METER / GAUGE SYSTEM Speed Signal Circuit

DESCRIPTION

The vehicle speed sensor signal consists of pulses sent to the combination meter assembly from the skid control ECU.

WIRING DIAGRAM

A00ORDYE02

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK ECU TERMINAL VOLTAGE (INPUT VOLTAGE)


    1. A00OTMTE02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the D66 meter connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      D66-3 (+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.


    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - NO. 3 JUNCTION BLOCK) Click here

    OK

  2. CHECK COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)

    A00OQRRE01
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Brake Actuator Assembly)

    1. Disconnect the A42 brake actuator connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A42-33 (SP1) - Body ground Ignition switch ON 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - SKID CONTROL ECU) Click here

    OK

  3. CHECK COMBINATION METER ASSEMBLY (SPEED SIGNAL)


    1. A00OUKUE01
      Text in Illustration
      *1

      Component with harness connected

      (Combination Meter Assembly)

      Check the input waveform.


      1. Reconnect the D66 meter connector.

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

      3. Connect an oscilloscope to terminal D66-5 (SI) and body ground.

      4. Turn the ignition switch to ON.

      5. Turn the wheel slowly.

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

        Measurement Condition
        Item Condition
        Terminal No. (Symbol) D66-5 (SI) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition Being driven at approx. 20 km/h (12 mph)
        OK
        The waveform is displayed as shown in the illustration.

        Tech Tips

        When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width indicated by (A) in the illustration narrows.


    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - SKID CONTROL ECU)

    A00OSN9E01
    Text in Illustration
    *1

    Front view of wire harness connector

    (to Combination Meter Assembly)
    *2

    Front view of wire harness connector

    (to Brake Actuator Assembly)

    1. Disconnect the D66 meter connector.

    2. Disconnect the A42 brake actuator connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D66-5 (SI) - A42-33 (SP1) Always Below 1 Ω
      A42-33 (SP1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

  5. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - NO. 3 JUNCTION BLOCK)

    A00OT9SE01

    1. Disconnect the D66 meter connector.

    2. Disconnect the 3B junction block connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D66-3 (+S) - 3B-18 Always Below 1 Ω
      D66-3 (+S) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 3 Junction Block)

      		 *2

      Front view of wire harness connector

      (to Combination Meter Assembly)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK POWER MANAGEMENT CONTROL ECU

    Note

    For vehicles without power management control ECU, go to "Check Radio Receiver Assembly".

    A00OSVBE01

    1. Disconnect the 3B junction block connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3B-7 - Body ground Ignition switch ON 4.5 to 14 V
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 3 Junction Block)

    NG

    CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU CIRCUIT) Click here

    OK

  7. CHECK RADIO RECEIVER ASSEMBLY

    Note

    For vehicles without radio receiver assembly, go to "Check Radio and Display Receiver Assembly".

    A00OVLQE01

    1. Disconnect the 3A junction block connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3A-21 - Body ground Ignition switch ON 4.5 to 14 V
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 3 Junction Block)

    NG

    CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY CIRCUIT) Click here

    OK

  8. CHECK RADIO AND DISPLAY RECEIVER ASSEMBLY

    Note

    For vehicles without radio and display receiver assembly, go to "Check TCM".

    A00OVLQE01

    1. Disconnect the 3A junction block connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3A-21 - Body ground Ignition switch ON 4.5 to 14 V
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 3 Junction Block)

    NG

    CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY CIRCUIT) Click here

    OK

  9. CHECK TCM

    Note

    For vehicles equipped with a manual transaxle, go to "Check ECM".

    A00OSVBE03

    1. Disconnect the 3B junction block connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3B-19 - Body ground Ignition switch ON 4.5 to 14 V
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 3 Junction Block)

    NG

    CHECK HARNESS AND CONNECTOR (TCM CIRCUIT) Click here

    OK

  10. CHECK ECM

    A00OVLQE03

    1. Disconnect the 3A junction block connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3A-20 - Body ground Ignition switch ON 4.5 to 14 V
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 3 Junction Block)

    NG

    CHECK HARNESS AND CONNECTOR (ECM CIRCUIT) Click here

    OK

    REPLACE NO. 3 JUNCTION BLOCK

  11. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU CIRCUIT)

    A00OUIGE03

    1. Disconnect the 3B junction block connector.

    2. Disconnect the D111 power management connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D111-23 (SPD) - 3B-7 Always Below 1 Ω
      3B-7 - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 3 Junction Block)

      		 *2

      Front view of wire harness connector

      (to Power Management Control ECU)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  12. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY CIRCUIT)

    A00OV01E04

    1. Disconnect the 3A junction block connector.

    2. Disconnect the D129 radio receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D129-17 (SPD) - 3A-21 Always Below 1 Ω
      3A-21 - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 3 Junction Block)

      		 *2

      Front view of wire harness connector

      (to Radio Receiver Assembly)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here

  13. CHECK HARNESS AND CONNECTOR (RADIO AND DISPLAY RECEIVER ASSEMBLY CIRCUIT)

    A00OV01E05

    1. Disconnect the 3A junction block connector.

    2. Disconnect the D124 radio and display receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D124-17 (SPD) - 3A-21 Always Below 1 Ω
      3A-21 - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 3 Junction Block)

      		 *2

      Front view of wire harness connector

      (to Navigation Receiver Assembly)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

  14. CHECK HARNESS AND CONNECTOR (TCM CIRCUIT)

    A00OTKPE01

    1. Disconnect the 3B junction block connector.

    2. Disconnect the B77 TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      B77-3 (SPD) - 3B-19 Always Below 1 Ω
      3B-19 - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 3 Junction Block)

      		 *2

      Front view of wire harness connector

      (to TCM)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE TCM Click here

  15. CHECK HARNESS AND CONNECTOR (ECM CIRCUIT)

    A00OUCPE05

    1. Disconnect the 3A junction block connector.

    2. Disconnect the A40 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A40-38 (SPD) - 3A-20 Always Below 1 Ω
      3A-20 - Body ground Always 10 kΩ or higher
      Text in Illustration
      *1

      Front view of wire harness connector

      (to No. 3 Junction Block)

      		 *2

      Front view of wire harness connector

      (to ECM)
      Result
      Result Proceed to
      OK (for 1AD-FTV) A
      OK (for 2AD-FHV) B
      OK (for 2AD-FTV) C
      NG D

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    REPLACE ECM Click here