENT CONTROL ECU)


    1. A003ZOXE25
      Text in Illustration
      *a

      Rear view of wire harness connector

      (to Power Management Control ECU)

      Disconnect the power management control ECU connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H4-31 (CA3P) - H4-30 (CA3N) Power switch off 108 to 132 Ω

    NG

    CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU) Click here

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  15. CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)


    1. Reconnect the power management control ECU connector.

    2. Disconnect the wire harness connector from the CAN No. 5 junction connector rear side.

    3. A003VCVE10
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)
      *b to Power Management Control ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H98-6 (CANH) - H98-4 (CANL) Power switch off 108 to 132 Ω
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    B

    CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 5 J/C - CAN NO. 3 J/C) Click here

    C

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 5 J/C - POWER MANAGEMENT CONTROL ECU)

    A

  16. CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 5 J/C - CAN NO. 1 J/C)


    1. Disconnect the wire harness connector from CAN No. 5 junction connector front side.

    2. A003VCVE09
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)
      *b to CAN No. 1 Junction Connector

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H97-2 (CANH) - H97-3 (CANL) Power switch off 108 to 132 Ω

    NG

    CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 1 J/C - CAN NO. 5 J/C) Click here

    OK

  17. CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 5 J/C - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the air conditioning amplifier assembly connector.

    2. A003VCVE13
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)
      *b to Air Conditioning Amplifier Assembly

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H98-5 (CANH) - H98-3 (CANL) Power switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (CAN NO. 5 J/C - AIR CONDITIONING AMPLIFIER ASSEMBLY)

    OK

  18. CHECK FOR SHORT IN CAN BUS LINES (AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Reconnect the wire harness connector to the CAN No. 5 junction connector front side and rear side.

    2. A003XCVE78
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H85-11 (CANH) - H85-12 (CANL) Power switch off 54 to 69 Ω

    NG

    REPLACE CAN NO. 5 JUNCTION CONNECTOR

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  19. CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 1 J/C - CAN NO. 5 J/C)


    1. Reconnect the wire harness connector to the CAN No. 5 junction connector front side and rear side.

    2. Disconnect the instrument panel wire from the CAN No. 1 junction connector.

    3. A003VCVE11
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *b to CAN No. 5 Junction Connector

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H112-3 (CANH) - H112-9 (CANL) Power switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 5 J/C)

    OK

  20. CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 1 J/C - ECM)


    1. Disconnect the engine room main wire from the CAN No. 1 junction connector.

    2. A003VCVE12
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *b to ECM

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A57-4 (CANH) - A57-10 (CANL) Power switch off 108 to 132 Ω

    NG

    CHECK FOR SHORT IN CAN BUS LINES (ECM) Click here

    OK

  21. CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 1 J/C - SKID CONTROL ECU)


    1. Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.

    2. A003VCVE14
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)
      *b to Skid Control ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A57-3 (CANH) - A57-9 (CANL) Power switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (CAN NO. 1 J/C - SKID CONTROL ECU)

    OK

  22. CHECK FOR SHORT IN CAN BUS LINES (SKID CONTROL ECU)


    1. Reconnect the instrument panel wire and engine room main wire to the CAN No. 1 junction connector.

    2. A003VYDE58
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A61-35 (CA2H) - A61-34 (CA2L) Power switch off 54 to 69 Ω

    NG

    REPLACE CAN NO. 1 JUNCTION CONNECTOR

    OK

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU) Click here

  23. CHECK FOR SHORT IN CAN BUS LINES (ECM)


    1. Reconnect the instrument panel wire and engine room main wire to the CAN No. 1 junction connector.

    2. A003W8AE56
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A60-12 (CANP) - A60-4 (CANN) Power switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - ECM)

    OK

    REPLACE ECM Click here

  24. CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 5 J/C - CAN NO. 3 J/C)


    1. Disconnect the wire harness connector from CAN No. 5 junction connector front side.

    2. A003VCVE09
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)
      *b to CAN No. 3 Junction Connector

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H97-2 (CANH) - H97-3 (CANL) Power switch off 108 to 132 Ω

    NG

    CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 3 J/C - CAN NO. 5 J/C) Click here

    OK

  25. CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 5 J/C - AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Disconnect the air conditioning amplifier assembly connector.

