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Speed Signal Circuit: Procedure

  1. INSPECT ECU TERMINAL VOLTAGE (INPUT VOLTAGE) 
    1. Disconnect the H19 connector.
      Fig 1: Identifying H19 Connector Terminal
      GTY358249Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      H19-40 (+S) - Body ground Power switch on (IG) 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. Reconnect the H19 connector.
    2. Disconnect the A61 connector.
      Fig 2: Identifying H19 Connector Terminals
      GTY349239Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage

      Tester Connection Condition Specified Condition
      A61-11 (SP1) - Body ground Power switch on (IG) 11 to 14 V
      TEXT IN ILLUSTRATION

      *a Front view of wire harness connector
      (to Skid Control ECU)

    NG → See step   4 

    OK: Go to next step 

  3. INSPECT SKID CONTROL ECU (INPUT WAVEFORM) 
    1. Check the input waveform.
      Fig 3: Identifying A61 Connector Terminals
      GTY358585Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Reconnect the A61 connector.
      2. Remove the combination meter assembly with the connector(s) still connected.
      3. Connect an oscilloscope to terminal H19-39 (SI) and body ground.
      4. Turn the power switch on (IG).
      5. Turn the wheel slowly.
      6. Check the signal waveform according to the condition(s) in the table below.
        Item Condition
        Tool setting 5 V/DIV., 20 ms./DIV.
        Vehicle condition Wheel being rotated
        TEXT IN ILLUSTRATION

        *a Component with harness connected
        (Combination Meter Assembly)

        OK

        The waveform is displayed as shown in the illustration.

        HINT: 

        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.

    NG → See step   16 

    OK → See step   17 

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - SKID CONTROL ECU) 
    1. Disconnect the H19 and A61 connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A61-11 (SP1) - H19-39 (SI) Always Below 1 Ω
      A61-11 (SP1) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   17 

  5. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - JUNCTION CONNECTOR) 
    1. Disconnect the junction connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H19-40 (+S) - H117-59 Always Below 1 Ω
      H19-40 (+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 (JUNCTION CONNECTOR) 
    1. Inspect for a short in the circuit that is connected to the junction block connector shown in the wiring diagram.

      HINT: 

      If voltage is not present, 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 connector.
        Fig 4: Identifying Junction Connector Terminals
        GTY347488Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      2. Measure the voltage according to the value(s) in the table below.

        Standard Voltage

        Tester Connection Condition Specified Condition
        H117-29 - Body ground Power switch on (IG) 4.5 to 14 V
        H117-19 - Body ground Power switch on (IG) 4.5 to 14 V
        H117-89 - Body ground Power switch on (IG) 4.5 to 14 V
        H117-57 - Body ground Power switch on (IG) 4.5 to 14 V
        H117-58 - Body ground Power switch on (IG) 4.5 to 14 V
        H117-79 - Body ground Power switch on (IG) 4.5 to 14 V
        H117-99 - Body ground Power switch on (IG) 4.5 to 14 V
        TEXT IN ILLUSTRATION

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

        Result

        Result Proceed to
        Voltage is not present in one circuit. A
        Voltage is present in all the circuits. B

    B → REPLACE JUNCTION CONNECTOR 

    A: Go to next step 

  7. SYSTEM CHECK 
    1. Select the circuit for which voltage was not present in step 6.

      Result

      Tester Connection System that Uses the Circuit Proceed to
      H117-29 - Body ground Hybrid Control System A
      H117-19 - Body ground Wiper and Washer System*1 B
      H117-58 - Body ground Lighting System*2 C
      H117-57 - Body ground Tire Pressure Warning System*3 D
      H117-79 - Body ground Safety Connect System*4 E
      H117-89 - Body ground Audio/Visual System E
      H117-99 - Body ground Audio/Visual System*5 E
      H117-99 - Body ground Navigation System*6 or *7 E
      • *1: w/ Auto Wiper System
      • *2: w/ Automatic Type Headlight Beam Level Control
      • *3: w/ Tire Pressure Warning System
      • *4: w/ Manual (SOS) Switch
      • *5: w/o Navigation System
      • *6: w/ Navigation System (for DVD)
      • *7: w/ Navigation System (for HDD)

    B → See step   9 

    C → See step   10 

    D → See step   11 

    E → See step   12 

    A: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU CIRCUIT) 
    1. Disconnect the H3 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H3-14 (SPDI) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   18 

  9. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER RELAY ASSEMBLY CIRCUIT) 
    1. Disconnect the H75 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H75-19 (SPD) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   25 

  10. CHECK HARNESS AND CONNECTOR (HEADLIGHT LEVELING ECU ASSEMBLY CIRCUIT) 
    1. Disconnect the A46 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A46-16 (SPDR) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   22 

  11. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU CIRCUIT) 
    1. Disconnect the H10 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H10-2 (SPD) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   19 

  12. SYSTEM CHECK 
    1. Select the circuit for which voltage was not present in step 6.

      Result

      Tester Connection System that Uses the Circuit Proceed to
      H117-79 - Body ground Safety Connect System*1 A
      H117-89 - Body ground Audio/Visual System B
      H117-99 - Body ground Audio/Visual System*2 C
      H117-99 - Body ground Navigation System*3 or *4 C
      • *1: w/ Manual (SOS) Switch
      • *2: w/o Navigation System
      • *3: w/ Navigation System (for DVD)
      • *4: w/ Navigation System (for HDD)

    B → See step   14 

    C → See step   15 

    A: Go to next step 

  13. CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) CIRCUIT) 
    1. Disconnect the H67 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H67-10 (SPDP) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   24 

  14. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY CIRCUIT) 
    1. Disconnect the H56*1 or H55*2 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H56-2 (SPD)*1 - Body ground Always 10 kΩ or higher
      H55-11 (SPD)*2 - Body ground Always 10 kΩ or higher
      • *1: w/ Navigation System
      • *2: w/o Navigation System

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   21 

  15. CHECK HARNESS AND CONNECTOR 
    1. Disconnect the H47*1, H52*2, or H60*3 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      H47-17 (SPD)*1 - Body ground Always 10 kΩ or higher
      H52-3 (SPD)*2 - Body ground Always 10 kΩ or higher
      H60-18 (SPD)*3 - Body ground Always 10 kΩ or higher
      • *1: w/o Navigation System, w/ Built-in Type Amplifier
      • *2: w/o Navigation System, w/ Separate Type Amplifier
      • *3: w/ Navigation System

      Result

      Result Proceed to
      OK (w/o Navigation System) A
      OK (w/ Navigation System (for HDD)) B
      OK (w/ Navigation System (for DVD)) C
      NG D

    B → See step   20 

    C → See step   26 

    D → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A → See step   23 

  16. REPLACE SKID CONTROL ECU. Refer to  REMOVAL 
  17. REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL 
  18. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to  REMOVAL 
  19. REPLACE TIRE PRESSURE WARNING ECU. Refer to  REMOVAL 
  20. REPLACE NAVIGATION COMPUTER SUB-ASSEMBLY. Refer to  REMOVAL 
  21. REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to  REMOVAL 
  22. REPLACE HEADLIGHT LEVELING ECU ASSEMBLY. Refer to  REMOVAL 
  23. REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL 
  24. REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL 
  25. REPLACE WINDSHIELD WIPER RELAY ASSEMBLY. Refer to  REMOVAL 
  26. REPLACE DISPLAY AND NAVIGATION MODULE DISPLAY. Refer to  REMOVAL 
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