Component Tests and General Diagnostics
ON-VEHICLE INSPECTION1. INSPECT SPEEDOMETER
a. Check the operation.
1. Using a speedometer tester (calibrated chassis dynamometer), inspect the speedometer indication according to the table and check the operation of the odometer.
NOTE: Tire wear and over or under inflation will cause errors.
2. Check the deviation from the acceptable range of the speedometer indication.
Reference: Below 0.5 km/h (0.3 mph)
2. INSPECT OUTPUT OF VEHICLE SPEED
a. Check the output signal waveform.
1. Remove the combination meter assembly.
2. Connect the oscilloscope to terminal C7-36 (+S) and body ground.
3. Start the engine.
4. Check the signal waveform according to the condition(s) in the table.
OK: As shown in the illustration.
HINT: As vehicle speed increases, the cycle of the signal waveform narrows.
3. INSPECT TACHOMETER
a. Check the operation.
1. Connect a tune-up tachometer and start the engine.
NOTE:
- Reversing the connection of the tachometer will damage the transistors and the insides of the diodes.
- When removing or installing the tachometer, be careful not to drop or subject it to heavy shocks.
2. Compare the test results with the tachometer indication.
4. INSPECT FUEL RECEIVER GAUGE
a. Disconnect the connector from the sender gauge.
b. Turn the ignition switch to the ON position, then check the position of the receiver gauge needle.
OK: Needle position is on (EMPTY).
c. Connect terminals 2 and 3 on the wire harness side connector of the fuel sender gauge.
d. Turn the ignition switch to the ON position, then check the position of the receiver gauge needle.
OK: Needle position is on (FULL).
5. INSPECT FUEL LEVEL WARNING LIGHT
a. Disconnect the connector from the sender gauge.
b. Turn the ignition switch to the ON position, then check that the fuel level needle indicates EMPTY and the fuel level warning light comes on.
OK: Fuel level warning light comes on.
6. INSPECT OIL PRESSURE WARNING LIGHT
a. Disconnect the connector from the low oil pressure switch.
b. Turn the ignition switch to the ON position.
c. Ground the terminal of the wire harness side connector, then check the low oil pressure warning light.
OK: Low oil pressure warning light comes on.
7. INSPECT BRAKE WARNING LIGHT
a. Inspect the parking brake warning light.
1. Disconnect the connector from the parking brake switch.
2. Turn the ignition switch to the ON position.
3. Ground the terminal of the wire harness side connector, then check the parking brake warning light.
OK: Brake warning light comes on.
b. Inspect the brake fluid level warning light.
1. Disconnect the connector from the brake fluid level warning switch.
2. Turn the ignition switch to the ON position.
3. Connect a terminal to the other terminal of the wire harness side connector, then check the brake fluid level warning switch.
OK: Brake warning light comes on.
8. INSPECT BRAKE FLUID LEVEL WARNING SWITCH
a. Remove the reservoir tank cap and strainer.
b. Disconnect the connector.
c. Measure the resistance between the terminals.
Standard resistance: Float up (switch off): 10 kohms or higher
d. Use a syphon, etc. to take fluid out of the reservoir tank.
e. Measure the resistance between the terminals.
Standard resistance: Float down (switch on): Below 1 ohm
f. Pour the fluid back in the reservoir tank.
g. Reconnect the connector.
9. INSPECT WASHER LEVEL WARNING SWITCH
a. Disconnect the connector from the washer level warning switch.
b. Turn the ignition switch to the ON position.
c. Ground the terminal of the wire harness side connector, then check the washer level warning light.
OK: Washer level warning light comes on.
10. OIL MAINTENANCE INDICATOR RESETTING PROCEDURE
a. Turn the ignition switch to the ON position.
b. Set the display window to Trip A.
c. Turn the ignition switch off.
d. Turn the ignition switch to the ON position while pressing and holding the reset switch. Hold the reset switch for 5 seconds or more.
e. Reset procedure is completed after 5 seconds.
HINT:
- If the ignition switch is turned off during reset procedure, reset mode is canceled and LCD goes off.
- If the reset switch is turned off during the reset procedure, reset mode is canceled and the display shows the condition prior to the reset procedure.