METER / GAUGE SYSTEM Speed Signal Circuit

DESCRIPTION

The vehicle speed signal consists of pulses sent to the combination meter assembly from the master cylinder solenoid or brake actuator assembly (skid control ECU).

WIRING DIAGRAM

A01DQQ1E05
A01DTZ4E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK ECU TERMINAL VOLTAGE (INPUT VOLTAGE)


    1. A01DMVNE15
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Combination Meter Assembly)

      Disconnect the G6 meter connector.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      G6-32 (+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)


    1. for 1GR-FE, 1KD-FTV:


      1. Disconnect the A7 master cylinder solenoid (skid control ECU) connector.

      2. A01DRREE01
        Text in Illustration
        *a

        Front view of wire harness connector

        (to Master Cylinder Solenoid (Skid Control ECU))

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        A7-12 (SP1) - Body ground Ignition switch ON 11 to 14 V

    2. for 2TR-FE, 5L-E:


      1. Disconnect the A6 brake actuator assembly (skid control ECU) connector.

      2. A01DOVEE01
        Text in Illustration
        *a

        Front view of wire harness connector

        (to Brake Actuator Assembly (Skid Control ECU))

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        A6-11 (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. A01DU0ZE02

      Check the input waveform.


      1. Reconnect the G6 meter connector.

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

      3. Connect an oscilloscope to terminal G6-33 (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) G6-33 (SI) - Body ground
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition Driving 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.

        Result
        Result Proceed to
        OK A
        NG (for LHD, w/ Hydraulic Brake Booster) B
        NG (for RHD, w/ Hydraulic Brake Booster) C
        NG (w/ Vacuum Brake Booster) D

    B

    REPLACE MASTER CYLINDER SOLENOID (SKID CONTROL ECU)(for LHD) Click here

    C

    REPLACE MASTER CYLINDER SOLENOID (SKID CONTROL ECU)(for RHD) Click here

    D

    REPLACE BRAKE ACTUATOR ASSEMBLY (SKID CONTROL ECU) Click here

    A

    REPLACE COMBINATION METER ASSEMBLY Click here

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


    1. for 1GR-FE, 1KD-FTV:


      1. Disconnect the G6 meter connector.

      2. Disconnect the A7 master cylinder solenoid (skid control ECU) connector.

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

        Standard Resistance
        Tester Connection Condition Specified Condition
        G6-33 (SI) - A7-12 (SP1) Always Below 1 Ω
        A7-12 (SP1) - Body ground Always 10 kΩ or higher

    2. for 2TR-FE, 5L-E:


      1. Disconnect the G6 meter connector.

      2. Disconnect the A6 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
        G6-33 (SI) - A6-11 (SP1) Always Below 1 Ω
        A6-11 (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)


    1. Disconnect the G6 meter connector.

    2. Disconnect the 3A junction block connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G6-32 (+S) - 3A-59 Always Below 1 Ω
      G6-32 (+S) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. CHECK HARNESS AND CONNECTOR (NO. 3 JUNCTION BLOCK)


    1. Inspect for a short in the circuit that is connected to the junction block connector shown in the wiring diagram.

      Tech Tips

      If the voltage is not as specified, it is possible that an ECU or circuit has a malfunction. The malfunctioning ECU or circuit will be diagnosed in the following steps.


      1. Disconnect the 3B junction block connector.

        A01DM1XE06
        Text in Illustration
        *1 No. 3 Junction Block - -
        *a

        Front view of wire harness connector

        (to No. 3 Junction Block)

        		 - -

      2. Disconnect the 3C junction block connector.

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

        Standard Voltage
        Tester Connection Condition Specified Condition
        3C-24 - Body ground*1 Ignition switch ON 4.5 to 14 V
        3B-72 - Body ground*2 Ignition switch ON 4.5 to 14 V
        3A-22 - Body ground*3 Ignition switch ON 4.5 to 14 V
        3A-60 - Body ground Ignition switch ON 4.5 to 14 V
        3A-35 - Body ground*4 Ignition switch ON 4.5 to 14 V

