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Old 05-04-2014
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I am: d
Join Date: May 2014
Location: Tn
Vehicle: 1994 Ford Ranger
Drive Type: 4x2
Engine: 4.0
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My fuel pump wasn't turning on so after going through every check point i could think of i pulled the PCM. I've attached a pic of the PCM, it is clearly burnt on the inside.
My question is: what causes a PCM to do this? Is it in the wiring? A bad relay somewhere? Also, which numbers should i match up when looking a replacement at the local junk yard? ThanksBad PCM-bad-pcm.jpg
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Old 05-05-2014
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I am: Ron Dean
Join Date: Jan 2014
Location: Vancouver, BC
Vehicle: 1994 Ford Ranger
Drive Type: 4x4
Engine: 4.0
Posts: 4,767
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Usually moisture gets inside the case or connector and causes a short.

Look at the diagram here: ford eec iv
Test the connector for the described voltages or grounds to see if there are any problems

Last edited by RonD; 05-05-2014 at 10:42 AM.
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