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ECU trouble / not working

MrHabaki
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MrHabaki Member

MrHabaki

Posted
Posted

Hello,

 

I am owner of a 2004 Cayenne 3.2 V6i. Suddenly my ECU stopped working. I cannot start the engine anymore, have no check engine light (not even when I turn on ignition) and the coolant fan will start working. I tried an ECU from an other Cayenne and with that one I can start the car, but it will immediately stop working due to anti-theft regulation.

 

My questions:

1st) can I (or Porsche) program my cayenne so that the 2nd (used) ECU works with my Cayenne, or do I need to buy a new one?

2nd) is there a fuse or part that I should check first on the defective ECU?

 

Any help or hint is welcome!

 

Best regards,

 

Chris

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JFP in PA Member

JFP in PA

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3 hours ago, MrHabaki said:

Hello,

 

I am owner of a 2004 Cayenne 3.2 V6i. Suddenly my ECU stopped working. I cannot start the engine anymore, have no check engine light (not even when I turn on ignition) and the coolant fan will start working. I tried an ECU from an other Cayenne and with that one I can start the car, but it will immediately stop working due to anti-theft regulation.

 

My questions:

1st) can I (or Porsche) program my cayenne so that the 2nd (used) ECU works with my Cayenne, or do I need to buy a new one?

2nd) is there a fuse or part that I should check first on the defective ECU?

 

Any help or hint is welcome!

 

Best regards,

 

Chris

 

Welcome to RennTech :welcomeani:

 

The DME and the CLU/immobilizer have to both be coded with a PIWIS in order to work together.  This is why swapping DME's does not work.  As you are going to have to tow the vehicle to a PIWIS equipped shop in any case, they should also be able to scan your original DME to find out what is up with it.  It may be a simple fix to get your original DME back online.

 

Good luck, and let us know what they find.

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MrHabaki Member

MrHabaki

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Thank you for your answer! That means the Porsche dealer with PIWIS should be able to to the coding. As they refused to do so...they wanted to sell me a new ECU.

 

I will keep you informed!

 

Best regards,

 

Chris

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