SW L4-1.9L DOHC VIN 7 (1993)
Idle Speed/Throttle Actuator - Electronic: Service and Repair
Idle Air Control (IAC) Reset Procedure
IAC RESET PROCEDURE
The PCM resets the IAC valve pintle position only after a power is shut "OFF". During the reset, the PCM commands the IAC valve pintle to
move In to the seated position (to establish the zero count position), and then back out to the desired position.
The IAC valve also can be reset without driving the vehicle by using the following service procedure:
1. Disconnecting the battery.
2. Use the service tool SA9195E (or equivalent) and run the pintle in.
3. Use the Portable Diagnostic Tester (PDT) (or equivalent) and command the pintle in.
DIAGNOSTIC NOTES
If the IAC valve is disconnected and connected while the engine is running, the resulting IAC valve counts may not correspond with the actual
IAC valve pintle position. When servicing the IAC valve, it should only be disconnected or connected after the ignition has been turned "OFF" for
at least 10 seconds. This allows time for the PCM to move the IAC valve to the 100 count position where it is parked while the ignition is "OFF".
If this procedure is not followed, the PCM will lose track of IAC valve position resulting in starting or idle control problems until the IAC valve
pintle position is relearned.
