Throttle Position Sensor: Adjustments

NOTE: The manufacturer recommends adjusting the Throttle Position Sensor using the ECI Checker tool # MD 998451. The following procedure can be used instead of using the ECI Checker tool.



1. Loosen the accelerator cable adjustment.

Adjustment Screws:

2. Loosen the speed adjusting screw No.1 (SAS-1) and No.2 (SAS-2) sufficiently to close the throttle valve completely. Record the number of turns loosened.

Fast Idle Cam:

At this time, the fast idle control should have been released (the lever not resting on the fast idle cam).

Throttle Position Sensor (Typical):

3. Connect voltmeter (digital type) between sensor ground (GY) and sensor output (YR) of TPS connector pins.
NOTE: Do not disconnect the TPS connector from the chassis harness.
4. Turn the ignition switch to ON. (Do Not Start engine.)
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 is 700-900 rpm in NEUTRAL or PARK.