Nissan Repair Questions? Ask a Mechanic for Answers ASAP
Usually the issue is the wiring to the relay from the exterior fuse box to the ecm relay. The ecm relay is located behind the glove box inside the car, but in most cases and I can't tell you how many times, I have repaired the wiring under the fuse box and battery outside where it is all bunched together under the battery to resolve the problem.
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First, you have to do an idle relearn after you put the new IAC in
1. Turn ignition switch “ON” and wait at least 1 second.2. Turn ignition switch “OFF” and wait at least 10 seconds.3. Start engine and warm it up to normal operating temperature.4. Check that all items listed under the topic “PRECONDITIONING”,EC-1419 (previously mentioned) are ingood order.5. Turn ignition switch “OFF” and wait at least 10 seconds.6. Start the engine and let it idle for at least 15 seconds.7. Disconnect throttle position sensor harness connector (brown),then reconnect it within 5 seconds.8. Wait 15 seconds.9. Make sure that idle speed is within specifications. If not, theresult will be incomplete. In this case, find the cause of theproblem by referring to the NOTE below.10. Rev up the engine two or three times. Make sure that idlespeed and ignition timing are within specifications.
If it won't do the relearn, then try disconnecting the mass air flow sensor or check for vacuum leaks to see if that's the cause of the idle issue. It could be something else causing the idle to do this and the computer will always blame the IAC.
Try it and let me know.
Did you try the manual relearn I sent in my last reply?