You should be able to hear it run for a couple seconds a key on. 18 months is a bit long, but it should still run on that fuel, unless of course it was sub-standard fuel 18 months ago. There is a fuel pressure test port on the fuel injector rail. Aside from having a test gauge, you may be able to see if fuel is present(under pressure) by depressing the core at the test port, it is like a tire valve core. If there is pressurized fuel behind it after key on, or crank, that is one thing, but is the pressure adequate, is another concept. In the trunk, under the floor liner, there is a bolt on panel in the forward RH(passenger) corner. Under that panel is the fuel pump module(at the tank). You can check power and ground at that connector, use a volt meter or test light, across the gray and black terminals. The light should light, or you will see voltage, only for a couple seconds at key on, or during cranking(which may require the use of a second person). If you can confirm power and ground at the pump, you have verified the relay, and the PCM control of the relay. At that point, replace the pump AND filter. To answer your question from the original post, the powertrain control module is in the air cleaner housing.
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Wednesday, November 23rd, 2011 AT 5:39 AM