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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars


 
 
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Old 02-02-2010, 05:16 PM   #1
az_240
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$10 if you figure out my emission problem. Different ecus giving different codes.

This emissions problem is kicking my ass in every possible way.

I have a 97' 240 w/ 120k that was originally automatic which passed emissions just fine back in the day. It now has a manual transmission and will not pass due to an evap or possible wiring issue.

I was told all I'd need is a 97' manual ECU. Borrowed one from someone and did not pass because of code P0443 (evap emission control system purge control valve circuit) and failed the gas cap test. Got a new aftermarket gas cap and checked the evap canister and lines for charcoal, evap solenoid, evap purge control valve for resistance, purge valve and vac lines. I also checked some other things the FSM says to check and everything seems fine.

I had to give the manual ECU back to the guy so now im using my auto ECU and instead of code P0443 I get code P1445(evap canister purge volume control valve) along with the auto transmission malfunction code.

I decided to just take my car into a shop to have it looked at and explained everything to the mechanic. He looked everything over and could not find anything wrong.

He suggested the wiring might be wrong somehow since I'm getting two different codes with two different ECU's which should not happen.

Also code P1445 comes back IMMEDIATELY after being cleared.
I don't even start the engine and I have code P1445. With the manual ECU I was able to drive about 5 miles before code P0443 showed up.

Why would I get different codes with different ECU's?!?!?!?!

I know people have done manual swaps in their OBDII cars and have not had this issue.

Does anyone make a OBDII check engine light eliminator for our cars? ANY possible way around emissions or info on how to fix my car is greatly appreciated.

If you find a reasonable solution for passing emissions I will send you $10 through paypal or money order... whichever you prefer.
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