EEC-IV won't talk to Equus 3145 - Ranger-Forums - The Ultimate Ford Ranger Resource


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Old 10-08-2014
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EEC-IV won't talk to Equus 3145

Hey guys I just bought a 93 Ranger XLT with a 2.3L. It is sooting up the plugs and and I need to check for codes. So I bought the Equus 3145 code reader and followed ther steps to pull the codes from the EEC, but I can't get the EEC to talk with the Equus reader.

I checked for fuses blown after reading another thread about a related repair, but found none blown. I guess my first question would be: Does the EEC Test Port Connecter have any (+) voltage to any of the terminals? My tech hunch says it should because the test can be done manually with a jumper wire, so I'd think one of the terminals is hot - Need to confirm though because none of mine are hot.

What should I start out looking for to solve this initial problem - eventually I hope to get on to checking for some codes...

Thanks
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Old 10-09-2014
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OBD1 is different, I don't think there is 12v at the test port.

This is a page that shows how to read OBD1 codes with a meter or test light: Ford Ranger - Testing EEC-IV Equipped Engines

If there was 12v at the test port then meter or test light would use that instead of battery.

I am just guessing based on that web page

Does the check engine light(CEL) come on when key is turned on and then go off, if not there could be a power issue with the computer
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Old 10-09-2014
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Ron thanks for the response. The CEL comes on when the key is turned on and stays on all the time, even while driving....
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Old 10-09-2014
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I would try to read codes manually, test light or meter.
I know there were some years that Ford didn't follow OBD protocol to the letter, so reader won't work with them, but I did think the Equus would
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Old 10-12-2014
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Quote:
Originally Posted by RonD View Post
I would try to read codes manually, test light or meter.
I know there were some years that Ford didn't follow OBD protocol to the letter, so reader won't work with them, but I did think the Equus would
I'm going to look at it again today and try the test light method. Thanks for the link that showed the test light method, it clarified the power direction question. It looks like the test ports may be all ground base on the diagram that show the test light being connect from the + batt terminal to the test port connector....

Just don't want to blow the EEC powering it incorrectly!!!
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