Throttle Position Sensor: Adjustments

To adjust the Throttle Position Sensor, proceed as follows:

Accelerator Cable Adjustment:

1. Loosen the accelerator cable.

Adjustment Screw Locations:

2. Loosen the speed adjusting screws SAS 1 and SAS 2 sufficiently to close the throttle valve completely. Record the number of turns loosened for each screw (to facilitate return to the initial setting).
NOTE: Turning the screw counter clockwise closes the valve. At this time, the fast idle control should have been released (the lever not resting on the fast idle cam).

TPS Connector, Terminal Identification:

3. Connect voltmeter (digital type) between 2 and 3 of TPS connector pins.
NOTE: Do not disconnect the TPS connector from the chassis harness.
4. Turn the ignition switch to ON. (Engine will not start.)
5. Measure the TPS output voltage.

TPS output voltage: 250 mV

Throttle Position Sensor Location:

6. If the output voltage is not correct, loosen the TPS mounting screws and turn the TPS body to adjust to specification.
NOTE: Turning the TPS body clockwise increases the output voltage.
7. Turn the ignition switch to OFF.
8. Tighten SAS 1 and SAS 2 by the same number of turns as loosened in step (2) to return them to initial state.
9. Adjust free play of the accelerator cable. Turn the accelerator adjusting nut to the point where the throttle lever just starts moving, then back off one turn and secure the lock nut.
10. Start the engine and check that the idle speed as specified.