Component Tests and General Diagnostics

ON-VEHICLE INSPECTION

1. INSPECT SPEEDOMETER
a. Check the operation.
1. Using a speedometer tester, inspect the speedometer for acceptable indication error and check the operation of the odometer.




Reference: km/h (Canada)




Reference: MPH (U.S.)

NOTE: Tire wear and over or under inflation will affect the indication error.




2. Check the deflection width of the speed meter indicator.
Reference: Below 0.5 km/h (0.3 mph)

2. INSPECT OUTPUT SIGNAL OF VEHICLE SPEED
a. Check for the signal.
1. While driving the vehicle at the speed of 10 km/h, check the voltage between the terminal C10-36 of the combination meter assembly and the body ground.
Standard: Fluctuation between 10 to 14 V or less is repeated 7 times within 1 sec.

NOTE: Check it with the ignition switch ON and the connector connected.

3. INSPECT TACHOMETER
a. Check the operation
1. Connect the tune-up test 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 result of the test with standard indication.
DC 13.5 V, 25 °C at (77 °F)