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Speed Signal Circuit: Procedure

  1. INSPECT COMBINATION METER ASSEMBLY (OUTPUT WAVEFORM) 
    1. Check the output waveform.
      Fig 1: Identifying Combination Meter Connector Terminal
      GTY207269Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Remove the combination meter assembly with connector(s) still connected.
      2. Connect the oscilloscope to the terminals F2-12 (+S) and body ground.
      3. Ignition switch on (IG).
      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.
        Vehicle condition Driving at approx. 20 km/h (12 mph)

        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   2 

    OK → RETURN TO THE ORIGINAL INSPECTION FOR OTHER SYSTEM 

  2. INSPECT ECU TERMINAL VOLTAGE (INPUT VOLTAGE) 
    1. Disconnect the F2 connector.
      Fig 2: Identifying Combination Meter Connector Terminal
      GTY169899Courtesy 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
      F2-12 (+S) - Body ground Ignition switch on (IG) 4.5 to 14 V

      HINT: 

      If any of the ECUs specified in the wiring diagram supplied power to the combination meter, the combination meter will output a waveform.

    NG → See step   5 

    OK: Go to next step 

  3. INSPECT COMBINATION METER ASSEMBLY (OUTPUT VOLTAGE) 
    1. Disconnect the A60 (*1) or A26 (*2) connector.
      Fig 3: Skid Control ECU Wire Harness Views
      GTY181717Courtesy 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
      A60-33 (SP1) (*1) - Body ground Ignition switch on (IG) 10 to 14 V
      A26-12 (SP1) (*2) - Body ground Ignition switch on (IG) 10 to 14 V

      *1: except TMC Made

      *2: for TMC Made

    NG → See step   17 

    OK: Go to next step 

  4. INSPECT SKID CONTROL ECU (INPUT WAVEFORM) 
    1. Check the input waveform.
      Fig 4: Identifying Combination Meter Connector Terminal
      GTY174906Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Reconnect the A60 (*1) or A26 (*2) connector.
      2. Remove the combination meter assembly with connector(s) still connected.
      3. Connect the oscilloscope to the terminals F2-14 (SI) and body ground.
      4. Ignition 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)

        *1: for TMC Made

        *2: except TMC Made

        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 → REPLACE SKID CONTROL ECU 

    OK → REPLACE SKID CONTROL ECU 

  5. CHECK HARNESS AND CONNECTOR (COMBINATION METER - NO. 3 JUNCTION BLOCK) 
    1. Disconnect the A No. 3 junction block connector.
      Fig 5: Identifying Combination Meter And Junction Block Connector Terminals
      GTY207268Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      F2-12 (+S) - 3P-3 Always Below 1 Ω
      F2-12 (+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 (NO. 3 JUNCTION BLOCK) 
    1. Inspect for a short in the circuit that connected the No. 3 junction block shown in the wiring diagram.

      HINT: 

      If voltage is not present, the circuit (ECU) was possibly the malfunctioning circuit. This is the circuit that will be diagnosed by following the A step that follows.

      1. Disconnect the B and C No. 3 junction block connectors.
        Fig 6: Identifying Junction Block Connector Terminals
        GTY169361Courtesy 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
        3B-10 - Body ground Ignition switch on (IG) 4.5 to 14 V
        3M-10 - Body ground Ignition switch on (IG) 4.5 to 14 V
        3O-10 - Body ground Ignition switch on (IG) 4.5 to 14 V
      3. Reconnect the C No. 3 junction block connectors.
        Fig 7: Junction Block Wire Harness View
        GTY173249Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Measure the voltage according to the value(s) in the table below.

        Standard voltage

        Tester Connection Condition Specified Condition
        3T-9 - Body ground Ignition switch on (IG) 4.5 to 14 V
        3U-9 (*2) - Body ground Ignition switch on (IG) 4.5 to 14 V
        3U-10 (*1) - Body ground Ignition switch on (IG) 4.5 to 14 V

        *1: for Separate Type Amplifier System

        *2: with Navigation System

        Result

        Result Proceed to
        Voltage is not present in one circuit. (without Smart Key System) A
        Voltage is not present in one circuit. (with Smart Key System) B
        Voltage is present in all the circuits. C

    B → See step   13 

    C → REPAIR OR REPLACE HARNESS OR CONNECTOR (NO. 3 JUNCTION BLOCK) 

