METER / GAUGE SYSTEM Speed Signal Circuit

DTC Code DTC Name
Speed Signal Circuit

DESCRIPTION

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

WIRING DIAGRAM

E314744E04
E293662E03

PROCEDURE

  1. CHECK ECU TERMINAL VOLTAGE (INPUT VOLTAGE)

    1. U123773E02

      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
      Table 1. Text in Illustration

      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

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

  2. CHECK COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE)

    U124139E02

    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

      Table 2. for CVT

      Tester Connection

      Switch Condition

      Specified Condition

      A78-2 (SP1) - Body ground

      Ignition switch ON

      11 to 14 V
      Table 3. for Manual Transaxle

      Tester Connection

      Switch Condition

      Specified Condition

      A79-27 (SP1) - Body ground

      Ignition switch ON

      11 to 14 V
      Table 4. 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])

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

  3. CHECK COMBINATION METER ASSEMBLY (SPEED SIGNAL)

    1. U124134E01

      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.

        Table 5. 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.

        Table 6. Text in Illustration

        *a

        Component with harness connected

        (Combination Meter Assembly)
        Tip:

        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.

    REPLACE COMBINATION METER ASSEMBLY

    (Click here)

    REPLACE BRAKE ACTUATOR ASSEMBLY

    (Click here)

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - BRAKE ACTUATOR ASSEMBLY)

    U124140E02

    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

      Table 7. 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
      Table 8. 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
      Table 9. 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])

    REPLACE COMBINATION METER ASSEMBLY

    (Click here)

    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.

      U123909E01
      Table 10. 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
      Table 11. 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

    CHECK RADIO RECEIVER ASSEMBLYClick here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  6. CHECK POWER MANAGEMENT CONTROL ECU

    1. Disconnect the No. 3 junction block connector.

      U123710E01
      Table 12. 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

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

  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.

      U123794E01
      Table 13. 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

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

  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.

      U123794E01
      Table 14. 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

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

  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.

      U123795E02
      Table 15. 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

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

  10. CHECK ECM

    1. Disconnect the No. 3 junction block connector.

      U123797E02
      Table 16. 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

    REPLACE NO. 3 JUNCTION BLOCK

    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.

      U123975E02
      Table 17. 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

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  12. CHECK NO. 4 JUNCTION BLOCK

    1. Disconnect the No. 4 junction block connectors.

      U124130E01
      Table 18. 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

      Table 19. Result

      Result

      Proceed to

      NG (4A-85)

      A

      NG (4A-13)

      B

      NG (4B-61)

      C

      OK

      D

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

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

    REPLACE NO. 4 JUNCTION BLOCK

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

    1. Disconnect the No. 4 junction block connector.

      U123946E01
      Table 20. 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
      Table 21. Result

      Result

      Proceed to

      OK (for LHD)

      A

      OK (for RHD)

      B

      NG

      C

    REPLACE POWER MANAGEMENT CONTROL ECU

    (Click here)

    REPLACE POWER MANAGEMENT CONTROL ECU

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    1. Disconnect the No. 3 junction block connector.

      U124018E01
      Table 22. 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

    REPLACE RADIO RECEIVER ASSEMBLY

    (Click here)

    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.

      U124019E01
      Table 23. 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

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    1. Disconnect the No. 3 junction block connector.

      U123911E01
      Table 24. 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
      Table 25. Result

      Result

      Proceed to

      OK (for LHD)

      A

      OK (for RHD)

      B

      NG

      C

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY

    (Click here)

    REPLACE HEADLIGHT LEVELING ECU ASSEMBLY

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  17. CHECK HARNESS AND CONNECTOR (ECM CIRCUIT)

    1. Disconnect the No. 3 junction block connector.

      U184809E02
      Table 26. 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

      Table 27. 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
      Table 28. 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
    Tip:

    *: Replacement procedure:

    REPLACE ECM*

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    1. Disconnect the No. 4 junction block connector.

      U123973E01
      Table 29. 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

    REPLACE CLEARANCE WARNING ECU ASSEMBLY

    (Click here)

    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.

      U124129E01
      Table 30. 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

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER

    (Click here)

    REPAIR OR REPLACE HARNESS OR CONNECTOR