    2. A003VCVE13
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)
      *b to Air Conditioning Amplifier Assembly

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H98-5 (CANH) - H98-3 (CANL) Power switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (CAN NO. 5 J/C - AIR CONDITIONING AMPLIFIER ASSEMBLY)

    OK

  26. CHECK FOR SHORT IN CAN BUS LINES (AIR CONDITIONING AMPLIFIER ASSEMBLY)


    1. Reconnect the wire harness connector to the CAN No. 5 junction connector front side and rear side.

    2. A003XCVE78
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Air Conditioning Amplifier Assembly)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H85-11 (CANH) - H85-12 (CANL) Power switch off 54 to 69 Ω

    NG

    REPLACE CAN NO. 5 JUNCTION CONNECTOR

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

  27. CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 3 J/C - CAN NO. 5 J/C)


    1. Reconnect the wire harness connector to the CAN No. 5 junction connector front side and rear side.

    2. Disconnect the instrument panel wire from the CAN No. 3 junction connector.

    3. A003VCVE23
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)
      *b to CAN No. 5 Junction Connector

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      H142-3 (CANH) - H142-9 (CANL) Power switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 3 J/C - CAN NO. 5 J/C)

    OK

  28. CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 3 J/C - ECM)


    1. Disconnect the engine room main wire from the CAN No. 3 junction connector.

    2. A003VCVE24
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)
      *b to ECM

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A72-4 (CANH) - A72-10 (CANL) Power switch off 108 to 132 Ω

    NG

    CHECK FOR SHORT IN CAN BUS LINES (ECM) Click here

    OK

  29. CHECK FOR SHORT IN CAN BUS LINES (CAN NO. 3 J/C - SKID CONTROL ECU)


    1. Disconnect the skid control ECU (brake booster with master cylinder assembly) connector.

    2. A003VCVE25
      Text in Illustration
      *a

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)
      *b to Skid Control ECU

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A72-3 (CANH) - A72-9 (CANL) Power switch off 1 MΩ or higher

    NG

    REPAIR OR REPLACE CAN BRANCH LINE OR CONNECTOR (CAN NO. 3 J/C - SKID CONTROL ECU)

    OK

  30. CHECK FOR SHORT IN CAN BUS LINES (SKID CONTROL ECU)


    1. Reconnect the instrument panel wire and engine room main wire to the CAN No. 3 junction connector.

    2. A003VYDE58
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Skid Control ECU)

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A61-35 (CA2H) - A61-34 (CA2L) Power switch off 54 to 69 Ω

    NG

    REPLACE CAN NO. 3 JUNCTION CONNECTOR

    OK

    REPLACE BRAKE BOOSTER WITH MASTER CYLINDER ASSEMBLY (SKID CONTROL ECU) Click here

  31. CHECK FOR SHORT IN CAN BUS LINES (ECM)


    1. Reconnect the instrument panel wire and engine room main wire to the CAN No. 3 junction connector.

    2. A003W8AE56
      Text in Illustration
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Switch Condition Specified Condition
      A60-12 (CANP) - A60-4 (CANN) Power switch off 108 to 132 Ω

    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 3 J/C - ECM)

    OK

    REPLACE ECM Click here

  32. CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 5 J/C)


    1. Disconnect the wire harness connector from the CAN No. 5 junction connector rear side.

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

      A003Y5NE01
      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      H98-6 (CANH) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANH ground short Power management control ECU
      H98-4 (CANL) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANL ground short
      H98-5 (CANH) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANH ground short Air conditioning amplifier assembly
      H98-3 (CANL) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANL ground short
      H98-6 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Power management control ECU
      H98-4 (CANL) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      H98-5 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Air conditioning amplifier assembly
      H98-3 (CANL) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      Text in Illustration
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)

      		 *b to Air Conditioning Amplifier Assembly
      *c to Power Management Control ECU - -

      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 Power Management Bus inspection.


    NG

    CHECK CAN BUS LINE (ECU) Click here

    OK

  33. CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 5 J/C MAIN LINE)


    1. Disconnect the wire harness connector from CAN No. 5 junction connector front side.

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

      A003Y5NE02
      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      H97-2 (CANH) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANH ground short CAN No. 1 junction connector
      H97-3 (CANL) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANL ground short
      H97-2 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      H97-3 (CANL) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      Text in Illustration
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to CAN No. 5 Junction Connector)

      		 *b to CAN No. 1 Junction Connector
      Result
      Result Proceed to
      OK A
      NG (for LHD) B
      NG (for RHD) C

      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 Power Management Bus inspection.


