Click here

METER / GAUGE SYSTEM Speed Signal Circuit

Click here
Click here
DTC Code DTC Name
  Speed Signal Circuit
Click here

DESCRIPTION

The combination meter assembly receives the vehicle speed signal from this circuit. The wheel speed sensors produce an output that varies according to the vehicle speed. The wheel speed sensor output is received by the skid control ECU, which uses this information to create the vehicle speed sensor signal*1. The vehicle speed sensor signal consists of pulses sent to the combination meter assembly from the skid control ECU. To create this signal, 12 V is output from IG2, which is behind a resistor in the combination meter assembly. This voltage is sent to the skid control ECU. The pulse signal is created by switching the transistor in the skid control ECU on and off, making the voltage on the wire drop to 0 V. A similar system is used for the output of this signal from the combination meter assembly via terminal +S. A voltage of 12 V or 5 V is applied to terminal +S from each ECU or relay that is connected to this terminal. The transistor in the combination meter assembly is controlled by the signal from the skid control ECU. When this transistor is turned on, this transistor makes the voltage supplied by the various ECUs (via their respective internal resistors) drop to 0 V. Each ECU connected to terminal +S of the combination meter assembly controls its respective system based on the pulse signal.


Tip:

This circuit is used for the systems connected to terminal +S. This signal is not used for combination meter assembly operation. Combination meter assembly components such as the speedometer operate using data received via CAN communication.

Click here

WIRING DIAGRAM

Click here

PROCEDURE


  1. Click here

    INSPECT COMBINATION METER ASSEMBLY (INPUT VOLTAGE)


    1. B00486CE01

      Disconnect the combination meter assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      F1-6 (+S) - Body ground Ignition switch ON 4.5 to 14 V
      Table 1. Text in Illustration
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)
      Tip:

      If any of the ECUs specified in the wiring diagram supplies power to the combination meter assembly, the combination meter assembly will output a waveform.

    3. Reconnect the combination meter assembly connector.


  2. Click here

    INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)


    1. B0047M5E03

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

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A78-24 (SP1)*1 - Body ground Ignition switch ON 11 to 14 V
      A79-24 (SP1)*2 - Body ground Ignition switch ON 11 to 14 V

      • *1: for LHD with CVT, and RHD

      • *2: for LHD except CVT

      Table 2. Text in Illustration
      *A for LHD with CVT, and RHD
      *B for LHD except CVT
      *a

      Front view of wire harness connector

      (to Brake Actuator Assembly (Skid Control ECU))

    3. Reconnect the brake actuator assembly (skid control ECU) connector.


  3. Click here

    INSPECT BRAKE ACTUATOR ASSEMBLY (INPUT WAVEFORM)


    1. B0046LZE13

      Check the input waveform.


      1. Remove the combination meter assembly with the connector(s) still connected.

      2. Connect an oscilloscope to terminal F1-5 (SI) and body ground.

      3. Turn the ignition switch to ON.

      4. Turn the wheel slowly.

      5. Check the signal waveform according to the condition(s) in the table below.

        Item Condition
        Tool setting 5 V/DIV., 20 ms./DIV.
        Vehicle condition Driving at approx. 20 km/h (12 mph)
        OK
        The waveform is displayed as shown in the illustration.
        Tip:

        As the vehicle speed increases, the cycle of the waveform narrows.

        Table 3. Text in Illustration
        *a

        Component with harness connected

        (Combination Meter Assembly)
        Table 4. Result
        Result Proceed to
        OK A
        NG (for LHD) B
        NG (for RHD) C

  4. Click here

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)


    1. Disconnect the F1 combination meter assembly connector.

    2. Disconnect the A78*1 or A79*2 brake actuator assembly (skid control ECU) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A78-24 (SP1)*1 - F1-5 (SI) Always Below 1 Ω
      A79-24 (SP1)*2 - F1-5 (SI) Always Below 1 Ω
      A78-24 (SP1)*1 - Body ground Always 10 kΩ or higher
      A79-24 (SP1)*2 - Body ground Always 10 kΩ or higher

