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Sensors do not always throw codes if they are close to normal parameters, needs to be checked with a scan tool and thermometer.
There is usually a high and a low speed fan relay, as well as a separate A/C fan relay (also high) Your High speed fan relay could be bad, or the fuse for it.
Engine idle surging usually means the coolant is boiling and there is no longer liquid in the throttlebody causing it to go to a high idle because it thinks the engine is cold. Warm coolant closes a valve lowering the idle on most Japanese makes of that year.
Also, sometimes Thermostats stick half open and do not allow enough flow. AND sometimes in neglected cooling systems Water pump Vains are eroded by electralosis causing low coolant flow as well. And a Clogged radiator can also cause this, as by the time the fans run on high it's to late.
It may well be a cold start injector/air meter/sensor at fault.
Don't waste time and money changing things to cure the problem. The cheapest way is to take the car for a diagnostic check. They should be able to identify the fault immediately. You can then save money by rectifying the fault yourself ..
After searching around, I found several posts that suggested reseating all the relays and fuses under the hood. After checking, I noticed nearly all of them were not seated well. I pushed them all down and I haven't had the problem since.
I have seen this problem countless times, and no computer can give you the answer, The problem is your ECT. The Engine Coolant Temp sensor. It tells the computer what temp the engine is at and it uses this input to regulate the fuel. When the engine is cold, the fuel is increased to act as the choke for easier starting. As the engine warms up, the fuel is cut back. When the sensor locks cold, the computer runs the engine in choke mode all the time, sending the fuel ecom\nomy down the toilet.