Service Engin Soon ????
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Service Engin Soon ????
My Expedition is a 2000 with 63k miles, runs great. I had a loose gas cap which caused the SERVICE ENGIN SOON to come on. I put the gas cap on properly and reset the indicator by disconnecting the positive battery cable. I reconnect it the SERVICE ENGIN SOON was off. It remained off for several days then came on. I went the whole routine again. This happen three times in about three weeks. The light came back on to day. I just came in from checking the gas cap, it seem find. During the period my gas mileage have gone to hell. Does anybody have a suggestion?
Hotshot
Joined: Aug 2002
Posts: 12,679
Likes: 15
From: BC, Canada
Next time the Check Engine Light comes on you should take your truck and get it scanned for codes. Apparently Autozone will do that for free if you have one close by.
Rather than having them scan it and then sell you parts, I would write the code number down, not just the description of it, and post it here. Someone will be able to help diagnose it.
Rather than having them scan it and then sell you parts, I would write the code number down, not just the description of it, and post it here. Someone will be able to help diagnose it.
Posting Guru
Joined: Jul 2003
Posts: 1,978
Likes: 1
From: Alvin, Texas.
Originally Posted by buddythomashou
My Expedition is a 2000 with 63k miles, runs great. I had a loose gas cap which caused the SERVICE ENGIN SOON to come on. I put the gas cap on properly and reset the indicator by disconnecting the positive battery cable. I reconnect it the SERVICE ENGIN SOON was off. It remained off for several days then came on. I went the whole routine again. This happen three times in about three weeks. The light came back on to day. I just came in from checking the gas cap, it seem find. During the period my gas mileage have gone to hell. Does anybody have a suggestion?
I did see a post in a Ranger forum about a guy who tried to get his vehicle inspected. He had a CE light, pulled the cable, reset the code, but the computer had not had enough cycles to allow the inspection test to pass. Ooops. Look for the EECV(?) fuse or relay in the underhood relay box and you'll know what I'm talking about, to some extent.
If you want to reset the computer PROPERLY, isolate it by pulling the ECU fuse in that same underhood box, then wait a minute and pop the fuse back in place.
Don't make it harder than you have to.
P.S. If the mpg's have gone to waste, then you might have an issue that is beyond being cured by a computer reset alone. Sucks to OBD2, eh?
Last edited by AlfredB1979; Jan 7, 2006 at 02:05 AM.
Senior User
Joined: Mar 2003
Posts: 150
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From: Round Rock, TX.
Originally Posted by AlfredB1979
The only problem (can be big for some) is that you reset the EEC system, so when you want to scan the code, you just might have to wait a certain number (maybe a few dozen) of cycles (drives in the truck, basically) to get a good scan of the code you've got.
I did see a post in a Ranger forum about a guy who tried to get his vehicle inspected. He had a CE light, pulled the cable, reset the code, but the computer had not had enough cycles to allow the inspection test to pass. Ooops. Look for the EECV(?) fuse or relay in the underhood relay box and you'll know what I'm talking about, to some extent.
If you want to reset the computer PROPERLY, isolate it by pulling the ECU fuse in that same underhood box, then wait a minute and pop the fuse back in place.
Don't make it harder than you have to.
P.S. If the mpg's have gone to waste, then you might have an issue that is beyond being cured by a computer reset alone. Sucks to OBD2, eh?
I did see a post in a Ranger forum about a guy who tried to get his vehicle inspected. He had a CE light, pulled the cable, reset the code, but the computer had not had enough cycles to allow the inspection test to pass. Ooops. Look for the EECV(?) fuse or relay in the underhood relay box and you'll know what I'm talking about, to some extent.
If you want to reset the computer PROPERLY, isolate it by pulling the ECU fuse in that same underhood box, then wait a minute and pop the fuse back in place.
Don't make it harder than you have to.
P.S. If the mpg's have gone to waste, then you might have an issue that is beyond being cured by a computer reset alone. Sucks to OBD2, eh?
03/EB/5.4/2WD
Are you saying the proper way to reset the CPU is to remove the "ECU" fuse in the underhood fuse box wait a few and replace rather than disconnecting the negative cable?
Hotshot
Joined: Jan 2004
Posts: 19,762
Likes: 1,079
From: St Louis
It's not the gas and it's (obviously) not the gas cap.
Without the codes, you're just pissing time and money away.
Get it scanned.
Steve
Without the codes, you're just pissing time and money away.
Get it scanned.
Steve
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