No Start after ECU tune

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Jan 9, 2015 | 04:58 AM

ainain

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Joined: Dec 2014

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S600 2007

No Start after ECU tune

I have S600 2007 W221 sent my ECU for tuning to get better performance.Got it today and when i put it back car wont start dash lights come on but nothing happens when i turn the key to position 3.checked the battery its fine when i switch to position 3 fans start running at full speed!
Any suggestions? ECU? car security?
Thanks in advance

Jan 9, 2015 | 06:41 AM

lganski

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Joined: Nov 2012

Posts: 220

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From: New England

2006 S430 4Matic

Welcome to the forum. You will have to have to have a diagnosis done with the star system. Sounds like something was changed that the system does not like.

Jan 9, 2015 | 08:33 AM

loungn14

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From: Houston/ Austin /Toronto / UAE / Minneapolis / Orlando /Cincinnati

Eurocharged Performance ML63 and TT lambo

Quote:

Originally Posted by ainain

Triple check that you have the electrical connectors on correctly and fully seated until you hear the click

Jan 9, 2015 | 12:09 PM

DaveW68

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From: Chicago burbs

2015 S550

Who did you use for the tune?

Jan 9, 2015 | 01:30 PM

ainain

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Joined: Dec 2014

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S600 2007

Quote:

Originally Posted by lganski

Welcome to the forum. You will have to have to have a diagnosis done with the star system. Sounds like something was changed that the system does not like.

Thanks
I asked a friend to check with star but while connecting to ECU it would say "communication error".

Jan 9, 2015 | 01:32 PM

MJ50

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From: MBworld

bone stock E55 AMG

either tune file is bad or connection is loose...
yea, who did the tune??

Jan 9, 2015 | 01:34 PM

ainain

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Joined: Dec 2014

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S600 2007

Quote:

Originally Posted by loungn14

Triple check that you have the electrical connectors on correctly and fully seated until you hear the click

Thanks I checked i thought that cable and pins correspond in a way that they won't accept the wrong plug but someone else said the same thing as you said so i might be wrong

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Jan 9, 2015 | 02:39 PM

DaveW68

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From: Chicago burbs

2015 S550

Again....who was the tuner?

Jan 9, 2015 | 03:25 PM

#10

loungn14

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Joined: Jul 2007

Posts: 5,459

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From: Houston/ Austin /Toronto / UAE / Minneapolis / Orlando /Cincinnati

Eurocharged Performance ML63 and TT lambo

Quote:

Originally Posted by ainain

Thanks I checked i thought that cable and pins correspond in a way that they won't accept the wrong plug but someone else said the same thing as you said so i might be wrong

whenever we have seen this with our tuning, it is due to a connector not being properly seated.

I would remove the ecu and slowly reseat it. Check for bent pins.

You should feel a click when the cable is in tight. Gently pull back as well and make sure it is seated.