The reason im asking, is i seem to have run into a problem. According to my ECU, im throwing a code 9. From all the books I've been reading, a code 9 on an OBD1 GSR, vs an OBDII Prelude are different. Code 9 on the GSR is the Crank position sensor. Code 9 on the lude is the Cylinder position sensor.

At this point im completely lost. We tried plugging the car into the Snap-On diagnostic computer, and we couldn't get the two to communicate. I put the stock ECU's back in, and it didnt throw anything related to a code 9. Anyone know if i got a bad ECU? or if a p72 just doesn't work on a 5th gen SH? any help would be appreciated.

 

the p72 will work....you sound like you have a problem inside the ecu somewhere.....you could try to put it in another car and start it up to see if it is in fact the ecu.....

 

hmm i had this problem, but i used a p28. my cam timing was 1 tooth off, so i changed my timing belt and fix the timing and the cel went away. but if your cam timing is TDC its the ecu or conversion harness. at first i thought it was the dizzy like everyone else said

 

my p72 is working fine

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Deckedlude &raquo;</TD></TR><TR><TD CLASS="quote">my p72 is working fine </TD></TR></TABLE>

You are running a p74/75 you idiot.

 

i checked the sensors. i pulled the dizzy cap to look for ignitor dust. im just running out of ideas. stock ECU with a o2 sim and VAFC here i come.

 

btw.....98typesh im glad you kept your car, you do still have that beautiful head on the car right??

anyway.....did you use a conversion harness, b/c if so, depending on where you bought it from, your problem could be there......i bought a cheap conversion harness and it was a peice of crap, didnt work at all, so what brand is yours?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">btw.....98typesh im glad you kept your car, you do still have that beautiful head on the car right??

anyway.....did you use a conversion harness, b/c if so, depending on where you bought it from, your problem could be there......i bought a cheap conversion harness and it was a peice of crap, didnt work at all, so what brand is yours?</TD></TR></TABLE>

how could he run an obd1 ecu without a conversion harness on an obd2b wire hanress....? but if u read above ive already mention it might be a faulty conversion hanress

 

sry for explaining my conclusions to those who may not be infer what im talking about, i sincerely apologize.....

 

Its a boomslang conversion harness. I tried swapping in a p28 with hondata and a completly different harness, and i still ****** threw the code 9. Ive OHM tested the CYP sensor and most the other sensors just for *****, and everything came back normal. I do have a slight problem getting a reading at the ECU connector, but ****. I need to find someone that is local to me that will stop jerking me off, and help me. I need to try a diff dizzy, running direct wires from the CYP to the ECU.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mgags7 &raquo;</TD></TR><TR><TD CLASS="quote">sry for explaining my conclusions to those who may not be infer what im talking about, i sincerely apologize.....</TD></TR></TABLE>

ugh, your cool? i say that to say, why say the same **** that i already posted? its just wasting space and a waste of time to read it twice

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98TypeSH &raquo;</TD></TR><TR><TD CLASS="quote">Its a boomslang conversion harness. I tried swapping in a p28 with hondata and a completly different harness, and i still ****** threw the code 9. Ive OHM tested the CYP sensor and most the other sensors just for *****, and everything came back normal. I do have a slight problem getting a reading at the ECU connector, but ****. I need to find someone that is local to me that will stop jerking me off, and help me. I need to try a diff dizzy, running direct wires from the CYP to the ECU.</TD></TR></TABLE>

i have the same conversion harness too. but yeah since its not your cam timing, dizzy would be the next thing id check good luck

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by PrecisionH23a &raquo;</TD></TR><TR><TD CLASS="quote">

You are running a p74/75 you idiot.</TD></TR></TABLE>

Doh!

 

did you ever figure this out. i'm interested to know because i was talking with a friend of mine yesterday and we were dicussing this very same issue.
i think it is the fact that the CYP is in the distributor on the P72 and on the crank for the P13/P5P/P5M. he said you could jump the wires from the crank mounted CYP (OBD II) to the distributor (via the harness), but from my own personal past experience, the signal the ECU is getting is not the same type of signal it would get from the distributor mounted sensor. so there are still going to be problems.

short version: What happened, and how did you fix it?

 

i swapped my dizzy housing and it went away. I still dont know wtf is going on with the old one. Maybe somewhere in the dizzy there is a short or cut in the line but the CYP still tested perfect on the ohm test. o well. its gone now and im a happy camper.

 

so you left all the OBDII stuff, and just added an OBDI distributor?

 

no, its still an OBD2 dizzy with all OBD 2 stuff.

 

so you are running the full JDM motor, and you've since switched to an OBDII diz?

sorry, just want to get everthing straight.

 

lol man you are confused.

5th gen Type SH with jun head, prospeed header, Hondata, everything is OBD2 minus the p72 ECU. No JDM anything cept foglights.

 

i was confused. thanks. i had it in my head you did a swap too.

so you're all USDM SH Prelude except for the P72, the harness, and the Hondata?

 

besides the jun head yes. stock USDM compression etc etc

 

do your issue was just with your distributor?

just faulty? i assume you replaced it with just a new SH-spec unit?

 

i just replaced the dizzy housing with another OBD2 h22 dizzy. lol SH doesnt have a different spec distrib, its all the same .

 

I'm not fully understanding but you are running on an OBDII dizzy, correct? the CPS on the OBDII is located down in the timing gears/pulley area and for some reason reads slightly differently than the CPS located in the dizzy on the OBDI dizzys, That should be the problem if i am understanding your situation correctly.

 

its the CYP sensor. Supposidly its in a different location on an OBD1 GSR and reads at a different voltage etc. But i guess it doesnt matter as long as the conversion harness is dead on. My dizzy housing took a **** thats all there is to it. Full OBD2 everything except the conversion harness and ECU. the end.

 

hm, what exactly does the convrsion harness do? When i wired my h22a4 up to my p28, I just switched to the OBD1 dizzy and put all the wires n the respective positions for the p28 and that works fine. Are you saying that the conversion harness uses some type of voltage manipulation?