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Speed Signal Circuit: Procedure

  1. INSPECT ECU TERMINAL VOLTAGE (INPUT VOLTAGE) 
    1. Disconnect the E1 connector.
      Fig 1: Checking ECU Terminal Voltage (Input Voltage)
      GTY207784Courtesy 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
      E1-9 (+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 

  2. INSPECT COMBINATION METER (OUTPUT VOLTAGE) 
    1. Reconnect the E1 connector.
    2. Disconnect the A24 connector.
      Fig 2: Checking Combination Meter (Output Voltage)
      GTY208210Courtesy 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
      A24-11 (SP1) - Body ground Ignition switch on (IG) 11 to 14 V

    NG → See step   4 

    OK: Go to next step 

  3. INSPECT SKID CONTROL ECU (INPUT WAVEFORM) 
    1. Check the input waveform.
      Fig 3: Checking Skid Control ECU With Waveform Reference
      GTY208213Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      1. Reconnect the A24 connector.
      2. Remove the combination meter assembly with the connector(s) still connected.
      3. Connect the oscilloscope to terminals E1-29 (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)

        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   14 

    OK → See step   13 

  4. CHECK HARNESS AND CONNECTOR (COMBINATION METER - SKID CONTROL ECU) 
    1. Disconnect the E1 connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      A24-11 (SP1) - E1-29 (SI) Always Below 1 Ω
      A24-11 (SP1) - Body ground Always 10 kΩ or higher

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   13 

  5. CHECK HARNESS AND CONNECTOR (COMBINATION METER - 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
      E1-9 (+S) - E24-6 Always Below 1 Ω
      E1-9 (+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, 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 junction connectors.
      2. Measure the voltage according to the value(s) in the table below.

        Standard voltage

        Tester Connection Condition Specified Condition
        D53-5 (*1) - Body ground Ignition switch on (IG) 4.5 to 14 V
        D53-6 (*2) - Body ground Ignition switch on (IG) 4.5 to 14 V
        E24-7 (*3) - Body ground Ignition switch on (IG) 4.5 to 14 V
        E24-7 (*4) - Body ground Ignition switch on (IG) 4.5 to 14 V
        E24-5 (*5) - Body ground Ignition switch on (IG) 4.5 to 14 V
        D53-7 - Body ground Ignition switch on (IG) 4.5 to 14 V

        *1: w/ Smart Key System

        *2: w/ Tire Pressure Warning System

        *3: w/o Navigation System

        *4: w/ Navigation System

        *5: w/ Back Door Speaker

        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 that did not present the voltage in the step 6.

      Result

      Tester Connection System that uses the circuit Proceed to
      D53-5 (*1) - Body ground Smart key system A
      D53-7 - Body ground SFI system or U760E Automatic Transaxle System B
      E24-7 (*2) - Body ground Audio/visual system C
      E24-7 (*3) - Body ground Navigation system C
      E24-5 (*4) - Body ground Audio/visual system D
      D53-6 (*5) - Body ground Tire pressure warning system E

      *1: w/ Smart Key System

      *2: w/o Navigation System

      *3: w/ Navigation System

      *4: w/ Back Door Speaker

      *5: w/ Tire Pressure Warning 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 (MAIN BODY ECU CIRCUIT) 
    1. Disconnect the D9 (*1) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      D9-9 (SPD) (*1) - Body ground Always 10 kΩ or higher

      *1: w/ Smart Key System

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → REPLACE MAIN BODY ECU 

  9. CHECK HARNESS AND CONNECTOR (ECM CIRCUIT, TCM CIRCUIT) 
    1. Disconnect the B52 (*1), D61 (*2), or D60 (*3) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      B52-3 (SPD) (*1) - Body ground Always 10 kΩ or higher
      D61-18 (SPD) (*2) - Body ground Always 10 kΩ or higher
      D60-29 (SPD) (*3) - Body ground Always 10 kΩ or higher

      *1: for U760E Automatic Transaxle System

      *2: for 2GR-FE

      *3: for 1AR-FE

      Result

      Result Proceed to
      OK (for 2GR-FE Engine Control System) A
      OK (for 1AR-FE Engine Control System) B
      OK (for U760E Automatic Transaxle System (*1)) C
      NG D

    B → See step   16 

    C → See step   17 

    D → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A → See step   15 

  10. CHECK HARNESS AND CONNECTOR (RADIO RECEIVER CIRCUIT, NAVIGATION RECEIVER CIRCUIT) 
    1. Disconnect the E3 (*1) or E5 (*2) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      E3-3 (SPD) (*1) - Body ground Always 10 kΩ or higher
      E5-3 (SPD) (*2) - Body ground Always 10 kΩ or higher

      *1: w/o Navigation System

      *2: w/ Navigation System

      Result

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

    B → See step   19 

    C → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A → See step   18 

  11. CHECK HARNESS AND CONNECTOR (STEREO COMPONENT AMPLIFIER ASSEMBLY CIRCUIT) 
    1. Disconnect the N14 (*1) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      N14-11 (SPD) (*1) - Body ground Always 10 kΩ or higher

      *1: w/ Back Door Speaker

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   20 

  12. CHECK HARNESS AND CONNECTOR (TIRE PRESSURE WARNING ECU CIRCUIT) 
    1. Disconnect the D33 (*1) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance

      Tester Connection Condition Specified Condition
      D33-2 (SPD) (*1) - Body ground Always 10 kΩ or higher

      *1: w/ Tire Pressure Warning System

    NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK → See step   21 

  13. REPLACE COMBINATION METER. Refer to  REMOVAL 
  14. REPLACE SKID CONTROL ECU. Refer to  REMOVAL 
  15. REPLACE ECM (for 2GR-FE). Refer to  REMOVAL - Step 7 
  16. REPLACE ECM (for 1AR-FE). Refer to  REMOVAL 
  17. REPLACE TCM (for U760E). Refer to  REMOVAL 
  18. REPLACE RADIO RECEIVER. Refer to  REMOVAL 
  19. REPLACE NAVIGATION RECEIVER. Refer to  REMOVAL - Step 6 
  20. REPLACE STEREO COMPONENT AMPLIFIER ASSEMBLY. Refer to  REMOVAL - Step 14 
  21. REPLACE TIRE PRESSURE WARNING ECU. Refer to  REMOVAL - Step 6 
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