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Old 06-05-2005, 09:18 AM   #1
Blue Thunder
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2000 L-Series 3.0L Wagon
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Default Hard Shifting, Wrench Light, SES Light problems

Hi there;

I've been scouring this board for info on fixing my hard shifting problem. I've found this forum to be very helpful. Let me give you a little background:

My LW2 has had trouble in the past with the P1811 code / Transmission Pressure Solenoid. I had the solenoid replaced (twice) and the second time it held up for over 10,000 miles. A couple months ago the "wrench" was back and then the SES light came on shortly thereafter. The second time my dealer replaced the TPC solenoid, they said that I had probably damaged the transmission by driving it with the wrench light on, and therefore I would need a new transmission. It's a good thing I didn't sign up for that procedure! I call it "Warranty Nullification" - they just wanted to make sure they didn't have to replace it again.

Skip forward 8 months to today: I followed the suggestions I found here regarding the MAF sensor. I gave it a cleaning and reset the computer. I drove it about 3 miles and the SES light came back on. It ran terribly, wouldn't downshift correctly and started with difficulty. I tried cleaning the MAF sensor again with a different cleaner and reset the computer again. This time it ran quite a bit better - the SES stayed off for about 20 miles before it came on during hard acceleration. Now the strange part - the car is running and shifting like it's supposed to! Lots of power, downshifting good, everything! Since I started this whole MAF operation, the wrench light hasn't returned.

Now for my question: The SES light is on again - even though the car seems to be running fine. If I wait, will it go out by itself? Should I reset it again?
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Old 06-05-2005, 10:11 AM   #2
itsmesillybubba
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Default Re: Hard Shifting, Wrench Light, SES Light problems

try reading the ses code again
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Old 06-05-2005, 12:22 PM   #3
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Default Re: Hard Shifting, Wrench Light, SES Light problems

Codes would be good to have. As for cleaning the MAF sensor you are not really supposed to do that. Not good for it. If the problem that caused the SES light to go on is gone then the SES light will eventually go out on its own, It can take a good number of ignition/driving cycles. I beleive that there is an updated program for the PCM to deal with potential MAF problems. May be worth looking into getting the PCM reprogrammed if the SES codes are MAF codes.
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Old 06-09-2005, 08:08 PM   #4
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Default Re: Hard Shifting, Wrench Light, SES Light problems

Quote:
Originally Posted by ssicarman
Codes would be good to have. As for cleaning the MAF sensor you are not really supposed to do that. Not good for it. I beleive that there is an updated program for the PCM to deal with potential MAF problems. May be worth looking into getting the PCM reprogrammed if the SES codes are MAF codes.
Well, I guess you're right. Two days after I cleaned the MAF sensor it completely quit working. I ended up having it replaced and the PCM reset. No problems since then - including the transmission.

How do I find out what the "latest" firmware version is for my car? Or if I have it?
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Old 06-09-2005, 08:27 PM   #5
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Default Re: Hard Shifting, Wrench Light, SES Light problems

The only way that I know of is with a tech 2 scan tool with the programming in it from Saturn and then the programming system (computer) from Saturn with the newest PCM updates in it.
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