I have a 2004 Ralliart. I am driving myself crazy trying to figure this one out. One day I was warming up my car, hopped in to go to work, and it died. Hasn't started since. Cranks like a champ. Even replaced the battery because it was old. Fuel pump operates with the cheap Bluetooth OBD reader and App I purchased.
So far I suspect something is wrong with the TPS (sub). It just reads noise between about 3.6-5.0V at zero throttle. It is supposed to be between 2.2 and 2.6V at zero throttle.
From what I've read, this should allow decreased performance, not full disabled.
Would this cause no spark?

 

I forgot to add: All fuses are good, and as far as I can tell the relays are good as well.

 

have you checked the timing belt? also can you confirm ECU is getting power?

 

Replaced the timing belts last year.

Below is a screenshot of the OBD data.

Mitsubishi MUT :
Green = Throttle Position %
Yellow = Throttle Position Method 2 %
Light Blue = TPS Main mV
Dark Blue = TPS Sub mV

OBD:
Pink = throttle position

 

Messed around with the car today. Supplied 5V directly to TPS Sub and got the exact response I was looking for, 2.8V-4.6V by pushing the butterfly valve closed and then holding it all the way open, measuring with a DMM right from the sensor. I then unplugged my accelerator position sensor and reconnected the TPS connector, turned the ignition to the ON position and read the values from the OBD reader... TPS still reads noise and the throttle position methods 1&2 have what looks like half range to me...

Does this mean the ECU is to blame?

 

Bump

 

After letting the car sit and ignoring it for a while, I removed the timing cover and found the 1-year-old timing belt had snapped. I had assumed it was fine because it was not old, but I was very wrong. Now to investigate the damage... any tips?

 

since the car was at idle, you maybe lucky that the pistons didn’t damage the valves. My belt went around 3500rpms and the pistons bent the valves. Pull your valve cover and check the rocker arms if a bunch of them are loose that means the valves are bent and you need to pull the head and either rebuild it or buy a rebuilt one and send your head in as a core. If the rocker arms aren’t loose you maybe be able to just replace the timing belt and get her back on the road.