Won't start

Winston · 07-03-2006, 06:50 AM

I am working on my sons 94 Gt . It will not start and I have a trouble code number 543. It says Fuel pump circuit open; PCM TO MOTOR. I have no power to anything. Head light won't come on, starter won't turn, Battery is fully charged. Dome light and radio does work. I the PCM shot.

Could anyone help me figure this out?

Jeff Chambers · 07-04-2006, 08:12 AM

I'd start checking the major busses and fusible links. Usually a sure sign of the PCM being fried is that the fuel pump and fan will both run constantly when the key is in the ON position.

07-03-2006, 06:50 AM	#1
Winston Registered Member Join Date: Nov 2005 Posts: 6	Won't start I am working on my sons 94 Gt . It will not start and I have a trouble code number 543. It says Fuel pump circuit open; PCM TO MOTOR. I have no power to anything. Head light won't come on, starter won't turn, Battery is fully charged. Dome light and radio does work. I the PCM shot. Could anyone help me figure this out?

07-04-2006, 08:12 AM	#2
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	Re: Won't start I'd start checking the major busses and fusible links. Usually a sure sign of the PCM being fried is that the fuel pump and fan will both run constantly when the key is in the ON position. __________________ Jeff Chambers 1990 Mustang GT 10.032 Seconds / 137.5 MPH 14-time Street Warrior World Record Setter CRT Performance 2001 Tropic Green Mustang GT - 12.181 / 113.2 MPH 2002 Ford F-250 Crew Cab 7.3l Power Stroke - 17.41@77.2 "There's nothing boring about a small block automatic shifting gears at 9400 rpm!"

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