Join Date: Jun 2008
Location: Brampton, Ontario, Canada
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Is it a P1102 by itself, or are there other codes as well? Is it an early-build 2004 or late-build 2004? Assuming it's a late-build 2004, the pinpoint test to diagnose a P1102 by itself is very straightforward. But to do this, you will need a scan tool that can read live data so that you can access MAF volts. At engine idle, you should see between 1.2 to 1.8 volts. With engine speed increased to 2500 RPM, you should see 2.4 to 3.0 volts. With a hard P1102, you will likely see lower values. Do you have an aftermarket air filter? If so, and the values observed are less than listed above, try repeating the test with the air filter removed. If the values improve to the range listed above, re-install the factory air intake setup and retest. If the circuits check out good, but you still see lower than expected readings, replace the MAF sensor. For what it's worth I have yet to replace a MAF sensor or PCM on one of these trucks.
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Ford Diesel/Senior/Master Tech who placed 2nd overall in Ontario on the Fix-It-Right-First-Visit score for 2010
....who works at a dealership that now employs SOME half decent looking female employees since they overhauled most of the administrative staff
....but STILL loves hot women with big boobies
....and STILL hates working on E-Series with 6.0L