ECU question

Ailfenergy · Post by **Ailfenergy** » Sun Mar 23, 2014 8:42 pm

As you might know I had my engine swapped half a year ago. I was running H22A5 with M2X5 box (ATTS), and now I've got H22A with M2B4. I'm still running my old ECU. As far as I understand it is programmed to operate 185hp engine? Would it make any difference if I replace it with ECU from 200hp engine?
@cebul lent me his ECU from 5g H22A. The engine I've got came off the 4g. Is it safe enough to plug it in? I just want to make sure I won't burn the ECU and won't do any harm to the car.

Thanks

Turbomick1985 · Post by **Turbomick1985** » Sun Mar 23, 2014 10:54 pm

I think you need an adapter for 5g to 4g, I think someone else had the same idea I read in another thread but I can't see it
One of the LG Eldars will be along to help you I'm sure

Post by **NafemanNathan** » Sun Mar 23, 2014 11:06 pm

So you're currently running an H22a with a 5th gen (H22a5) OBD2 ecu and saturated (5th gen) injectors?

Yes using a 5th gen H22a's ecu (OBD2 197bhp) will be advantage to you due to its map.

If you used a 4th gen H22a's ecu (OBD1 197bhp) you'd have to swap to peak/hold injectors and add a resistor box.

Ailfenergy · Post by **Ailfenergy** » Mon Mar 24, 2014 12:35 pm

Yes, I'm currently running 4th gen h22a engine with 5th gen ECU for my old h22a5 engine, and I'm pretty sure that I've got standard 5th gen injectors.
Is it straight swap then?

Post by **NafemanNathan** » Mon Mar 24, 2014 1:30 pm

Yes, the important thing if you don't want to swap injectors is that the injectors and ECU remain 5th gen (OBD2).

Then it's all down to the map of the ECU to make the performance changes.

Post by **Lude-dude** » Mon Mar 24, 2014 4:50 pm

also should have 5th gen dizzy, not the 4th?

Ailfenergy · Post by **Ailfenergy** » Mon Mar 24, 2014 6:57 pm

Yes, I have 5th gen dizzy. I'm 100% sure about that, because it stopped working recently, so when I tried to replace it with the dizzy from the 4th gen it didn't fit. 4th gen dizzys have 2 connectors, and the 5th gens only one, right?

Post by **cebul** » Mon Mar 24, 2014 8:22 pm

It is like we spoke mate, somebody swped just bre engine and left all wiring, dizzy and injectors from your previous engine.

Ailfenergy · Post by **Ailfenergy** » Tue Mar 25, 2014 10:22 pm

Right, the new ECU is in.
Couple of questions:

1. What's that on the left side of the picture? Is that ATTS ECU or something?

2. My old ECU is marked up with SH letters? As far as I remember SH is american version of Type-S? What ECU is that?

After installing ECU I haven't noticed that much difference. Probably VTEC kicks in a bit stronger. But I need to test it more.
2 fault codes appeared on the dashboard.

20 - Electrical Load Detector
23 - KS: Knock Sensor

These 2 fault codes never appeared on the old ECU. What's the reason for that?

Post by **NafemanNathan** » Tue Mar 25, 2014 10:35 pm

Not sure about the 20, but your engine doesn't have a knock sensor then and the new ECU is looking for one.

You might be able to get one of @Nucleustylzlude's chips which I imagine will disable a knock sensor, so it shouldn't look for it, therefore hopefully not throw a CEL ???

Also this'll give you some noticeable performance gains, which it sounds like you're after, as going from 185bhp to 197bhp isn't necessarily going to be that noticeable after taking performance losses over time into account.