Nissan Repair Questions? Ask a Mechanic for Answers ASAP
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Did you only replace the IAC? not the ECM?
Well, this is going to require the Ecm to be replaced and the IAC again to resolve your issue.
Let me explain..
What happens is this. The IAC has coolant going around the chamber to cool it. So there is a gasket for the IAC. ( Idle Air Control ). When this gasket fails, coolant seeps onto the IAC motors and shorts the winding's that are controlled by the ECM. Once shorted, both need to be replaced. So if you replace the IAC, and not the Ecm since that circuit is damaged in the ECM, It it will damage the new IAC. So what needs to be done to correct this, is to replace the IAC and the ECM both at the same time. Other wise you will never get a head of the issue. Then you will need to reprogram all your keys for your car and have a Idle relearn performed. Keys can be programmed by either a Mobile Tech, Mobile Locksmith or the Dealer.
Everything needs to be replaced at the same time first. Both the IAC and ECM. Once both are replaced at the same time, re-connect the battery cable and contact a mobile locksmith to come program the keys. Once programmed the car will start. Then I would drive it to the dealer to have a idle relearn done. That will verify the repair and also is necessary to perform after those 2 are replaced
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It is not likely that is ok.
The circuit is damaged in the ECM. That will send incorrect voltage or short out the new IAC. So once the Ecm is damaged, you don't want to even risk damaging the new one. Since I have seen IAC's fail with a simple start of the engine, I would not trust that it is OK.
When you have to replace the ECM and IAC for this issue. I know you don't want to buy another IAC, but after you spend how ever much the ECM is, and the Locksmith to program the keys, you don't want to take a chance that the IAC is bad since you started the car with it. Cause if it was affected by the bad Ecm, that will just put you all the way back to square one. I have seen this to many times. You don't want to take that chance! Trust Me!
You want to be sure the Ohms are with in these ranges a the proper temperature.