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Combination Meter: Inspection

  1. w/o Tachometer (Connector connected): INSPECT COMBINATION METER CIRCUIT 

    Connect the connector "A" and "B" to the combination meter and inspect the wire harness side connectors from the back side as shown in the table.

    Fig 1: Identifying Combination Meter Connector & Dash; w/o Tachometers
    G02825971Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Combination Meter Circuit Inspection Table (without Tachometer)

    Tester connection Condition Specified condition
    A1 - Ground Constant Battery positive voltage
    A2 - Ground Ignition switch OFF No voltage
    A2 - Ground Ignition switch ON Battery positive voltage
    A3 - Ground Ignition switch ON and O/D off switch ON No voltage
    A3 - Ground Ignition switch ON and O/D off switch OFF Battery positive voltage
    A4 - Ground Light control switch OFF No voltage
    A4 - Ground Light control switch HI Battery positive voltage
    A5 - Ground Ignition switch OFF, LOCK or ACC No voltage
    A5 - Ground Ignition switch ST Battery positive voltage
    A6 - Ground Ignition switch ON and turn signal switch OFF or LEFT No voltage
    A6 - Ground Ignition switch ON and turn signal switch RIGHT Battery positive voltage
    A9 - Ground Ignition switch ON and window washer level warning switch float DOWN No voltage
    A9 - Ground Ignition switch ON and window washer level warning switch float UP Battery positive voltage
    A10 - Ground Ignition switch ON and SRS indicator light light up No voltage
    A10 - Ground Ignition switch ON and SRS indicator does not light up Battery positive voltage
    A11 - Ground Ignition switch ON and driver's seat belt is unfastened No voltage
    A11 - Ground Ignition switch ON and driver's seat belt is fasted Battery positive voltage
    A12 - Ground Ignition switch ON and driver door is opened No voltage
    A12 - Ground Ignition switch ON and driver door is closed Battery positive voltage
    A13 - Ground Ignition switch ON and passenger door is opened No voltage
    A13 - Ground Ignition switch ON and passenger door is closed Battery positive voltage
    A14 - Ground Constant Continuity
    A17 - Ground Constant Continuity
    A18 - Ground Ignition switch ON and fuel sender gauge float UP 0.3 - 0.6V
    A18 - Ground Ignition switch ON and fuel sender gauge float DOWN 4.9 - 6.9 V
    A19 - Ground Ignition switch ON and slowly move the wheel 4.5 - 5.5 V
    A20 - Ground Ignition switch ON and slowly move the wheel Battery positive voltage
    A21 - Ground Key unlock warning switch ON (Key is inserted) No voltage
    A21 - Ground Key unlock warning switch OFF (Key is removed) Battery positive voltage
    A22 - Ground Ignition switch ON and passenger's seat belt is unfastened No voltage
    A22 - Ground Ignition switch ON and passenger's seat belt is fasted Battery positive voltage
    B2 - Ground Ignition switch ON and rheostat light control volume CANCEL position No voltage
    B2 - Ground Ignition switch ON and rheostat light control volume maximum Battery positive voltage
    B4 - Ground Light control switch OFF No voltage
    B4 - Ground Light control switch TAIL or HEAD Battery positive voltage
    B5 - Ground Ignition switch ON and engine coolant temperature HOT (Red) warning light light up No voltage
    B5 - Ground Ignition switch ON and engine coolant temperature HOT (Red) warning light does not light up Battery positive voltage
    B6 - Ground Ignition switch ON and engine coolant temperature COOL (Blue) warning light light up No voltage
    B6 - Ground Ignition switch ON and engine coolant temperature COOL (Blue) warning light does not light up Battery positive voltage
    B7 - Ground Ignition switch ON and engine oil level warning light up No voltage
    A7 - Ground Ignition switch ON and engine oil level warning does not light up Battery positive voltage
    B8 - Ground Ignition switch ON and engine is stopped No voltage
    B8 - Ground Ignition switch ON and engine is running Battery positive voltage
    B11 - Ground Constant Continuity
    B12 - Ground Ignition switch OFF No voltage
    B12 - Ground Ignition switch ON Battery positive voltage
    B13 - Ground Ignition switch ON and engine is stopping No voltage
    B13 - Ground Ignition switch ON and engine is running Battery positive voltage
    B15 - Ground Ignition switch ON, parking brake lever is released and brake fluid level warning switch float DOWN No voltage
    B15 - Ground Ignition switch ON, parking brake lever is released and brake fluid level warning switch float UP Battery positive voltage
    B16 - Ground Ignition switch ON and turn signal switch OFF or RIGHT No voltage
    B16 - Ground Ignition switch ON and turn signal switch LEFT Battery positive voltage
    B17 - Ground Ignition switch ON and ABS is error No voltage
    B17 - Ground Ignition switch ON and ABS is normal Battery positive voltage
    B18 - Ground Ignition switch ON and passenger's seat belt warning light up No voltage
    B18 - Ground Ignition switch ON and passenger's seat belt warning does not light up Battery positive voltage

    If circuit is not as specified, wiring diagram and inspect the circuits connected to other parts.

