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Speed Signal Circuit: Procedure

  1. INSPECT ECU TERMINAL VOLTAGE (INPUT VOLTAGE) 
    1. Disconnect the F15 connector.
      GTY281943Courtesy 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
      F15-3 (+S) - Body ground Engine switch on (IG) 4.5 to 14 V
      TEXT IN ILLUSTRATION

      *1 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 F15 connector.
    2. Disconnect the A44 connector.
      GTY261000Courtesy 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
      A44-11 (SP1) - Body ground Engine switch on (IG) 11 to 14 V
      TEXT IN ILLUSTRATION

      *1 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.
      GTY254369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Reconnect the A44 connector.
      2. Remove the combination meter assembly with the connector(s) still connected.
      3. Connect an oscilloscope to terminal F15-4 (SI) and body ground.
      4. Turn the engine 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 Driving at approx. 20 km/h (12 mph)
        TEXT IN ILLUSTRATION

        *1 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 F15 and A44 connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A44-11 (SP1) - F15-4 (SI) Always Below 1 Ω
      A44-11 (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 F93 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F15-3 (+S) - F93-57 Always Below 1 Ω
      F15-3 (+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 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 junction connector.
        GTY410556Courtesy 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
        F93-87 - Body ground Engine switch on (IG) 4.5 to 14 V
        F93-37 - Body ground Engine switch on (IG) 4.5 to 14 V
        F93-27 - Body ground Engine switch on (IG) 4.5 to 14 V
        F93-47 - Body ground Engine switch on (IG) 4.5 to 14 V
        F93-67 - Body ground Engine switch on (IG) 4.5 to 14 V
        F93-77 - Body ground Engine switch on (IG) 4.5 to 14 V
        F93-88 - Body ground Engine switch on (IG) 4.5 to 14 V
        TEXT IN ILLUSTRATION

        *1 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 → REPAIR OR REPLACE INSTRUMENT PANEL WIRE 

    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
      F93-87 - Body ground Tire Pressure Warning System*1 A
      F93-37 - Body ground Smart Access System with Push-button Start System B
      F93-27 - Body ground Audio and Visual System B
      F93-47 - Body ground Audio and Visual System*2 or Navigation System*3 B
      F93-67 - Body ground SFI System or Automatic Transaxle System B
      F93-77 - Body ground Wiper and Washer System*4 B
      F93-88 - Body ground Lexus Enform System*5 or Safety Connect System*5 C
      • *1: w/ Tire Pressure Warning System
      • *2: w/o Navigation System
      • *3: w/ Navigation System
      • *4: w/ Auto Wiper System
      • *5: w/ Manual (SOS) Switch

    B → See step   9 

    C → See step   15 

    A: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU CIRCUIT) 
    1. Disconnect the F53 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F53-2 (SPD) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   20 

  9. 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
      F93-37 - Body ground Smart Access System with Push-button Start System A
      F93-27 - Body ground Audio and Visual System B
      F93-47 - Body ground Audio and Visual System*1 or Navigation System*2 C
      F93-67 - Body ground SFI System or Automatic Transaxle System D
      F93-77 - Body ground Auto Wiper System*3 E
      • *1: w/o Navigation System
      • *2: w/ Navigation System
      • *3: w/ Auto Wiper System

    B → See step   11 

    C → See step   12 

    D → See step   13 

    E → See step   14 

    A: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU CIRCUIT) 
    1. Disconnect the F8 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F8-23 (SPD) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   18 

  11. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY CIRCUIT) 
    1. Disconnect the O35*1 or O33*2 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O35-17 (SPD)*1 - Body ground Always 10 kΩ or higher
      O33-11 (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   24 

  12. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY CIRCUIT, MULTI-MEDIA MODULE RECEIVER ASSEMBLY CIRCUIT) 
    1. Disconnect the G36*1, G38*2 or G9*3 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G36-56 (SPD)*1 - Body ground Always 10 kΩ or higher
      G38-17 (SPD)*2 - Body ground Always 10 kΩ or higher
      G9-3 (SPD)*3 - Body ground Always 10 kΩ or higher
      • *1: for Multi-media Module Receiver Type
      • *2: for Radio and Display Type
      • *3: for Radio Receiver Type

      Result

      Result Proceed to
      NG A
      OK (for Multi-media Module Receiver Type) B
      OK (for Radio and Display Type or Radio Receiver Type) C

