Grand AM L4-138 2.3L DOHC VIN D MFI (1994)
3. If codes 19, 42, 43 or 51 occur, or if the "SERVICE ENGINE SOON" light is on consistently with no codes, the MEM-CAL/PROM is not seated
properly or is defective. If not fully seated, press firmly on the ends of the MEM-CAL/PROM.
4. Before starting engine reset Idle Air Control valve pintle position:
A. Turn ignition switch to the "ON" position.
B. Ground diagnostic "test" terminal for five seconds.
C. Remove ground.
D. Turn ignition "OFF" for ten seconds.
E. Start engine and check for proper idle operation.
NOTE
Disconnecting PCM from it's power source will clear all PCM memories. Since some operations (particularly IAC valve idle control) are
"learned", it may be necessary to partially depress the accelerator pedal when restarting the engine after PCM memory is cleared. It may also
be necessary to release the accelerator pedal very slowly when returning to idle, to prevent a stall. This will allow the PCM to "relearn" IAC
valve position.
5. Learned operations may be restored by normal driving.
