Couldn't read codes
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Mountain Pass
Joined: May 2002
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Couldn't read codes
1988 F250
I went to the local auto parts store and they let me use their code reader which had two connectors - the larger plug and the smaller STI plug. I plugged both in and followed the directions and got no results - an error message saying that it couldn't read the data.
Anyway - should I have grounded the STI plug as if I was going to read the codes from the check engine light?
Thanks, Dan
I went to the local auto parts store and they let me use their code reader which had two connectors - the larger plug and the smaller STI plug. I plugged both in and followed the directions and got no results - an error message saying that it couldn't read the data.
Anyway - should I have grounded the STI plug as if I was going to read the codes from the check engine light?
Thanks, Dan
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Doesn't matter what computer you have or what vehicle it's in all EEC-4 computers work the same with regards to pulling codes, so as long at the wires for the test connector are actually attached to the computer you can get codes.
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From: Montague, NJ
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Mountain Pass
Joined: May 2002
Posts: 100
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Everything is stock as far as I know.
Frankyford
It wasn't autozone or advance auto. But the test connector fit exactly and I didn't pay attention to whether is was OBD 1 or OBD2.
Paul O,
Let me make sure I understand you. If I ground the STI wire and turn the key to run, the check engine light will blink. If the light doesn't blink the computer (the whole EEC) is toast. Is it possible for the truck to run if the computer is toast?
Thanks, Dan
Frankyford
It wasn't autozone or advance auto. But the test connector fit exactly and I didn't pay attention to whether is was OBD 1 or OBD2.
Paul O,
Let me make sure I understand you. If I ground the STI wire and turn the key to run, the check engine light will blink. If the light doesn't blink the computer (the whole EEC) is toast. Is it possible for the truck to run if the computer is toast?
Thanks, Dan
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I just asked that same question the other day on this forum and everyone told me absolutely no, it will not run without the computer. I've got a 95 F-150 302 auto and I've got the ODB-1 in mine. When I went to autozone to have my codes read they told me they couldn't read them because they had the reader for the ODB-2. Yours should have the ODB-1 in it.
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FTE Legend
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From: Ottawa, Ontario
Well that's not really the same question. You're asking if the motor would run with the computer removed from the vehicle, and the answer is definitely no. This issue is possibly more of a computer fault.. could be anything from a burnt trace to a blown component inside the box, and the computer may still run the motor more or less but this isn't something that can be fixed so the whole EEC module has to be replaced.
FTE Legend
Joined: Jun 2006
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From: Ottawa, Ontario
Starting the motor as you would any day.. when the key to turned to run all the dash lights come on and that should include the check engine light for a second, if this doesn't come on check that the bulb isn't blown first. I you can determine that the bulb is good but the light doesn't come on at first start then it's almost certain the EEC computer has a fault. If the light does come on for a second but you can't get it to display codes by groundig the STI wire, then trace the STI wire back to the EEC connector to ensure it's good. You'll have to disconnect the harness from the computer to do this so look for corrosion on the pins or a pin that is pushed back as well as broken/cut wires. fordfuelinjection has diagrams of the EEC connector.
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phoneman91
1987 - 1996 F150 & Larger F-Series Trucks
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Feb 20, 2005 10:22 PM