  2. w/ Tachometer (Connector connected): INSPECT COMBINATION METER CIRCUIT 

    Connect the connector "A", "B" and "C" to the combination meter and inspect the wire harness side connectors from the back side as shown in the table.

    Fig 2: Identifying Combination Meter connector - With Tachometer
    G02825972Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    Combination Meter Circuit Inspection Table (With Tachometer)

    Tester connection Condition Specified condition
    A1 - Ground Ignition switch OFF No voltage
    A1 - Ground Ignition switch ON Battery positive voltage
    A2 - Ground Ignition switch ON and SRS indicator light light up No voltage
    A2 - Ground Ignition switch ON and SRS indicator does not light up Battery positive voltage
    A3 - Ground Ignition switch ON and engine coolant temperature HOT (Red) warning light light up No voltage
    A3 - Ground Ignition switch ON and engine coolant temperature HOT (Red) warning light does not light up Battery positive voltage
    A4 - Ground Ignition switch ON and engine coolant temperature COOL (Blue) warning light light up No voltage
    A4 - Ground Ignition switch ON and engine coolant temperature COOL (Blue) warning light does not light up Battery positive voltage
    A7 - Ground Light control switch OFF No voltage
    A7 - Ground Light control switch HI Battery positive voltage
    A8 - Ground Ignition switch ON and engine is stopped No voltage
    A8 - Ground Ignition switch ON and engine is running Battery positive voltage
    A9 - Ground Ignition switch ON and driver door is opened No voltage
    A9 - Ground Ignition switch ON and driver door is closed Battery positive voltage
    A10 - Ground Ignition switch ON and passenger door is opened No voltage
    A10 - Ground Ignition switch ON and passenger door is closed Battery positive voltage
    A11 - Ground Ignition switch ON and turn signal switch OFF or LEFT No voltage
    A11 - Ground Ignition switch ON and turn signal switch RIGHT Battery positive voltage
    A12 - Ground Ignition switch ON and ABS is error No voltage
    A12 - Ground Ignition switch ON and ABS is normal Battery positive voltage
    A13 - Ground Ignition switch ON and engine oil level warning light up No voltage
    A13 - Ground Ignition switch ON and engine oil level warning does not light up Battery positive voltage
    A14 - Ground Ignition switch ON and engine is stopping No voltage
    A14 - Ground Ignition switch ON and engine is running Battery positive voltage
    A15 - Ground Ignition switch ON and O/D off switch ON No voltage
    A15 - Ground Ignition switch ON and O/D off switch OFF Battery positive voltage
    A16 - Ground Ignition switch ON and driver's seat belt is unfastened No voltage
    A16 - Ground Ignition switch ON and driver's seat belt is fasted Battery positive voltage
    A17 - Ground Ignition switch ON and passenger's seat belt is unfastened No voltage
    A17 - Ground Ignition switch ON and passenger's seat belt is fasted Battery positive voltage
    A18 - Ground Ignition switch ON and passenger's seat belt warning light up No voltage
    A18 - Ground Ignition switch ON and passenger's seat belt warning does not light up Battery positive voltage
    A19 - Ground Ignition switch OFF, LOCK or ACC No voltage
    A19 - Ground Ignition switch ST Battery positive voltage
    A20 - Ground Ignition switch ON, parking brake lever is released and brake fluid level warning switch float DOWN No voltage
    A20 - Ground Ignition switch ON, parking brake lever is released and brake fluid level warning switch float UP Battery positive voltage
    A21 - Ground Ignition switch ON and turn signal switch OFF or RIGHT No voltage
    A21 - Ground Ignition switch ON and turn signal switch LEFT Battery positive voltage
    A22 - Ground Constant Battery positive voltage
    B1 - Ground Constant Continuity
    B2 - Ground Ignition switch ON and rheostat light control volume CANCEL position No voltage
    B2 - Ground Ignition switch ON and rheostat light control volume maximum Battery positive voltage
    B5 - Ground Ignition switch ON and window washer level warning switch float DOWN No voltage
    B5 - Ground Ignition switch ON and window washer level warning switch float UP Battery positive voltage
    B8 - Ground Constant Continuity
    B9 - Ground Constant Continuity
    B10 - Ground Light control switch OFF No voltage
    B10 - Ground Light control switch TAIL or HEAD Battery positive voltage
    B12 - Ground Ignition switch ON and fuel sender gauge float UP 0.3 - 0.6 V
    B12 - Ground Ignition switch ON and fuel sender gauge float DOWN 4.9 - 6.9 V
    B13 - Ground Ignition switch ON and slowly move the wheel Battery positive voltage
    B14 - Ground Ignition switch ON and slowly move the wheel 4.5 - 5.5 V
    B15 - Ground Ignition switch ON and engine is stopping No voltage
    B15 - Ground Ignition switch ON and engine is running Battery positive voltage
    B16 - Ground Key unlock warning switch ON (Key is inserted) No voltage
    B16 - Ground Key unlock warning switch OFF (Key is removed) Battery positive voltage
    B17 - Ground Ignition switch OFF No voltage
    B17 - Ground Ignition switch ON Battery positive voltage
    B18 - Ground Constant Battery positive voltage
    C4 - Ground Ignition switch ON and trip switch (ODO/TRIP/RESET) ON 4.5 - 5.5V
    C4 - Ground Ignition switch ON and trip switch (ODO/TRIP/RESET) OFF No voltage
    C5 - Ground Ignition switch ON and trip switch (TAIL CANCEL) ON 4.5 - 5.5 V
    C5 - Ground Ignition switch ON and trip switch (TAIL CANCEL) OFF No voltage
    C6 - Ground Constant Continuity

