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Home >> Toyota >> 2002 >> MR2 C56M >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Combination Meter >> Inspection

Combination Meter: Inspection

  1. INSPECT SPEEDOMETER ON-VEHICLE 

    Using a speedometer tester, inspect the speedometer for allowable indication error and check the operation of the odometer.

    NOTE: Tire wear and tire over or under inflation will increase the indication error.
    Fig 1: Identifying Speedometer Allowable Indication Error Ranges
    G01939294Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If error is excessive, replace the combination meter.

  2. INSPECT SPEEDOMETER RESISTANCE 

    Measure the resistance between terminals with an ohmmeter at the positions shown.

    Fig 2: Locating Speedometer Test Terminals
    G01939296Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 3: Identifying Speedometer Test Resistance Values
    G01939295Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If resistance value is not as specified, replace the combination meter.

  3. INSPECT TACHOMETER ON-VEHICLE 
    1. Connect a tune-up test tachometer, and start the engine.
      NOTE: Reversing the connection of the tachometer will damage the transistors and diodes inside.
    2. Compare the tester indications with tachometer indications.
      3. Fig 4: Identifying Tachometer Indication Allowable Ranges
      G01939297Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    RPM (DC 13.5 V, 25°C (77°F)) 

    If error is excessive, replace the combination meter.

  4. INSPECT TACHOMETER RESISTANCE 

    Measure the resistance between terminals with an ohmmeter at the positions shown.

    Fig 5: Locating Tachometer Test Terminals
    G01939299Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 6: Identifying Tachometer Test Resistance Values
    G01939298Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If resistance value is not as specified, replace the combination meter.

  5. INSPECT FUEL RECEIVER GAUGE OPERATION 
    1. Disconnect the connector from the fuel pump assembly.
    2. Turn the ignition switch ON, check that the receiver gauge needle indicates EMPTY.
      Fig 7: Disconnecting Fuel Sender To See If Gauge Reads EMPTY
      G01939300Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Connect terminals 2 and 3 of the wire harness side connector through a 3.4 W test bulb.
    4. Turn the ignition switch ON, check that the bulb lights up and receiver gauge needle indicators EMPTY.

    If operation is not as specified, inspect the sender gauge resistance.

    Fig 8: Shorting Fuel Sender Connector To See If Gauge Read FULL
    G01939301Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  6. INSPECT FUEL RECEIVER GAUGE RESISTANCE 

    Measure the resistance between terminals with an ohmmeter at the positions shown.

    Fig 9: Locating Fuel Receiver Gauge Test Terminals
    G01939303Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 10: Identifying Fuel Receiver Gauge Resistance Test Values
    G01939302Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If resistance value is not as specified, replace the combination meter.

  7. INSPECT FUEL SENDER GAUGE RESISTANCE 

    Measure the resistance between terminals 2 and 3 for each float position.

    Fig 11: Identifying Fuel Sender Gauge Test Terminals
    G01939305Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 12: Identifying Fuel Sender Gauge Resistance Values
    G01939304Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If resistance value is not as specified, replace the sender gauge.

  8. INSPECT ENGINE COOLANT TEMPERATURE RECEIVER GAUGE RESISTANCE 

    Measure the resistance between terminals with fixing pointer to the stopper.

    Fig 13: Locating Coolant Temperature Receiver Gauge Test Terminals
    G01939307Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 14: Identifying Coolant Temperature Receiver Gauge Resistance Test Values
    G01939306Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If resistance value is not as specified, replace the combination meter.

  9. INSPECT LOW OIL PRESSURE WARNING LIGHT 
    1. Disconnect the connector from the warning switch and ground terminal of the wire harness side connector.
      Fig 15: Grounding Low Oil Pressure Warning Light Circuit
      G01939308Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch ON, check that the warning light lights up.

    If the warning light does not light up, test the LED or inspect wire harness.

  10. INSPECT LOW OIL PRESSURE SWITCH CONTINUITY 
    1. Check that continuity exists between terminal and ground with the engine stopped.
      Fig 16: Testing Low Oil Pressure Switch
      G01939309Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that no continuity exists between terminal and ground with the engine running.
    NOTE: The oil pressure should be over 24.5 kPa (0.25 kgf/cm2 , 3.55 psi).

