just bought a 92 cx hatch. its throwing code 16(injectors). it has a p75-a01

ECU. it has a d15b7 engine. i dont notice any mechanical problems other than when i

drove it 60 miles and got home, it didnt want to start for a couple of minutes. it didnt

overheat, just started right up after a couple of minutes. maybe if i put the stock p28

ecu in it will remedy the CEL? help me fix this thing so i can smog and register it please!

 

Stock ecu for that engine is a p06, I believe.

 

you might be right, although im reading that the p06 is out of the dx. i have the CX, maybe a p05 ecu?

 

Dx engine is d15b7 though, stock cx is d15b8, which uses the p05.

EDIT: p75 is a b18 ecu, will run pig rich on your car.

 

cool. so it seems as though the previous owner is running a dx engine with a ls ecu. i just need to get the dx p06 ecu and hopefully i can fix the problem. ill post when i install the ecu. it should be just plug and play right?

 

Yep, plug and play.

 

If you still get the code 16 after the ECU swap, resolder or replace the main relay. That code will set whenever there is a break in the electrical path for the injectors to the ECU. (main relay, injector resisters if applicable, injector clips, injector coils, and all the wiring between all that stuff)

 

cool, i should be getting the "new" ecu this evening. we will see what happens.

 

ok p06 installed. now im throwing code 41(heated oxygen sensor) . help!

 

o2 sensor is bad or you're using a 1 wire by mistake.

 

yeah, i have the cx mani with the cx o2. going to hit the junk yard and find a 4 wire sensor.....

 

Your signature changes with ecu issues.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SVOboy &raquo;</TD></TR><TR><TD CLASS="quote">Your signature changes with ecu issues.</TD></TR></TABLE>

i phear electrical. once i master that, there is no stopin me. but thanks for noticing lol.

i hope i can wire the new o2 sensor up to my harness

 

ok, at this point, i am thinking i need to wire up the new o2 sensor which a 4 wire

DX sensor. in the picture is a CX manifold with the one wire cx o2 sensor. who ever

had the car prior to me did some type of custom wiring and it appears that he messed

up the harness. is it possible to wire the sensor directly to the ECU? what should i do

at this point?

 

what are my options? do i wire up to the ecu? should i just buy a new engine harness? what engine harness are compatible???

 

Its spelled "wiring" not "wire ing"

 

This may or may not help, but try matching the ECU with the injectors, just to be sure.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by LsVtec92Hatch &raquo;</TD></TR><TR><TD CLASS="quote">Its spelled "wiring" not "wire ing"</TD></TR></TABLE>

your posts are invaluable to this thread. thank you so very much for contributing your insight into the relevance of my posts.

 

For gods sake man, do a continuity test from each injector pinout on the ECU to the actual injector, that will pinpoint your problem.

 

my problem is not the injectors now. that code was fixed when i replaced the p75 with the p06. now im throwing a code 41. i bought a new o2 sensor, the 4 wire one. im going to have to do some custom wiring.

 

Ok.

Sounds like the previous owner swapped in a DX engine (D15B7) into a CX body but didn't completely finish the job. CX motors are D15B8.

What gets me is that the P75/LS ecu should've been throwing a code 41 as well, because that ecu looks for a 4-wire 02 too. Obviously, the original reason why you had a code 16 is because the P75/LS ecu was looking for higher CC injectors and the CX injectors weren't pleasing this ecu's programming requirements.

Now that you've picked up a DX/P06 ecu, yer on the right track and your options are:
1) you either need to add 3 more wires to the 02 sensor to make it a 4-wire 02 which in turn will please the P06/DX ecu.

..or..

2) Get yourself a 92-95 DX or Si/EX engine wire harness which will have the 4-wire 02 wiring already done from the factory. Why Si/EX? because later on if you decide to throw a VTEC head on your DX block or go DOHC VTEC you won't need to wire VTEC in at all because its already in the harness! and as an added boner, you own a 92 civic which is the only year honda prewired NON-vtec models with VTEC wiring from the ecu plugs out the passenger side shock tower making wiring for VTEC 100% plug n play when going this route.

Now you mentioned running a P28 ecu, but you don't wanna do that because you'll not only throw the same code 41 but also code 21 & 22 which are the VTEC pressure switch & the VTEC solenoid, which your motor DOES NOT have (CX/DX motors are both non-vtec engines).


The wiring you've shown in your image looks normal. It just looks like the sheath around the 02 wiring was removed or fell off or something. The wiring that your saying "WTF" to, is probably leading to the ECT sensor.

hth.




Modified by Katman at 11:24 AM 1/7/2006

 

good info man, thanks. i was about to get a dx harness at pick-a-part today, but did not bring the right tools. but im content now becuase i didnt think about wiring vtec later. i will update this once i get a new harness since i predict a few bumps along the way. thanks again

btw, when there is multiple cell codes, are they displayed one after another? or are they displayed for example "16, 16, 16" then "41, 41, 41" ? i just assumed that the codes would be shown one right after another, so i only waited for it to repeat twice. maybe that can explain why the ls ecu was only throwing a 16, and not a 41 as well. i might have not waited long enough to see it? i dunno, correct me if im wrong.

 

It would display 16, then 41 immediately after, following by a long pause indicating there are no more codes, then start with 16 again.

 

then the ls ecu really wasnt giving a 41. that is kinda weird...

 

found a dx harness in the yard. everything was going good untill i was about 3/4 of the

way done and found that there was no plug to be found, to put in the highlighted area

of the picture. i went ahead and finished it up and starte the car. the car idles good,

except when i gas it, the car bogs and will not rev. it is now throwing a code 3. this

is the map sensor code. somebody must have taken off the map sensor plug and i

didnt notice? having fun tho, really learning alot!