Component Tests and General Diagnostics

1. 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.

If error is excessive, replace the speedometer.




2. INSPECT VEHICLE SPEED SENSOR OPERATION
a. Connect the positive (+) lead from the battery to terminal 1 and negative (-) lead to terminal 2.
b. Connect the positive (+) lead from the tester to terminal 3 and the negative (-) lead to terminal 2.
c. Rotate the shaft.
d. 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 performed 4 times for every revolution of the speed sensor shaft.

If operation is not as specified, replace the sensor.










3. INSPECT SPEEDOMETER RESISTANCE
Measure the resistance between terminals while fixing pointer to the stopper.
If resistance value is not as the specified, replace the meter.

4. INSPECT TACHOMETER/ON-VEHICLE
a. 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.




b. Compare the tester and tachometer indications.
DC 13.5 V 20°C at (77°F)







5. INSPECT TACHOMETER RESISTANCE
Measure the resistance between terminals with fixing pointer to the stopper.
If resistance value is not as specified, replace the meter.




6. INSPECT VOLT GAUGE SYSTEM
Measure the resistance between terminals A and B.

Resistance: Approx. 347 Ohms

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

7. INSPECT FUEL RECEIVER GAUGE OPERATION




a. Disconnect the connector from the sender gauge.
b. Turn the ignition switch ON, check that the receiver gauge needle indicates EMPTY.




c. Connect terminals 1 and 3 on the wire harness side connector through a 3.4 watts test bulb.
d. Turn the ignition switch ON, check that the bulb lights up and the receiver gauge needle moves towards the full side.

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.

8. INSPECT FUEL RECEIVER GAUGE RESISTANCE
Measure the resistance between terminals.







w/ Tachometer







w/o Tachometer

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







9. INSPECT FUEL SENDER GAUGE RESISTANCE
Measure the resistance between terminals 1 and 2 for each float position.
If resistance value is not as specified, replace the main sender gauge.




10. INSPECT FUEL LEVEL WARNING LIGHT
a. Disconnect the connector from the sender gauge.
b. Connect terminals 1 and 3 on the wire harness side connector.
c. 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.

11. INSPECT FUEL LEVEL WARNING SWITCH




a. Apply battery positive voltage between terminal 1 and 3, and through a 3.4 W test bulb, and check that the bulb lights up.

HINT: It will take a short time for bulb to light up.




b. Submerge the switch in fuel, and check that the bulb goes out.
If operation is not as specified, replace the sender gauge.

12. INSPECT ENGINE COOLANT TEMPERATURE RECEIVER GAUGE OPERATION




a. Disconnect the connector from the sender gauge.
b. Turn the ignition switch ON, check that the receiver gauge needle indicates COOL.




c. Ground terminal on the wire harness side connector through a 3.4 W test bulb.
d. Turn the ignition switch ON, 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.

13. INSPECT ENGINE COOLANT TEMPERATURE RECEIVER GAUGE RESISTANCE
Measure the resistance between terminals.







w/ Tachometer







w/o Tachometer

HINT: Connect the test leads so that the current from the ohmmeter can flow according to the above order. This circuit includes the diode.

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







14. 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.
If resistance value is not as specified, replace the engine coolant sender gauge.







15. INSPECT OIL PRESSURE GAUGE RESISTANCE
Measure the resistance between terminals A and B.
If resistance value is not as specified, replace the receiver gauge.




16. INSPECT OIL PRESSURE SWITCH CONTINUITY
a. Disconnect the connector from the switch.
b. Check that continuity exists between terminal and ground with the engine stopped.
c. Check that no continuity exists between terminal and ground with the engine running.

HINT: Oil pressure should be over 24.5 kPa (0.25 kg/sq.cm, 3.55 psi).

If operation is not as specified, replace the switch.




17. INSPECT BRAKE WARNING LIGHT
a. Disconnect the connector from the brake fluid warning switch
b. Release the parking brake pedal.
c. Connect the terminals on the harness side of the level Warning switch connector.
d. Start the engine, check that the warning light lights up.
If warning light does not light up, test the bulb or wire harness.