    B → See step   25 

    C → See step   23 

    A → REPAIR OR REPLACE HARNESS OR CONNECTOR 

  13. CHECK HARNESS AND CONNECTOR (ECM CIRCUIT, TCM CIRCUIT) 
    1. Disconnect the A43 or D2 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A43-13 (SPD) - Body ground Always 10 kΩ or higher
      D2-3 (SPD) - Body ground Always 10 kΩ or higher

      Result

      Result Proceed to
      OK (for 2GR-FE SFI System) A
      OK (for U660E Automatic Transaxle System) B
      OK (for U660F Automatic Transaxle System) C
      NG D

    B → See step   26 

    C → See step   21 

    D → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A → See step   19 

  14. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH ASSEMBLY CIRCUIT) 
    1. Disconnect the F42 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F42-6 (SPD) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   22 

  15. CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) CIRCUIT) 
    1. Disconnect the G25 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G25-10 (SPDP) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   27 

  16. REPLACE SKID CONTROL ECU. Refer to  REMOVAL [03/2012 - 07/2012] 
  17. REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [03/2012 - 07/2012] 
  18. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to  REMOVAL [03/2012 - ] 
  19. REPLACE ECM. Refer to  REMOVAL [03/2012 - 07/2012] 
  20. REPLACE TIRE PRESSURE WARNING ECU. Refer to  REMOVAL [03/2012 - 07/2012] 
  21. REPLACE TCM (for U660F). Refer to  REMOVAL [03/2012 - 07/2012] 
  22. REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY. Refer to  REMOVAL [03/2012 - 07/2012] 
  23. REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [03/2012 - 07/2012] 
  24. REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to  REMOVAL [03/2012 - 07/2012] 
  25. REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY. Refer to  REMOVAL [03/2012 - 07/2012] 
  26. REPLACE TCM (for U660E). Refer to  REMOVAL [03/2012 - 07/2012] 
  27. REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [03/2012 - 07/2012] 


  1. INSPECT ECU TERMINAL VOLTAGE (INPUT VOLTAGE) 
    1. Disconnect the F15 connector.
      GTY281943Courtesy 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
      F15-3 (+S) - Body ground Engine switch on (IG) 4.5 to 14 V
      TEXT IN ILLUSTRATION

      *1 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 F15 connector.
    2. Disconnect the A44 connector.
      GTY261000Courtesy 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
      A44-11 (SP1) - Body ground Engine switch on (IG) 11 to 14 V
      TEXT IN ILLUSTRATION

      *1 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.
      GTY254369Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Reconnect the A44 connector.
      2. Remove the combination meter assembly with the connector(s) still connected.
      3. Connect an oscilloscope to terminal F15-4 (SI) and body ground.
      4. Turn the engine 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 Driving at approx. 20 km/h (12 mph)
        TEXT IN ILLUSTRATION

        *1 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 F15 and A44 connectors.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A44-11 (SP1) - F15-4 (SI) Always Below 1 Ω
      A44-11 (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 F93 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F15-3 (+S) - F93-57 Always Below 1 Ω
      F15-3 (+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 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 junction connector.
        GTY410556Courtesy 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
        F93-87 - Body ground Engine switch on (IG) 4.5 to 14 V
        F93-37 - Body ground Engine switch on (IG) 4.5 to 14 V
        F93-27 - Body ground Engine switch on (IG) 4.5 to 14 V
        F93-47 - Body ground Engine switch on (IG) 4.5 to 14 V
        F93-67 - Body ground Engine switch on (IG) 4.5 to 14 V
        F93-77 - Body ground Engine switch on (IG) 4.5 to 14 V
        F93-88 - Body ground Engine switch on (IG) 4.5 to 14 V
        TEXT IN ILLUSTRATION

        *1 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 → REPAIR OR REPLACE INSTRUMENT PANEL WIRE 

    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
      F93-87 - Body ground Tire Pressure Warning System*1 A
      F93-37 - Body ground Smart Access System with Push-button Start System B
      F93-27 - Body ground Audio and Visual System B
      F93-47 - Body ground Audio and Visual System*2 or Navigation System*3 B
      F93-67 - Body ground SFI System or Automatic Transaxle System*6 B
      F93-77 - Body ground Wiper and Washer System*4 B
      F93-88 - Body ground Lexus Enform System*5 or Safety Connect System*5 C
      • *1: w/ Tire Pressure Warning System
      • *2: w/o Navigation System
      • *3: w/ Navigation System
      • *4: w/ Auto Wiper System
      • *5: w/ Manual (SOS) Switch
      • *6: for U660E or U660F