    If circuit is not as specified, wiring diagram and inspect the circuits connected to other parts.

  3. INSPECT SPEEDOMETER ON-VEHICLE 

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

    HINT:

    Tire wear and tire over or under inflation will increase the indication error.

    Speedometer Inspection Table

    USA, Puerto Rico (mph) CANADA (km/h)
    Standard indication: Allowable range Standard indication: Allowable range
    20: 19 - 22 20: 18 - 23
    40: 39 - 42.5 40: 40 - 44
    60: 59.5 - 63.5 60: 60 - 64.5
    80: 79.5 - 84 80: 80 - 85
    100: 100 - 105 100: 100 - 105
      120: 120 - 125.5
      140: 140 - 146
      160: 160 - 167

    If error is excessive, replace the speedometer.

  4. INSPECT VEHICLE SPEED SENSOR OPERATION 
    1. Connect the positive (+) lead from battery to terminal 1 and negative (-) lead to terminal 2.
    2. Connect the positive (+) lead from tester to terminal 3 and the negative (-) lead to terminal 2.
    3. Rotate the shaft.
    4. Check that there is voltage change from approx. 0 V to 11 V or more between terminals 2 and 3.

    HINT:

    The voltage change should be 4 times for every revolution of the speed sensor shaft.

    If operation is not as specified, replace the sensor.

    Fig 3: Inspecting Speed Sensor Operation
    G02825973Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  5. 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.
      • When removing or installing the tachometer, be careful not to drop or subject it to heavy shocks.
    2. Compare the tester and tachometer indications.

    DC 13.5 V 25°C at (77°F) 

    Tachometer/On-Vehicle Inspection Table

    Standard indication Allowable range
    700 630 - 770
    1,000 900 - 1,100
    2,000 1,850 - 2,150
    3,000 2,800 - 3,200
    4,000 3,000 - 4,200
    5,000 4,800 - 5,200
    6,000 5,850 - 6,250
    7,000 6,700 - 7,300
  6. INSPECT FUEL RECEIVER GAUGE OPERATION 
    1. Disconnect the connector from the sender gauge.
    2. Turn the ignition switch ON, check that the receiver gauge needle indicates EMPTY.
      Fig 4: Inspecting Fuel Receiver Gauge
      G02825974Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Connect terminals 2 and 3 on 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 the receiver gauge needle moves towards the full side.
      5. Fig 5: Connecting Terminals 2 And 3 On Wire Harness Side Connector Through A 3.4 W Test Bulb
      G02825975Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

    HINT:

    Because of the silicon oil in the gauge, it will take a short time for needle to stabilize.

