CAN COMMUNICATION SYSTEM TERMINALS OF ECU

Tech Tips

Operating the ignition switch, any switches or any doors triggers related ECU and sensor communication with the CAN, which causes resistance variation.


  1. DISCONNECT CABLE FROM NEGATIVE BATTERY TERMINAL


    1. Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and CAN branch wire.

      CAUTION:

      Wait at least 90 seconds after disconnecting the cable from the negative (-) battery terminal to disable the airbag system.

      Note


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

      • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

      • When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

  2. JUNCTION CONNECTOR


    1. No. 1 Junction Connector

      A01CJ03E03
      Text in Illustration
      *a for Electric Vehicle Control ECU assembly (V Bus) *b for Electric Vehicle Control ECU assembly (V Bus)
      *c for No. 2 Junction Connector (V Bus) *d for ECM (V Bus)
      *e for ECM (Control Bus) *f for No. 2 Junction Connector (Control Bus)
      *g for Electric Vehicle Control ECU assembly (Control Bus) *h for Electric Vehicle Control ECU assembly (Control Bus)
      No. 1 Junction Connector Wiring Color Connect to
      J76-3 (CANH) R Electric vehicle control ECU assembly (V bus)
      J76-14 (CANL) G
      J76-4 (CANH) R Electric vehicle control ECU assembly (V bus)
      J76-15 (CANL) G
      J76-5 (CANH) R No. 2 junction connector (V bus)
      J76-16 (CANL) G
      J76-6 (CANH) R ECM (V bus)
      J76-17 (CANL) G
      J76-7 (CANH) L ECM (Control bus)
      J76-18 (CANL) G
      J76-8 (CANH) L No. 2 junction connector (Control bus)
      J76-19 (CANL) G
      J76-9 (CANH) L Electric vehicle control ECU assembly (Control bus)
      J76-20 (CANL) G
      J76-10 (CANH) L Electric vehicle control ECU assembly (Control bus)
      J76-21 (CANL) G

    2. No. 2 Junction Connector

      A01CJ03E04
      Text in Illustration
      *a for Airbag ECU Assembly *b for DLC3
      *c for No. 3 Junction Connector (V Bus) *d for No. 1 Junction Connector (V Bus)
      *e for No. 1 Junction Connector (Control Bus) *f for No. 3 Junction Connector (Control Bus)
      No. 2 Junction Connector Wiring Color Connect to
      J72-3 (CANH) R Airbag ECU assembly
      J72-14 (CANL) G
      J72-4 (CANH) R DLC3
      J72-15 (CANL) G
      J72-5 (CANH) R No. 3 junction connector (V bus)
      J72-16 (CANL) G
      J72-6 (CANH) R No. 1 junction connector (V bus)
      J72-17 (CANL) G
      J72-7 (CANH) L No. 1 junction connector (Control bus)
      J72-18 (CANL) G
      J72-8 (CANH) L No. 3 junction connector (Control bus)
      J72-19 (CANL) G

    3. No. 3 Junction Connector

      A01CJ03E02
      Text in Illustration
      *a for No. 2 Junction Connector (Control Bus) *b for No. 6 Junction Connector
      *c for Tachograph Assembly *d for No. 2 Junction Connector (V Bus)
      *e for No. 4 Junction Connector - -
      No. 3 Junction Connector Wiring Color Connect to
      J82-1 (CANH) L No. 2 junction connector (Control bus)
      J82-12 (CANL) G
      J82-4 (CANH) L No. 6 junction connector
      J82-15 (CANL) G
      J82-7 (CANH) R Tachograph assembly
      J82-18 (CANL) G
      J82-8 (CANH) R No. 2 junction connector (V bus)
      J82-19 (CANL) G
      J82-9 (CANH) R No. 4 junction connector
      J82-20 (CANL) G

    4. No. 4 Junction Connector

      A01CHREE11
      Text in Illustration
      *a for No. 3 Junction Connector (V Bus) *b for Brake Actuator Assembly (Skid Control ECU) (V Bus)
      *c for No. 5 Junction Connector - -
      No. 4 Junction Connector Wiring Color Connect to
      J56-3 (CANH) R No. 3 junction connector (V bus)
      J56-8 (CANL) G
      J56-4 (CANH) R Brake actuator assembly (skid control ECU) (V bus)
      J56-9 (CANL) G
      J56-5 (CANH) R No. 5 junction connector
      J56-10 (CANL) G
    5. A01CHJZE06

      No. 5 Junction Connector

      No. 5 Junction Connector Wiring Color Connect to
      J84-1 (CA1H) R No. 4 junction connector
      J84-2 (CA1L) G

    6. No. 6 Junction Connector

      A01CHREE12
      Text in Illustration
      *a for No. 3 Junction Connector (Control Bus) *b for Brake Actuator Assembly (Skid Control ECU) (Control Bus)
      *c for Combination Meter Assembly - -
      No. 6 Junction Connector Wiring Color Connect to
      J58-3 (CANH) L No. 3 junction connector (Control bus)
      J58-8 (CANL) G
      J58-4 (CANH) L Brake actuator assembly (skid control ECU) (Control bus)
      J58-9 (CANL) G
      J58-5 (CANH) L Combination meter assembly
      J58-10 (CANL) G

    7. No. 7 Junction Connector

      A01CHREE13
      Text in Illustration
      *a for ECM (Sub Bus) *b for No. 8 Junction Connector
      *c for Turbocharger Sub-assembly - -
      No. 7 Junction Connector Wiring Color Connect to
      J60-3 (CANH) W ECM (Sub bus)
      J60-8 (CANL) B
      J60-4 (CANH) W No. 8 junction connector
      J60-9 (CANL) B
      J60-5 (CANH) W Turbocharger sub-assembly
      J60-10 (CANL) B

    8. No. 8 Junction Connector

      A01CHREE14
      Text in Illustration
      *a for EGR Valve Assembly *b for No. 7 Junction Connector
      *c for No. 9 Junction Connector - -
      No. 8 Junction Connector Wiring Color Connect to
      J59-3 (CANH) W EGR valve assembly
      J59-8 (CANL) B
      J59-4 (CANH) W No. 7 junction connector
      J59-9 (CANL) B
      J59-5 (CANH) W No. 9 junction connector
      J59-10 (CANL) B
    9. A01CIOME05

      No. 9 Junction Connector

      No. 9 Junction Connector Wiring Color Connect to
      J85-2 (+) W No. 8 junction connector
      J85-1 (-) B

  3. CHECK DLC3


    1. A01CH4ZE32

      Disconnect the cable from the negative (-) battery terminal before measuring the resistances of the CAN main wire and CAN branch wire.

      Note


      • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice before proceeding with work Click here.

      • When disconnecting the cable, some systems need to be initialized after the cable is reconnected Click here.

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

      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      D34-6 (CANH) - D34-14 (CANL) R - G Ignition switch off 54 to 69 Ω
      D34-6 (CANH) - D34-4 (CG) R - W-B Ignition switch off 200 Ω or higher
      D34-14 (CANL) - D34-4 (CG) G - W-B Ignition switch off 200 Ω or higher
      D34-6 (CANH) - D34-16 (BAT) R - B Ignition switch off 6 kΩ or higher
      D34-14 (CANL) - D34-16 (BAT) G - B Ignition switch off 6 kΩ or higher

  4. CHECK ECM

    A01CHK9E16
    Text in Illustration
    *A for V Bus *B for Control Bus
    *C for Sub Bus - -