      • *1: for LHD with CVT, and RHD

      • *2: for LHD except CVT


    • OK

      REPLACE COMBINATION METER ASSEMBLY (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  5. Click here

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)


    1. Disconnect the 3B instrument panel junction block assembly connector.

    2. Disconnect the F1 combination meter assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F1-6 (+S) - 3B-15 Always Below 1 Ω
      F1-6 (+S) - Body ground Always 10 kΩ or higher

    4. Reconnect the instrument panel junction block assembly connector.

    5. Reconnect the combination meter assembly connector.


    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. Click here

    SYSTEM CHECK


    1. Check the vehicle specifications.

      Table 5. Result
      Result Proceed to
      w/ Rain Sensor A
      w/o Rain Sensor B

  7. Click here

    INSPECT WINDSHIELD WIPER RELAY ASSEMBLY


    1. B004873E02

      Disconnect the instrument panel junction block assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3A-37 - Body ground Ignition switch ON 4.5 to 14 V
      Table 6. Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

    3. Reconnect the instrument panel junction block assembly connector.


  8. Click here

    SYSTEM CHECK


    1. Check the vehicle specifications.

      Table 7. Result
      Result Proceed to
      w/ Entry and Start System A
      w/o Entry and Start System B

  9. Click here

    INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. B004873E02

      Disconnect the instrument panel junction block assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3A-38 - Body ground Ignition switch ON 4.5 to 14 V
      Table 8. Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

    3. Reconnect the instrument panel junction block assembly connector.


  10. Click here

    SYSTEM CHECK


    1. Check the vehicle specifications.

      Table 9. Result
      Result Proceed to
      for Radio Receiver Type A
      for Radio and Display Type B
      w/o Audio C

  11. Click here

    INSPECT RADIO RECEIVER ASSEMBLY


    1. B004873E02

      Disconnect the instrument panel junction block assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3A-16 - Body ground Ignition switch ON 4.5 to 14 V
      Table 10. Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

  12. Click here

    INSPECT ECM


    1. B0046A4E02

      Disconnect the instrument panel junction block assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3C-39 - Body ground Ignition switch ON 4.5 to 14 V
      Table 11. Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

    3. Reconnect the instrument panel junction block assembly connector.


  13. Click here

    INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. B004873E02

      Disconnect the instrument panel junction block assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3A-16 - Body ground Ignition switch ON 4.5 to 14 V
      Table 12. Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

  14. Click here

    CHECK VEHICLE TYPE


    1. Check the Vehicle type.

      Table 13. Result
      Result Proceed to
      except 2ZR-FE A
      for 2ZR-FE B

  15. Click here

    INSPECT ECM


    1. B0046A4E02

      Disconnect the instrument panel junction block assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3C-39 - Body ground Ignition switch ON 4.5 to 14 V
      Table 14. Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

    3. Reconnect the instrument panel junction block assembly connector.


  16. Click here

    INSPECT ECM


    1. B0046A4E02

      Disconnect the instrument panel junction block assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3C-39 - Body ground Ignition switch ON 4.5 to 14 V
      Table 15. Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

    3. Reconnect the instrument panel junction block assembly connector.


  17. Click here

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - WINDSHIELD WIPER RELAY)


    1. Disconnect the 3A instrument panel junction block assembly connector.

    2. Disconnect the F72 windshield wiper relay assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-37 - F72-24 (SPD) Always Below 1 Ω
      3A-37 - Body ground Always 10 kΩ or higher

    4. Reconnect the instrument panel junction block assembly connector.

    5. Reconnect the windshield wiper relay assembly connector.


    • OK

      REPLACE WINDSHIELD WIPER RELAY ASSEMBLY (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  18. Click here

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - CERTIFICATION ECU)


    1. Disconnect the 3A instrument panel junction block assembly connector.

    2. Disconnect the F63 certification ECU (smart key ECU assembly) connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-38 - F63-27 (SPD) Always Below 1 Ω
      3A-38 - Body ground Always 10 kΩ or higher

    4. Reconnect the instrument panel junction block assembly connector.

    5. Reconnect the certification ECU (smart key ECU assembly) connector.


    • OK

      REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  19. Click here

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - RADIO RECEIVER ASSEMBLY)


