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Speed Signal Circuit: Procedure

  1. INSPECT COMBINATION METER ASSEMBLY (INPUT VOLTAGE) 
    1. Disconnect the D18 combination meter assembly connector.
      Fig 1: Inspecting D18 Combination Meter Assembly Connector
      GTY302542Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      D18-10 (+S) - Body ground Ignition switch ON 4.5 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Combination Meter Assembly)

      HINT: 

      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 → See step   5 

    OK: Go to next step 

  2. INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE) 
    1. Disconnect the A4 brake actuator assembly connector.
      Fig 2: A4 Brake Actuator Assembly Connector End View
      GTY304323Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Switch Condition Specified Condition
      A4-11 (SP1) - Body ground Ignition switch ON 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Brake Actuator Assembly)

    NG → See step   4 

    OK: Go to next step 

  3. INSPECT BRAKE ACTUATOR ASSEMBLY (INPUT WAVEFORM) 
    1. Check the input waveform.
      Fig 3: Inspecting D18 Combination Meter Assembly Connector With Waveform
      GTY301241Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Remove the combination meter assembly with the connector(s) still connected.
      2. Connect an oscilloscope to terminal D18-11 (SI) and body ground.
      3. Turn the ignition switch to ON.
      4. Turn the wheel slowly.
      5. Check the signal waveform according to the condition(s) in the table below.
        Item Condition
        Tool setting 5 V/DIV., 20 ms./DIV.
        Condition Driving at approx. 20 km/h (12 mph)

        OK

        The waveform is displayed as shown in the illustration above.

        HINT: 

        As the vehicle speed increases, the cycle of the waveform narrows.

        TEXT IN ILLUSTRATION

        *a Component with harness connected
        (Combination Meter Assembly)

    NG → See step   20 

    OK → See step   19 

  4. CHECK HARNESS AND CONNECTOR (BRAKE ACTUATOR ASSEMBLY - COMBINATION METER ASSEMBLY) 
    1. Disconnect the A4 brake actuator assembly connector.
    2. Disconnect the D18 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A4-11 (SP1) - D18-11 (SI) Always Below 1 Ω
      A4-11 (SP1) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   19 

  5. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Disconnect the D18 combination meter assembly connector.
    2. Disconnect the 2A instrument panel junction block assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D18-10 (+S) - 2A-30 Always Below 1 Ω
      D18-10 (+S) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  6. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) 
    1. Inspect for a short in the circuit that is connected to the instrument panel junction block assembly connector shown in the wiring diagram.

      HINT: 

      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 2A and 2F instrument panel junction block assembly connectors.
        Fig 4: 2A And 2F Instrument Panel Junction Block Assembly Connector End View
        GTY299969Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Switch Condition Specified Condition
        2F-19 - Body ground Ignition switch ON 4.5 to 14 V
        2F-34 - Body ground Ignition switch ON 4.5 to 14 V
        2A-29 - Body ground Ignition switch ON 4.5 to 14 V
        2A-28 - Body ground Ignition switch ON 4.5 to 14 V
        TEXT IN ILLUSTRATION

        *a Front view of wire harness connector
        (to Instrument Panel Junction Block Assembly)
        RESULT

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

    B → REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY 

    A: Go to next step 

  7. SYSTEM CHECK 
    1. Select the circuit for which voltage was not as specified in the previous step 6.
      RESULT

      Tester Connection System that Uses the Circuit Proceed to
      2F-19 - Body ground Automatic transaxle system A
      2F-34 - Body ground SFI system B
      2A-29 - Body ground Tire pressure warning system C
      2A-28 - Body ground Smart key system*1, wiper and washer system*2, separate type amplifier system*3, safety connect system*4, navigation system*5, audio and visual system*6 D
      • *1: w/ Smart Key System
      • *2: w/ Rain Sensor
      • *3: for Separate Type Amplifier System
      • *4: w/ Safety Connect System
      • *5: w/ Navigation System
      • *6: w/o Navigation System

    B → See step   9 

    C → See step   10 

    D → See step   11 

    A: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - TCM) 
    1. Disconnect the 2F instrument panel junction block assembly connector.
    2. Disconnect the B2 TCM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2F-19 - B2-3 (SPD) Always Below 1 Ω
      2F-19 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   21 

  9. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - ECM) 
    1. Disconnect the 2F instrument panel junction block assembly connector.
    2. Disconnect the A39 or A55 ECM connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      FOR 2GR-FE

      Tester Connection Condition Specified Condition
      2F-34 - A39-13 (SPD) Always Below 1 Ω
      2F-34 - Body ground Always 10 kΩ or higher
      FOR 1AR-FE

      Tester Connection Condition Specified Condition
      2F-34 - A55-15 (SPD) Always Below 1 Ω
      2F-34 - Body ground Always 10 kΩ or higher
      RESULT

      Result Proceed to
      NG A
      OK (for 2GR-FE) B
      OK (for 1AR-FE) C

    B → See step   22 

    C → See step   30 

    A → REPAIR OR REPLACE HARNESS OR CONNECTOR 

  10. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - TIRE PRESSURE WARNING ECU) 
    1. Disconnect the 2A instrument panel junction block assembly connector.
    2. Disconnect the D82 tire pressure warning ECU connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2A-29 - D82-2 (SPD) Always Below 1 Ω
      2A-29 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   23 

