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

A004O8AE02

PROCEDURE


  1. CHECK ECU TERMINAL VOLTAGE (INPUT VOLTAGE)


    1. A004R9KE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the D66 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
      D66-3 (+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)

    A004NF6E02
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Brake Actuator Assembly [Skid Control ECU])

    1. Disconnect the A42 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
      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. A004UD8E01
      Text in Illustration
      *a

      Component with harness connected

      (Combination Meter Assembly)

      Check the input waveform.


      1. Reconnect the D66 combination meter assembly 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 approximately 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.


    OK

    REPLACE COMBINATION METER ASSEMBLY Click here

    NG

    REPLACE BRAKE ACTUATOR ASSEMBLY Click here

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

    A004S25E02
    Text in Illustration
    *a

    Front view of wire harness connector

    (to Combination Meter Assembly)
    *b

    Front view of wire harness connector

    (to Brake Actuator Assembly [Skid Control ECU])

    1. Disconnect the D66 combination meter assembly connector.

    2. Disconnect the A42 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
      D66-5 (SI) - A42-33 (SP1) Always Below 1 Ω
      A42-33 (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)

    A004UAEE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to No. 3 Junction Block)

    		 *b

    Front view of wire harness connector

    (to Combination Meter Assembly)

    1. Disconnect the D66 combination meter assembly 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

    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".

    A004MNKE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to No. 3 Junction Block)

    		 - -

    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

    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".

    A004R6DE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to No. 3 Junction Block)

    		 - -

    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

    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".

    A004R6DE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to No. 3 Junction Block)

    		 - -

    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

    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 Tire Pressure Monitor Receiver Assembly".

    A004PRHE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to No. 3 Junction Block)

    		 - -

    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

    NG

    CHECK HARNESS AND CONNECTOR (TCM CIRCUIT) Click here

    OK

  10. CHECK TIRE PRESSURE MONITOR RECEIVER ASSEMBLY

    Note

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

    A004N6YE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to No. 3 Junction Block)

    		 - -

    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-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

  11. CHECK ECM

    A004PR6E03
    Text in Illustration
    *a

    Front view of wire harness connector

    (to No. 3 Junction Block)

    		 - -

    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

    OK

    REPLACE NO. 3 JUNCTION BLOCK

    NG

    CHECK HARNESS AND CONNECTOR (ECM CIRCUIT) Click here

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

    A004QDSE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to No. 3 Junction Block)

    		 *b

    Front view of wire harness connector

    (to Power Management Control ECU)

    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

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    A004QE0E01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to No. 3 Junction Block)

    		 *b

    Front view of wire harness connector

    (to Radio Receiver Assembly)

    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

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    A004QRBE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to No. 3 Junction Block)

    		 *b

    Front view of wire harness connector

    (to Radio and Display Receiver Assembly)

    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

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  15. CHECK HARNESS AND CONNECTOR (TCM CIRCUIT)

    A004UACE01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to No. 3 Junction Block)

    		 *b

    Front view of wire harness connector

    (to TCM)

    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

    OK

    REPLACE TCM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    A004SBZE01
    Text in Illustration
    *A for Sedan *B for Wagon
    *a

    Front view of wire harness connector

    (to No. 3 Junction Block)

    		 *b

    Front view of wire harness connector

    (to Tire Pressure Monitor Receiver Assembly)

    1. Disconnect the 3A junction block connector.

    2. Disconnect the G61*1 or L1*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
      G61-2 (SPD) - 3A-44 Always Below 1 Ω
      3A-44 - Body ground Always 10 kΩ or higher
      for Wagon
      Tester Connection Condition Specified Condition
      L1-2 (SPD) - 3A-44 Always Below 1 Ω
      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

  17. CHECK HARNESS AND CONNECTOR (ECM CIRCUIT)

    A004NA9E01
    Text in Illustration
    *a

    Front view of wire harness connector

    (to No. 3 Junction Block)

    		 *b

    Front view of wire harness connector

    (to ECM)

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

    A

    REPLACE ECM Click here

    B

    REPLACE ECM Click here

    C

    REPLACE ECM Click here

    D

    REPAIR OR REPLACE HARNESS OR CONNECTOR