    1. Disconnect the E36, E38, E39 and E40 ECM connectors.

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

      for V Bus
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      E40-7 (CANH) - E40-1 (CANL) R - G Ignition switch off 108 to 132 Ω
      E40-7 (CANH) - E38-1 (E1) R - W-B Ignition switch off 200 Ω or higher
      E40-1 (CANL) - E38-1 (E1) G - W-B Ignition switch off 200 Ω or higher
      E40-7 (CANH) - E39-23 (BATT) R - G Ignition switch off 6 kΩ or higher
      E40-1 (CANL) - E39-23 (BATT) G - G Ignition switch off 6 kΩ or higher
      for Control Bus
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      E40-8 (CANP) - E40-2 (CANN) L - G Ignition switch off 108 to 132 Ω
      E40-8 (CANP) - E38-1 (E1) L - W-B Ignition switch off 200 Ω or higher
      E40-2 (CANN) - E38-1 (E1) G - W-B Ignition switch off 200 Ω or higher
      E40-8 (CANP) - E39-23 (BATT) L - G Ignition switch off 6 kΩ or higher
      E40-2 (CANN) - E39-23 (BATT) G - G Ignition switch off 6 kΩ or higher
      for Sub Bus
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      E36-12 (CAN+) - E36-6 (CAN-) W - B Ignition switch off 108 to 132 Ω
      E36-12 (CAN+) - E38-1 (E1) W - W-B Ignition switch off 200 Ω or higher
      E36-6 (CAN-) - E38-1 (E1) B - W-B Ignition switch off 200 Ω or higher
      E36-12 (CAN+) - E39-23 (BATT) W - G Ignition switch off 6 kΩ or higher
      E36-6 (CAN-) - E39-23 (BATT) B - G Ignition switch off 6 kΩ or higher

  5. CHECK ELECTRIC VEHICLE CONTROL ECU ASSEMBLY

    A01CHLRE05
    Text in Illustration
    *A for V Bus *B for Control Bus

    1. Disconnect the E41 and E43 electric vehicle control ECU assembly connectors.

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

      for V Bus
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      E41-4 (CANH) - E41-5 (CANL) R - G Ignition switch off 54 to 69 Ω
      E41-8 (CANP) - E41-9 (CANN) R - G Ignition switch off 54 to 69 Ω
      E41-4 (CANH) - E43-5 (GND1) R - W-B Ignition switch off 200 Ω or higher
      E41-5 (CANL) - E43-5 (GND1) G - W-B Ignition switch off 200 Ω or higher
      E41-8 (CANP) - E43-5 (GND1) R - W-B Ignition switch off 200 Ω or higher
      E41-9 (CANN) - E43-5 (GND1) G - W-B Ignition switch off 200 Ω or higher
      E41-4 (CANH) - E43-1 (AM1) R - B Ignition switch off 6 kΩ or higher
      E41-5 (CANL) - E43-1 (AM1) G - B Ignition switch off 6 kΩ or higher
      E41-8 (CANP) - E43-1 (AM1) R - B Ignition switch off 6 kΩ or higher
      E41-9 (CANN) - E43-1 (AM1) G - B Ignition switch off 6 kΩ or higher
      for Control Bus
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      E41-6 (CA1+) - E41-7 (CA1-) L - G Ignition switch off 54 to 69 Ω
      E41-2 (CA2+) - E41-3 (CA2-) L - G Ignition switch off 54 to 69 Ω
      E41-6 (CA1+) - E43-5 (GND1) L - W-B Ignition switch off 200 Ω or higher
      E41-7 (CA1-) - E43-5 (GND1) G - W-B Ignition switch off 200 Ω or higher
      E41-2 (CA2+) - E43-5 (GND1) L - W-B Ignition switch off 200 Ω or higher
      E41-3 (CA2-) - E43-5 (GND1) G - W-B Ignition switch off 200 Ω or higher
      E41-6 (CA1+) - E43-1 (AM1) L - B Ignition switch off 6 kΩ or higher
      E41-7 (CA1-) - E43-1 (AM1) G - B Ignition switch off 6 kΩ or higher
      E41-2 (CA2+) - E43-1 (AM) L - B Ignition switch off 6 kΩ or higher
      E41-3 (CA2-) - E43-1 (AM1) G - B Ignition switch off 6 kΩ or higher

