engine codes 553, KOER 312, 225
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engine codes 553, KOER 312, 225
I've got a 4.9 L with a manual. I'm trying to decifer these codes.
553 Air Management 2 circuit failed, SBS circuit failed....what is this?
312 thermactor air was misdirected. what is the thermactor
225 something with the knock sensor?
thanks a lot.
Brian
553 Air Management 2 circuit failed, SBS circuit failed....what is this?
312 thermactor air was misdirected. what is the thermactor
225 something with the knock sensor?
thanks a lot.
Brian
Fleet Mechanic
Joined: Mar 2005
Posts: 1,603
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From: St Louis
What year is the truck?
It is related to your Air injection system I believe it is the diverter that directs air to the head or to the cat.
Thermactor is your Air injection system.
Either check to make sure your knock sensor is plugged in or even working properly. Only problem is someone with a 4.9 or knows more about them than I will have to tell you where the KS is located. Use Fordfuelinjection.com to learn how to test the KS.
It is related to your Air injection system I believe it is the diverter that directs air to the head or to the cat.
Thermactor is your Air injection system.
Either check to make sure your knock sensor is plugged in or even working properly. Only problem is someone with a 4.9 or knows more about them than I will have to tell you where the KS is located. Use Fordfuelinjection.com to learn how to test the KS.
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Sorry, it's a 1991.
ok, i found the thermactor on fordfuelinjection.com, i must not have looked at the right place before. I'm thinking it is off the smog pump, the second diverter, from what i understand? I will try to find one at the junk yard and swap it out.
ok, i found the thermactor on fordfuelinjection.com, i must not have looked at the right place before. I'm thinking it is off the smog pump, the second diverter, from what i understand? I will try to find one at the junk yard and swap it out.
Fleet Mechanic
Joined: Mar 2005
Posts: 1,603
Likes: 1
From: St Louis
They can be purchased brand new, but there are different versions of the diverters. One diverter is 2 in one, another has the muffler built into it, yet another is looks the same for the TAB and TAD. Since it is a 91, the only sensor is if the computer gets a rtn signal from the switch ontop of the motor. I would check to see if they are plugged into the wiring harness, if not it may be just a bad switch.
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