        • *1: w/ Auto Wiper System

        • *2: w/ Entry and Start System

        • *3: w/ Audio and Visual System or Navigation System

        • *4: w/ Tire Pressure Monitor System

        Result
        Result Proceed to
        Voltage is not as specified in one circuit A
        Voltage is as specified in all circuits B

    B

    REPLACE NO. 3 JUNCTION BLOCK

    A

  7. SYSTEM CHECK


    1. Select the circuit for which voltage was not as specified in the previous step.

      Result
      Tester Connection System that Uses the Circuit Proceed to
      3C-24 - Body ground Auto wiper system*1 A
      3B-72 - Body ground Entry and start system*2 B
      3A-22 - Body ground Audio and visual system*3 or navigation system*4 C
      3A-60 - Body ground SFI system, TOYOTA parking assist-sensor system*5, automatic transmission system*6*7 D
      3A-35 - Body ground Tire pressure monitor system*8 E

      • *1: w/ Auto Wiper System

      • *2: w/ Entry and Start System

      • *3: w/o Navigation System

      • *4: w/ Navigation System

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

      • *6: for 1KD-FTV

      • *7: for Automatic Transmission

      • *8: w/ Tire Pressure Monitor System


    B

    CHECK HARNESS AND CONNECTOR (NO. 3 JUNCTION BLOCK - POWER MANAGEMENT CONTROL ECU) Click here

    C

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

    D

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

    E

    CHECK HARNESS AND CONNECTOR (NO. 3 JUNCTION BLOCK - TIRE PRESSURE MONITOR RECEIVER ASSEMBLY) Click here

    A

  8. CHECK HARNESS AND CONNECTOR (NO. 3 JUNCTION BLOCK - WINDSHIELD WIPER SWITCH ASSEMBLY)


    1. Disconnect the G120 auto wiper switch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G120-6 (SPD) - Body ground*1 Always 10 kΩ or higher
      G120-4 (SPD) - Body ground*2, *3 Always 10 kΩ or higher

      • *1: for LHD

      • *2: for RHD

      • *3: for Headlight Dimmer Switch Assembly RH Side Type


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY Click here

  9. CHECK HARNESS AND CONNECTOR (NO. 3 JUNCTION BLOCK - POWER MANAGEMENT CONTROL ECU)


    1. Disconnect the G51 power management control ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G51-23 (SPD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE POWER MANAGEMENT CONTROL ECU Click here

  10. CHECK HARNESS AND CONNECTOR (NO. 3 JUNCTION BLOCK - JUNCTION CONNECTOR)


    1. Disconnect the 3A junction block connector.

    2. Disconnect the H24 junction connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-22 - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  11. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR)


    1. Inspect for a short in the circuit that is connected to the junction connector shown in the wiring diagram.


      1. A01DMQXE02
        Text in Illustration
        *a

        Front view of wire harness connector

        (Junction Connector)

        Disconnect the H25 junction block connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        H25-10 - Body ground*1 Ignition switch ON 4.5 to 14 V
        H25-11 - Body ground*2 Ignition switch ON 4.5 to 14 V

        • *1: w/ Radio Receiver Assembly or Navigation System

        • *2: w/ Stereo Component Amplifier

        Result
        Result Proceed to
        NG (H25-10 - Body ground) A
        NG (H25-11 - Body ground) B
        OK C

    B

    CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR - STEREO COMPONENT AMPLIFIER ASSEMBLY) Click here

    C

    REPLACE JUNCTION CONNECTOR

    A

  12. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR - RADIO AND DISPLAY RECEIVER ASSEMBLY)

    Note

    For vehicles with a navigation system, go to "Check Navigation Receiver Assembly".