  6. CHECK BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU)

    A01CJ70E03
    Text in Illustration
    *A for V Bus *B for Control Bus

    1. Disconnect the B9 brake actuator assembly (skid control ECU) connector.

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

      for V Bus
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      B9-15 (CH) - B9-26 (CL-) R - G Ignition switch off 54 to 69 Ω
      B9-15 (CH) - B9-1 (GND1) R - W-B Ignition switch off 200 Ω or higher
      B9-26 (CL-) - B9-1 (GND1) G - W-B Ignition switch off 200 Ω or higher
      B9-15 (CH) - D34-16 (BAT) R - B Ignition switch off 6 kΩ or higher
      B9-26 (CL-) - D34-16 (BAT) G - B Ignition switch off 6 kΩ or higher
      for Control Bus
      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      B9-25 (CANH) - B9-14 (CANL) L - G Ignition switch off 54 to 69 Ω
      B9-25 (CANH) - B9-1 (GND1) L - W-B Ignition switch off 200 Ω or higher
      B9-14 (CANL) - B9-1 (GND1) G - W-B Ignition switch off 200 Ω or higher
      B9-25 (CANH) - D34-16 (BAT) L - B Ignition switch off 6 kΩ or higher
      B9-14 (CANL) - D34-16 (BAT) G - B Ignition switch off 6 kΩ or higher

  7. CHECK AIRBAG ECU ASSEMBLY

    A01CGSRE03

    1. Disconnect the A30 airbag ECU assembly connector Click here.

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

      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      A30-18 (CANH) - A30-10 (CANL) R - G Ignition switch off 54 to 69 Ω
      A30-18 (CANH) - A30-19 (E1) R - W-B Ignition switch off 200 Ω or higher
      A30-10 (CANL) - A30-19 (E1) G - W-B Ignition switch off 200 Ω or higher
      A30-18 (CANH) - D34-16 (BAT) R - B Ignition switch off 6 kΩ or higher
      A30-10 (CANL) - D34-16 (BAT) G - B Ignition switch off 6 kΩ or higher

  8. CHECK COMBINATION METER ASSEMBLY

    A01CI5FE04

    1. Disconnect the C18 and C19 combination meter assembly connectors.

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

      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      C19-14 (CANH) - C19-13 (CANL) L - G Ignition switch off 108 to 132 Ω
      C19-14 (CANH) - C18-36 (SE) L - BR Ignition switch off 200 Ω or higher
      C19-13 (CANL) - C18-36 (SE) G - BR Ignition switch off 200 Ω or higher
      C19-14 (CANH) - C18-40 (B) L - B Ignition switch off 6 kΩ or higher
      C19-13 (CANL) - C18-40 (B) G - B Ignition switch off 6 kΩ or higher

  9. CHECK TURBOCHARGER SUB-ASSEMBLY

    A01CH8YE03

    1. Disconnect the T13 turbocharger sub-assembly connector.

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

      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      T13-4 (CANH) - T13-3 (CANL) W - B Ignition switch off 54 to 69 Ω
      T13-4 (CANH) - T13-2 (GND) W - W-B Ignition switch off 200 Ω or higher
      T13-3 (CANL) - T13-2 (GND) B - W-B Ignition switch off 200 Ω or higher
      T13-4 (CANH) - D34-16 (BAT) W - B Ignition switch off 6 kΩ or higher
      T13-3 (CANL) - D34-16 (BAT) B - B Ignition switch off 6 kΩ or higher

  10. CHECK EGR VALVE ASSEMBLY

    A01CIF9E03

    1. Disconnect the E31 EGR valve assembly connector.

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

      Terminal No. (Symbol) Wiring Color Switch Condition Specified Condition
      E31-5 (CANH) - E31-2 (CANL) W - B Ignition switch off 54 to 69 Ω
      E31-5 (CANH) - E31-1 (E) W - W-B Ignition switch off 200 Ω or higher
      E31-2 (CANL) - E31-1 (E) B - W-B Ignition switch off 200 Ω or higher
      E31-5 (CANH) - D34-16 (BAT) W - B Ignition switch off 6 kΩ or higher
      E31-2 (CANL) - D34-16 (BAT) B - B Ignition switch off 6 kΩ or higher