P0251 Injection pump fuel metering control "A" malfunction

Tiny
JASONL
  • MEMBER
  • GMC SAVANA
I pulled this code - P0251 Injection pump fuel metering control "A" Malfunction
(cam/rotor/injector). I have no clue where to start or what to fix. Can somebody help me? It is a 1998 3500 Savana van with the 6.5 turbo diesel. I am lost and need some guidance please.
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Tuesday, July 24th, 2007 AT 7:11 PM

6 Replies

Tiny
CLY
  • MEMBER
Did the light just come on? Did you change the fuel filter or run out of fuel by any chance? Any drivability problems?

Cly
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Tuesday, July 24th, 2007 AT 7:21 PM
Tiny
JASONL
  • MEMBER
I have changed the fuel filter. It just started doing this about a week ago. I have pulled the fuel tank off and cleaned everything. I have tried to research where to look or what to look for but no luck so far. I am just wondering where the electrical circuit is located to even find the malfunction? If you might know or even have a idea where to start I would be very happy. Thanks for the help.

Jason
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Tuesday, July 24th, 2007 AT 9:13 PM
Tiny
CLY
  • MEMBER
The electrical side of it has circuits that run from the power-train control module to the optical fuel temperature sensor. If there is air the the fuel system the light will come on. Make sure fuel system is free of air. I would suspect that the optical sensor is faulty. I do not believe that it is service separately from the fuel injection pump.

Here is a schematic of the circuits:


http://www.2carpros.com/forum/automotive_pictures/86485_195167_1.jpg



Here is a picture of the pump assembly. Optical fuel temp sensor is #1.


http://www.2carpros.com/forum/automotive_pictures/86485_192955_2.jpg



Hope this helps.

Cly
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Wednesday, July 25th, 2007 AT 5:09 AM
Tiny
JASONL
  • MEMBER
Yes that does help. I will try to see if there is air in the system and try again. And I am guessing that part is on the top right side of the motor. Can that sensor be replaced or if that is the problem am I just out of luck?

Thanks for helping me so far.

Jason
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Wednesday, July 25th, 2007 AT 5:42 AM
Tiny
CLY
  • MEMBER
I think that it comes with the unit, but I would still make some calls and see if maybe they are available separately.

Cly
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Wednesday, July 25th, 2007 AT 5:49 AM
Tiny
JASONL
  • MEMBER
Thanks for all your help. I hope I can be as helpful sometime.

Jason
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Wednesday, July 25th, 2007 AT 7:59 PM

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