EK k kay

I recently had my turbo installed and am using an obd2b to obd1 conversion harness with a chipped p28 and uberdata basemap. With my stock p2p ecu there are no codes thrown. If I connect my p2p ecu it throws code 41 which is the Primary Oxygen Sensor - Heater circuit malfunction. I have tried using differen't o2 sensors and it is still the same. I also cannot get the code to go away by resetting the ecu. Does this sound like a bad chip burn?

Mag00n

"bad chip burn" will almost always throw a solid cell and run in limp mode

wantboost

iTrader: (2)

check that the chip is installed the right way

EK k kay

It doesn't feel like it's running in limp mode because there's no hesitation and it drives fine. I'm sure I have the chip installed the right way. Above the AMTEL writing is the release mechanism.

yee SERIOUS

iTrader: (1)

why don't you try another chip? intec will burn you one for like 10 bucks.

i had a problem with my chipped ecu too. i thought maybe it was a bad basemap too, but it ended up being the ecu being chipped incorrectly with the wrong resistor.

EK k kay

Yeah I'm going to do that. Right now it runs fine aside from some small boost leaks and a surging idle which is probably caused by that cel. Driving slow sucks.

vegaskurt

Are you using a real p28 or pXX converted to a p28? I've had the code 41 for two weeks before I realized the ECU was not converted correctly for a 4-wire o2 sensor.

Take a look: http://forum.pgmfi.org/viewtopic.php?t=10862

EK k kay

It's a real P28. I hope the ecu isn't crap.

vegaskurt

there is a way to fool it using a 100k ohm or 10 ohm resistor, I cant remember which is the correct one. You can always also just disable the heater sensor in uberdata.

EK k kay

I think the chip has a bad burn. I plug my stock ecu back in and no cels come on. When I plug the p28 in and try to get the code, the cel doesn't flash, but just stays on.

093turbo16

iTrader: (2)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EK k kay &raquo;</TD></TR><TR><TD CLASS="quote">I think the chip has a bad burn. I plug my stock ecu back in and no cels come on. When I plug the p28 in and try to get the code, the cel doesn't flash, but just stays on.</TD></TR></TABLE>

Then that is either a bad burn, or bad soldering somewhere or wrong part.

wantboost

iTrader: (2)

solid cel generally means the ecu is bad, check the soldering job.

EK k kay

Let me snap a few pictures and hopefully you guys can help me determine if it's a bad board.

0xenocron

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93turbo16 &raquo;</TD></TR><TR><TD CLASS="quote">

Then that is either a bad burn, or bad soldering somewhere or wrong part.</TD></TR></TABLE>

Not necessarily...I get about 2 people a week that think its the ECU, when they realized they didnt hook up all of their grounds...it worked as soon as they took care of their wiring issues.

An ECU that isnt seeing proper power and ground wont act normal, it goes through a set of "checks" upon start-up, when they arent satisfied, it goes solid and tries its best to run on the backup processor.

093turbo16

iTrader: (2)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by xenocron &raquo;</TD></TR><TR><TD CLASS="quote">

Not necessarily...I get about 2 people a week that think its the ECU, when they realized they didnt hook up all of their grounds...it worked as soon as they took care of their wiring issues.

An ECU that isnt seeing proper power and ground wont act normal, it goes through a set of "checks" upon start-up, when they arent satisfied, it goes solid and tries its best to run on the backup processor.</TD></TR></TABLE>

the stock ecu works just fine.

But I get that too.. or forget that their ECU fuse is out or blown.

EK k kay

0xenocron

Yeah...I've seen it all too.

The best was twice in one week, I had two different people in two different parts of the country who bought the wrong OBD2 conversion harnesses for there car, plug in the conversion harness and the ECU...solid CEL.

Welp...the stock ECU works.

One guy took a picture of how he had part of his harness plugged into the BLANK part of the OBD2 connector, that made it easy to troubleshoot

0xenocron

Pictures are going to be really tough...that looks like a nicely converted P75 to VTEC ECU in a P28 Case...LOL

Back side of the board would be better...

If you want to send it to me to test, I have a known good chip in a known good car I can test it out on. Just pay shipping both ways

Then you can at least elimate a variable...

EK k kay

The thing is the car runs fine aside from the cel that's causing my idle to surge up and down from 1000-1500 rpms. I am trying to get my car tuned this sunday so that's not really an option. I will try to get a new basemap burned onto a different chip and if it turns out to be the ecu I'll just have to find another one locally.

wantboost

iTrader: (2)

sounds like an iacv problem to me.

093turbo16

iTrader: (2)

I don't know if you guys noticed.. but that is not a true P28. That is a P75 board.

EK k kay

But I don't understand why my cel would not show me the code when I jump the connector. Yes the iacv is going bad, but why no cel for it?

EK k kay

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 93turbo16 &raquo;</TD></TR><TR><TD CLASS="quote">I don't know if you guys noticed.. but that is not a true P28. That is a P75 board.</TD></TR></TABLE>

Please don't let this be true. Is that a problem?

093turbo16

iTrader: (2)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EK k kay &raquo;</TD></TR><TR><TD CLASS="quote">But I don't understand why my cel would not show me the code when I jump the connector. Yes the iacv is going bad, but why no cel for it?</TD></TR></TABLE>

I am betting on bad soldering job or bad chip still. The best bet is to take some pics of the back of the board, like chris said. That is where all the "work" is done.

093turbo16

iTrader: (2)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by EK k kay &raquo;</TD></TR><TR><TD CLASS="quote">

Please don't let this be true. Is that a problem?</TD></TR></TABLE>

It is definitley true. That board is a P75.. from an integra. It has the vtec components in it.. but someone switched the label. It shouldn't be a problem if it was done correctly.