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AD4/DPO Autotransmission solenoids compatibility and more

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Old 20th October 2009   #1
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AD4/DPO Autotransmission solenoids compatibility and more

Hello All,

I have a megane 1997, K7M motor, AD4 A/T.
It has been acting up lately with several weird symptoms, eventually traced down to an intermittent A/T control solenoid (Electro-pilots as they're named by Renault), from now on I'll call them gear selecting solenoids (GSS).

The problem is that this solenoid comes as part of a harness including 4 GSS's, 1 pressure modulating valve (PMV), and a temp sensor, all amounting to big $$$$$ (to be specific, over 1000 including work...).

To avoid the hefty cost my gear specialist installed a GSS from a DPO A/T (also called AL4 in Peugeot-Citroen). They look physically the same, but the DPO solenoids can be bought in single units much cheaper (1/16 the cost!) and soldered into the old harness (the DPO harness is modular and has connectors for each, as opposed to AD4 which is one-piece).

I've measured and compared resistance readings of both GSS's (DPO snd AD4) and they seem very similar also electrically (30ohms AD4 vs 40ohms DPO), and moreover, the new DPO solenoid works just fine in my AD4. On the other hand, I've read in various places that not all solenoids from both A/T systems are compatible, e.g. the PMV's are not, because they are designed for different pulse widths. I've even found that even **within the DPO line** there was a change of pressure modulating valves during production life, that requires ECU reprogramming for the newer units if installed. *copy righted material removed

Analysing the doc, it seems that they're talking about two PSV's (one for A/T system pressure control and the other for torque converted locking mechanism not present in AD4) and not the gear selecting ones. As far as I could understand, the PRV's are pulse-width-modulated by the A/T ECU at high speed to to regulate the required A/T pressure based on the external pressure sensor output, hence must act very fast. On the other hand, the GSS's change only at gear shifts and are otherwise static.

Has anyone tried and can confirm that DPO GSS's are indeed compatible with AD4 in the long run?
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Last edited by Devils Laguna; 20th October 2009 at 02:30 PM.
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Old 20th October 2009   #2
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LOL, I see that I have used three different acronyms for the same thing...
PMV = Pressure modulating valve
PSV = Pressure stabilizing valve
PRV = Pressure regulating valve

They actually all mean the same thing...see pic named "DPO PWM SOLENOID".

And to our dear moderator: I've included in my above post a link to a pdf doc on a commercial website with the DPO/AL4 blowout of parts pictures and names, with the relevant comment about the compatibility issue and necessity of ECU programming, as well as attached the doc to my post. Both were deleted from the post. I now understand that attaching a commercial doc might constitute a copyright issue, but are links to external websites also prohibited here? Can I at least quote the remark about the compatibility issue?
Thanks.
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Old 20th October 2009   #3
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You should be OK to partially quote and link the site as it's in context of the thread

If we have a big issue, we'll take it out.
Thanks for asking
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Old 20th October 2009   #4
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Quote:
Originally Posted by Pat.w View Post
You should be OK to partially quote and link the site as it's in context of the thread

If we have a big issue, we'll take it out.
Thanks for asking
OK, here goes...:
http://www.automaticchoice.com/Catalogue/dp0.pdf

notice the big red remark at the end of the doc (I tried but the doc doesn't allow copy and paste...so I'll attach a screen capture).
We're talking about the EPC and Lockup solenoids (parts 700G and 701G respectively). The GSS's are parts 702G.

also, note the AD4 blowout here:
http://www.automaticchoice.com/Catalogue/ad4.pdf

here we're talking about part 703G (solenoid set).
I'll attach a pic of that too here. Each solenoid in the pack is permanently attached to heat resistant (teflon coated?) wires and soldered to the sealed connector exiting the A/T case.
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ad4 dpo al4 solenoids, ad4 or dpo, autotransmission, compatibility, solenoids

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