    1. Disconnect the 3A instrument panel junction block assembly connector.

    2. Disconnect the F47 radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-16 - F47-17 (SPD) Always Below 1 Ω
      3A-16 - Body ground Always 10 kΩ or higher

    4. Reconnect the instrument panel junction block assembly connector.

    5. Reconnect the radio receiver assembly connector.


    • OK

      REPLACE RADIO RECEIVER ASSEMBLY

    • NG

      REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)

  20. Click here

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - RADIO AND DISPLAY RECEIVER ASSEMBLY)


    1. Disconnect the 3A instrument panel junction block assembly connector.

    2. Disconnect the F115 radio and display receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-16 - F115-17 (SPD) Always Below 1 Ω
      3A-16 - Body ground Always 10 kΩ or higher

    4. Reconnect the instrument panel junction block assembly connector.

    5. Reconnect the radio and display receiver assembly connector.


    • OK

      REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  21. Click here

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECM)


    1. Disconnect the 3C instrument panel junction block assembly connector.

    2. Disconnect the A58*1, A93*2, A59*3 or A108*4 ECM connector.

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


      • *1: for 2NR-FKE

      • *2: for 1KR-FE

      • *3: for 1ND-TV without DPF

      • *4: for 1ND-TV with DPF

      Standard Resistance
      Table 16. for 2NR-FKE
      Tester Connection Condition Specified Condition
      3C-39 - A58-44 (SPD) Always Below 1 Ω
      3C-39 - Body ground Always 10 kΩ or higher
      Table 17. for 1KR-FE
      Tester Connection Condition Specified Condition
      3C-39 - A93-41 (SPD) Always Below 1 Ω
      3C-39 - Body ground Always 10 kΩ or higher
      Table 18. for 1ND-TV with DPF
      Tester Connection Condition Specified Condition
      3C-39 - A108-51 (SPD) Always Below 1 Ω
      3C-39 - Body ground Always 10 kΩ or higher
      Table 19. for 1ND-TV without DPF
      Tester Connection Condition Specified Condition
      3C-39 - A59-25 (SPD) Always Below 1 Ω
      3C-39 - Body ground Always 10 kΩ or higher
      Table 20. Result
      Result Proceed to
      NG A
      OK (for 2NR-FKE) B
      OK (for 1KR-FE) C
      OK (for 1ND-TV with DPF) D
      OK (for 1ND-TV without DPF) E

    4. Reconnect the instrument panel junction block assembly connector.

    5. Reconnect the ECM connector.


  22. Click here

    INSPECT NETWORK GATEWAY ECU


    1. B0046A4E02

      Disconnect the instrument panel junction block assembly connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3C-39 - Body ground Ignition switch ON 4.5 to 14 V
      Table 21. Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

    3. Reconnect the instrument panel junction block assembly connector.


  23. Click here

    CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - NETWORK GATEWAY ECU)


    1. Disconnect the 3C instrument panel junction block assembly connector.

    2. Disconnect the A118 network gateway ECU connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      3C-39 - A118-22 (SPD) Always Below 1 Ω
      3C-39 - Body ground Always 10 kΩ or higher

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  24. Click here

    CHECK HARNESS AND CONNECTOR (NETWORK GATEWAY ECU - ECM)


    1. Disconnect the A118 network gateway ECU connector.

    2. Disconnect the A116 ECM connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      A118-6 (CA1L) - A116-21 (CANN) Always Below 1 Ω
      A118-7 (CA1H) - A116-9 (CANP) Always Below 1 Ω
      A118-6 (CA1L) - Body ground Always 10 kΩ or higher
      A118-7 (CA1H) - Body ground Always 10 kΩ or higher

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  25. Click here

    CHECK NETWORK GATEWAY ECU


    1. Replace the network gateway ECU.

      (Click here)

    2. Check for DTCs.

      (Click here)

      OK
      DTCs are not output.

    • OK

      END (NETWORK GATEWAY ECU IS DEFECTIVE)

    • NG

      REPLACE ECM (See PageClick here)