METER / GAUGE SYSTEM Speed Signal Circuit

DESCRIPTION

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

WIRING DIAGRAM

A002O53E04
A002MXDE03

PROCEDURE


  1. CHECK ECU TERMINAL VOLTAGE (INPUT VOLTAGE)


    1. A002P9LE02
      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
      H62-3 (+S) - Body ground Ignition switch ON 4.5 to 14 V

    NG

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

    OK

  2. CHECK COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)

    A002QYEE02
    Text in Illustration
    *A for CVT
    *B for Manual Transaxle
    *a

    Front view of wire harness connector

    (to Brake Actuator Assembly [Skid Control ECU])
    *b

    Front view of wire harness connector

    (to Brake Actuator Assembly [Skid Control ECU])

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


      • *1: for CVT

      • *2: for Manual Transaxle

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

      Standard Voltage
      for CVT
      Tester Connection Switch Condition Specified Condition
      A78-2 (SP1) - Body ground Ignition switch ON 11 to 14 V
      for Manual Transaxle
      Tester Connection Switch Condition Specified Condition
      A79-27 (SP1) - Body ground Ignition switch ON 11 to 14 V

    NG

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

    OK

  3. CHECK COMBINATION METER ASSEMBLY (SPEED SIGNAL)


    1. A002QS1E01
      Text in Illustration
      *a

      Component with harness connected

      (Combination Meter Assembly)

      Check the input waveform.


      1. Reconnect the H62 combination meter assembly connector.

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

      3. Connect an oscilloscope to terminal H62-5 (SI) and body ground.

      4. Turn the ignition switch to ON.

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

        Measurement Condition
        Item Condition
        Terminal No. (Symbol) H62-5 (SI) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition Being driven at approximately 20 km/h (12 mph)
        OK
        The waveform displayed is 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 - BRAKE ACTUATOR ASSEMBLY)

    A002O4UE02

    1. Disconnect the combination meter assembly connector.

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


      • *1: for CVT

      • *2: for Manual Transaxle

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

      Standard Resistance
      for CVT
      Tester Connection Condition Specified Condition
      H62-5 (SI) - A78-2 (SP1) Always Below 1 Ω
      A78-2 (SP1) - Body ground Always 10 kΩ or higher
      for Manual Transaxle
      Tester Connection Condition Specified Condition
      H62-5 (SI) - A79-27 (SP1) Always Below 1 Ω
      A79-27 (SP1) - Body ground Always 10 kΩ or higher
      Text in Illustration
      *A for CVT
      *B for Manual Transaxle
      *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])
      *c

      Front view of wire harness connector

      (to Brake Actuator Assembly [Skid Control ECU])

    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 combination meter assembly connector.

      A002M2UE01
      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)

    2. Disconnect the 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
      H62-3 (+S) - 3A-55 Always Below 1 Ω
      H62-3 (+S) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (w/ Entry and start system, TOYOTA parking assist-sensor system or tire pressure warning system) A
      OK (w/o Entry and start system, TOYOTA parking assist-sensor system and tire pressure warning system) B
      NG C

    B

    CHECK RADIO RECEIVER ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

  6. CHECK POWER MANAGEMENT CONTROL ECU


    1. Disconnect the No. 3 junction block connector.

      A002LTXE01
      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-67 - Body ground Ignition switch ON 4.5 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (NO. 3 JUNCTION BLOCK - NO. 4 JUNCTION BLOCK) Click here

    OK

  7. CHECK RADIO RECEIVER ASSEMBLY

    Note

    For vehicles radio and display type, go to "Check Radio and Display Receiver Assembly".


    1. Disconnect the No. 3 junction block connector.

      A002QCHE01
      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-43 - 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 radio receiver type, go to "Check Headlight Leveling ECU Assembly".


    1. Disconnect the No. 3 junction block connector.

      A002QCHE01
      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-43 - 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 HEADLIGHT LEVELING ECU ASSEMBLY

    Note

    For vehicles without an HID headlight system, go to "Check ECM".


