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- MAF DIAGNOSTIC SERVICE TIP - VEHICLES EQUIPPED WITH EGR SYSTEM MODULE (ESM)
| Publication Date: January 28, 2005 |
| 2003-2005 Crown Victoria, Thunderbird |
2005 Five Hundred, Ford GT, Freestyle, Mustang
2004-2005 Explorer, F-150, Freestar
| 2003-2005 LS, Town Car, Aviator |
| 2003-2005 Grand Marquis |
2004-2005 Monterey, Mountaineer
When diagnosing for a possible MAF sensor related condition, on a vehicle equipped with an EGR system module (ESM), an incorrect engine-running BARO value is no longer a reliable indicator of a skewed MAF sensor. Vehicles with ESM use both the MAP and MAF for engine-running BARO updates. Replacing the MAF sensor for a seemingly incorrect or inconsistent key-on BARO is not an effective repair for vehicles equipped with an ESM.
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