Need 1985 ECM Code 54 help !
Thread Starter
Intermediate
Joined: Mar 2002
Posts: 32
Likes: 0
From: Greer SC
Need 1985 ECM Code 54 help !
I have a 1985 with the CHeck Engine light on.
I have replaced the fuel pump relay switch and the fuel pump. I've checked all the wires and there seems to be good connection.
I'm getting Code 54 ( Fuel Pump Voltage Low Circuit) on the Control Panel.
The light will go off as long as I turn the switch off and then restart the car. The car seems to start and run fine. ...now Just this "CHeck Engine" light is aggravating.
My mechanic says it could be the ECM itself but I wonder about that. He says he can't guarantee that would fix it.
What advice can you guys give??
Should I take it to another mechanic??? Or Leave it alone until something else happens?? The car has 180,000 miles on it but still runs strong.
Thanks in advance.
S
[Modified by Slingshot, 12:36 PM 3/18/2004]
[Modified by Slingshot, 12:37 PM 3/18/2004]
I have replaced the fuel pump relay switch and the fuel pump. I've checked all the wires and there seems to be good connection.
I'm getting Code 54 ( Fuel Pump Voltage Low Circuit) on the Control Panel.
The light will go off as long as I turn the switch off and then restart the car. The car seems to start and run fine. ...now Just this "CHeck Engine" light is aggravating.
My mechanic says it could be the ECM itself but I wonder about that. He says he can't guarantee that would fix it.
What advice can you guys give??
Should I take it to another mechanic??? Or Leave it alone until something else happens?? The car has 180,000 miles on it but still runs strong.
Thanks in advance.
S
[Modified by Slingshot, 12:36 PM 3/18/2004]
[Modified by Slingshot, 12:37 PM 3/18/2004]
Race Director
Joined: Aug 2000
Posts: 11,506
Likes: 4
From: Vancouver,Wa.
Re: Need 1985 ECM Code 54 help ! (Slingshot)
I would get a new ECM. They are cheap and It's allways nice to have a spare.
http://www.c4vettes.com/ecm.htm
http://www.c4vettes.com/ecm.htm
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Need 1985 ECM Code 54 help ! (Slingshot)
Does the code come up at startup or after the engine is running?
Does it come up every time or is it intermittent?
[Modified by 65Z01, 2:52 PM 3/18/2004]
Does it come up every time or is it intermittent?
[Modified by 65Z01, 2:52 PM 3/18/2004]
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
Re: Need 1985 ECM Code 54 help ! (Slingshot)
The reason I asked is that the ECM checks voltage at various times;
-during the 2sec fuel rail prime at startup, when the relay supplies power to the fuel pump
-during normal running when only the oil pressure switch supplies power to the fuel pump
If the code is thrown during normal engine operation it's possible that the oil pressure switch is flakey or boarder line.
An intermittent is tough to diagnose, so you might consider replacing that switch before doing the ECM.
-during the 2sec fuel rail prime at startup, when the relay supplies power to the fuel pump
-during normal running when only the oil pressure switch supplies power to the fuel pump
If the code is thrown during normal engine operation it's possible that the oil pressure switch is flakey or boarder line.
An intermittent is tough to diagnose, so you might consider replacing that switch before doing the ECM.
