Throttle Valve Potentiometer

The throttle valve potentiometer provides the Digifant control unit with information about throttle position. The control unit uses the signal for idle stabilization, deceleration fuel shut-off, acceleration enrichment, and as a substitute engine load signal if the air flow sensor fails. The potentiometer is located at the bottom of the throttle housing. See Fig. 8-2.

Fig. 8-2.

Digifant I throttle valve potentiometer (arrow).

To test the potentiometer first disconnect the harness connector. Using a digital multimeter, check that the resistance between potentiometer terminals 1 and 2 varies continuously and smoothly as the throttle is opened. If the throttle valve potentiometer is replaced, reset the control unit as described in 8.2 Resetting Digifant I Control Unit.