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?

[samej82]

If you're cranking I guess your starter is okay. i would check the fuel pump circuit, fuel injector circuit, and the starter relay circuit. I think there is a fail safe that can cause this as on of the symptoms.

good luck.