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Combination Meter: Inspection

WARNING: This page is about a different car, the 2002 Toyota Sienna. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: Tire wear and tire over or under inflation will increase the indication error.
    Fig 1: Speedometer Allowable Indication Error
    G01939570Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  1. Inspect Speedometer On-Vehicle  .

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

    If error is excessive, replace the speedometer.

  2. Inspect Tachometer On-Vehicle (W/Tachometer)  .
      CAUTION:
      • Reversing the connection of the tachometer will damage the transistors and diodes inside.
      • When removing or installing the tachometer, be careful not to drop or subject it to heavy shocks.
    1. Connect a tune-up test tachometer, and start the engine.
    2. Compare the tester and tachometer indications.
    Fig 2: Tachometer Allowable Indication Error
    G01939571Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  3. Inspect Fuel Receiver Gauge Operation  .
    1. Disconnect the connector from the sender gauge.
      2. NOTE: Because of the silicon oil in the gauge, it will take a short time for needle to stabilize.
      Fig 3: Testing Fuel Receiver Gauge Operation (1 Of 2)
      G01939572Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Turn the ignition switch ON, check that the receiver gauge needle indicates EMPTY.
    3. Connect terminals 1 and 2 on the wire harness side connector through a 3.4-W test bulb.
      4. Fig 4: Testing Fuel Receiver Gauge Operation (2 Of 2)
      G01939573Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Turn the ignition switch ON, check that the bulb lights up and the receiver gauge needle moves towards the full side.

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

  4. Inspect Fuel Receiver Gauge Resistance  .

    Measure the resistance between terminals.

    Fig 5: Measuring Fuel Receiver Gauge Resistance
    G01939575Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 6: Fuel Receiver Gauge Specifications
    G01939574Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

  5. Inspect Fuel Sender Gauge Resistance  .

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

    Fig 7: Measuring Fuel Sender Gauge Resistance
    G01939577Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 8: Fuel Sender Gauge Specifications
    G01939576Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

  6. Inspect Fuel Level Warning Light.
    1. Disconnect the connector from the sender gauge.
    2. Connect terminals 1 and 3 on the wire harness side connector.
      Fig 9: Testing Fuel Level Warning Light
      G01939578Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Turn the ignition switch ON, check that the warning light lights up.

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

  7. Inspect Fuel Level Warning Switch  .
      NOTE: It takes a short time for the bulb to light up.
      Fig 10: Testing Fuel Level Warning Switch (1 Of 2)
      G01939579Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    1. Apply battery positive voltage between terminals 1 and 3 through a 3.4-W test bulb, check that the bulb lights up.
    2. Submerge the switch in fuel, check that the bulb goes out. If operation is not as specified, replace the sender gauge.
      Fig 11: Testing Fuel Level Warning Switch (1 Of 2)
      G01939580Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. Inspect Engine Coolant Temperature Receiver Gauge Operation  .
    1. Disconnect the connector from the sender gauge.
    2. Turn the ignition switch ON and check that the receiver gauge needle indicates COOL.
      Fig 12: Testing Engine Coolant Temperature Receiver Gauge (1 Of 2)
      G01939581Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Ground terminal on the wire harness side connector through a 3.4-W test bulb.
      Fig 13: Testing Engine Coolant Temperature Receiver Gauge (2 Of 2)
      G01939582Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Turn the ignition switch ON, and check that the bulb lights up and the receiver gauge needle moves to the hot side.

    If operation is as specified, replace the sender gauge.

    Then recheck the system.

    If operation is not as specified, measure the receiver gauge resistance.

  9. Inspect Engine Coolant Temperature Receiver Gauge Resistance  .
    NOTE:

    Connect the test leads so that the current from the ohmmeter can flow according to the order indicated in Fig 15.

    This circuit includes the diode.

    Measure the resistance between terminals.

    Fig 14: Measuring Engine Coolant Temperature Sender Gauge Resistance
    G01939584Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 15: Engine Coolant Temperature Sender Gauge Specifications
    G01939583Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

  10. Inspect Engine Coolant Temperature Sender Gauge Resistance  .

    Connect the wire harness as shown in Fig 16, and enter the value in the left formula. Check the resistance conforms to the values in Fig 17.

    Fig 16: Determining Engine Coolant Temperature Sender Gauge Resistance
    G01939586Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Fig 17: Engine Coolant Temperature Sender Gauge Specifications
    G01939585Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

  11. Inspect Low Oil Pressure Warning Light  .
    1. Disconnect the connector from the warning switch and ground terminal on the wire harness side connector.
      2. Fig 18: Testing Low Oil Pressure Warning Light
      G01939587Courtesy 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 bulb.