    1. Disconnect the H51 radio and display receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H51-17 (SPD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY Click here

  13. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR - NAVIGATION RECEIVER ASSEMBLY)


    1. Disconnect the H56 navigation receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H56-17 (SPD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE NAVIGATION RECEIVER ASSEMBLY Click here

  14. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR - STEREO COMPONENT AMPLIFIER ASSEMBLY)


    1. Disconnect the H63 stereo component amplifier connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      H63-11 (SPD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY Click here

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


    1. Disconnect the 3A junction block connector.

    2. Disconnect the 4A junction block connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3A-60 (+S) - 4A-48 Always Below 1 Ω
      3A-60 (+S) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  16. CHECK HARNESS AND CONNECTOR (NO. 4 JUNCTION BLOCK)


    1. Inspect for a short in the circuit that is connected to the junction connector shown in the wiring diagram.


      1. Disconnect the 4A junction block connector.

      2. Disconnect the 4B junction block connector.

        A01DUS1E02
        Text in Illustration
        *1 No. 4 Junction Block - -
        *a

        Front view of wire harness connector

        (to No. 4 Junction Block)

        		 - -

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        4B-49 - Body ground*1 Ignition switch ON 4.5 to 14 V
        4B-1 - Body ground*2, *3 Ignition switch ON 4.5 to 14 V
        4A-96 - Body ground Ignition switch ON 4.5 to 14 V

        • *1: TOYOTA Parking Assist-sensor System

        • *2: for 1KD-FTV

        • *3: for Automatic Transmission

        Result
        Result Proceed to
        NG (4B-49 - Body ground) A
        NG (4B-1 - Body ground) B
        NG (4A-96 - Body ground) C
        OK D

    B

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

    C

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

    D

    REPLACE NO. 4 JUNCTION BLOCK

    A

  17. CHECK HARNESS AND CONNECTOR (NO. 4 JUNCTION BLOCK - CLEARANCE WARNING ECU)


    1. Disconnect the I1 clearance warning ECU connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I1-10 (SPD) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      NG A
      OK (for LHD) B
      OK (for RHD) C

    B

    REPLACE CLEARANCE WARNING ECU ASSEMBLY (for LHD) Click here

    C

    REPLACE CLEARANCE WARNING ECU ASSEMBLY (for RHD) Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  18. CHECK HARNESS AND CONNECTOR (NO. 4 JUNCTION BLOCK - TCM)


    1. Disconnect the G70 TCM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G70-25 (SPD1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE TCM Click here

  19. CHECK HARNESS AND CONNECTOR (NO. 4 JUNCTION BLOCK - ECM)


    1. for 1GR-FE:

      Disconnect the G55 ECM connector.

    2. for 2TR-FE:

      Disconnect the G60 ECM connector.

    3. for 1KD-FTV:

      Disconnect the G58 ECM connector.

    4. for 5L-E:

      Disconnect the G61 ECM connector.

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

      Standard Resistance
      for 1GR-FE
      Tester Connection Condition Specified Condition
      G55-18 (SPD) - Body ground Always 10 kΩ or higher
      G55-18 (SPD) - 4A-96 Always Below 1 Ω
      for 2TR-FE
      Tester Connection Condition Specified Condition
      G60-16 (SPD) - Body ground Always 10 kΩ or higher
      G60-16 (SPD) - 4A-96 Always Below 1 Ω
      for 1KD-FTV
      Tester Connection Condition Specified Condition
      G58-30 (SPD) - Body ground Always 10 kΩ or higher
      G58-30 (SPD) - 4A-96 Always Below 1 Ω
      for 5L-E
      Tester Connection Condition Specified Condition
      G61-9 (SPD) - Body ground Always 10 kΩ or higher
      G61-9 - 4A-96 Always Below 1 Ω
      Result
      Result Proceed to
      NG A
      OK (for 1GR-FE) B
      OK (for 2TR-FE) C
      OK (for 1KD-FTV) D
      OK (for 5L-E) E

    B

    REPLACE ECM (for 1GR-FE) Click here

    C

    REPLACE ECM (for 2TR-FE) Click here

    D

    REPLACE ECM (for 1KD-FTV) Click here

    E

    REPLACE ECM (for 5L-E) Click here

    A

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  20. CHECK HARNESS AND CONNECTOR (NO. 3 JUNCTION BLOCK - TIRE PRESSURE MONITOR RECEIVER ASSEMBLY)


    1. Disconnect the R41 tire pressure monitor receiver connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      R41-2 (SPD) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE TIRE PRESSURE MONITOR RECEIVER ASSEMBLY Click here