Throttle Position Sensor: Adjustments

This adjustment is necessary to provide good driveability and is required after the ISC servo, TPS, mixing body or throttle body have been removed or replaced during routine service.

Idle Speed Adjustments:

1. START and run engine at fast idle to bring coolant to normal operating temperature (185 to 205°F), then turn ignition OFF.
2. Ensure all lights, accessories and electric cooling fan are OFF, then place transaxle in Neutral position.
3. Place steering wheel in a straight ahead position.
4. Loosen accelerator cable, then connect a suitable tachometer to engine according to manufacturers' instructions.
5. Turn ignition switch to Lock position, then disconnect TPS wiring connector.
6. Jump connector using suitable jumper wires, ensuring not to allow wires to contact each other.
7. Using a suitable digital voltmeter, connect leads to jumper wires representing green wire with black stripe and green wire with red stripe.
8. Attach a suitable tachometer to engine according to manufacturers' instructions.
9. Turn ignition switch ON, but do not start engine, and hold in position for approximately 15 seconds to check that ISC motor is in idle or initial position. Initial position represents idle opening or .9 volts of motor position sensor output voltage.
10. Turn ignition switch to Lock position, then disconnect ISC servo connector. This ensures that the ISC motor is in initial position.

Idle Speed Adjustments:

11. Open throttle valve halfway two or three times, then release to allow it to snap closed. Loosen fixed SAS.
12. START and idle engine, then check idle speed. Idle speed should be 700 rpm ± 100 rpm. If idle speed is not as specified, adjust ISC adjusting screw until specified idle speed is obtained. When rotating ISC adjusting screw, use the appropriate tool and only make adjustments to specifications in the tightening direction.
13. Tighten fixed SAS until engine speed increases, then loosen until engine speed no longer decreases (touch point). Tighten one full turn from touch point, then stop engine.
14. Turn ignition switch ON, then check TPS output voltage. Voltage should be .48 -.52 volts. If voltage is not as specified, loosen TPS mounting screw, then rotate TPS to adjust. Rotating TPS clockwise increases output voltage.
15. Turn ignition switch OFF, then adjust accelerator cable.
16. Disconnect ISC motor connector, then the special tool harness or jumper wires as applicable.
17. START engine, then check idle speed.
18. Turn ignition switch OFF, then disconnect battery terminal for approximately 5-6 seconds to erase malfunction from diagnosis memory.