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Old 18-09-18, 06:28 AM   #1
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Default AL4 gearbox...

Hello all,
I have a problem with the best gearbox ever made, the AL4. So the story goes like this:
I changes the oil as i was suspecting it to be really old, i did not use esso lt 71141 or the mobil lt 71141. what i used is one from a local car part chain, i got this one because it was easier to get a hold of than fro mobil, it is specified to meet the LT 71141 standard and therefore i went for this one.
This is the oil, sorry the website is in norwegian.
https://www.biltema.no/bilpleie/moto...-4l-2000036319

Anyway it was driving like a dream for around 4 months after the oil change, untill i let my brother in law use my car while i went on a two week vacation. My sister called me and says the car stopped and gave an alarm when her husband was driving it up a really steep hill with a 2000 kg trailer on the back(not good at all) but later on talking to my brother in law he says the car didn't stop, he just realized the car would not be able to pull, so he turned the car around.

The problem itself is that the gearbox is "slipping" it does not lock into gear when it is up to speed like it used to, i am driving on the torque converter the whole time and it never locks. The gearbox shifts gear like normal, all gears are used but not locked. when i release the throttle the RPM goes down to idle.

Another thing is when i start the car, and do not drive right away, the "Shifter" is locked in P and i cannot change unless i turn the car off and back on.

i do not suspect that the oil quality is the problem here as it was fine for 4 months, but maybe a solenoid valve is faulty?

im thinking of changing the oil to mobil lt 71141 just to try it out, maybe it will fix it.
and if it does not help, then i will change all the solenoid valves and give the control system a good clean.

PP2000 does not give me any fault codes.

has anyone experienced this before?
Any idea as to what i can do?
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Old 18-09-18, 08:13 AM   #2
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We have two 206s with AL4 boxes, and we love them. I agree that solenoid valves are the most likely cause. It may be the oil, or it may be simply the act of changing it disturbed some small pieces of brake surface which had broken off, and they are now blocking the fluid channels to the solenoids. I have read that this can happen.

I think, with the AL4, it is better to follow the dictum, "If it isn't broken, don't fix it".

Be aware that early AL4 solenoid valves were actuated by 50Hz signals, and this was upgraded to new valves (from Borg-Warner) which require a software upgrade to the AL4 ECU to excite at 100Hz. I think you will need to go to a specialist for that, as I don't think it can be done with PP2000.

Last edited by IanML; 18-09-18 at 08:17 AM.
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Old 18-09-18, 08:14 AM   #3
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The fact your shift lock is not working correctly makes me think its something electrical check the brake switch connections as the gearbox needs these signals to work correctly.

Sounds like your brotherinlaw may have worked it a bit hard too though
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Old 18-09-18, 04:16 PM   #4
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Quote:
Originally Posted by reliable406 View Post
The fact your shift lock is not working correctly makes me think its something electrical check the brake switch connections as the gearbox needs these signals to work correctly.

Sounds like your brotherinlaw may have worked it a bit hard too though <img src="https://www.peugeotforums.com/forums/images/smilies/smile.gif" border="0" alt="" title="Smile" class="inlineimg" />
You might be on to something there, i just checked my brake lights and the are not working, the normal red lights are on but not brake lights. One of the bulbs is out though, right side on the back door, can this cause the brake light to not function? Should it go one further step and check the switch by the pedal right away or change the bulb first?
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Old 18-09-18, 04:32 PM   #5
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It seems that the heavy trailer overloaded the transmission. It would probably happen anyway but in later time.
Seems like a selonoid. You should go to a auto transmission spacialist for diagnosis

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Old 20-09-18, 07:19 PM   #6
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Tank you guys for the help, i finally found the fault, after seeing the break lights not working, i checked the brake switch on the pedal, the were two switches and i check both, working fine. Then i measured current going to it and it was 6v on one and 1.5 on the other.

I then decided to check the fuses and found a broken fuse, i replaced it and everything is working fine again, yay.
Gearbox is shifting and licking into gear, break lights are working, and i can get the gear lever out of P without restarting the car.

It's weird how something like the break light fuse can cause so much trouble, anyway i have learned to ALWAYS check fuses first.

I now have a happy pug!
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Old 20-09-18, 08:50 PM   #7
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Brake light fuse also controls the interlock solenoid on the stick and powers the gearbox
ecu your problem was as i thought electrical but i still say your brother in law is a twat for overworking the box

It might be worth an oil change to get any worn material out the oil.
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