    B

    CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 5 J/C - CAN NO. 1 J/C) Click here

    C

    CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 5 J/C - CAN NO. 3 J/C) Click here

    A

    REPLACE CAN NO. 5 JUNCTION CONNECTOR

  34. CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 5 J/C - CAN NO. 1 J/C)


    1. Disconnect the instrument panel wire from the CAN No. 1 junction connector.

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

      A003Y5NE04
      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      H112-3 (CANH) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANH ground short CAN No. 5 junction connector
      H112-9 (CANL) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANL ground short
      H112-3 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      H112-9 (CANL) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      Text in Illustration
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)

      		 *b to CAN No. 5 Junction Connector

      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 Power Management Bus inspection.


    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 1 J/C - CAN NO. 5 J/C)

    OK

  35. CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 1 J/C)


    1. Disconnect the engine room main wire from the CAN No. 1 junction connector.

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

      A003Y5NE03
      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      A57-3 (CANH) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANH ground short Skid control ECU
      A57-9 (CANL) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANL ground short
      A57-4 (CANH) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANH ground short ECM
      A57-10 (CANL) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANL ground short
      A57-3 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Skid control ECU
      A57-9 (CANL) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      A57-4 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short ECM
      A57-10 (CANL) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for 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 Power Management Bus inspection.

      Text in Illustration
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)

      		 *b to Skid Control ECU
      *c to ECM - -

    B

    CHECK CAN BUS LINE (ECU) Click here

    OK

    REPLACE CAN NO. 1 JUNCTION CONNECTOR

  36. CHECK CAN BUS LINE (ECU)


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

    2. A003XG0E02
      Text in Illustration
      *a

      Component with harness connector

      (Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose
      H4-31 (CA3P) - H4-4 (E12) Power switch off 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H4-30 (CA3N) - H4-4 (E12) Power switch off 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H4-31 (CA3P) - H4-7 (AM21) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H4-30 (CA3N) - H4-7 (AM21) 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 Power Management Bus inspection.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU WIRE

    OK

    REPLACE CORRESPONDING ECU

  37. CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 5 J/C - CAN NO. 3 J/C)


    1. Disconnect the instrument panel wire from the CAN No. 3 junction connector.

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

      A003Y5NE05
      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      H142-3 (CANH) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANH ground short CAN No. 5 junction connector
      H142-9 (CANL) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANL ground short
      H142-3 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short
      H142-9 (CANL) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      Text in Illustration
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to CAN No. 1 Junction Connector)

      		 *b to CAN No. 5 Junction Connector

      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 Power Management Bus inspection.


    NG

    REPAIR OR REPLACE CAN MAIN BUS LINE OR CONNECTOR (CAN NO. 3 J/C - CAN NO. 5 J/C)

    OK

  38. CHECK FOR SHORT IN CAN BUS LINE (CAN NO. 3 J/C)


    1. Disconnect the engine room main wire from the CAN No. 3 junction connector.

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

      A003Y5NE06
      Standard Resistance
      Tester Connection Condition Specified Condition Purpose Connected to
      A72-3 (CANH) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANH ground short Skid control ECU
      A72-9 (CANL) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANL ground short
      A72-4 (CANH) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANH ground short ECM
      A72-10 (CANL) - H44-4 (CG) Power switch off 200 Ω or higher Inspection for CANL ground short
      A72-3 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short Skid control ECU
      A72-9 (CANL) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANL +B short
      A72-4 (CANH) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for CANH +B short ECM
      A72-10 (CANL) - H44-16 (BAT) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher Inspection for 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 Power Management Bus inspection.

      Text in Illustration
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to CAN No. 3 Junction Connector)

      		 *b to Skid Control ECU
      *c to ECM - -

    NG

    CHECK FOR SHORT IN CAN BUS LINE (ECU) Click here

    OK

    REPLACE CAN NO. 3 JUNCTION CONNECTOR

  39. CHECK FOR SHORT IN CAN BUS LINE (ECU)


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

    2. A003XG0E02
      Text in Illustration
      *a

      Component with harness connector

      (Power Management Control ECU)

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

      Standard Resistance
      Tester Connection Condition Specified Condition Purpose
      H4-31 (CA3P) - H4-4 (E12) Power switch off 200 Ω or higher

      Below 200 Ω:

      CANH ground short
      H4-30 (CA3N) - H4-4 (E12) Power switch off 200 Ω or higher

      Below 200 Ω:

      CANL ground short
      H4-31 (CA3P) - H4-7 (AM21) Cable disconnected from negative (-) auxiliary battery terminal 6 kΩ or higher

      Below 6 kΩ:

      CANH +B short
      H4-30 (CA3N) - H4-7 (AM21) 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 Power Management Bus inspection.


    NG

    REPAIR OR REPLACE CORRESPONDING ECU WIRE

    OK

    REPLACE CORRESPONDING ECU