HELP 06 eclipse died on road.

O.K. I have an 06 Eclipse with the V6. I died on the road yesterday. I got it home and started looking at it this morning. Hooked up my scan tool (which I have used on this vehicle before) it says it cannot communicate with the vehicle. I pulled a coil(coil on plug) hooked up my spark checker and did not see a spark when cranking the engine. I suspect a bad ecu. I cannot find any information on further checks to confirm a bad ecu. Also it sounds like a factory type scan tools is required to replace one. Any advise or information would be helpful TIA.

I'd start with the basics, here's one of our how-tos:

https://grassrootsmotorsports.com/articles/troubleshooting-101-basic-steps-when-your-car-wont/

I'd suggest checking for spark by spraying some carb cleaner in. From there, you can move on to diagnose fuel or timing.

Battery voltage and amperage? Also check your battery cables and where they go to. I've had similar issues with a corroded ground.

The car cranks easily I suspect plenty of battery voltage and good grounds. As stated above using a home made spark checker and there is no spark. 

I helped with an Evo X that had similar symptoms but wouldn't crank. No ecu communication and the fan was running with key on. Ecu was fried and had to go to the dealer to get a new one flashed.

Sounds like either a bad ECU, or wiring issue. Have you checked fuses?

not yet. there is power to the data connector. 

I would guess bad ecu if the code reader failed to connect, or something bad in the harness along the way. You have critters?

No critters no sign of defective wiring.

Does that car use a crank position sensor?

Ecu is about the 63rd thing that makes a car not run...

Crank Position Sensor would be my first guess.

Unfortunately the way to check for a bad ECU is generally to swap in a known good one. Check fuses, fusible links and grounds. I think the tipoff is that your scan tool won't connect, but id exhaust the obvious before getting a replacement.

Computer not getting power will cause no communication, too.

O.K. to close this out, I started with checking fuses. Found the #9 fuse under the hood to be bad. replaced fuse and it blew on trying to restart. A google search brought up that the O2 sensors are on that fuse. I disconnected the sensors (all 4) and replaced the fuse again and it started right up. I am in the process of replacing all 4 sensors as this thing has over 200,000 mi I figured it would be best. Side note the crank and cam position sensors are also on this fuse.

zordak said:

O.K. to close this out, I started with checking fuses. Found the #9 fuse under the hood to be bad. replaced fuse and it blew on trying to restart. A google search brought up that the O2 sensors are on that fuse. I disconnected the sensors (all 4) and replaced the fuse again and it started right up. I am in the process of replacing all 4 sensors as this thing has over 200,000 mi I figured it would be best. Side note the crank and cam position sensors are also on this fuse.

Glad you figured it out, and really glad it wasn't the ECU itself!  Thanks for updating the thread for those of us following along at home.