CAN COMMUNICATION SYSTEM(for RHD without Central Gateway ECU) ECM Communication Stop Mode

DESCRIPTION

Detection Item Symptom Trouble Area
ECM Communication Stop Mode

Either condition is met:


  • "ECM (Engine)" is not displayed on "CAN Bus Check".

    Click here

  • Communication system DTCs (DTCs that start with U) that are output correspond to "ECM Communication Stop Mode" in "DTC Combination Table".

    Click here


  • Power source circuit of ECM

  • ECM ground circuit

  • ECM CAN main wire or connector

  • ECM

WIRING DIAGRAM

Figure 1. for 2TR-FE:

B00279YE16

Figure 2. for 2KD-FTV:

B00270LE06

Figure 3. for 1GD-FTV, 2GD-FTV:

B0028F9E13

Figure 4. for 1GR-FE:

B00279YE06

CAUTION / NOTICE / HINT

Note


  • 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

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

  • 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

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

  • DTC check procedure: Turn the ignition switch to ON, wait at least 20 seconds, and then drive the vehicle at a speed of 15 km/h (9 mph) or more for 3 seconds or more.

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

  • 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 VEHICLE TYPE


    1. Check vehicle type.

      Result
      Result Proceed to
      for 2TR-FE A
      for 1GR-FE B
      for 2KD-FTV C
      for 1GD-FTV, 2GD-FTV D

    B

    CHECK FOR OPEN IN CAN BUS WIRE (ECM CAN MAIN WIRE) Click here

    C

    CHECK FOR OPEN IN CAN BUS WIRE (ECM CAN MAIN WIRE) Click here

    D

    CHECK FOR OPEN IN CAN BUS WIRE (ECM CAN MAIN WIRE) Click here

    A

  2. CHECK FOR OPEN IN CAN BUS WIRE (ECM CAN MAIN WIRE)


    1. B0024UTC06
      *a

      Front view of wire harness connector

      (to ECM)

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

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Connector Specified Condition
      G45-13 (CANH) - G45-14 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE ECM CAN MAIN WIRE OR CONNECTOR (CANH, CANL)

    OK

  3. CHECK HARNESS AND CONNECTOR (ECM - BATTERY AND BODY GROUND)


    1. Connect the cable to the negative (-) battery terminal.

      Note

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

      Click here

      B0024J1C03
      *a

      Front view of wire harness connector

      (to ECM)

      		 - -

    2. Disconnect the ECM connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G46-3 (BATT) - Body ground Always 11 to 14 V
      G46-1 (+B) - Body ground Battery positive (+) voltage applied to terminal G45-6 (MREL) 11 to 14 V
      G46-2 (+B2) - Body ground Battery positive (+) voltage applied to terminal G45-6 (MREL) 11 to 14 V
      G46-8 (IGSW) - Body ground Ignition switch ON 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C52-3 (E1) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  4. CHECK FOR OPEN IN CAN BUS WIRE (ECM CAN MAIN WIRE)


    1. B00271GC01
      *a

      Front view of wire harness connector

      (to ECM)

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

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Connector Specified Condition
      G88-31 (CANH) - G88-25 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE ECM CAN MAIN WIRE OR CONNECTOR (CANH, CANL)

    OK

  5. CHECK HARNESS AND CONNECTOR (ECM - BATTERY AND BODY GROUND)


    1. Connect the cable to the negative (-) battery terminal.

      Note

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

      Click here

      B00267QC01
      *a

      Front view of wire harness connector

      (to ECM)

      		 - -

    2. Disconnect the ECM connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G87-24 (BATT) - Body ground Always 11 to 14 V
      G87-23 (+B) - Body ground Battery positive (+) voltage applied to terminal G88-36 (MREL) 11 to 14 V
      G87-22 (+B2) - Body ground Battery positive (+) voltage applied to terminal G88-36 (MREL) 11 to 14 V
      G87-21 (IGSW) - Body ground Ignition switch ON 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C13-23 (E01) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. CHECK FOR OPEN IN CAN BUS WIRE (ECM CAN MAIN WIRE)


    1. B0024UTC07
      *a

      Front view of wire harness connector

      (to ECM)

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

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G83-24 (CANH) - G83-23 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE ECM CAN MAIN WIRE OR CONNECTOR (CANH, CANL)

    OK

  7. CHECK HARNESS AND CONNECTOR (ECM - BATTERY AND BODY GROUND)


    1. Connect the cable to the negative (-) battery terminal.

      Note

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

      Click here

      B00259JC01
      *a

      Front view of wire harness connector

      (to ECM)

      		 - -

    2. Disconnect the ECM connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G83-2 (BATT) - Body ground Always 11 to 14 V
      G84-1 (+B) - Body ground Battery positive (+) voltage applied to terminal G84-8 (MREL) 11 to 14 V
      G84-9 (IGSW) - Body ground Ignition switch ON 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C56-7 (E1) - Body ground Always Below 1 Ω
      C55-7 (E01) - Body ground Always Below 1 Ω
      C55-6 (E02) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  8. CHECK FOR OPEN IN CAN BUS WIRE (ECM CAN MAIN WIRE)


    1. B0024UTC10
      *a

      Front view of wire harness connector

      (to ECM)

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

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G85-17 (CANH) - G85-28 (CANL) Cable disconnected from negative (-) battery terminal 108 to 132 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE ECM CAN MAIN WIRE OR CONNECTOR (CANH, CANL)

    OK

  9. CHECK HARNESS AND CONNECTOR (ECM - BATTERY AND BODY GROUND)


    1. Connect the cable to the negative (-) battery terminal.

      Note

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

      Click here

      B0027U0C03
      *a

      Front view of wire harness connector

      (to ECM)

      		 - -

    2. Disconnect the ECM connectors.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      G86-1 (BATT) - Body ground Always 11 to 14 V
      G86-2 (+B) - Body ground Battery positive (+) voltage applied to terminal G85-14 (MREL) 11 to 14 V
      G86-3 (+B2) - Body ground Battery positive (+) voltage applied to terminal G85-14 (MREL) 11 to 14 V
      G86-4 (+B3) - Body ground Battery positive (+) voltage applied to terminal G85-14 (MREL) 11 to 14 V
      G86-18 (IGSW) - Body ground Ignition switch ON 11 to 14 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C60-1 (E1) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM for 1GD-FTV: REPLACE ECM Click here
    REPLACE ECM for 2GD-FTV: REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR