Component Tests and General Diagnostics

ON-VEHICLE INSPECTION

1. CHECK SPEEDOMETER

a. Check operation.




1. Using a speedometer tester, check that the speedometer reading is within the allowable range shown in the table.Also, check for proper operation of the odometer.

NOTE: Do not use worn, underinflated or overinflated tires, as the speedometer reading will be inaccurate.

2. Check the deflection width of the speedometer indicator.
Reference:Allowable range ±0.5 km/h (0.3 mph)
If the result is not as specified, the speedometer may have a malfunction.




2. CHECK OUTPUT SIGNAL OF VEHICLE SPEED
a. Check the output signal waveform.
1. Remove the combination meter, but do not disconnect the connector.




2. Using an oscilloscope, check the waveform of the combination meter.
OK: Refer to the illustration.

HINT: As vehicle speed increases, the wavelength shortens.

3. CHECK TACHOMETER

a. Check operation.
1. Connect a tune-up test tachometer, and start the engine.

NOTE:
- Do not reverse the connections of the tachometer. This will damage its transistors and diodes.
- When removing or installing the tachometer, be careful not to drop or strike it.




2. Compare the test tachometer values and vehicle tachometer values under the following conditions:
- Vehicle battery voltage is 13.5 V
- Ambient temperature is 25 degree C (77 degree F)
If the result is not as specified, the tachometer may have a malfunction.




4. CHECK FUEL SENDER GAUGE ASSEMBLY
a. Disconnect the F9 gauge connector.
b. Turn the ignition switch ON, and then check the position of the receiver gauge needle.
OK:Fuel receiver gauge indicates E

c. Connect terminals 2 and 3 of the wire harness side connector.
d. Turn the ignition switch ON, and then check the position of the receiver gauge needle.
OK:Fuel receiver gauge indicates F
If the result is not as specified, the combination meter may have a malfunction.




5. CHECK FUEL LEVEL WARNING LIGHT
a. Disconnect the F9 pump and gauge connector.
b. Turn the ignition switch ON, and then check that the fuel receiver gauge indicates E and that the fuel level warning light turns on.
OK:Fuel level warning light turns on
If the result is not as specified, the combination meter may have a malfunction.




6. CHECK ENGINE COOLANT TEMPERATURE RECEIVER GAUGE ASSEMBLY
a. Disconnect the E2 gauge connector.
b. Turn the ignition switch ON, and check the position of the receiver gauge needle.
OK:Needle position is on (COOL).

c. Connect between terminals of the wire harness side connector, and then check the position of the receiver gauge needle.
OK:
Needle position is on (HOT).




7. CHECK LOW OIL PRESSURE WARNING LIGHT
a. Disconnect the E3 switch connector.
b. Connect the E3-1 terminal of the wire harness side connector to the body ground.
c. Turn the ignition switch ON, and then check that the low oil pressure warning light turns on.
OK:Low oil pressure warning light turns on
If the result is not as specified, the combination meter may have a malfunction.




8. CHECK BRAKE WARNING LIGHT
a. Check the parking brake warning light.
1. Disconnect the P6 switch connector.
2. Connect the P6-1 terminal of the wire harness side connector to the body ground.
3. Turn the ignition switch ON, and then check that the warning light turns on.
OK:Warning light turns on.




b. Check the brake fluid level warning light.
1. Disconnect the B2 switch connector.
2. Connect the B2-1 and B2-2 terminals of the wire harness side connector.
3. Turn the ignition switch ON, and then check that the warning light turns on.
OK:Warning light turns on.
If the result is not as specified, the combination meter may have a malfunction.