Leak detection pump
05-18-2011, 11:39 AM
#1
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Join Date: May 2011
Location: Atlanta, GA
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Year: 1999
Model: Grand Cherokee
Engine: 4.0
Leak detection pump
My 99 grand cherokee 4.0 threw a code for a faulty leak detection pump. I tested the leads going into the pump with a test light and got a negative result. Do these leads have a 12v constant or is power supplied to the pump only when it needs it??
05-18-2011, 09:54 PM
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Year: 2000
Model: Cherokee
Engine: 4.0
I'm almost positive that it is NOT constant power. It cycles on and off. They are notoriously bad also and I have changed quite a few if that means anything
05-20-2011, 10:11 PM
#7
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Year: 1999
Model: Grand Cherokee
Engine: 4.0
Thanks for all the help everyone! I found the culprit and it was a disconnected vaccum line from the pump to the manifold. Again, thanks for all the help!
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