gadelavega
The ECU has become "unresponsive". There is no ethernet signal and no control outputs. This is was happened, just in case the information is of any use:
The engine was running two days ago but needed a replacement alternator. Today a new alternator was fitted. We powered up the system and the fuel pump activated as usual, but the ignition thermal switch went off( now I believe is a signal that all coils where energized together).
We powered off, checked for short circuits and nothing was found.
Kept the ignition circuit disconnected as precaution and powered on again. This time the relays started switching on an off. We checked the battery voltage, main power short circuits, no problem found.
We tried again to check the voltage at the ECM, and again the relays on and off. Voltage was ok.
We disconnected all circuits but a fuel pumps relay and connected the ethernet cable. There was no link over the ethernet cable (no carrier) and the relays were no longer activated.
After that there were no signs of the ECU doing anything at all, even when we tried testing it with only ethernet and power connected.

Any suggestion on what to check or do?

Thanks
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troberts
It is possible that there is a hardware issue with the unit. What do you mean by "thermal switch"?

Are you able to get any serial communication with the ECU? Can you connect using CalTool or DescProW, or flash in the ECU software again?

Cosworth Support
Cosworth Electronics 

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Mats G

Sorry for kidnapping this thread, but I noticed that the thread starter has deleted his user account so he probably won't mind.

I have a similar problem with my SQ6 after a couple of years stand still. The car has been parked in my garage, with the electrical mains switch turned off, and unused for about 4-5 years now. When I tried to start it up again two weeks ago I got no control outputs at all, no spark, no signals to the injectors, not a single sign of any activity at all.

I tried to connect to the ECU using both DESCProW and EcuOffloadTool (through serial communication) but DESCProW reports "This program will only connect to Pectel External ECUs", and OffloadTool can't connect either.

The engine was running fine when I parked the car in my garage, and I'm still using the same old WinXP-laptop as I've always used before.

I'm using a USB->serial converter and if I try to connect to the ECU without turning the ignition on only the "transmit-LED" is blinking, but when I do the same with the ignition turned on I get a blink from the "receive-LED" occasionally, so there's some kind of activity in the ECU. It's the same USB->serial converter that I have always used when flashing the ECU before, I have also tried another converter with the same disapponting result.

I have checked that I have supply voltage to pin 49, and engine ground to pin 23 and 24. I hooked up the oscilloscope and checked that I have some sort of activity on the RS232-pins.

Any ideas what might have happened during the stand still? Is there for example an internal backup battery that might have run empty? Is there any way that I can revive the ECU myself in case of an empty backup battery?

Regards

Mats Gustafsson from Sweden

Pectel-strul.JPG 

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troberts
Hi Mats

There is indeed an internal battery in the SQ6, which has a life span of around 5 years from install.

You'll need to get the ECU returned to Cosworth for a service. Please contact returns@cosworth.com for more information.

Tom

Cosworth Support
Cosworth Electronics 

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Mats G
Hi Tom,

And thanks for the reply!

I'll contact returns@cosworth.com right away.

Regards

Mats
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