    A: Go to next step 

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

      Result

      Tester Connection System that uses the circuit Proceed to
      3B-10 - Body ground SFI System A
      3O-10 - Body ground Tire Pressure Warning System B
      3T-9 - Body ground Audio/Visual System C
      3U-9 (*1) - Body ground Navigation System D
      3U-10 (*2) - Body ground Audio/Visual System (for Separate Type Amplifier System) E

      *1: with Navigation System

      *2: for Separate Type Amplifier System

    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 (ECM CIRCUIT) 
    1. Disconnect the A24 (*1) or A55 (*2) connector.
      Fig 8: ECM Connector Wire Harness View
      GTY188097Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      A24-15 (SPD) (*1) - Body ground Always 10 kΩ or higher
      A55-8 (SPD) (*2) - Body ground Always 10 kΩ or higher

      *1: for 2AR-FE

      *2: for 2GR-FE

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE ECM 

  9. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU CIRCUIT) 
    1. Disconnect the E60 connector.
      Fig 9: Identifying E60 Tire Pressure Warning ECU Connector Terminal
      GTY180902Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      E60-2 (SPD) (*) - Body ground Always 10 kΩ or higher

      *: with Tire Pressure Warning System

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE TIRE PRESSURE WARNING ECU 

  10. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER CIRCUIT) 
    1. Disconnect the F8 connector.
      Fig 10: Identifying F8 Radio Receiver Connector Terminal
      GTY178337Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      F8-3 (SPD) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE RADIO RECEIVER ASSEMBLY 

  11. CHECK HARNESS AND CONNECTOR (NAVIGATION RECEIVER CIRCUIT) 
    1. Disconnect the F13 connector.
      Fig 11: Identifying F13 Navigation Receiver Connector Terminal
      GTY206384Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      F13-3 (SPD) (*) - Body ground Always 10 kΩ or higher

      *: with Navigation System

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE NAVIGATION RECEIVER ASSEMBLY 

  12. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER CIRCUIT) 
    1. Disconnect the F19 connector.
      Fig 12: Identifying F19 Stereo Component Amplifier Connector Terminal
      GTY207148Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      F19-11 (SPD) (*) - Body ground Always 10 kΩ or higher

      *: for Separate Type Amplifier System

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE STEREO COMPONENT AMPLIFIER 

  13. SYSTEM CHECK 
    1. Select the circuit in which is not present voltage in step 6.

      Standard resistance

      Tester Connection System That Uses the Circuit Proceed to
      3B-10 - Body ground SFI System A
      3B-10 - Body ground Automatic Transaxle System (for U660E) B
      3M-10 (*1) - Body ground Smart Key System (for 2GR-FE) C

      *1: with Smart Key System

    B → See step   15 

    C → See step   16 

    A: Go to next step 

  14. CHECK HARNESS AND CONNECTOR (ECM CIRCUIT) 
    1. Disconnect the A55 (*1) or A24 (*2) connector.
      Fig 13: ECM Connector Wire Harness View
      GTY174148Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      A55-8 (SPD) (*1) - Body ground Always 10 kΩ or higher
      A24-24 (SPD) (*2) - Body ground Always 10 kΩ or higher

      *1: for 2GR-FE

      *2: for 2AR-FE

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE ECM 

  15. CHECK HARNESS AND CONNECTOR (TCM CIRCUIT) 
    1. Disconnect the C56 connector.
      Fig 14: TCM Connector Wire Harness Side Front View
      GTY184358Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      C56-3 (SPD) (*) - Body ground Always 10 kΩ or higher

      *: for 2GR-FE

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE TCM 

  16. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU CIRCUIT) 
    1. Disconnect the E8 connector.
      Fig 15: Identifying E8 Combination Meter Connector Terminal
      GTY208434Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      E8-9 (SPD) (*) - Body ground Always 10 kΩ or higher

      *: with Smart Key System

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE MAIN BODY ECU 

  17. CHECK HARNESS AND CONNECTOR (COMBINATION METER - SKID CONTROL ECU) 
    1. Disconnect the F2 connector.
      Fig 16: Combination Meter & Skid Control ECU Wire Harness Views
      GTY186116Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      A60-33 (SP1) (*1) - F2-14 (SI) Always Below 1 Ω
      A60-33 (SP1) (*1) - Body ground Always 10 kΩ or higher
      A26-12 (SP1) (*2) - F2-14 (SI) Always Below 1 Ω
      A26-12 (SP1) (*2) - Body ground Always 10 kΩ or higher

      *1: except TMC Made

      *2: for TMC Made

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE COMBINATION METER ASSEMBLY 

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