    12. NOTE: Oil pressure should be over 24.5 kPa (0.25 kgf.cm2, 3.55 psi).
  12. Inspect Low Oil Pressure Switch  .
    1. Disconnect the connector from the switch.
    2. Check that continuity exists between terminal and ground with the engine stopped.
      Fig 19: Testing Low Oil Pressure Switch
      G01939588Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Check that no continuity exists between terminal and ground with the engine running.

    If operation is not as specified, replace the switch.

  13. Inspect Brake System Warning Light  .
    1. Disconnect the connector from the brake fluid warning switch.
    2. Release the parking brake pedal.
    3. Connect the terminals on the wire harness side of the level warning switch connector.
      Fig 20: Testing Brake Warning Light
      G01939589Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Start the engine, check that the warning light lights up. If the warning light does not light up, test the bulb or wire harness.
  14. Inspect Brake Fluid Level Warning Switch Continuity  .
    1. Remove the reservoir tank cap and strainer.
    2. Disconnect the connector.
    3. Check that no continuity exists between the terminals with the switch OFF (float up).
      Fig 21: Testing Brake Fluid Level Warning Switch
      G01939590Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    4. Use siphon, etc. to take fluid out of the reservoir tank.
    5. Check that continuity exists between the terminals with the switch ON (float down).
    6. Pour the fluid back in the reservoir tank.

    If operation is not as specified, replace the switch.

  15. Inspect Parking Brake Switch Continuity  .
    1. Check that continuity exists between terminals with the switch ON (switch pin released).
      Fig 22: Testing Parking Brake Warning Light
      G01939591Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that no continuity exists between terminals with switch OFF (switch pin pushed in).

    If operation is not as specified, replace the switch.

  16. Inspect Washer Level Warning Light  .
    1. Disconnect the connectors from the level warning switch and parking brake switch.
    2. Connect terminals on the wire harness side connector of the level warning switch connector.
      Fig 23: Testing Washer Level Warning Light
      G01939592Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Remove the GAUGE fuse and turn the ignition switch ON, and check that the waning light comes on.

    If the warning light does not light up, test the bulb.

  17. Inspect Washer Level Warning Switch  .
    1. Check that no continuity exists between terminals with the switch OFF (float up).
      Fig 24: Testing Washer Level Warning Switch
      G01939593Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that continuity exists between terminals with the switch ON (float down).

    If operation is not as specified, replace the switch.

  18. Inspect Open Door Warning Light  .

    Disconnect the connector from the door courtesy switch and ground terminal 1 on the wire harness side, and check that the warning light lights up.

    Fig 25: Testing Open Door Warning Light
    G01939594Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

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

  19. Inspect Seat Belt Warning Light  .
    1. Remove the integration relay from the instrument panel junction block.
    2. Ground terminal 2 on the integration relay with the connectors still connected.
      Fig 26: Testing Seat Belt Warning Light
      G01939595Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Turn the ignition switch ON and check that the warning light lights up.

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

  20. Inspect Buckle Switch Continuity  .
    1. Check that continuity exists between terminals on the switch side connector with the switch ON (belt unfastened).
      2. Fig 27: Testing Buckle Switch Continuity
      G01939596Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Check that no continuity exists between terminals on the switch side connector with the switch OFF (belt fastened).

    If operation is not as specified, replace the seat belt inner.

  21. Inspect Integration Relay Seat Belt Warning System Operation  .
    1. Connect the positive (+) lead from the battery to terminals 1 and 7.
      Fig 28: Testing Integration Relay Seat Belt Warning System Operation (1 Of 2)
      G01939597Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the terminal 7 to terminal 9 through the 3.4-W test bulb.
    3. Connect the negative (-) lead from the battery to terminal 10.
      4. NOTE: Check the buzzer within a period of 4 to 8 seconds.
    4. Check that the bulb flushes and the buzzer sounds for 4 - 8 seconds.
    5. Return to step ( a) and operate the buzzer again.
      Fig 29: Testing Integration Relay Seat Belt Warning System Operation (1 Of 2)
      G01939598Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    6. Connect the negative (-) lead from the battery to terminal 8.
    7. Check that the buzzer stops sounding.

    If operation is not as specified, replace the relay.

  22. Inspect Light Control Rheostat  .
    1. Connect the positive (+) lead from the battery to terminal 1 and negative lead (-) to terminal 2.
      Fig 30: Testing Light Control Rheostat
      G01939599Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    2. Connect the positive (+) lead from the voltmeter to terminal 1 and negative lead to terminal 3.
    3. Turn the rheostat knob and check that the voltage changes.
    4. Passenger seat only, 

      inspect seat belt warning occupant detection sensor continuity  :

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

      Fig 31: Testing Seat Belt Warning Occupant Detection Sensor (Passenger Side Only)
      G01939600Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

      If operation is not as specified, replace the sensor.

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