AT Check light flashing

[moog]

Background on the car.

03 G35 coupe88,xxx miles5ATVortech SCTurboXS UTECsupporting mods (walbro, 440s, exhaust, etc...)Car has been street tuned, still ran a bit rich under medium throttle

Took it to get dyno tuned today. The car was strapped down and a quick run was done w/o any measurements just to make sure the straps were secure. Car was shut down to cool down a bit. Car then wouldn't start. It cranks over real strong, but it doesn't fire up.

The cars "AT Check" light flashes 16 times. According to tech specs its something about the speed sensor. We tried to hook up an OBD reader and we're getting a read error. When the key is in the "on" position, the fans automatically kick on and stay on.

I spoke w/ a few tuners, including Mark over at SGP who was frickin awesome. He said there was a bus read error or something to that effect. Something is throwing off the electrical communication within the system. We checked all fuses and everything seems to be just fine. No blown fuses. We reset the ECU by the pedal method, disconnecting the battery, and attempting to clear w/ the OBD diagnostic tool. The "AT Check" light is still blinking. Tomorrow we will try to get a hold of a Consult to read the code.

Does anybody have ANY experience in something like this?

[C-Kwik]

I haven't heard anything like this before. But it is quote hard to diagnose over a forum. Let us know what comes up with the consult. Hopefully, we can point you in the right direction. It may be a complicated issue though.

[szh]

Yes, I think that using a Consult will be the obvious next step.

But, in the meantime you could also try disconnecting and reconnecting the ECU and the TCU completely (reset the TCU too ... if there is a sequence for that in the Service Manual) and see if that clears things up.

BTW, the G35 Service Manuals are available on-line here at NICO ...

Z