Component Tests and General Diagnostics
INSPECTION1. 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.
Connector View:
Pinouts (Part 1):
Pinouts (Part 2):
Pinouts (Part 3):
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.
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.
If error is excessive, replace the speedometer.
4. INSPECT VEHICLE SPEED SENSOR OPERATION
a. Connect the positive (+) lead from battery to terminal 1 and negative (-) lead to terminal 2.
b. Connect the positive (+) lead from 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 4 times for every revolution of the speed sensor shaft.
If operation is not as specified, replace the sensor.
5. 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 25 °C at (77°F)
6. 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 2 and 3 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 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.
7. INSPECT FUEL SENDER GAUGE RESISTANCE
Measure the resistance between terminals 2 and 3 for each float position.
If resistance value is not as specified, replace the sender gauge.
8. INSPECT ENGINE COOLANT TEMPERATURE RECEIVER GAUGE WARNING LIGHT
a. Disconnect the connector from the sender gauge.
b. Turn the ignition switch ON and check that the COOL warning light lights up.
c. 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.
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.
If resistance value is not as specified, replace the engine coolant temperature sender gauge.
10. INSPECT LOW OIL PRESSURE WARNING LIGHT
a. Disconnect the connector from the warning switch and ground terminal on the wire harness side connector.
b. Turn the ignition switch ON and check that the warning light lights up.
If the warning light does not light up, test the bulb.
11. INSPECT LOW 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 kgf/sq.cm , 3.55 psi).
If operation is not as specified, replace the switch.
12. 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 wire harness side of the level warning switch connector.
d. Start the engine, check that the warning light lights up.
If the warning light does not light up, test the bulb or wire harness.
13. 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 syphon, etc. 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 the switch.
14. INSPECT PARKING BRAKE SWITCH CONTINUITY
a. Check that continuity exists between the terminal and switch body with the switch ON (switch pin released).
b. 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.
15. INSPECT WINDOW WASHER LEVEL WARNING LIGHT
a. Disconnect the connector from the warning switch and ground terminal on the wire harness side connector.
b. 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.
16. INSPECT WINDOW WASHER LEVEL WARNING SWITCH CONTINUITY
a. Check that there is no continuity between the terminals with the switch OFF (float up).
b. 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.
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.
18. INSPECT SEAT BELT WARNING LIGHT
a. Disconnect the connector from the buckle switch and ground terminal on the wire harness side connector.
b. 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.
19. INSPECT BUCKLE SWITCH CONTINUITY
a. Check that continuity exists between the terminals on the switch side connector with the switch ON (belt fastened).
b. 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.
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.
21. INSPECT LIGHT CONTROL RHEOSTAT
a. Turn the rheostat knob OFF, and check that there is no continuity between terminals. (Rheostat knob turned to fully counterclockwise.)
b. Gradually, turn the rheostat knob from the dark side to bright side, and check that the resistance decreases from 10 to 0 ohm (Rheostat knob turned to clockwise.)
If operation is not as specified, replace the rheostat.