    1. Disconnect the No. 3 junction block connector.

      A002LMNE02
      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-19 - Body ground Ignition switch ON 4.5 to 14 V

    NG

    CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY CIRCUIT) Click here

    OK

  10. CHECK ECM


    1. Disconnect the No. 3 junction block connector.

      A002QBVE02
      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 (NO. 3 JUNCTION BLOCK - NO. 4 JUNCTION BLOCK)


    1. Disconnect the No. 3 junction block connector.

      A002QRJE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 3 Junction Block)

      		 *b

      Front view of wire harness connector

      (to No. 4 Junction Block)

    2. Disconnect the No. 4 junction block connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3B-67 - 4A-61 Always Below 1 Ω
      3B-67 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  12. CHECK NO. 4 JUNCTION BLOCK


    1. Disconnect the No. 4 junction block connectors.

      A002QSFE01
      Text in Illustration
      *A w/ TOYOTA Parking Assist-sensor System *B w/ Entry and Start System
      *C w/ Tire Pressure Warning System - -
      *a

      Front view of wire harness connector

      (to No. 4 Junction Block)

      		 - -

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      4A-13 - Body ground*1 Ignition switch ON 4.5 to 14 V
      4A-85 - Body ground*2 Ignition switch ON 4.5 to 14 V
      4B-61 - Body ground*3 Ignition switch ON 4.5 to 14 V

      • *1: w/ TOYOTA Parking Assist-sensor System

      • *2: w/ Entry and Start System

      • *3: w/ Tire Pressure Warning System

      Result
      Result Proceed to
      NG (4A-85) A
      NG (4A-13) B
      NG (4B-61) C
      OK D

    B

    CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY CIRCUIT) Click here

    C

    CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER CIRCUIT) Click here

    D

    REPLACE NO. 4 JUNCTION BLOCK

    A

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


    1. Disconnect the No. 4 junction block connector.

      A002QCVE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 4 Junction Block)

      		 *b

      Front view of wire harness connector

      (to Power Management Control ECU)

    2. Disconnect the 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
      H71-23 (SPD) - 4A-85 Always Below 1 Ω
      4A-85 - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    B

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Disconnect the No. 3 junction block connector.

      A002QYTE01
      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)

    2. Disconnect the radio receiver assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H114-17 (SPD) - 3A-43 Always Below 1 Ω
      3A-43 - Body ground Always 10 kΩ or higher

    OK

    REPLACE RADIO RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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


    1. Disconnect the No. 3 junction block connector.

      A002NZ6E01
      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)

    2. Disconnect the 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
      H105-17 (SPD) - 3A-43 Always Below 1 Ω
      3A-43 - Body ground Always 10 kΩ or higher

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  16. CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY CIRCUIT)


    1. Disconnect the No. 3 junction block connector.

      A002QB0E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 3 Junction Block)

      		 *b

      Front view of wire harness connector

      (to Headlight Leveling ECU Assembly)

    2. Disconnect the headlight leveling ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A49-16 (SPDR) - 3A-19 Always Below 1 Ω
      3A-19 - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

    B

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  17. CHECK HARNESS AND CONNECTOR (ECM CIRCUIT)


    1. Disconnect the No. 3 junction block connector.

      A002PI5E02
      Text in Illustration
      *A for ZR Series Engine *B for 1WW
      *a

      Front view of wire harness connector

      (to No. 3 Junction Block)

      		 *b

      Front view of wire harness connector

      (to ECM)

    2. Disconnect the ECM connector.

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

      Standard Resistance
      for ZR Series Engine
      Tester Connection Condition Specified Condition
      A76-44 (SPD) - 3A-20 Always Below 1 Ω
      3A-20 - Body ground Always 10 kΩ or higher
      for 1WW
      Tester Connection Condition Specified Condition
      A76-51 (SPD) - 3A-20 Always Below 1 Ω
      3A-20 - Body ground Always 10 kΩ or higher

      Tech Tips

      *: Replacement procedure:



    OK

    REPLACE ECM*

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  18. CHECK HARNESS AND CONNECTOR (CLEARANCE WARNING ECU ASSEMBLY CIRCUIT)


    1. Disconnect the No. 4 junction block connector.

      A002PR6E01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 4 Junction Block)

      		 *b

      Front view of wire harness connector

      (to Clearance Warning ECU Assembly)

    2. Disconnect the clearance warning ECU assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H95-5 (SPD) - 4A-13 Always Below 1 Ω
      4A-13 - Body ground Always 10 kΩ or higher

    OK

    REPLACE CLEARANCE WARNING ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  19. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU AND RECEIVER CIRCUIT)


    1. Disconnect the No. 4 junction block connector.

      A002MHYE01
      Text in Illustration
      *a

      Front view of wire harness connector

      (to No. 4 Junction Block)

      		 *b

      Front view of wire harness connector

      (to Tire Pressure Warning ECU and Receiver)

    2. Disconnect the tire pressure warning ECU and receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      N32-2 (SPD) - 4B-61 Always Below 1 Ω
      4B-61 - Body ground Always 10 kΩ or higher

    OK

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR