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99_Viper
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Last seen: 1 month 2 weeks ago
Joined: 04/15/2015 - 12:18
Can't connect at all

Hi:

I'm using Windows 7 and a serial to OBDII adapter to try and connect to my v1. All I get is it saying "ECU is Offline". I have the key on 'Run', not accessory. I've tried turning the car first then connecting, connecting then turing on, etc. None of this seems to help. I have the connection set to COM1 which is what my Device Manager says I using.

When I first try to connect after opening AEM_Pro, it does say 'frame error' and/or 'parity error' then it says "ECU is Offline" over and over.

I get the same behavior if the serial cord is disconnected, so somewhere there is a big disconnect.

Any advice on what to try next? I thought maybe getting a USB to OBDII connector, although either should work. I also thought about getting an older version of Windows, but shouldn't AEM_Pro work with Windows 7?

Thanks

AEM_NS
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Last seen: 1 year 4 months ago
Joined: 06/06/2014 - 09:31
Support for the Series 1

Support for the Series 1 ended at the beginning of the year so we're kind of limited on what we can do to assist.  One thing I want to point out though is that a USB to OBD2 connection absolutely will not work.  The Series 1 never had USB comms.  When you plug into the OBD2 port, you're not communicating with the ECU via J1939.  It's just the regular serial comms but being sent through the OBD2 port because it's there and convenient.  Frame or parity errors may be indicative of comms configuration problems.  I'm guessing that you've not comm'd up with the Series 1 using this laptop before.  If you had, then you'd know that it at least used to work.  Having never comm'd up to the unit before with this laptop means that the laptop is a variable.  

99_Viper
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Last seen: 1 month 2 weeks ago
Joined: 04/15/2015 - 12:18
I know support has ended, I

I know support has ended, I was hoping an informed user would help out. So thank you for responding!

True, I've never used this laptop to connect, or this serial to OBDII cable, or connected to this ECU. So all are variables, unfortunately.

How about trying an older version of Windows?

AEM_NS
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Last seen: 1 year 4 months ago
Joined: 06/06/2014 - 09:31
Probably not an OS problem.

Probably not an OS problem.  One other important thing is that the AEM Viper comms cable was not a regular serial to OBD2 cable.  It's actually a specific cable that we made and a generic serial OBD2 cable won't work.  If you don't have the actual AEM cable then you probably won't be able to comm up to the unit.  We haven't made the cable in a long time but I'll see if I can dig up to part number for you.  

atroph
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Last seen: 4 years 4 months ago
Joined: 04/14/2015 - 18:29
- You will need to make one

- You will need to make one if AEM_NS can't find one for you. If you can't make this cable then it may be time to seek a tuner. FWIW I hard-wired mine to the back of the OBD connector and ran the cable to the passenger side of the vehicle so that I can unroll it at a moments notice and get to work. If this doesn't work then you may try another USB to serial adapter. Some have been known to be flaky at times.

- I get the frame error, parity error, and break at times and usually I reboot my laptop or switch USB ports and most of the time it fixes it. If not then I turn the car off for about 5 minutes and give it a rest and it goes back to operating normally. Be sure that your ground is good between the EMS and the serial cable.

- Also if you are having problems with AEM Pro connecting try AEM Tuner. I have never had an issue with Tuner connecting whereas Pro can give the errors above. In my experience Pro will error out 1 out of 50 times that I connect to the EMS. Tuner always syncs up even when Pro is giving me a fit.

- Final thought, if you have telemetry mode enabled it has been my experience that Pro will not connect once telemetry data is being passed. Telemetry data starts flowing after about 30 seconds after the EMS is turned on. Tuner on the other hand will interrupt telemetry data and connect to the EMS IIRC.

Saved this from the old forums:

DB9 Female

PurposeOBDII ConnectorEMS Cable ColorCar OBD Wire ColorDB9 Color
Pin 2RxPin 7WhitePinkBrown
Pin 3TxPin 6 and 12RedGreenRed
Pin 5GndPin 4BlackBlack/PinkYellow


The cable is universal between the Viper and the SRT-4 hence the extra Red Transmit at Pin #6

 

99_Viper
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Last seen: 1 month 2 weeks ago
Joined: 04/15/2015 - 12:18
Thanks, that's really helpful

Thanks, that's really helpful as a backup.

mroy0404
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Last seen: 5 months 1 week ago
Joined: 06/13/2019 - 20:04
Can someone send me more

Can someone send me more detail on the specific pinout for the serial to obd2 cable for the AEM EMS series 1. I have the series 1 installed in a 1996 viper gts that I just can not get connected too.
I've tried many different cable's using aemtuner and aempro with no results.
My email address is mroy7@cogeco.ca
Thanks for any help guys.