METER / GAUGE SYSTEM Speed Signal Circuit

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.


Tech Tips

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.

WIRING DIAGRAM

A01VILQE02

PROCEDURE


  1. INSPECT COMBINATION METER ASSEMBLY (INPUT VOLTAGE)


    1. A01VI9PE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      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

      Tech Tips

      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.


    NG

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

    OK

  2. INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)


    1. A01VKG2E02
      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))

      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

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


    NG

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

    OK

  3. INSPECT BRAKE ACTUATOR ASSEMBLY (INPUT WAVEFORM)


    1. A01VFU0E13
      Text in Illustration
      *a

      Component with harness connected

      (Combination Meter Assembly)

      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.

        Tech Tips

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

        Result
        Result Proceed to
        OK A
        NG (for LHD) B
        NG (for RHD) C

    A

    REPLACE COMBINATION METER ASSEMBLY Click here

    B

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

    C

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

  4. 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. 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.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. SYSTEM CHECK


    1. Check the vehicle specifications.

      Result
      Result Proceed to
      w/ Rain Sensor A
      w/o Rain Sensor B

    B

    SYSTEM CHECK Click here

    A

  7. INSPECT WINDSHIELD WIPER RELAY ASSEMBLY


    1. A01VE9VE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      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

    3. Reconnect the instrument panel junction block assembly connector.


    NG

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

    OK

  8. SYSTEM CHECK


    1. Check the vehicle specifications.

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

    B

    SYSTEM CHECK Click here

    A

  9. INSPECT CERTIFICATION ECU (SMART KEY ECU ASSEMBLY)


    1. A01VE9VE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      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

    3. Reconnect the instrument panel junction block assembly connector.


    NG

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

    OK

  10. SYSTEM CHECK


    1. Check the vehicle specifications.

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

    B

    INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    C

    INSPECT ECM Click here

    A

  11. INSPECT RADIO RECEIVER ASSEMBLY


    1. A01VE9VE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      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

    NG

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

    OK

  12. INSPECT ECM


    1. A01VKQ5E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      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

    3. Reconnect the instrument panel junction block assembly connector.


    OK

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    NG

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

  13. INSPECT RADIO AND DISPLAY RECEIVER ASSEMBLY


    1. A01VE9VE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      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

    NG

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

    OK

  14. INSPECT ECM


    1. A01VKQ5E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      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

    3. Reconnect the instrument panel junction block assembly connector.


    OK

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    NG

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

  15. INSPECT ECM


    1. A01VKQ5E02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Instrument Panel Junction Block Assembly)

      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

    3. Reconnect the instrument panel junction block assembly connector.


    OK

    REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY Click here

    NG

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

  16. 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

  17. 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

  18. 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)

  19. 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

  20. 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 1NR-FE

      • *2: for 1KR-FE

      • *3: for 1ND-TV without DPF

      • *4: for 1ND-TV with DPF

      Standard Resistance
      for 1NR-FE
      Tester Connection Condition Specified Condition
      3C-39 - A58-44 (SPD) Always Below 1 Ω
      3C-39 - Body ground Always 10 kΩ or higher
      for 1KR-FE
      Tester Connection Condition Specified Condition
      3C-39 - A93-38 (SPD) Always Below 1 Ω
      3C-39 - Body ground Always 10 kΩ or higher
      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
      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
      Result
      Result Proceed to
      NG A
      OK (for 1NR-FE) 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.


    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPLACE ECM Click here

    E

    REPLACE ECM Click here