Mechanics

CODE 54

1993 GMC C1500

Engine Performance problem
1993 GMC C1500 V8 Two Wheel Drive Automatic 191000 miles

When I start engine I have to hold the throttle open for it to run. It runs choppy and pops back through throttle body. It has code 54 stored (low fuel pump circuit voltage) what could cause this? Thanks
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1wwall
August 28, 2009.




Code 54 will set if ECM does not see 12 volts on fuel pump signal voltage monitor during the first 2 seconds after ignition is turned on.
Is this a 5.7? 5.0? The diagram below is 5.7 circuit.


http://www.2carpros.com/forum/automotive_pictures/62217_Code54_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_54a_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_54b_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_54c_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_54d_1.jpg


This chart is for both!

Merlin2021
Aug 28, 2009.
Thanks for the info hopefully this will help me with the problems with this truck. Again thanks
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Tiny
Emersontasha
Apr 24, 2012.

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