18. INSPECT BRAKE FLUID LEVEL WARNING SWITCH CONTINUITY
a. remove the reservoir tank cap and strainer.
b. Disconnect the connector.
c. Check that no continuity exists between the terminals with the switch OFF (float up).
d. Use siphon, et c. to take fluid out of the reservoir tank.
e. Check that continuity exists between the terminals with the switch ON (float down)
f. Pour the fluid back in the reservoir tank. If operation is not as specified, replace switch.




19. INSPECT PARKING BRAKE SWITCH CONTINUITY
a. Check that there is continuity terminals with the switch ON (switch pin released).
b. Check that there is no continuity between terminals with the switch OFF (switch pin pushed in).
If operation is not as specified, replace the switch.




20. INSPECT WASHER LEVEL WARNING LIGHT
a. Disconnect the connectors from the level warning switch.
b. Connect terminals on the wire harness side connector of the level warning switch connector.
c. Turn the ignition switch ON, check that the warning light come on.
If the warning light does not light up, test the bulb.




21. INSPECT WASHER LEVEL SWITCH CONTINUITY
a. Check that there is no continuity between terminals with switch OFF (float up).
b. Check that there is continuity between terminals with the switch ON (float down).
If operation is not as specified, replace the switch.




22. INSPECT DRIVER'S SEAT BELT WARNING LIGHT
a. Disconnect the connector B from the combination meter.
b. Connect the negative (-) lead from the battery to terminal 9.
c. 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.




23. Bench Type and Passenger Side:
INSPECT BUCKLE SWITCH CONTINUITY
a. Check that continuity exists between terminals 1 and 2 on the switch side connector with the switch ON (belt fastened).
b. Check that no continuity exists between terminal 1 an 2 on the switch side connector with the switch OFF (belt unfastened).
If operation is not as specified, replace the seat belt inner.




24. w/O Bench Type (Driver Side):
INSPECT BUCKLE SWITCH CONTINUITY
a. Check that continuity exists between terminals 3 and 4 on the switch side connector with the switch ON (belt fastened).
b. Check that no continuity exists between terminal 3 an 4 on the switch side connector with the switch OFF (belt unfastened).
If operation is not as specified, replace the seat belt inner.




25. Separate Type (w/ Power Seat):
INSPECT BUCKLE SWITCH CONTINUITY
a. Check that continuity exists between terminals 1 and 2 on the switch side connector with the switch ON (belt fastened).
b. Check that no continuity exists between terminal 1 an 2 on the switch side connector with the switch OFF (belt unfastened).
If operation is not as specified, replace the seat belt inner.




26. 2UZ-FE:
INSPECT "4Lo/4Hi", 4WD" INDICATOR LIGHT
a. Remove the center cluster finish panel.
b. Disconnect the connectors from the center cluster integration.
c. "4Lo" indicator:
Ground terminal 3 on the wire harness side connector.
d. "4Hi" indicator:
Ground terminal 2 on the wire harness side connector.




27. 5VZ-FE
INSPECT "4Lo/4Hi", 4WD" INDICATOR LIGHT
a. Disconnect the connectors from the ADD actuator.
b. "4WD" indicator:
Ground terminal 3 on the wire harness side connector.
c. Turn the ignition switch ON, check that the warning light lights up.
If the warning light does not light up, inspect the bulb or wire harness.




28. INSPECT LIGHT CONTROL RHEOSTAT
a. Connect terminals 1 and 3 through a 3.4 W test bulb.
b. Connect the positive (+) lead from the battery to terminal 1 and the negative (-) lead to terminal 2.
c. Turn the rheostat knob to fully counterclockwise, check that the test bulb goes out.
d. Gradually turn the rheostat knob to clockwise, check that the test bulb brightness changes from dark to bright.
If operation is not as specified, replace the rheostat.




29. INSPECT OPEN DOOR WARNING LIGHT
a. Disconnect the connector from the door courtesy switch and ground terminal on the wire harness side connector.
b. Turn the ignition switch ON, check that the warning light lights up.
If the warning light does not light up, test the bulb.




30. 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.




31. INSPECT PASSENGER SEAT BELT WARNING LIGHT
a. Remove the center cluster finish panel.
b. Disconnect the connectors from the center cluster integration.
c. Connect the positive (+) lead from the battery to the terminal 4 and negative (-) lead terminal 16, and check that the warning light lights UP.
If the warning light does not light up, inspect the bulb or wire harness.