TESTING

Using an ohmmeter, check that continuity exists between terminals A and C when the throttle is fully closed and that no continuity exists when the throttle is opened.
Insert a feeler gauge (thickness gauge) of 0.0217 in. (0.55mm) between the stopper screw on the throttle chamber and the stopper (this corresponds to the throttle opening of 1.5 degrees). Ensure that continuity exists between terminals A and C.
Insert a feeler gauge (thickness gauge) of 0.0362 in. (0.92mm) between the stopper screw on throttle chamber and the stopper (this corresponds to a throttle opening of 2.5 degrees). Ensure that continuity exists between terminals A and C.

Disconnect the TP sensor harness.
Measure the resistance with an ohmmeter between terminals 2 and 3.
1. With the throttle fully closed, the resistance should be 12 kilo-ohms.
2. With the throttle fully opened, the resistance should be 5 kilo-ohms.
The resistance should change smoothly as the throttle plates are moved open and closed.
If the TP sensor checks out satisfactorily, check the TP sensor harness for continuity and ground path.
Check the idle switch by disconnecting it from the ECU harness.
Connect an ohmmeter between terminals 1 and 2.
1. With the throttle fully closed, the idle switch should be 0 ohms.
2. With the throttle fully opened, the idle switch resistance should be 1 mega-ohm or more.

Unplug the throttle sensor and measure the resistance between terminals 1 and 2.
The resistance should be 6–18 kilo-ohms. Replace the sensor if the resistance measurement is out of range.
Measure the resistance between terminals 1 and 3. It should be:
- 5.8–17.8 kilo-ohms with the throttle closed
- 1.5–5.1 kilo-ohms with the throttle open
The resistance must change smoothly through its entire range. If the resistances are either out of range or the resistance change is not smooth, replace the throttle sensor.