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Your vehicle should have a check engine light. I had the same question about mine (does it have one?) until I removed the gauge cluster and found that the light and the socket had been removed by a previous owner...presumably to sell the vehicle. This may be the case with yours (the light having been removed).
Regardless, I find it curious that yours has a 3-wire sensor. Mine (a '95 4-cyl) only has a one wire, which was the norm until the past decade. Maybe the V6 engines do have 3-wire sensors and the PCM is calibrated differently. There are many different acronyms for the engine/powertrain computer, and the term you use depends on what you're used to using.
PCM = Powertrain Control Module
ECM = Engine Control Module
For this application, you (I) would really be more correct calling the computer an ECM, since it really only controls the engine. In other modern vehicles, the engine controls the engine and transmission, and is referred to as a PCM, since it controls the whole powertrain.
On my truck, the ECM is underneath of the passenger seat. I removed the seat to access it, since the screw you use to change modes points toward the transmission tunnel...completely inaccessible with the seat installed.
View and print the sticky post under "From your friendly moderator". The message from Tolleyy explains the process on the 91-95 Hardbody and Pathfinder. It's fool proof as long as you go step-by-step. You can't mess anything up.
That link is correct...but it looks like the server my homepage is on is down. Nuts.
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