41TE Symptoms

[Mealticket]

Make

Chrysler

Model

PT Cruiser

Year

2004

Miles

200,000

Engine

2.4

All - let me know if you have ever come across the following on a 41TE: 'It drives for 10-20 miles at a time before the transmission gives out. It then needs to be off for a while and then it will run again.'

Thanks,

MT

 

[billr]

Hmm... it is time for me to summon our trans expert (bp).

 

[bp042665]

ok i have seen this a few times it could be the cooler bypass valve or a loose filter the cooler valve is behind the pump so it is hard to check but what i do is find the pressure line and try to blow air threw it a few times to clean out any trash its the line closes to the front of transmission

 

[Mealticket]

Thanks guys. bp042665 - yes, I am familiar with that cooler bypass valve. I'll check the filter closely first, then shoot air in as you say. This car has 200K miles on it, and maybe it's never been serviced. I should have the car tomorrow or Friday. I'll close the loop on this when I get resolution.

MT

 

[nickb2]

wow that was easy

 

[Mealticket]

So on my first test drive I heard whining in 1st and 2nd, but ok shifting. I could not duplicate the issue, but didn't really think I would. Then I dropped the pan and found the most hideous, nasty fluid ever and plenty of small metal, including in the small exposed section on the filter. The filter had the Mopar pentastar symbol, and was in its' proper position. I suspect it's all original, with 205K miles on it. The tranny would appear to be the one area of this car that was not meticulously maintained. Did the service with ATF+4 and filter, and I don't hear the whine now, and it shifts fine. I have not yet had a chance to pull that cooler line and blow air in as bp042665 recommended but will do so. The CEL is NOT on, and all monitors have completed.

Anyway...it appears that my Launch123 scanner actually has the ability to pull some advanced tranny codes. So I went into that module and was surprised to get P0732 (gear ratio error in 2nd) and the dreaded P1790 (fault immediately after shift), but for both, status is blank, rather than saying 'active' or 'pending'. From my limited experience and some documentation, I know that the P1790, when coupled with any gear ratio fault code, usually means internal damage. It never points to electrical, but I pretty much knew that. So the 64-dollar question for bp042665 is; have you ever gotten P1790 due to clogged filter or cooler bypass valve? I don't want to clear those codes out yet and see if they come back, as I need to smog this. Thanks,

MT

 

[bp042665]

yes a clogged filter i have seen . can you check the CVI value's on this

Theory of Operation: The volumes of the transmission fluid needed to apply the friction elements are continuously monitored and learned for adaptive controls. As the clutch friction material wears, the volume of fluid needed to apply the clutch increases. The following are typical clutch volumes, the clutches may be damaged if the volumes are greater or less than the specified below:

The LR clutch volume is updated when doing a 2-1 or 3-1 coast down shift. The transmission temperature must be between 21-49°C (70-120°F). The clutch volume should be between 35 and 83.

The 2/4 clutch volume is updated when doing a 1-2 shift. The transmission temperature must be above 43°C (110°F). The clutch volume should be between 20 and 77.

The OD clutch volume is updated when doing a 2-3 shift. The transmission temperature must be above 43°C (110°F). The clutch volume should be between 40 and 150.

The UD clutch volume is updated when doing a 4-3 or 4-2 shift. The transmission temperature must be above 43°C (110°F). The clutch volume should be between 24 and 70.

Transmission effects: These codes usually set with other DTC's, which indicates an internal transmission problem.

 

[Mealticket]

bp042665 - my scanner does not read CVI. If necessary, I can get CVI from my local tranny shop for a reasonable fee. However, I would love to have that capability so let me know if you know of any low cost scanner I could buy that has it.

In this case, I think I'll blow air in that cooler line as you suggested, then put a good amount of miles on the car and see if anything bad happens. Once I smog it, I will clear those codes, and see if they come back. I suspect they will not. Thanks for your help,

MT