QX56 AWD V8-5.6L (VK56DE) (2005)
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When accelerating with Wide Open Throttle (WOT) the engine power is reduced
ACTIONS
1.
Check fuel pressure during a transmission Stall Test (see Service Procedure).
2.
If fuel pressure test is NG replace the fuel pump.
NOTE:
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.
IMPORTANT:
The purpose of "ACTIONS" (above) is to give you a quick idea of the work you will be performing. You MUST closely follow the entire Service
Procedure as it contains information that is essential to successfully completing this repair.
PARTS INFORMATION
CLAIMS INFORMATION
Submit a Primary Part (PP) type line claim using the claims coding shown.
SERVICE PROCEDURE
1.
Connect a fuel pressure gauge to the engine (special tool kit J-44321 or equivalent).
^
Follow all instructions under "Fuel Pressure Check" in Section EC of the Service Manual for connecting the fuel pressure gauge.
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 InspecUons Before Trouble Diagnoses" in Section AT of the Service Manual.
CAUTION:
Do not hold down the accelerator pedal for more than 5 seconds while performing the Stall Test.
^
Fuel pressure is NG if it drops below 45 psi during the Stall Test.
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If the fuel pressure is OK, this bulletin does not apply. Return to ASIST for further diagnosis and repair information.
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If the fuel pressure is NG, go to step 3.
3.
Replace the fuel pump.
^
Follow all instructions under Fuel Pump Assembly, Removal and Installation" in section FL of the appropriate Service Manual.
^
Use the fuel pump listed in the Parts Information.
^
Make sure to use a new fuel pump 0-ring seal.
4.
Test drive the vehicle; make sure the incident is fixed.
NOTE:
^
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.
