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Inspection Procedure

  1. INSPECT ECU TERMINAL VOLTAGE (INPUT VOLTAGE) 
    1. Disconnect the E1 connector.
    2. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      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:  Go to step  4

    Fig 1: Identifying E1 Connector
    G05420402Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    OK: Go to next step 

  2. INSPECT COMBINATION METER (OUTPUT VOLTAGE) 
    1. Reconnect the E1 connector.
    2. Disconnect the A24 connector.
    3. Measure the voltage according to the value(s) in the table below.

      Standard voltage 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      A24-11 (SPI) - Body ground Ignition switch on (IG) 11 to 14 V
      Fig 2: Identifying E1 Connector & A24 Connector
      G05420403Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG:  Go to step  12

    OK: Go to next step 

  3. INSPECT SKID CONTROL ECU (INPUT WAVEFORM) 
    1. Check the input waveform.
      1. Reconnect the A66 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.
        VOLTAGE CONDITION TABLE

        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 below. 

        HINT:

        When the system is functioning normally, one wheel revolution generates 4 pulses. As the vehicle speed increases, the width shown below by (A) narrows.

        Fig 3: Identifying Skid Control ECU A66 Connector
        G05420404Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPLACE SKID CONTROL ECU  (See REMOVAL )

    OK: REPLACE COMBINATION METER  (See REMOVAL  )

  4. 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 SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      E1-9 (+S) - E24-2 Always Below 1 Ω
      E1-9 (+S) - Body ground Always 10 kΩ or higher
      Fig 4: Identifying Combination Meter & Junction Connector
      G05420405Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: Go to next step 

  5. 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 SPECIFIED CONDITION TABLE

        Tester Connection Condition Specified Condition
        E24-4 - Body ground Ignition switch on (IG) 4.5 to 14 V
        D53-9 ((1)) - Body ground Ignition switch on (IG) 4.5 to 14 V
        E24-1 ((3)) - Body ground Ignition switch on (IG) 4.5 to 14 V
        E24-3 ((2)) - Body ground Ignition switch on (IG) 4.5 to 14 V
        D53-11 - Body ground Ignition switch on (IG) 4.5 to 14 V
        (1) w/ Smart Key System
        (2) w/ Navigation System
        (3) Separate Type Amplifier System
        Fig 5: Identifying Junction Connectors E24 & D46
        G05420406Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

        Result 

        RESULT TABLE

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

    B: PLACE JUNCTION CONNECTOR 

    A: Go to next step 

  6. SYSTEM CHECK 
    1. Select the circuit that did not present the voltage in the step.

      Result 

      RESULT TABLE

      Tester Connection System that uses the circuit Proceed to
      D53-9 ((1)) - Body ground Smart key system A
      D53-11 - Body ground SFI system or Tire pressure warning system ((3)) B
      E24-3 ((2)) - Body ground Navigation system C
      E24-4 Body ground Audio/visual system D
      E24-1 ((4)) - Body ground Separate type amplifier system E
      (1) w/ Smart Key System
      (2) w/ Navigation System
      (3) w/ Tire Pressure Warning System
      (4) Separate Type Amplifier System

    B:  Go to step  8

    C:  Go to step  9

    D:  Go to step  10

    E:  Go to step  11

    A: Go to next step 

  7. 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 SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      D9-9 (SPD) ((1)) - Body ground Always 10 kΩ or higher
      (1) w/ Smart Key System
      Fig 6: Identifying Wire Harness Connector D8
      G05420407Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE MAIN BODY ECU 

  8. CHECK HARNESS AND CONNECTOR (ECM CIRCUIT, TIRE PRESSURE WARNING CIRCUIT) 
    1. Disconnect the D36 or D33 (*3) connector.
    2. Measure the resistance according to the value(s) in the table below.

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      D36-8 (SPD) - Body ground Always 10 kΩ or higher
      D33-2 (SPD) ((1)) - Body ground Always 10 kΩ or higher
      (1) w / Tire Pressure Warning System
      Fig 7: Identifying Wire Harness Connector D36 & D33
      G05420408Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      Result 

      RESULT TABLE

      Result Proceed to
      OK (for Engine Control System) A
      OK (for Tire Pressure Warning System (*3)) B
      NG C

    B: REPLACE TIRE PRESSURE WARNING ECU  (See REMOVAL )

    C: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A: REPLACE ECM (for 2GR-FE)  (See REMOVAL )

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

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      E5-3 (SPD) ((1)) - Body ground Always 10 kΩ or higher
      (1) w/ Navigation System
      Fig 8: Identifying Wire Harness Connector E5
      G05420409Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE NAVIGATION RECEIVER  (See REMOVAL )

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

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      E3-3 (SPD) - Body ground Always 10 kΩ or higher
      Fig 9: Identifying Wire Harness Connector E3
      G05420410Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE RADIO RECEIVER  (See REMOVAL )

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

      Standard resistance 

      TESTER CONNECTION SPECIFIED CONDITION TABLE

      Tester Connection Condition Specified Condition
      N14-3 (SPD) ((1)) - Body ground Always 10 kΩ or higher
      (1) for Separate Type Amplifier System
      Fig 10: Identifying Stereo Component Amplifier Circuit N14 Connector
      G05420411Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    B: REPLACE JUNCTION CONNECTOR 

    C: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    A: REPLACE STEREO COMPONENT AMPLIFIER  (See REMOVAL )

  12. 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 SPECIFIED CONDITION TABLE

      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
      Fig 11: Identifying Combination Meter & Skid Control ECU Connector
      G05420412Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

    OK: REPLACE COMBINATION METER  (See REMOVAL  )

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