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Pectel SQ6 internal battery replacement

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Previously the ECU has been back to AMR / Cosworth to be "serviced" and have the internal battery replaced however they are not being very responsive and we have a dealine looming - has anyone got any experience of a DIY on this?



Sorry I can't help on DIY replacement, although I'd be interested to hear if this is possible. We have a local car here with a Pectel that has had the ECU back to the UK several times now for this exact problem which is time consuming and frustrating.

Sorry, only done T6's

I've struck the same issue, and attempted to get access into the SQ6M in question, but after removing all the screws, I was having to pry on it pretty hard and still wasn't getting any movement. I called it quits at that stage and organised for it to be sent back. Would be a pretty expensive ECU to damage :-/.

I've had good luck getting responses on Cosworth's customer support forums (http://support.cosworth.com/), might be worth a try if your other channels are coming up empty?

Thanks guys - we also tried to open the case but it wasn't forthcoming and we came to the same conclusion that it would be an expensive error if there is some special procedure to open it - I guessed it as just hermetically sealed with some kind of mastic or something - I can't see this can be a difficult procedure but can't afford to experiment on it to be honest!

Still no response from Cosworth but AMR are going to lend us a spare for this event. Will update here if we uncover any knowledge about it.


Same issue. Seems the ECU loses PPS/TPS Autocal data if the internal battery won't hold charge. Why the hell is that written to volatile memory?

Does anyone know if the SQ6M internal battery has a charging circuit (from the vehicle)? One source tells me yes, another says no. Either way, I've left the ECU powered overnight and it hasn't made a difference.

Hi Chris,

I work for Pectel, and confirm SQ6 platform does not have a rechargeable battery.

MQ12Di etc and newer platform however do.

You can contact returns@cosworth.com and arrange for it to go back or fill out the returns form on the website - https://www.cosworth.com/contact-us/#returns

If the battery runs flat traditionally you should only lose your logging table config etc.

Thanks for that Rob, will do. What I can tell you is that PPS and TPS recorded voltages and curves from Auto-Cal are lost once the ignition is turned from the accessory position to off. Can you think why that would be if not the battery?

Battery replaced (£420), AutoCal redone and now remembers PPS to TPS cal.

420 pounds for battery replacement????? Ouchhhh.....It was mentioned a few posts above that SQ6 does not have internal battery....

Every when does to have it's battery replaced?

Nobody said it doesn't have a battery, just that it doesn't have a charging circuit.

Apparently expected life is circa 5 years.

If it runs flat (and apparently the longer it remains so) weird (and weirder) things can happen including, it would seem from my experience, the loss of calibration data which should be written to non-volatile memory. This assertion is corroborated by Mick Kehl.

We usually reply within 12hrs (often sooner)

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