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Old 10-05-2007, 11:45 AM   #1
tspoof
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Default Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

Can anyone point me in the direction of instructions for replacing the Pressure Control Solenoid in the automatic transmission of a 99 Saturn SL1 (w/80K miles)? I've searched and searched, but cannot find what I'm looking for. I have instructions on replacing the valve body. And I understand the solenoid is part of it. Is it a straight forward matter of pull the valve body, swapping the solenoid, and reinstalling?

My '99 SL1 AT has been diagnosed as having a bad Pressure Control Solenoid (per dealer, code PO749). A replacement should fix the shifting slam into all gears problem the transmission is having once it warms up (forward and reverse). The Pressure Control Solenoid shorted out.

[I do not have the typical reverse slam problem, and when it's cold it works fine.]

The solenoid is a $650 fix at the dealer, I plan to do it myself. Supposedly the valve body is still good; the shaft nuts may need to be re-torque, but I've driven it very little since this started.

Any help would be much appreciated.

Cheers

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Old 10-05-2007, 03:13 PM   #2
plastic torpedo
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

Hi, you've emailed me on eBay.
If you have slam in all forward gears once it warms up, then it's definitely the line pressure solenoid. That solenoid works the hardest as it constantly opens and closes at different frequencies to create the appropriate line pressure.
The easiest way would be to replace the valve body. I'm not just saying it because I want to sell you a valve body either. $600 is too much.

There are 5 solenoids in the valve body, the TCC solenoid, 2nd, 3rd and 4th gear solenoids and PWM (or line pressure solenoid). The procedure is pretty straightforward, it requires taking out the valve body and taking it apart. There isn't anything in the valve body that's going to fly apart and get lost, just do it carefully and watch for two small springs with bearing-type balls on them, those two suckers tend to fly out, but the valve body is fairly idiot-proof.

If you find just the solenoids, which are cheaper than the valve body, then definitely rebuild your valve body. You will have piece of mind and will save a ton of money.

Driving the car with gears slamming may cause stripped gear teeth. This happened to me when I was trying to raise the line pressure and make the automatic manually controlled through a piggy-back circuit. It'll still work, but will make funny noises. But mine was set to maximum line pressure, and if yours works fine when cold then it's probably not something to worry about for now.

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Old 10-05-2007, 03:34 PM   #3
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

No need to remove the entire valvebody,to change an actuator .
this can be done inside the unit ,by removing the top pan ,and taking out
the high level bolts holding the buss plate .
once the plate is removed any actuator ,or all of them can be changed .
someone recently posted the layout for the actuators ,if can't find it
P M me with e-mail address ,will shoot the pic back !

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Old 10-05-2007, 05:14 PM   #4
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

Is #25 the actuators?

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Old 10-05-2007, 06:49 PM   #5
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

YUP !
and #26 is the buss plate ,should check this for poor connections
where the actuator terminals connect,as well as the wire plug conn.

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Old 10-05-2007, 07:21 PM   #6
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

So I'm pretty much commited now...I got it all apart.

Which one is the pressure control solenoid? 1, 2, 3, 4, or 5.
I beleive it is #1 (on the bottom).

Also, is the Pressure Control Solenoid also known as the "Line Pressure"? Thank you so much.

Last edited by tspoof; 10-05-2007 at 07:33 PM..

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Old 10-05-2007, 07:40 PM   #7
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

in your posted picture
line pressure is #1
#2 is shift solenoid 2
#3 is tcc solenoid
#4 is shift solenoid 3
#5 is shift solenoid 4

the manual says to reset adaptives after changing the line pressure solenoid
I'm not sure how to do that without a Tec 2 tool
in any event make a few dozen low & medium throttle shifts through all the ranges before making any full throttle shifts to allow the adaptive feature to tune in your shifts

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Old 10-05-2007, 07:43 PM   #8
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

Yes it is # 1
#2=2nd
#3=tcc
#4=3rd
#5= 4th by your illustration !
You should have pics from Kodak image

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Old 10-05-2007, 07:49 PM   #9
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

Resetting Adaptive Parameters

Because the PCM has the ability to adapt to various transaxle conditions, it is necessary to reset the adaptive parameters after certain repairs have been performed. The adaptives can be reset using the Service Stall System (SSS) or using a Scan tool. The adaptives should only be reset after the following repairs have been made:

-Replacing a transaxle
-Replacing a TCC or PC solenoid
-Transaxle overhaul when new clutch plates are installed
-Replacing a valvebody
-Replacing the PCM for a transaxle related failure


Important

When replacing the PCM for an engine related problem the transaxle adaptives should be transferred from the old PCM to the new PCM.