    B → See step   9 

    C → See step   15 

    A: Go to next step 

  8. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU CIRCUIT) 
    1. Disconnect the F53 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F53-2 (SPD) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   20 

  9. 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
      F93-37 - Body ground Smart Access System with Push-button Start System A
      F93-27 - Body ground Audio and Visual System B
      F93-47 - Body ground Audio and Visual System*1 or Navigation System*2 C
      F93-67 - Body ground SFI System or Automatic Transaxle System*4 D
      F93-77 - Body ground Auto Wiper System*3 E
      • *1: w/o Navigation System
      • *2: w/ Navigation System
      • *3: w/ Auto Wiper System
      • *4: for U660E or U660F

    B → See step   11 

    C → See step   12 

    D → See step   13 

    E → See step   14 

    A: Go to next step 

  10. CHECK HARNESS AND CONNECTOR (POWER MANAGEMENT CONTROL ECU CIRCUIT) 
    1. Disconnect the F8 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F8-23 (SPD) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   18 

  11. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY CIRCUIT) 
    1. Disconnect the O35*1 or O33*2 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      O35-17 (SPD)*1 - Body ground Always 10 kΩ or higher
      O33-11 (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   24 

  12. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER ASSEMBLY CIRCUIT, MULTI-MEDIA MODULE RECEIVER ASSEMBLY CIRCUIT) 
    1. Disconnect the G36*1, G38*2 or G9*3 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G36-56 (SPD)*1 - Body ground Always 10 kΩ or higher
      G38-17 (SPD)*2 - Body ground Always 10 kΩ or higher
      G9-3 (SPD)*3 - Body ground Always 10 kΩ or higher
      • *1: for Multi-media Module Receiver Type
      • *2: for Radio and Display Type
      • *3: for Radio Receiver Type

      Result

      Result Proceed to
      NG A
      OK (for Multi-media Module Receiver Type) B
      OK (for Radio and Display Type or Radio Receiver Type) C

    B → See step   25 

    C → See step   23 

    A → REPAIR OR REPLACE HARNESS OR CONNECTOR 

  13. CHECK HARNESS AND CONNECTOR (ECM CIRCUIT, TCM CIRCUIT) 
    1. Disconnect the A43 or D2 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      A43-13 (SPD) - Body ground Always 10 kΩ or higher
      D2-3 (SPD) - Body ground Always 10 kΩ or higher

      Result

      Result Proceed to
      OK (for 2GR-FE SFI System) A
      OK (for U660E Automatic Transaxle System) B
      OK (for U660F Automatic Transaxle System) C
      NG D

    B → See step   26 

    C → See step   21 

    D → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A → See step   19 

  14. CHECK HARNESS AND CONNECTOR (WINDSHIELD WIPER SWITCH ASSEMBLY CIRCUIT) 
    1. Disconnect the F42 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      F42-6 (SPD) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   22 

  15. CHECK HARNESS AND CONNECTOR (DCM (TELEMATICS TRANSCEIVER) CIRCUIT) 
    1. Disconnect the G25 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      G25-10 (SPDP) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   27 

  16. REPLACE SKID CONTROL ECU. Refer to  REMOVAL [07/2012 - ] 
  17. REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [07/2012 - ] 
  18. REPLACE POWER MANAGEMENT CONTROL ECU. Refer to  REMOVAL [03/2012 - ] 
  19. REPLACE ECM. Refer to  REMOVAL [07/2012 - ] 
  20. REPLACE TIRE PRESSURE WARNING ECU. Refer to  REMOVAL [07/2012 - ] 
  21. REPLACE TCM (for U660F). Refer to  REMOVAL [07/2012 - ] 
  22. REPLACE WINDSHIELD WIPER SWITCH ASSEMBLY. Refer to  REMOVAL [07/2012 - ] 
  23. REPLACE RADIO RECEIVER ASSEMBLY. Refer to  REMOVAL [07/2012 - ] 
  24. REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to  REMOVAL [07/2012 - ] 
  25. REPLACE MULTI-MEDIA MODULE RECEIVER ASSEMBLY. Refer to  REMOVAL [07/2012 - ] 
  26. REPLACE TCM (for U660E). Refer to  REMOVAL [07/2012 - ] 
  27. REPLACE DCM (TELEMATICS TRANSCEIVER). Refer to  REMOVAL [07/2012 - ] 
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