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

  7. INSPECT FUEL SENDER GAUGE RESISTANCE 

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

    Fuel Sender Gauge Resistance Table

    Float position mm (in.) Resistance (Ω)
    F: Approx. 83.8 (3.30) +/- 3 (0.12) Approx. 4.0 +/- 1
    1/2: Approx. 18.9 (0.74) +/- 3 (0.12) Approx. 55.0 +/- 3
    E: Approx. 55.2 (2.17) +/- 3 (0.12) Approx. 107.0 +/- 1

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

    Fig 6: Inspecting Fuel Sender Gauge
    G02825976Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  8. INSPECT ENGINE COOLANT TEMPERATURE RECEIVER GAUGE WARNING LIGHT 
    1. Disconnect the connector from the sender gauge.
    2. Turn the ignition switch ON and check that the COOL warning light lights up.
      Fig 7: Inspecting COOL Warning Light Operation
      G02825977Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    3. Ground terminal 2 on the wire harness side, and check that the HOT warning light lights up.

    If operation is as specified, replace the sender gauge.

    Then recheck the system.

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

    Fig 8: Inspecting HOT Warning Light Operation
    G02825978Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  9. INSPECT ENGINE COOLANT TEMPERATURE SENDER GAUGE RESISTANCE 

    Connect the wire harness as shown in the illustration, and adjust the ammeter pointer to indicate "0" using the slide rheostat, then read the rheostat indication.

    Coolant Temperature Sender Gauge Inspection Table

    Temperature °C (°F) Resistance (Ω)
    50 (122.0) 160 - 240
    120 (248.0) 17.1 - 21.2

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

    Fig 9: Inspecting Engine Coolant Temperature Sender Gauge
    G02825979Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  10. INSPECT LOW OIL PRESSURE WARNING LIGHT 
    1. Disconnect the connector from the warning switch and ground terminal on the wire harness side connector.
    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.

    Fig 10: Inspecting Low Oil Pressure Warning Light
    G02825980Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  11. INSPECT LOW OIL PRESSURE SWITCH CONTINUITY 
    1. Disconnect the connector from the switch.
    2. Check that continuity exists between terminal and ground with the engine stopped.
    3. Check that no continuity exists between terminal and ground with the engine running.

    HINT:

    Oil pressure should be over 24.5 kPa (0.25 kgf/cm2 , 3.55 psi).

    If operation is not as specified, replace the switch.

    Fig 11: Inspecting Low Oil Pressure Switch
    G02825981Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  12. INSPECT BRAKE 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.
    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.

    Fig 12: Inspecting Brake Warning Light
    G02825982Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  13. 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).
    4. Use syphon, 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.

    Fig 13: Inspecting Brake Fluid Level Warning Switch
    G02825983Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  14. INSPECT PARKING BRAKE SWITCH CONTINUITY 
    1. Check that continuity exists between the terminal and switch body with the switch ON (switch pin released).
    2. Check that no continuity exists between the 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.

    Fig 14: Inspecting Parking Brake Switch
    G02825984Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  15. INSPECT WINDOW WASHER LEVEL WARNING LIGHT 
    1. Disconnect the connector from the warning switch and ground terminal on the wire harness side connector.
    2. 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.

    Fig 15: Inspecting Window Washer Level Warning Light
    G02825985Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  16. INSPECT WINDOW WASHER LEVEL WARNING SWITCH CONTINUITY 
    1. Check that there is no continuity between the terminals with the switch OFF (float up).
    2. Check that there is continuity between the terminals with the switch ON (float down)

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

    Fig 16: Inspecting Window Washer Level Warning Switch
    G02825986Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  17. 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.

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

    Fig 17: Inspecting Open Door Warning Light
    G02825987Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  18. INSPECT SEAT BELT WARNING LIGHT 
    1. Disconnect the connector from the buckle switch and ground terminal on the wire harness side connector.
    2. 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.

    Fig 18: Inspecting Seat Belt Warning Light
    G02825988Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  19. INSPECT BUCKLE SWITCH CONTINUITY 
    1. Check that continuity exists between the terminals on the switch side connector with the switch ON (belt fastened).
    2. Check that no continuity exists between the terminals on the switch side connector with the switch OFF (belt unfastened).

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

    Fig 19: Inspecting Buckle Switch
    G02825989Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  20. Passenger's 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.

    If operation is not as specified, replace the sensor.

    Fig 20: Inspecting Seat Belt Warning Occupant Detection Sensor
    G02825990Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  21. INSPECT LIGHT CONTROL RHEOSTAT 
    1. Turn the rheostat knob OFF, and check that there is no continuity between terminals. (Rheostat knob turned to fully counterclockwise.)
    2. Gradually, turn the rheostat knob from the dark side to bright side, and check that the resistance decreases from 10 to 0 Ω (Rheostat knob turned to clockwise.)

    If operation is not as specified, replace the rheostat.

    Fig 21: Inspecting Light Control Rheostat
    G02825991Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
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