Self test connector not working?
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4wd High
Joined: Aug 2024
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Self test connector not working?
I have a 1990 F-150 with the 4.9 and recently got a rough idle and a check engine light. I tried to use the self test connector with a paper clip, but no matter what I try it doesn't seem to work. I'm debating buying a code reader. Any suggestions?
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4wd High
Joined: Aug 2024
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https://www.amazon.com/INNOVA-3145-F...s%2C155&sr=8-5
Great reader for cheap. I've had mine for over 2 years and never lets me down.
Great reader for cheap. I've had mine for over 2 years and never lets me down.
Hotshot
Joined: Jun 2015
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4wd High
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yep, it lights up just doesn't do the self test
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If you cannot get the computer to go into display mode with a jumper lead, a code reader is not going to work either. Start with using a known good ground (battery negative is the best choice) then jumper the gray/grey STI connector to it.
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