  11. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - JUNCTION CONNECTOR) 
    1. Disconnect the 2A instrument panel junction block assembly connector.
    2. Disconnect the D107 junction connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      2A-28 - D107-21 Always Below 1 Ω
      2A-28 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  12. 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. Disconnect the D107 junction connector.
        Fig 5: D107 Junction Connector End View
        GTY302318Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Measure the voltage according to the value(s) in the table below

        Standard Voltage

        Tester Connection Switch Condition Specified Condition
        D107-18 - Body ground*1 Ignition switch ON 4.5 to 14 V
        D107-20 - Body ground*2 Ignition switch ON 4.5 to 14 V
        D107-22 - Body ground*3 Ignition switch ON 4.5 to 14 V
        D107-16 - Body ground*4 Ignition switch ON 4.5 to 14 V
        D107-19 - Body ground Ignition switch ON 4.5 to 14 V
        • *1: w/ Smart Key System
        • *2: w/ Rain Sensor
        • *3: for Separate Type Amplifier System
        • *4: w/ Safety Connect System
        TEXT IN ILLUSTRATION

        *a Front view of wire harness connector
        (to Junction Connector)
        RESULT

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

    B → REPLACE JUNCTION CONNECTOR 

    A: Go to next step 

  13. SYSTEM CHECK 
    1. Select the circuit for which voltage was not as specified in the previous step 12.
      RESULT

      Tester Connection System that Uses the Circuit Proceed to
      D107-18 - Body ground*1 Smart key system A
      D107-20 - Body ground*2 Wiper and washer system B
      D107-22 - Body ground*3 Separate Type Amplifier System C
      D107-16 - Body ground*4 Safety connect system D
      D107-19 - Body ground Navigation system*5, audio and visual system*6 E
      • *1: w/ Smart Key System
      • *2: w/ Rain Sensor
      • *3: for Separate Type Amplifier System
      • *4: w/ Safety Connect System
      • *5: w/ Navigation System
      • *6: w/o Navigation System

    B → See step   15 

    C → See step   16 

    D → See step   17 

    E → See step   18 

    A: Go to next step 

  14. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR - POWER MANAGEMENT CONTROL ECU) 
    1. Disconnect the D107 junction connector.
    2. Disconnect the D89 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
      D107-18 - D89-23 (SPD) Always Below 1 Ω
      D107-18 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   24 

  15. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR - WINDSHIELD WIPER RELAY ASSEMBLY) 
    1. Disconnect the D107 junction connector.
    2. Disconnect the D78 windshield wiper relay assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D107-20 - D78-19 (SPD) Always Below 1 Ω
      D107-20 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   25 

  16. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR - STEREO COMPONENT AMPLIFIER ASSEMBLY) 
    1. Disconnect the D107 junction connector.
    2. Disconnect the L5 stereo component amplifier assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D107-22 - L5-11 (SPD) Always Below 1 Ω
      D107-22 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   26 

  17. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR - TELEMATICS TRANSCEIVER) 
    1. Disconnect the D107 junction connector.
    2. Disconnect the D73 telematics transceiver connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      D107-16 - D73-10 (SPDP) Always Below 1 Ω
      D107-16 - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   27 

  18. CHECK HARNESS AND CONNECTOR (JUNCTION CONNECTOR - NAVIGATION RECEIVER OR RADIO RECEIVER) 
    1. w/ Navigation System
      1. Disconnect the D107 junction connector.
      2. Disconnect the D55 navigation receiver assembly connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        D107-19 - D55-3 (SPD) Always Below 1 Ω
        D107-19 - Body ground Always 10 kΩ or higher
    2. w/o Navigation System
      1. Disconnect the D107 junction connector.
      2. Disconnect the D63 radio receiver assembly connector.
      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance

        Tester Connection Condition Specified Condition
        D107-19 - D63-3 (SPD) Always Below 1 Ω
        D107-19 - Body ground Always 10 kΩ or higher
      RESULT

      Result Proceed to
      NG A
      OK (w/ Navigation System) B
      OK (w/o Navigation System) C

    B → See step   28 

    C → See step   29 

    A → REPAIR OR REPLACE HARNESS OR CONNECTOR 

  19. REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL 
  20. REPLACE BRAKE ACTUATOR ASSEMBLY. Refer to  REMOVAL 
  21. REPLACE TCM. Refer to  U660E - REMOVAL  or  U660F - REMOVAL  or  U760E - REMOVAL  . 
  22. REPLACE ECM (for 2GR-FE). Refer to  REMOVAL 
  23. REPLACE TIRE PRESSURE WARNING ECU. Refer to  REMOVAL 
  24. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to  REMOVAL 
  25. REPLACE WINDSHIELD WIPER RELAY ASSEMBLY. Refer to  REMOVAL 
  26. REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to  REMOVAL 
  27. REPLACE TELEMATICS TRANSCEIVER. Refer to  REMOVAL 
  28. REPLACE NAVIGATION RECEIVER ASSEMBLY. Refer to  REMOVAL 
  29. REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL 
  30. REPLACE ECM (for 1AR-FE). Refer to  REMOVAL 
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