Throttle Position Sensor: Adjustments
Prior to making adjustments to the Idle Speed, be sure:^ Engine coolant has reached 185-195~F (85-95~C)
^ Lights, cooling fan, and electrical accessories are OFF.
^ Transaxle is in PARK or NEUTRAL
^ Steering wheel is in a straight ahead position.
^ Parking Brake is applied.
1. Loosen the tension of the accelerator cable.
Accelerator Cable Adjustment:
2. Connect a tachometer.
Verifying TPS Output To The Control Unit:
3. Connect a digital voltmeter between the illustrated terminals of the MPI Control Unit.
4. Turn ON the ignition switch (without starting the engine) for 15 seconds or more.
5. Turn OFF the ignition switch.
ISC Connector:
6. Disconnect the electrical connectors for the Idle Speed Control Servo, and lock the idle Speed Control Plunger at the initial position.
Idle Speed Adjustment Screws:
7. Back out the Fixed SAS.
8. Start the engine and let it idle.
9. Check to ensure that the engine is running at the standard basic idle speed.
Refer to SPECIFICATIONS/MECHANICAL.
Idle Speed Adjustment Screws:
10. If the engine speed does not meet specifications, use a hexagon socket and driver to adjust the Idle Speed Adjusting Screw.
11. Turn in the Fixed SAS until the engine speed rises. Then back out the Fixed SAS until the touch point is found.
NOTE: The touch Point is the where the engine speed does not fall any longer.
12. Back out the Fixed SAS an additional half turn from the touch point.
13. Stop the engine.
14. Turn ON the ignition switch (without starting the engine), and verify output voltage from the Throttle Position Sensor (TPS) is between 0.48-0.52 volts.
Adjustment OF The TPS:
15. If the voltage is not within specification, adjust the TPS by loosening the TPS mounting screws and rotating the TPS. After adjustment tighten the screws firmly.
NOTE: Clock-wise rotation of the TPS will increase the output voltage.
16. Set the ignition switch to the OFF position.
17. Adjust the freeplay of the accelerator cable.
18. Reconnect the connectors of the Idle Speed Control Servo.
19. Remove the voltmeter.
20. Start the engine and check that the engine idle speed is at CURB idle.
Refer to SPECIFICATIONS/MECHANICAL.