How long does a code stay in memory *LONG* - JeepForum.com

 
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post #1 of 9 Old 07-17-2009, 06:49 AM Thread Starter
Death-Mobile
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How long does a code stay in memory *LONG*

I've been battling a trans issue for a long time now. I had been getting a P1763 ever since installing a new valve body with a transgo kit. Recently I dropped the pan (already swapped out sensors twice before)...and turned the line pressure down. For about 2 hours of driving, the code was gone! I thought I fixed it. Well...my girlfriend called me to tell me the code came back. I cycled the key switch and now instead of just P1763...it has P1763 AND P1762.

A little history: I had kept the pressure cranked up after I replaced the sensor and solenoid, and installed a 150ohm resistor in the signal wire as transgo and various people suggested.

Is it possible that the P1763 is a stored code? The problem is that I had disconnected the battery prior to this and let it sit for about 45 minutes. I thought that would clear the code. Does the old code come back when another trouble code is triggered if you never cleared it with a scan tool?

The reason I ask is because this is either going to make me happy, or very angry. If it's only a P1762...I am on my way to fixing it. I would just have to remove the 150 ohm resistor or crank up the line pressure a little more to even things out. If it is a P1763 AND P1762...I am at a loss. I never had P1762, so I obviously did something by adjusting the line pressure.

Here are my thoughts if that P1763 is NOT a stored code: APS used an older 42RE valve body (pre98)...and it needs to be flashed. (There was a TSB about an erroneous MIL for P1763 on pre 99 valve bodies) Interesting because the code came as soon as I slapped the body on the trans. It's very random, although inclines seemed to trigger it more often. I have also read that a disrupted ground can cause both codes, which usually comes from a bad 02 sensor. However, I don't have any codes for an 02 sensor, and it's about 300 dollars to replace them....

I am REALLY hoping it is a simple issue of line pressure. It was too high, and now it's too low. A small tweak to fix....however I don't know if that P1763 is an active code (regretfully...I think it is).

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post #2 of 9 Old 07-17-2009, 07:55 AM
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Erase the codes. Then if P1763 comes back, you will know that it represents an actual problem with the voltage. Many code readers will erase them, disconnecting the battery for a while is reported to do it, disconnecting the negative battery cable and then holding the key in the start position for about 20 seconds is said to do it. I've never had to do erase codes, so I've never tried any of those methods.
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post #3 of 9 Old 07-17-2009, 10:10 AM
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It should be as simple as erasing the code with your code reader. Then if it comes back you'll know that it is still an issue. I've seen codes last for months without being erased.

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post #4 of 9 Old 07-17-2009, 01:29 PM
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I think it is 50 key cycles on a ZJ, I don't know what it is on a WJ though

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post #5 of 9 Old 07-17-2009, 04:41 PM
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pull the battery and turn the key on to discharge the energy stored in the pcm caps. it is now a "fresh" pcm with no adaptive memory or codes stored.

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post #6 of 9 Old 07-18-2009, 01:06 AM
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Quote:
Originally Posted by ratmonkey View Post
pull the battery and turn the key on to discharge the energy stored in the pcm caps. it is now a "fresh" pcm with no adaptive memory or codes stored.
x2 :2thum bsup:: 2thumbsup:

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post #7 of 9 Old 07-18-2009, 08:50 AM Thread Starter
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oh cool. i'll do that later today and get back. i had a feeling that the pcm held things in memory even if the battery was disconnected for a while.
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post #8 of 9 Old 07-18-2009, 02:16 PM
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Disconnect the negative batt. cable for a few minutes and reconnect the codes will be cleared! If they come back its time to look into the reason and correct! Good Luck!!!
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post #9 of 9 Old 07-20-2009, 06:47 AM Thread Starter
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Well...I took off the breather I put on the extended vent line I made for the trans. Seems as though the code hasn't come back. Either 1762 or 1763. I put the breather back on...and P1763 came on while on an incline. Maybe it's a coincidence. Line pressure is only at 2 turns in, AND I have the resistor in place, so 1763 can't be caused by the actual setting in the body. The fact the P1762 came on that one time must be for the setting being out of whack, not low, because I don't know how ONLY P1763 would come back now. This is a damn nightmare. I'll let it go for a while without the cap on the breather hose and see what it does. The next step would be to go to a dealer and have them flash the computer.
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