Owners of 2004-07 Nissan Titan pickups and Armada SUVs built before Feb. 22, 2007, may complain that their truck has little power under wide-open-throttle operation.
According to Nissan, the lack of power may be accompanied by an illuminated check engine and various stored trouble codes, and is most likely due to insufficient fuel delivery from the fuel pump.
To make a definitive diagnosis, start by hooking up a fuel pressure gauge to the fuel line. Now set the parking brake, hold your foot on the brake pedal and perform a stall test while looking at the gauge. Keep the test to under five seconds to avoid overheating the transmission.
If the fuel pressure maintains at 45 psi or above during the stall test, the fuel pump is good. Continue troubleshooting until the problem is resolved.
If the pressure drops below 45 psi during the test, the fuel pump isn't capable of delivering enough fuel. Replace the pump and the O-ring seal with the following updated parts:
- Part No. 17040-7S20A – 2004-06 Titan, Armada (gas)
- Part No. 17040-ZH00A – 2005-07 Titan (flex fuel)
- Part No. 17040-ZE00B – 2007 Titan, Armada (gas)
- Part No. 17040-ZH00A – 2007 Armada (flex fuel)
"Factory Fixes" is written by Jim DePalma, a 30-year veteran of the auto repair business who has served stints as a service manager, parts manager and ASE-certified technician. His column provides vehicle manufacturers' authentic factory technical service bulletins (TSBs) that have been condensed for easier reading. Mr. DePalma advises that techs always check with a dealer or repair information system for the latest revisions before starting to work on a vehicle. He can be reached via e-mail at [email protected].
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