Connectivity problems between the Pc and EMS-4 | AEM
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Carlos_BG
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Last seen: 5 years 8 months ago
Joined: 06/19/2014 - 08:52
Connectivity problems between the Pc and EMS-4

Hello,

I'm an Spanish Engineering student using an EMS-4 in my final degree project. I use it on an engine in a test bench and I'm having connection problems between the PC ante the EMS.

When the engine is running and the EMS is connected to the PC tunning it up whith AEM Tuner software sometimes it suddenly loose the connection and then the computer don't recognise the EMS trougth the USB port. The last time it happens it had been working properly for about 20 minutes, and then it loose the connection and there was no way to connect it and made it works again.

I've test all the connections on the EMS wiring harness and they are OK. I'm usingand an USB extension cable with amplifier to connect it from the bench to the room next.

Any idea to solve the problem?

Thanks a lot

a2nsky
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Last seen: 6 years 1 month ago
Joined: 06/21/2014 - 00:19
Maybe a too long USB cable..

Maybe a too long USB cable..

they advise me to put a password on EMS

But do not cut ignition on EMS when you stop engine, cut only fuel because you lose all and need to wait for 15min in order to have the EMS recognized again

LDSNOMAD
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Last seen: 2 years 1 month ago
Joined: 05/29/2014 - 21:50
If your running COP's do not

If your running COP's do not ground them with EMS. Them have to have there own ground to the block or head. I have the same problem were my laptop would lose it connection with the EMS4.

Lozono

AEM_NS
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Last seen: 14 hours 49 min ago
Joined: 06/06/2014 - 09:31
The above replies are all

The above replies are all good suggestions.  USB comms are fairly sensitive to noise - especially ignition noise.  Be sure that the ignition system is NOT grounded to the same ground point as the ECU.  Make sure that the ignition system is physically isolated away from the ECU (ie don't mount your CDI box next to the EMS).  Longer cables do have the possibility of being more susceptible to picking up noise.  Be sure to use very high quality USB cables and even try to use cables that have ferrite noise suppressors.  

If after losing comms you get a 'USB device not recognized' message it's because the ECU is failing to restart due to a known firmware bug problem.  The solution for this is to assign a password to the ECU.  

Just for good measure, it's best to use AEMTuner 2.98 when using the EMS-4.    

Carlos_BG
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Last seen: 5 years 8 months ago
Joined: 06/19/2014 - 08:52
After checking all your

After checking all your suggestons it continue working bad, so I dismantled the main conector of the AEM and I checked that USB Data cable was a little bared near to the pin, soy I change this connection and also the tab where I connect the grounds inside a box in the bench was a little bit lose.

After repairing both things the connection doesn't failed again.

Thanks for answering