420a ecu burned up help!!No Fuel no Spark!

[black9d1tsiawd]

1995 Eclipse RS ecu has a burn in it. I do not know what happened or how but I am not recieving any spark or fuel. I went 2 autozone gave them my vin and they gave me a ecu but it did not work. Where could I could the proper ecu for my 95 eclipse n/t?

Thanks if you have any advice leave it on the boards here.

 

[99dsmeclipse]

1995 Eclipse RS ecu has a burn in it. I do not know what happened or how but I am not recieving any spark or fuel. I went 2 autozone gave them my vin and they gave me a ecu but it did not work. Where could I could the proper ecu for my 95 eclipse n/t?

Thanks if you have any advice leave it on the boards here.

= mine is doing the same thing...no spark no fuel...so its the ecu right

 

[dr1665]

= mine is doing the same thing...no spark no fuel...so its the ecu right

Not necessarily. On the firewall, driver side, there is a pair of relays - one for the fuel pump and another for the ASD ("Auto Shut Down") system - should the ECU detect that its not got the right signals from either the CAS or CMP, it will trip the ASD relay and the car will not firs up.

Get out your multimeter and backprobe your CAS and CMP at both the sensor connector and at the ECU connector. You should see an alternating 5VDC (CMP alternates at half crank speed and is easier to spot) at both locations. If you get that 5VDC switching 0-5-0-5-0 at both these locations while cranking, then you know the sensors are good. If you only get it at the sensor, but not at the ECU, then there is something wrong with the harness between the sensor and the ECU. Consult your Chilton's manual for the proper schematics on these guys. (You can also track down the ASD and fuel relays to test them for functionality at this time.)

If these sensors both check out like this, then you've likely narrowed things down to one of three things, imo:

• ASD/fuel relay
• timing belt alignment
• ECU

You mentioned, in your PM, that you had washed off the engine prior to all this happening. Have you made sure the spark plug wells were bone dry? Water in those tubes will result in shorts that cause heavy misfire (flashing CEL during operation). It could be that your plugs are totally fouled out due to excessive misfiring during testing. Also, don't forget to check your fuses under the hood.

I assume you've got a CEL on. Can you bum a scanner from someone to pull the codes? Since you're a 99, you can't do the keydance to pull them in your driveway, but they're a good start in the right direction. Otherwise, the best way to test the ECU is to find a buddy with a 99 like yours, swap ECUs for a couple minutes and see if the problem goes away. I'd be willing to bet it's not the ECU so much as something else that's got you by the jewels right now.

Good luck to you.