TSB's

Low power at WOT

This TSB applies to 2004-2007 Nissan Titan and Armada vehicles built before Feb. 22, 2007.

If the customer complains that engine power is reduced when accelerating at wide open throttle (WOT), check fuel pressure during a transmission stall test, following guidelines in the service manual. If fuel pressure is not as specified, replace the fuel pump. Low fuel pressure may cause DTCs to be detected. If you have DTCs with this incident, first replace the fuel pump and then recheck the DTC diagnosis.

  1. Connect a fuel pressure gauge to the engine (using special tool kit J-44321 or equivalent).
  2. Look at the fuel pressure while performing a transmission stall test. The stall test 10-minute warm-up is not needed for this service procedure. Follow all other instructions for performing the stall test under “Inspections Before Trouble Diagnosis” in Section AT of the service manual. Caution: Do not hold down the accelerator pedal for more than five seconds while performing the stall test. Fuel pressure is no good if it drops below 45 psi during the stall test. If the fuel pressure is OK, this bulletin does not apply. Return to ASIST for further diagnosis and repair information. If fuel pressure is no good, go to Step 3.
  3. Replace the fuel pump. Use only the fuel pump listed in the parts information included here. Be sure to use a new fuel pump O-ring seal.
  4. Test drive the vehicle to confirm the repair.

FUEL PUMP PARTS INFORMATION

2005-2007 Titan Flex Fuel and 2007 Armada Flex Fuel……………17040-ZH00A

2004-2006 Titan and Armada gasoline-only………………………...17040-7S20A

2007 Titan and Armada gasoline-only………………………………17040-ZE00B

Fuel pump O-ring (all)……………………………………………….17342-7S000

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