madjap

I just picked up a 95 DX hatch (automagic) to use as a DD. It's surprisingly in decent shape, and runs pretty well with its stock D15B7. It does get somewhat shitty gas milage tho...but that could be an old O2 / cat thing. I'm gonna replace those and see if the MPG increases.

However, while troubleshooting my AC clutch not kicking in, I found that it has a manual ECU (P06-A02), where it should have an auto ECU (P06-A52).

Would it be okay to leave it? I have no cel, and like stated, it seems to run fine.

Any insight would be much appreciated.



TIA

JAP

Former User

-Do an ignition system tune up.

-I would think that the engine rpm where the auto transmission chooses to change gear is non-optimal without an auto ECU. This may also contribute to the low gas mileage.

94EG8

Define shitty mileage. When I swapped the automatic out of my sedan for a DX 5 speed I picked up about 100km/per tank. I never actually checked actually mileage till after I swapped the tranny and at that point I as getting around 40US MPG. If you're used to driving 5 speed civics be prepared to be underwhelmed as far as fuel mileage goes.

I'd definitely replace it, automatic P06s aren't worth much.

tlarimer

iTrader: (3)

Check and see if i's just the ECU case, I've seen some that had guts switched between cases for some unknown reason. There should also be a sticker identifying the board on the grey ecu connector, inside the case. Ideally the board sticker and ecu case sticker would match, but this is not alsways the case, I found out the hard way.

madjap

Already done.

I did not realize the auto tranny was controlled by the ECU.....I thought the tranny had it's own mechanism.

I'm getting 24-25 MPG, driving super conservative.

Former User

The auto transmission has it's own mechanism but the process is optimized by the ECU:



Also, what did your tune up consist of?

jayWknight

iTrader: (3)

If you are going to sell the manual ecu, I will take it off your hands.

madjap

cap, rotor, wires, ngk plugs, fuel, air and oil filter with oil change, adjusted vlave lash, checked timing.


PM me. I am going to go get an auto ECU tomorrow, so the manual ecu will be available.

Former User

Any CEL codes?

madjap

As stated in the first post, no CEL.

I just swapped the ECU for an auto one (P06-A52), and it does seem to run smoother. I also now have a working A/C, and the shifter interlock works.

Yay.



JAP

Former User

It will be interesting to see whether your gas mileage also improves.