After performing a repair, the vehicle must be driven to allow the adaptives to learn new shift times and pressures before returning the vehicle to a customer. Refer to Learn-In procedure below.


Learn-In Procedure:

If one of the repairs mentioned has been performed, then the adaptives should be reset using the SSS or using a Scan tool. Also, the vehicle must be driven, preferably on a highway, according to the following steps. By following these steps, the adaptives will be properly learned prior to returning the vehicle to the customer.

1. Warm up the transaxle fluid temperature above 45C (113F).
2. Perform 10 sets of upshift (1-2, 2-3, 3-4) at 30% throttle:
----For DOHC (LL0) Engine
******While coasting at 56 km/h (35 mph) slowly accelerate to half throttle to achieve a 4-3 downshift.
******With selector in D3 while coasting at 32 km/h (20 mph) slowly accelerate to 75% throttle to achieve a 3-2 downshift. Repeat both procedures five times.
----For SOHC (L24) Engine
******While coasting at 64 km/h (40 mph) slowly accelerate to half throttle to achieve a 4-3 downshift.
******With selector in D3 while coasting at 48 km/h (30 mph) slowly accelerate to one half throttle to achieve a 3-2 downshift. Repeat both procedures five times.

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Old 10-06-2007, 01:14 AM   #10
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

Alright! I didn't know you could replace single solenoids. I never had to
But hey that's pretty cool

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Old 10-06-2007, 03:55 PM   #11
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

Job complete. $70 (for the solenoid) and ~5 hours later the problem is solved.



My buss plate looked good so I did not replace it ($160).

Thank you everyone for your help.

Last edited by tspoof; 10-06-2007 at 04:01 PM..

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Old 10-06-2007, 04:28 PM   #12
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

Would you follow the same procedure for a 97 SW2?

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Old 10-07-2007, 01:33 PM   #13
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

Quote:
Originally Posted by OU812 View Post
Would you follow the same procedure for a 97 SW2?
BUMP.......

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Old 10-07-2007, 05:14 PM   #14
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

yup, same valve body

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Old 10-08-2007, 05:33 PM   #15
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Wrench Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

I made and posted a YouTube video of my solenoid replacement. My way of giving back for all the help I received. I suppose it could also be helpful to people doing a valve body replacement.

http://www.youtube.com/watch?v=JUSSj_2eHUY

Let me know if you have any questions.

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Old 10-08-2007, 06:21 PM   #16
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

Nice video, i bought the solenoid today so ill give it a shot this week

Thanks

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Old 10-08-2007, 08:36 PM   #17
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

Great work. I like the bolt holder template to assure correct reassembly.
Novice mechanics take note.

Your trans looks nice and clean inside too.

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Old 04-01-2008, 11:31 PM   #18
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

This topic was very helpful to me.

My wife's SC2 started slamming every gear last Thursday out of the blue. I also found a leaking trans cooler line as well. I changed the line without any fix so I searched up transmission stuff. I found this topic and video so I decided to give it a shot since it looked like a piece of cake (I installed an engine by myself last fall in my 96 SL2). I went to the junkyard on Monday morning, picked up a valve body from a 93 SL2 for $20. After getting home from school, I took her valve body apart and disected the 93 unit. After checking everything to make sure they were interchangable, I swapped the line pressure solenoid and took it for a spin. Problem solved. Whole repair was done in about 45 minutes.

She says it is shifting very smooth now.

This thread really helped me save a bunch of money.

Thanks
Now I just have to address the reverse slam in the 96. :lol:

...
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Old 04-02-2008, 02:29 AM   #19
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

Quote:
Originally Posted by tspoof View Post
Can anyone point me in the direction of instructions for replacing the Pressure Control Solenoid in the automatic transmission
Sorry I wasnt on earlier:/
http://www.youtube.com/watch?v=JUSSj_2eHUY
Video provided by someone OTHER than richpin

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Old 04-06-2008, 10:08 AM   #20
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Default Re: Transmission Pressure Control Solenoid replacement (99 SL1 A/T)

This thread matches my exact problem. Does anyone know of an online parts store so I can order these solenoids? AUTOZONE here is useless, I can try NAPA tomorrow when they open. Thanks a bunch!

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