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Old 09-27-2005, 07:50 PM
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Trouble Code 54

Hello,
I also have this posted in the engine forum. I am trying to find out what can cause my car to display the gm trouble code 54. when i looked it up it came back as "Fuel pump voltage was not present at fuel pump sense line for 2 seconds after the ECM has sent the fuel pump on command." What does this mean? The car is a 1993 buick roadmaster with the 350 throttle body engine.

Thanks in advance,
John

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Old 10-06-2005, 03:45 PM
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Error...

Taking the error code literally, it sounds like the wire the ECM uses to SENSE that it turned on the fuel pump might be broken or disconnected. I'm ASSUMING that your car runs OK.
If the car runs, then so is the fuel pump. The error code seems to say that the ECM doesn't SENSE the fuel pump power ON.

Tom
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Old 10-06-2005, 05:40 PM
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Does it run?

Doc here,

If it does run...measure the voltage across the battery at idle , a few minutes after start up .... It should read 14.4 volts...

If it reads around 11 or so..you may have a bad diode in the alternator, causing a lowered DC voltage, and some AC ripple into the system, (about 4 volts)

The computer may see this on the Voltage sensing buffer as a loss of DC power, or DC input feedback to the fuel pump buffer..and tossing a code..

Also an AC ripple is a bad thing on computer longevity..It may not even be at a point where it will manifest itself yet (overnight dead battery's) but enough to raise havoc with the computer..

I will look at the schematic tonight and see if I can find something else to cause this problem and let you know...

Doc
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