Function test
1. Disconnect the air tube from the throttle assembly.
2. Turn on the ignition.
3. Make sure that the throttle opens according to the amount of pressure on the accelerator pedal.
Checking the resistance of the servo winding
1. Disconnect the throttle servo connector.
2. Measure the resistance between the throttle servo connector pins (pic. 6.31).
Pic. 6.31. Throttle servo location
Resistance between pins 1-3 and 2-4 at 20°C: 1.35-1.65 Ohm
3. Make sure that none of the connector pins is shorted to the throttle body.