Wiring short - P0443 Code (system purge solenoid) - Jeep Wrangler Forum

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Old 08-31-2012, 08:44 PM   #1
Join Date: Feb 2011
Posts: 12
Wiring short - P0443 Code (system purge solenoid)

Hi All,
I have a 97 wrangler sport 4.0. The check engine light has been on for 2 years now. Im in a part of Pennsylvania where they require emissions testing and if the check engine light is on, you have to spend up to $150 to try and fix it (receipts have to be submitted if not done by the inspection garage). What a crock.. anyway, last year i had to spend the $150 and in the process, replaced the system purge solenoid valve, the charcoal evaporator canister, and a few other things. One at a time of course but nothing worked. I spent my $150 and got my conditional exemption emissions sticker. now its inspection time again and i want to get the check engine light off.

The mechanic said there were some chewed wires and it was probably a short in the circuit that i needed to check that. Does anyone have any links or know where i can find schematics to help me trouble shoot this circuit.

I hate to rip off all of the wire coverings looking for a break. I need some advice as to where to start and which wires need to be checked.

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Old 08-31-2012, 09:00 PM   #2
Join Date: Oct 2008
Location: Jacksonville,Florida
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According to the 97 TJ Factory Service Manual @ Fuses are involved in the Duty Cycle/Purge Solenoid Fuse #3(30 Amp) in the PDC (Under Hood) & Fuse 11(10 Amp) in the Regular Fuse Panel,Check These 1st,Looks like the wiring colors are Red with Light Green tracer & black,The black runs from the Purge Solenoid to the PCM & the Red/Light Green comes from the Auto Shut Down Relay (Powered Through Fuse #11) Start with the fuses & visualy inspect the wiring for damage & go from there.

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Old 08-31-2012, 11:10 PM   #3
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Old 09-01-2012, 08:37 AM   #4
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GREAT resource. Thank you.
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Old 09-01-2012, 12:16 PM   #5
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Thanks gmiller, i didnt see your post this morning. that info gives me a starting point. im going to start the process sometime this afternoon/evening.
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evaporator purge circuit , p0443 , system purge solenoid , wiring diagrams , wiring short

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