i have a crx with a b16 from a 99si running a 0bd2 p73 ecu, using a obd0 to obd2 jumper harness. Car runs perfect and throws NO codes, question is why are these sensors unplugged and its not throwing codes. Also can you give me the names of each one.

 

1 appears to be either the vtec solenoid or the coolant temp sensor, 2 looks like the reverse light switch, 3 is the purge solenoid

 

the vtec solenoid is to the right attached to the vtec solenoid

 

the green thing is oil pressure switch and number 2 is reverse wires

 

like for the reverse lights? i can see the other ends of the wires in the harness... would there be a reason why there cut? should i go see if my reverse lights work?

 

This link should help. The 2 wires off your transmission are your back-up switch wires.
Rywire Plug Identification Page

 

yea i would check

 

should i be throwing codes without those 2 sensors hooked up?

 

i dont think so

 

well i thought the ecu needed to know the signal from the vtec oil pressure sensor to hit vtec.

 

mine doesn't even have the switch wired up and some jdm engines dont even have an oil pressure switch but im not 100% sure.

 

1 is definetly the oil pressure switch, ive never heard of jdm motors not having them, doesnt really make sence since the switch is there for the saftey of the motor.

2 is the reverse sensor wires like everyone else said. if its not hooked up with wont have reverse lights.

3 i have no idea, never seen it.

 

here is my ecu is this jdm

 

Yes

 

you dont need 3, when i did my swap i ened up taking it out

 

so does that ecu have a spot for the oil pressure switch, why is it not throwing a code

 

I believe 3 is called the Evap purge solenoid... I know for sure it has a hose that goes to the charcoal canister... And I didnt use it on either of my SOHC VTEC swaps (one in a CRX the other in a 95 Civic LX, both were D15B VTEC which dont have that sensor)...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mustbenu1 &raquo;</TD></TR><TR><TD CLASS="quote">so does that ecu have a spot for the oil pressure switch, why is it not throwing a code</TD></TR></TABLE>

Like said above, jdm bseries DONOT have a vtec pressure switch. Your using a jdm ecu so its not looking for that sensor.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Furyof4 &raquo;</TD></TR><TR><TD CLASS="quote">

Like said above, jdm bseries DONOT have a vtec pressure switch. Your using a jdm ecu so its not looking for that sensor.</TD></TR></TABLE>

Not saying you are wrong but can you prove that jdm b series don't have the pressure switch?

My obd0 jdm b16 definetly had one, and every wiring right up said you had to wire it it, along with 2nd o2, knock, and vtec solenoid. And I was using a pr3 ecu.

 

yea like i said above i think some jdm engines dont need the switch

 

I can say for sure, that SOME JDM engines come with them, and some do not... And too my knowledge there is no specific year/series, ect to determine if they do or dont...

I have owned 2 JDM D15B VTEC engines, one for my car, which did not come with the VTEC Pressure switch... It came with just a bolt in its place (so that one can be added)... Since I was running a P28 with it, I had to add one... And the other D15B was for my g/fs car, which came with the VTEC pressure switch... So this tells me that the P08 ECU (that runs the D15B in Japan) probably wont throw a code without it, but it will probably also know how to use it (should you have one)... So im sure the same goes for other JDM ECUs... I also can say for sure that the P28 ECU (USDM Civic Si/EX) will throw a code if the VTEC pressure switch is not there (my g/fs P28 is complaining of this very problem since I have yet to fix her wiring )... So my guess is USDM ECUs will throw a code if its missing...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by hybrid1990crx &raquo;</TD></TR><TR><TD CLASS="quote">

Not saying you are wrong but can you prove that jdm b series don't have the pressure switch?

My obd0 jdm b16 definetly had one, and every wiring right up said you had to wire it it, along with 2nd o2, knock, and vtec solenoid. And I was using a pr3 ecu.</TD></TR></TABLE>

JDM Obd0 vtec have it, Obd1&2 don't.

Edit: I'm talking about b series, I don't know much about d's.

 

^^type-r ecu on a b16. dont blow it up (~9000rev limit)

and yeah its true,,,that ecu doesnt look for vtec pressure switch so thats why there is no code..

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Furyof4 &raquo;</TD></TR><TR><TD CLASS="quote">

JDM Obd0 vtec have it, Obd1&2 don't.

Edit: I'm talking about b series, I don't know much about d's.</TD></TR></TABLE>

im pretty sure its only obd2 that dont have it..cause i got a bunch of motors here right now in front of my face

 

Pretty much all OBD0 and OBD1 have it, some OBD2 JDM do not therefore their corresponding ECU's don't require it, i have a couple if anyone needs them PM me $25