Code Scanner
Senior Member
Joined: Jan 2010
Posts: 466
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From: Roanoke, VA
You should have received two sets of codes with the key on and engine off. First is the KOEO codes, followed by the stored (continuous memory) codes. Just so we're clear, these were KOEO and not stored?
Senior Member
Joined: Jul 2008
Posts: 58,557
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From: Long Beach Calimexifornia
Was this an engine running test? I'm doing this from memory (book is at home), but I believe there's a point (flash of the CEL to notify you) that you're supposed to solidly goose the throttle and the system checks for the TPS going above a certain set point, RPM increase, etc. If you missed that, this would be one of the codes you'd see.
Edit - scratch that, 123 is above range, not below. Sounds like your TPS may be adjusted wrong. Again, looking at the book will help immensely on this. I'll be home in a few hours and can grab the info.
Edit - scratch that, 123 is above range, not below. Sounds like your TPS may be adjusted wrong. Again, looking at the book will help immensely on this. I'll be home in a few hours and can grab the info.
That's the one. You're assuming he has an adjustable TPS. Doubt a 92' does.
Another possibility is someone at sometime, adjusted your throttle set screw. Very likely. check butterfly to insure proper closure.
See link: http://www.fordfuelinjection.com/?p=30
Last edited by ymeski56; Apr 5, 2011 at 02:55 PM.
Senior Member
Joined: Jan 2010
Posts: 466
Likes: 1
From: Roanoke, VA
Right, with the engine off there are two sets of codes. KOEO (repeated), separator code, then stored codes (repeated).
Grab a volt meter and check the voltage reading at the TPS. If everything is correct there at idle and moves progressively up to almost 5V at WOT, test the voltage reading on the TPS signal input to the ECU.
Grab a volt meter and check the voltage reading at the TPS. If everything is correct there at idle and moves progressively up to almost 5V at WOT, test the voltage reading on the TPS signal input to the ECU.
Senior Member
Joined: Jul 2008
Posts: 58,557
Likes: 1,165
From: Long Beach Calimexifornia
However, the TSS screw being tampered w/ will cause the TPS to produce an abnormally high reading at idle.