Polo 6n mp9 Ecu issues

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Lahrifive
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Polo 6n mp9 Ecu issues

Post by Lahrifive » Wed Jun 06, 2018 10:32 pm

Good evening guys new to the forum
Having a problem with my polo Playa 6n millennium dash 2001 model
OK I fitted a 2.0 16v 9a motor and currently using my original 1.6 mp9 Ecu didn't wanna go the aftermarket route so I managed to get hold of a mp9 Ecu that's chipped for the 16v motor but as soon as I plug the box in the car it will start as soon as I pull off it cuts out and dies I then decided to remove the speedo sensor on the gearbox then the car is able to drive no issues but then my cluster Rev counter goes berserk will remain at 3000rpm but idles normal so guys how can I solve this issue as I don't want to go aftermarket please share some advise and make my evening
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PapaJo
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Re: Polo 6n mp9 Ecu issues

Post by PapaJo » Sun Jun 10, 2018 5:05 pm

Sounds like the chipped box is not liking the speed sensor input and affecting the operation on it. Then with the speed sensor disconnected, you are creating an open loop to the cluster and its electronics.

Did you check with speed sensor connected that cluster and rev counter is acting normal?
Lahrifive
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Re: Polo 6n mp9 Ecu issues

Post by Lahrifive » Mon Jun 11, 2018 9:28 am

Thanx for the reply
Yes I did plug the speed sensor in while the chipped box is plugged but revs stays at 3000 rpm doesn't lower or go higher but car idle normal but when the car is driven cuts out.
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Re: Polo 6n mp9 Ecu issues

Post by Lahrifive » Mon Jun 11, 2018 9:31 am

Ja and if the the chipped box is plugged in and speedo sensor removed the car drives revs stays on 3000rpm but then oil light starts making noise
Isn't there a wire on the polo mp9 harness that can be chopped off to cure this problem car feels like a donkey cart with the oem 1.6 ecu and don't wanna go aftermarket.
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PapaJo
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Re: Polo 6n mp9 Ecu issues

Post by PapaJo » Mon Jun 11, 2018 10:04 pm

No way to chop a wire. The oil buzzer warning is a resukt of the RPM value higher than 2000 RPM. Where is the oil sensor wire connected and is that connected to the high pressure switch or low pressure switch. Some models have both switches and some only the high pressure switch. What is the colour code of wire connected to the oil pressure switch?
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Pynoxim
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Re: Polo 6n mp9 Ecu issues

Post by Pynoxim » Tue Jun 12, 2018 9:54 am

I had the same issue when I did my 2.0 swap in my Polo and got my Polo Cup ECU, turns out there are some things that need to be changed on the ECU side when you have the Millenium Dash installed, so find someone who is able to do it for you. Here in CPT we use a guy named Allen, he's the MP9 guru, I got my ECU from him and had to take it back to him when I had those same issues with my car, he mentioned that I need to inform him if I have a millenium dash.
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