Hi to all BRAVA/BRAVO owners,

This is my first post in this interesting forum.

If anyone knows, I need to know what voltage the ECU sends to the ignition coils while starting the car.

I will explain what lead to this question:

I have a problem with my BRAVA (1996 1.6 SX manual gear box)- It is not starting, Coils and Crankshaft sensor are O.K.

I understand in electronic, so I opened my BRAVE ECU and found the problem- there are two devices that swithing the voltage going to the ignition coils- one of them is damaged and the resistor connected to it is damaged too.

Unfotuneatly, I can't find the exact device (as far as I can see it has to be an IGBT device), since the american manufucture Harris, sold to intersil and to Fairchild semiconductor in 2001, so no data avalible for this device.

If someone can help me with info of the output voltage to the ignition coils (maybe 300-400V??) I can find a replacemant to the original device.

Thanks,

Avi.

I have a spare Brava 1.6 ECU sitting here in excellent condition may be usefull to you? :yum: :idea:

Wow, someone is rolling up their sleeves!.
The batt+ voltage is supplied to the coil hot side, the coil cold side is connected to the o/p transistor. The transistor switches on and effectively earths the coil, Electo-magnetic field builds up around coil core and collapses when transistor turns off causing flyback pulse to energise spark plug.
So the answer to the question is batt+ voltage, however there will be a negative going flyback pulse which would need to be dumped either in the coil internals or transistor internal or on the circuit board.(probably by diode).
Good idea to rob the parts from an identical old ECU, or re-code another ECU.

Thanks for you'r help, the new part is the IGBT device MGP20N40CL

I took this from other Marea 97' and fixed the ECU.

Now in my way to my BRAVA, wish me lack!

Avi