General My Evo 3 engine crank but no power to spark plug

[Yusaiful]

Hi everybody, I'm new here. I'm from Malaysia.
Need advice from everybody here, My Evo 3 just change from factory ECU to standalone maxxecu mini. The problem arise is when crank the engine no power to spark plug cause engine not start.

For engine wiring harness use harness from maxxecu mini. From factory harness diagram I saw MFI fuel relay will ignite fuel pump and ignition the ignition coil. For maxxecu harness the ignition power taken directly from battery only 1 pin out from maxxecu mini to fuel pump relay.

Is it the right way for ECU to control MPI and ignition?

 

[steve]

I can't speak about how the Lancer Evo 3 is wired but a DSM uses the MPI relay to control power to the various sensors and to the fuel pump using two low side output signals from the ECU.

The MaxxMini ECU doesn't look like it has a default to do either. I'm thinking you need to use the ignition switch to activate the ECU +12v power and program the Mini to use one of it's GP Outputs to activate the Fuel Pump. You can use a factory MPI relay or connect two standard Bosch 12v relays. The ECU power would be high side switched (The IG switch providing 12v and the relay coil grounded) and the FP relay low side switched (getting fused +12v and the relay coil pulled low by the Mini GP output).

Don't forget to somehow program the Mini to turn off the Fuel Pump if the engine stops turning, you don't want to go up in flames.

 

[Yusaiful]

Thanks you Steve for your good information,will do as your info.