PLEASE HELP!!! Anyone that can.

Car was just recently tuned on a Mustang Dyno. I noticed that while on the dyno, it was reading 0 mph during the pulls. I didn't take that to account since it's on the dyno and it's being tuned. I've never been on a dyno and my car was being tuned for the first time.

After the tune, they took the car off the dyno and I left their shop. While on the highway, I noticed that I'm diving at 0 mph and my EPS light is on. I called the shop and turned back around. The tuner plugged his computer and checked everything. He said that everything looks fine here. He said it might be the speedometer sensor near the tranny. We got the car on the lift and checked all the sensors.

Mechanic said that it may have burned out during the dyno and might need to be replaced. He plugged in his OBD diagnostic scanner and recalibrated the speedometer. Still nothing changed after he turned on the car.

He decided to plug the stock ECU just to see if it will make a difference and speedometer and power steering work.

He unplugged my stock ECU and replugged my AEM EMS.

Mechanic said that they will send my MAP to AEM and have AEM check to see if the tuner missed something.

PLEASE SHIME IN SOME INPUT IF YOU GUYS ARE FAMILIAR WITH THIS.

THANK YOU!!!

 

Nice car by the way as far as the tune I'm sure someone on here will be able to help you out

 

Thanks man.

Bump.

Still no speedometer.

 

What model AEM do you have? Is it plug and play? Is there a jumper or extension harness?

 

I have the AEM EMS Series 2 6052. It's plug and play. I have checked all sensors and wiring, reinstalled stock ECU and speedometer and powering steering work. Maybe something in the AEM EMS. Waiting for tuner to fix but seeing if anyone know the technical fix before I see the tuner again.

 

You don't happen to have the modifry yellowjacket add-on do you?

 

No. I don't have that. Everything under my dash by the fuse box is factory except for the AEM EMS.

 

The yellow jacket is a calibrator. I don't think it has anything to do with me reading 0mph. I've heard that is a fix but I need to know its a known fact before I purchase it.

What if I plug connector "a" to the stock ecu and leave connector "b" and "c" to the aem. It looks like connector "a" is not modified to the tune.

 

Perhaps try to diff the tuner map with the base map provided by AEM and see if there is anything obvious that is missing that might relate to these problems?

 

I currently don't have hands on a laptop. It's worth a shot. I'll let the tuner know.