Corsica V6-173 2.8L (1987)
^
Restore battery power.
^
Connect Tech I "Scan" tool.
^
Select "IAC SYSTEM," then select "IDLE LEARN" in the "MISC TEST" mode.
^
Proceed with idle learn as directed.
This procedure allows the Electronic Control Module (ECM) memory to be updated with the correct IAC valve pintle position, for the vehicle,
and provide a stable idle speed.
INSPECT
^
Connect "Scan" tool to Assembly Line Data Link (ALDL) connector.
^
Place transmission selector in "Park" (A/T) or "Neutral" (M/T).
^
Start engine, allow it to reach normal operating temperature (about 90°C) and "Closed Loop."
^
Using "Scan" tool, observe Idle Air Control (IAC) valve counts.
NOTICE:
Battery must have been disconnected during replacement procedure and then reconnected before checking IAC valve counts. This will enable
the ECM to relearn the IAC valve pintle position.
IAC valve counts should be checked with all accessories (A/C, rear defog, etc..), transmission in "PARK" (A/T) or "Neutral" (M/T), and
engine cooling fan "OFF."
Make sure throttle and cruise control cables do not hold throttle open.
With engine stabilized, IAC valve position should be 10 to 20 counts. If not, repeat adjustment procedure.
