Mechanics

FUEL INJECTOR CONNECTOR

2002 Jeep Liberty

Electrical problem
2002 Jeep Liberty 6 cyl Four Wheel Drive Automatic 90000 miles

I was looking at converting my Jeep to run on E85 fuel and in order to know what kit to buy I had to test the polarity of my fuel injection system. To do this I removed the connector from my #1 cylinder, then started the engine and used a volt meter to measure which terminal was the 12V and which was the pulse. After completing the test I replaced the connector and started the engine and my check engine light was on and the engine was shaking. Pretty clear my #1 cylinder was dead. When I had a computer diagnosis at the auto parts store the code indicated I had an open circuit on my #1 cylinder. I figure I had bent something when doing my testing so I replaced the connector and checked the wiring for any missing insulation that could cause a short. Everything looked good but even with the new connector it hasn't fixed the problem. I then did a continuity check and I found that both the 12V wire and the pulse wire have continuity to the body ground. It is possible that the computer may be keeping the 12V wire grounded? I can't find any kind of short in the wiring so it seems like the short has to be deeper down. Thanks.
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Weisscc
June 1, 2008.



You may have hurt the PCM when you did the testing, sounds like it has dropped the injector driver for that cyl. You can try having Jeep " flash" the PCM that might bring it back

Tiny
Jack42
Jun 2, 2008.