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Discussion Starter #1
Hi all

I have recently purchased an 03 plate 307 SE Automatic and am having a few issues with the gear box that I would appreciate your thoughts on.
When I set off in the morning the gear change isn't at all smooth and, at times, the engine revs up to about 3,000 rpm as it changes up. If i drive really carefully it seems I can avoid the worst of it. After a minute or so all is OK. However, this evening the car twice gave a loud 'clunk' when pulling away from a junction. There are no warning lights on the dash so I am unsure if it is my driving or the car!
Thanks in advance
Vince
 

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Discussion Starter #3
Thanks Gibbo
I wasn't sure if there would be an error code for anything other than engine faults or if there was no error showing on the dash.
 

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It is only a possibility, but there are two solenoids which can cause malfunctions. I have researched and found some information, but, like everything on the internet, it needs to be treated with caution. Not everything is correct.

The solenoids have been replaced with improved ones made, I believe, by Borg-Warner. The original solenoids function at 50Hz, but the new ones work at 100Hz. The transmission ECU needs to have it's firmware updated to achieve this. The update has to be performed by a Peugeot dealer, whose test equipment can access the Peugeot server in France.

Here's a video showing the solenoids being changed. Here's another. Here's a link link to the workshop manual for the AL4.

There are some (or one?) auto transmission specialist(s) in UK who know all about this and can perform the update - i assume they have the same privileges as Peugeot dealers. I think they would be a better bet, as they have the experience, whereas the average dealer would be working from the Peugeot documentation and you would be paying for his learning curve.

I did see a thread where someone had the solenoids changed but, unfortunately, he didn't say who by. I suggest some enquiries of auto transmission specialists to find one who has the experience of AL4 transmissions and would give a realistic quote.
 

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Discussion Starter #7
No change..yet

Thanks all for the advice.
I haven't had any diags run on it yet as I just have not had the time due to work commitments, family, etc, also need to get my post count up to 20. Solenoid was my first thought as at times I have had a clicking sound from the gear box when I have started up. Hopefully that should all change in the next couple of weeks. Will keep you all informed.
Thanks again
Vince
 

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Hi Vince,

Good luck and keep us posted - My AL4 is ok at the moment, but one fears for the future....

Btw, post here to get your count up to twenty.
 

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From the second screenshot, it appears that data is not being received by the AT ECU from the Engine ECU via the CANBUS.

It could be helpful to check that the Engine ECU, AT ECU and BSI and all connector plug/sockets are clean and dry. Use a suitable electrical cleaning spray, such as DP60. Don't use "traditional" WD40 - it leaves a sticky residue.

I don't have a 307, but I think the AT ECU is on the engine bulkhead behind the transmission, the Engine ECU is just behind the LH headlamp, and the BSI is the passenger compartment fusebox.
 

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Discussion Starter #14
Thank you

From the second screenshot, it appears that data is not being received by the AT ECU from the Engine ECU via the CANBUS.

It could be helpful to check that the Engine ECU, AT ECU and BSI and all connector plug/sockets are clean and dry. Use a suitable electrical cleaning spray, such as DP60. Don't use "traditional" WD40 - it leaves a sticky residue.

I don't have a 307, but I think the AT ECU is on the engine bulkhead behind the transmission, the Engine ECU is just behind the LH headlamp, and the BSI is the passenger compartment fusebox.
Thanks Ian

Just a couple of questions.
Do you think cleaning the connections will resolve the gear change issue or is this to resolve an issue reading the codes?
Do I need to do anything other than pull of the connectors, clean with contact cleaner, then plug them all back (disconnect battery. etc)?
 

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Do you think cleaning the connections will resolve the gear change issue or is this to resolve an issue reading the codes?
I am hoping it is both.

Do I need to do anything other than pull of the connectors, clean with contact cleaner, then plug them all back (disconnect battery. etc)?
Do that for a first step. Are you aware of the drill for disconnecting and reconnecting the battery - if not see BSI Reboot Process for Peugeot

If that does not cure the problem, I would open each of the boxes, looking for damp, corrosion or damage.
 

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Hi all

I have recently purchased an 03 plate 307 SE Automatic and am having a few issues with the gear box that I would appreciate your thoughts on.
When I set off in the morning the gear change isn't at all smooth and, at times, the engine revs up to about 3,000 rpm as it changes up. If i drive really carefully it seems I can avoid the worst of it. After a minute or so all is OK. However, this evening the car twice gave a loud 'clunk' when pulling away from a junction. There are no warning lights on the dash so I am unsure if it is my driving or the car!
Thanks in advance
Vince
Not sure if this helps but I used to drive the works Astra 1.8 pool car and that was an auto and it used to be quite high in the revs first thing in the morning. According to the handbook its was a normal thing to experience as the engine revs higher to get the cat up to temp.

Not that this helps with your clunks. But, it might be your just noticing the revs because your looking for a fault when they might be quite the norm?
 

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I'm think that intermittent loss of throttle potentiometer data coupled with unexpected revving to 3000 rpm are not a coincidence.
 
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