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

A004OQJE02

PROCEDURE


  1. CHECK ECU TERMINAL VOLTAGE (INPUT VOLTAGE)


    1. A004PEJE01
      Text in Illustration
      *a

      Rear 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
      D66-6 (+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.


    NG

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

    OK

  2. CHECK COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)


    1. A004SFXE01
      Text in Illustration
      *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
      A84-27 (SP1) - Body ground Ignition switch ON 11 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY [SKID CONTROL ECU]) Click here

    OK

  3. CHECK COMBINATION METER ASSEMBLY (SPEED SIGNAL)


    1. A004PMME02
      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 Click here.

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

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

        Measurement Condition
        Item Condition
        Tester Connection D66-5 (SI) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition Driving at approximately 20 km/h (12 mph)

        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.

        OK
        The waveform displayed is as shown in the illustration.

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY [SKID CONTROL ECU])


    1. Disconnect the D66 combination meter assembly connector.

    2. Disconnect the A84 brake actuator assembly (skid control ECU) connectors.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D66-5 (SI) - A84-27 (SP1) Always Below 1 Ω
      D66-5 (SI) or A84-27 (SP1) - Body ground Always 10 kΩ or higher

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Disconnect the D66 combination meter assembly connector.

    2. Disconnect the 3B No. 3 junction block connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      D66-6 (+S) - 3B-18 Always Below 1 Ω
      D66-6 (+S) or 3B-18 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK POWER MANAGEMENT CONTROL ECU

    Note

    For vehicles without entry and start system, go to "Check Radio Receiver Assembly".


    1. Disconnect the No. 3 junction block connector.

      A004P0YE03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 3 Junction Block)

      		 - -

    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

    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".


    1. Disconnect the No. 3 junction block connector.

      A004NX1E03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 3 Junction Block)

      		 - -

    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

    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 Tire Pressure Monitor Receiver Assembly".


    1. Disconnect the No. 3 junction block connector.

      A004NX1E03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 3 Junction Block)

      		 - -

    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

    NG

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

    OK

  9. CHECK TIRE PRESSURE MONITOR RECEIVER ASSEMBLY

    Note

    For vehicles without tire pressure warning system, go to "Check ECM".


    1. Disconnect the No. 3 junction block connector.

      A004NX1E03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 3 Junction Block)

      		 - -

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      3A-44 - Body ground Ignition switch ON 4.5 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR RECEIVER ASSEMBLY CIRCUIT) Click here

    OK

  10. CHECK ECM


    1. Disconnect the No. 3 junction block connector.

      A004NX1E03
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 3 Junction Block)

      		 - -

    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

    OK

    REPLACE NO. 3 JUNCTION BLOCK

    NG

    CHECK HARNESS AND CONNECTOR (ECM CIRCUIT) Click here

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


    1. Disconnect the 3B No. 3 junction block connector.

    2. Disconnect the D111 power management control ECU 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
      D111-23 (SPD) or 3B-7 - Body ground Always 10 kΩ or higher

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Disconnect the 3A No. 3 junction block connector.

    2. Disconnect the D129 radio receiver assembly 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
      D129-17 (SPD) or 3A-21 - Body ground Always 10 kΩ or higher

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Disconnect the 3A No. 3 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
      D124-17 (SPD) - 3A-21 - Body ground Always 10 kΩ or higher

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  14. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE MONITOR RECEIVER ASSEMBLY CIRCUIT)


    1. Disconnect the 3A junction block connector.

    2. Disconnect the G65*1 or L2*2 tire pressure monitor receiver assembly connector.


      • *1: for Sedan

      • *2: for Wagon

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

      Standard Resistance
      for Sedan
      Tester Connection Condition Specified Condition
      G65-2 (SPD) - 3A-44 Always Below 1 Ω
      G65-2 (SPD) or 3A-44 - Body ground Always 10 kΩ or higher
      for Wagon
      Tester Connection Condition Specified Condition
      L2-2 (SPD) - 3A-44 Always Below 1 Ω
      L2-2 (SPD) or 3A-44 - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for Sedan) A
      OK (for Wagon) B
      NG C

    A

    REPLACE TIRE PRESSURE MONITOR RECEIVER ASSEMBLY Click here

    B

    REPLACE TIRE PRESSURE MONITOR RECEIVER ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  15. CHECK HARNESS AND CONNECTOR (ECM CIRCUIT)


    1. Disconnect the 3A No. 3 junction block connector.

    2. Disconnect the A83 ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A83-51 (SPD) - 3A-20 Always Below 1 Ω
      A83-51 (SPD) or 3A-20 - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for 1WW) A
      OK (for 2WW) B
      NG C

    A

    REPLACE ECM Click here

    B

    REPLACE ECM Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR