Idle Speed Control System
- Run engine at fast idle until coolant temperature is 185-205°F (85-90°C). Turn off engine. Disconnect accelerator cable from throttle lever of injection mixer. Loosen the 2 screws installing the throttle position sensor. Turn throttle position sensor fully clockwise. Tighten screws.
- Turn ignition switch to the "ON" position for more than 15 seconds, then turn ignition off. This will set ISC servo to specified position. Disconnect ISC servo harness connector. Start engine. Check engine speed and adjust to specification with screw. See Fig 1
.
ENGINE IDLE SPEEDS
| Application |
ISC RPM |
| Starion |
750 |
- Stop engine. To read output voltage of TPS, insert test probe from rubber cap side of TPS connector and bring it into contact with connector pins. Insert test probes along "GW" lead (TPS output) and "B" lead (ground) of body side harness. See Fig 2
.
- Turn ignition switch to "ON" position without starting engine. Read TPS output voltage. Output voltage should be .45-.51 volts. If not, loosen TPS mounting screws and turn sensor until correct output voltage is obtained.
- Immediately open throttle valve, return it to original position and check for proper output voltage readjusting if necessary. Remove adapter, voltmeter and test probes and reconnect ISC servo harness connector.
- Make sure idle speed is normal. Stop engine and turn ignition switch from "OFF" position to "ON" position and after 15 seconds back to "OFF" position. Connect accelerator cable to throttle lever of injection mixer and adjust accelerator cable.
