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Home › Lexus › 2003 › ES 300 › Repair and Diagnosis › External Pages › Different car › Section 171 (Combination Meter - Diagnostics) › Malfunction In Speedometer › Inspection Procedure

Inspection Procedure

WARNING: This page is about a different car, the 2004 Toyota Camry. However, it is still accessible from the selected car via links, so may be relevant.
  1. CONFIRM ENGINE MODELS 
    1. Confirm the engine models.
    CONFIRM ENGINE MODELS

    A B
    1MZ-FE 2AZ-FE
    1. B: Go to step   5 
    2. A: Go to next step. 
  2. CHECK COMBINATION METER ASSY 

    INSPECTION USING OSCILLOSCOPE 

    1. Check the input signal waveform.
      1. Remove the combination meter assy.
      2. Connect the oscilloscope to the terminals C7-35 and body ground.
      3. Start the engine.
        Fig 1: Identifying Combination Meter Assy C7-35
        G02895106Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Check the signal waveform according to the condition in SIGNAL WAVEFORM  .
      SIGNAL WAVEFORM

      Item Condition
      Tool setting 5 V/DIV, 20 ms/DIV
      Vehicle condition Driving at approx. 20Km/h

      Standard: 

      As shown in the illustration 

    HINT:

    As the vehicle speed increases, the cycle of the signal waveform narrows.

    Result: 

    RESULT

    A OK
    B NG (w/ ABS & BA & TRAC & VSC)
    C NG (w/ ABS)
    Fig 2: Signal Waveform
    G02895107Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. B: Go to step   3 
    2. C: Go to step   4 
    3. A: CHECK AND REPLACE COMBINATION METER ASSY 
  3. INSPECT SKID CONTROL ECU ASSY 
    1. Check voltage.
      1. Shift the shift lever to neutral.
      2. Jack up either of the front wheel.
      3. Turn the ignition switch to ON.
      4. Measure voltage between terminals S9-2 of the skid control ECU assy and body ground when the front wheel is turning slowly.

      Standard voltage: 

      Voltage is generated intermittently. 

      Fig 3: Identifying Combination Meter Assy Terminal S9-2
      G02895108Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 4: Volage Generation Wave Form
      G02895109Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: CHECK AND REPLACE SKID CONTROL ECU ASSY 
    2. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 
  4. INSPECT BRAKE ACTUATOR ASSY 
    1. Check voltage.
      1. Shift the shift lever to neutral.
      2. Jack up either of the front wheel.
      3. Turn the ignition switch to ON.
      4. TMC Made:

        Measure voltage between terminals S1-26 of ABS & Traction actuator assy and body ground when the front wheel is turning slowly.

        Fig 5: Identifying Terminals S1-26 Of ABS & Traction Actuator Assy
        G02895110Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      5. TMMK Made:

        Measure voltage between terminals S1-10 of ABS & Traction actuator assy and body ground when the front wheel turning slowly.

      Standard voltage: 

      Voltage is generated intermittently. 

      Fig 6: Identifying Terminals S1-10 Of ABS & Traction Actuator Assy
      G02895111Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 7: Standard Voltage Waveform
      G02895112Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: CHECK AND REPLACE BRAKE ACTUATOR ASSY 
    2. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 
  5. CHECK COMBINATION METER ASSY 

    INSPECTION USING OSCILLOSCOPE 

    1. Check the input signal waveform.
      1. Remove the combination meter assy.
      2. Connect the oscilloscope to the terminals C7-35 and body ground.
      3. Start the engine.
        Fig 8: Identifying Combination Meter Assy Terminal C7-35
        G02895113Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      4. Check the signal waveform according to the condition in SIGNAL WAVEFORM  .
      SIGNAL WAVEFORM

      Item Condition
      Tool setting 5 V/DIV, 20 ms/DIV
      Vehicle condition Driving at approx. 20Km/h

      Standard: 

      As shown in  Fig 9 

      Fig 9: Standard Waveform
      G02895114Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    As the vehicle speed increases, the cycle of the signal waveform narrows.

    1. OK: CHECK AND REPLACE COMBINATION METER ASSY 
    2. NG: Go to next step. 
  6. INSPECT SPEED SENSOR 
    1. Check voltage.
      1. Shift the shift lever to neutral.
      2. Jack up either of the front wheel.
      3. Turn the ignition switch to ON.
      4. Measure voltage between terminals 3 and 2 of speed sensor when the front wheel is turning slowly.

      Standard voltage: 

      Voltage is generated intermittently. 

      Fig 10: Identifying Terminals Of Speed Sensor
      G02895115Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      Fig 11: Standard Voltage Waveform
      G02895116Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. NG: REPLACE SPEED SENSOR 
    2. OK: REPAIR OR REPLACE HARNESS OR CONNECTOR 
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