    If operation is not as specified, replace the switch.

  11. INSPECT BRAKE WARNING SYSTEM LIGHT 
    1. Disconnect the connector from the brake fluid warning switch.
    2. Connect terminals of the wire harness side of the level warning switch connector.
      3. Fig 17: Bypassing Brake Fluid Warning Switch To Test Circuit
      G01939310Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Start the engine, check that the warning light lights up.

    If the warning light does not light up, test the LED or wire harness.

  12. INSPECT BRAKE FLUID LEVEL WARNING SWITCH CONTINUITY 
    1. Remove the reservoir cap and strainer.
    2. Disconnect the connector.
    3. Check that no continuity exists between terminals with the switch OFF (float up).
      Fig 18: Testing Brake Fluid Level Warning Switch
      G01939311Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Use siphon, etc. to take fluid out of the reservoir.
    5. Check that continuity exists between terminals with the switch ON (float down).
    6. Pour the fluid back in the reservoir.

    If operation is not as specified, replace the switch.

  13. INSPECT PARKING BRAKE WARNING LIGHT 
    1. Disconnect the connector from the parking brake switch.
    2. Ground terminal of the wire harness side connector.
      Fig 19: Grounding Parking Brake Warning Light Circuit
      G01939312Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Start the engine, check that the warning light lights up.

    If the warning light does not light up, test the LED or inspect wire harness.

  14. INSPECT PARKING BRAKE SWITCH CONTINUITY 
    1. Check that continuity exists between terminal and switch body with the switch ON (switch pin released).
      Fig 20: Checking Parking Brake Switch Continuity
      G01939313Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that no continuity exists between terminal and switch body with the switch OFF (switch pin pushed in).

    If operation is not as specified, replace the switch or inspect ground point.

  15. INSPECT OPEN DOOR WARNING LIGHT 
    1. Disconnect the connector from the door courtesy switch.
    2. Ground terminal of the wire harness side connector.
      Fig 21: Grounding Open Door Warning Light Circuit
      G01939314Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Start the engine, check that the warning light lights up.

    If the warning light does not light up, test the LED or inspect wire harness.

  16. Driver's side: 

    INSPECT SEAT BELT WARNING LIGHT 

    1. Disconnect the connector from buckle switch and ground terminal on the wire harness side connector.
      Fig 22: Bypassing Seat Belt Buckle Switch To Test Circuit
      G01939315Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch ON and check that the warning light lights up.

    If the warning light does not light up, test the LED or inspect wire harness.

  17. Driver's side: 

    INSPECT BUCKLE SWITCH CONTINUITY  . See INSPECTION Step 2 UnderINSPECTION

  18. Passenger's side: 

    INSPECT BUCKLE SWITCH CONTINUITY 

    1. Check that continuity exists between terminals 1 and 3 the switch side connectors with the switch OFF (belt fastened).
      Fig 23: Testing Seat Belt Buckle Switch Continuity (Passenger)
      G01939316Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that no continuity exists between terminals 1 and 3 the switch side connectors with the switch ON (belt unfastened).

    If operation is not as specified, replace the switch.

  19. Passenger's seat only: 

    INSPECT SEAT BELT WARNING OCCUPANT DETECTION SENSOR CONTINUITY 

    Check that continuity exists between terminals 1 and 2 when pressing the sensing part.

    Fig 24: Testing Passenger Seat Occupant Detection Sensor
    G01939317Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If operation is not as specified, replace the seat cushion pad with sensor.

  20. INSPECT LIGHT CONTROL RHEOSTAT OPERATION 

    Gradually, turn the rheostat knob from the bright side to the dark side and check that the resistance decreases from 10 k/ohms to 0 ohms between terminals 4 and 5. (Rheostat knob turned to clockwise)

    Fig 25: Identifying Light Control Rheostat Test Terminals
    G01939318Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    If operation is not as specified, replace the light control rheostat.

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