Does a manual conversion require an ECU?

[morgdw]

Hi, I just want to know if I have the egine ECU and changing the auto to a manual, if im jumping the harness, do I still need to have a trans ECU?
Thanks

[Horny_Devil]

nope u just need the main ecu for a manual

[bmgjet]

nope dont need the trans controller. If you keep the main auto ecu it will throw error 19, You can fix this be moving a risistor inside it. Or the better option of using the manual ecu wich has better tuneing.

[morgdw]

Can you explain more on moving this resistor inside the ecu? thanks

[bmgjet]

what ecu do u have? obd0 or obd1

With obd0 you desolder R68 then resolder it to R67. Both of these are to the left of the 28pin chip.

Its pritty easy to do and only takes like 3 mins.
If your not too good with soldering any electrician should be able to do it for really cheap.


OBD1 is ever easier, Remove resister on RP17 just use some wire cutters then solder a price of wire on RP18. Theses are below the 28pin chip.

[Coupe-R]

OBD1 is ever easier, Remove resister on RP17 just use some wire cutters then solder a price of wire on RP18. Theses are below the 28pin chip.

on JDM OBD1 small box ECU you will not be able to use a wire cutter. They are small surface mount components.

Don't use wire cutters at all on the ECU's. Just use desolder braid or solder sucker.

P.S to give you an example of Auto vs manual ECU tuning.

OBD1 P30 MANUAL=5800vtec 8300revlimit
OBD1 P30 AUTO =5800vtec 7800revlimit (identical ignition timing as manual with SLIGHTLY different fueling)

So really they are NOT detuned at all (power is all in timing anyways, the fueling is so similar)
just lower revimit thats all

[mr_tec]

or pay coupe-r monies and he does it

[Coupe-R]

not much monies tho ("you can wires the monies directly")

[morgdw]

Ok then I have a OBDII as its a 1998 F20b SiR ecu. So what can about jmping the harness and changing the resistor then. Also can I retune my ecu to increase the redline? to make it similar as the manual ecu? Thanks

[Coupe-R]

Sorry I don't chip and tune OBDII and I do not know how to convert them to manual either.

[morgdw]

Do you know who does?

[bmgjet]

get a harness to convert to obd1, No one really does obd2 because its too hard and no enough is knowen about them.

Obd2a To Obd1 Wiring Harness Adapters 4 Sale

[morgdw]

ok i have jdm 94 cd accord with a us wagon f22b sohc vtec. Im using the US f22b ecu and auto ecu, this its obdI, so can i use the US engine ecu to run the F20b SiR engine?

[bmgjet]

You can use any ecu with any engine, You just have to make sure the sensors are right and that its running a map thats right for ur engine.

Both those problems can also be fixed by chipping your ecu and reprogramming it.

Coupe-R should be able to chip a ecu with the right base map for your engine.

[FLYRYD]

ive converted my auto ecu to manual, not too hard, just need to know what to look for. you only want to do this if you are running a automatic engine with manual gearbox.

[Coupe-R]

you want to convert if running auto ecu with manual trans,'
Otherwise you will get a solid CEL for code 19 auto trans lockup soleniod.

[morgdw]

How did you convert you auto ecu? because youve done what i want to do. Cheers

[Coupe-R]

I only know how to convert OBD0 and OBD1 to manual to remove the code19

not sure what to do with OBDII

[Horny_Devil]

prelude ecu's dont work either as they are different to the good OBD1 ones