sikcrx80

ok i got a 98 GSR (obd2) and i did the convo to Obd1 and just was wondering
do i need to run the crank sensor. i am getting code 15. i have did a LSvtec swap in it and idle is all up and down and can get it to keep running stalls out. now i didnt
put the crank sensor back in because obd1 doesnt need it.
i am running obd2 harness and distributer too.

sikcrx80

ttt

JimBlake

Code 15 is the ignition output signal. Not the same thing as the CKF.

Your OBD-1 ECU probably is not capable of throwing a code for the CKF, since there wasn't a CKF in OBD-1.

Blown90hatcH

CKF is not used on the OBD1 ecu setup. You don't need it. Code 15 is not the CKF as stated above. Is the distributor known good?

sikcrx80

ya the distributor was good last year befor he blew his motor up.

SkimN

are the distibutors the same for OBD1 and OBD2?

sikcrx80

as far as i know the distributors are different.
i was told i do need crank sensor. i was thinking in obd 1 that there is a sensor in the distributor and not on crank and thats why it sint needed.

Blown90hatcH

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sikcrx80 &raquo;</TD></TR><TR><TD CLASS="quote">as far as i know the distributors are different.
i was told i do need crank sensor. i was thinking in obd 1 that there is a sensor in the distributor and not on crank and thats why it sint needed.</TD></TR></TABLE>

I think you are getting them confused. The OBD2 setup uses a crank fluxuation sensor (CKF) that is located on some cranks. The OBD2 distributor still uses the crank position sensor (CKP) and that is why the OBD2 distributor is still compatible with the OBD1 ecu. The OBD1 ecu does not look for that CKF sensor and therefore, it isn't needed.

The distributors, electronically, will work the same for OBD1 or OBD2 in this application.

Who made the conversion harness?

sikcrx80

i dont remember who made it but it was someone who sells them.
if someone whos got obd2 car with obd1 jumper harness can they unplug there crank sensor and see for me..

Blown90hatcH

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sikcrx80 &raquo;</TD></TR><TR><TD CLASS="quote">i dont remember who made it but it was someone who sells them.
if someone whos got obd2 car with obd1 jumper harness can they unplug there crank sensor and see for me..</TD></TR></TABLE>

Yes without any issues.

JimBlake

Code 15 is the ignition output signal. It's not related to the CKP, CYP, or TDC sensors in the distributor. If it was any of those sensors, there's different codes for them.
4 = CKP sensor
8 = TDC sensor
9 = CYP sensor

The ignition output signal is the circuit that the ECU uses to tell the ignitor to fire the coil.

sikcrx80

well the only thing we have changed this year from last. is the i didnt plug in the sensor for the secondary for the butterflys and the knock sensor is disabled and that crank sensor.
well i check the distributor and its all hooked up right. i just got no clue what else it could be
so thats why i am going to try crank.
what do u guys think it might be???
anybody try to unplug there obd2 car with obd1 harness swap and see what it might do?

JimBlake

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sikcrx80 &raquo;</TD></TR><TR><TD CLASS="quote">well the only thing we have changed...
</TD></TR></TABLE>
Ignitors can go bad, wires can develop corrosion & bad connections, regardless of what you change from last year.
Code 15 points to the ignition otuput signal.
Check the trigger circuit from the ECU to the ignitor, then check for a bad ignitor.

EE_Chris

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sikcrx80 &raquo;</TD></TR><TR><TD CLASS="quote">anybody try to unplug there obd2 car with obd1 harness swap and see what it might do?</TD></TR></TABLE>

You mean unplug the CKF sensor on an OBDII motor while it's being run by an OBD1 ECU?

Nothing happens. The OBD1 ECU doesn't have an input to accept the CKF signal.

sikcrx80

ok i check today to see what codes we are getting 10,14,36 ya 36 and i dont think there is anything for it..

JimBlake

10 = intake air temperature sensor
14 = IACV
36 = ???

I think I read something about code 36 just a couple days ago. Something that doesn't exist on USDM cars. I don't remember the details, but I bet you could find the thread.

So... It's not a USA ECU, huh? There's a few other differences with non-USA ECUs.

sikcrx80

hey does anyone know where the intake air temp sensor is located. is it the one on top of the throttle body. i am running a ITR one

JimBlake

IAT is in the intake manifold, upper left of the picture, #18. The one on top of the throttlebody is the MAP sensor.

sikcrx80

ok i am running the AEBS intake mani and i got it off a guy who was running obdo maybe 1 would the sensors be different. the iacv not working maybe needs to be cleaned.
does anyone think these sensors could cause motor to run as bad as it does???

EE_Chris

What ECU are you actually running? What's the part number on it? Code 36 is for 'traction control', which US ECUs didn't have.

sikcrx80

we have in there a P28 right now

JimBlake

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sikcrx80 &raquo;</TD></TR><TR><TD CLASS="quote">we have in there a P28 right now</TD></TR></TABLE>That doesn't narrow it down much.
OBD-1 P28, right?
NON-USDM, but that leaves -um- everywhere else...

It also leaves me out, since I've only had USDM OBD-1 P72 so I probably can't help much more.

EE_Chris

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by sikcrx80 &raquo;</TD></TR><TR><TD CLASS="quote">we have in there a P28 right now</TD></TR></TABLE>

Just a regular old stock P28...not chipped or anything?

A P28 throwing a Code 36 is news to me. I don't even know how it's even possible, really.

sikcrx80

well i cleaned IACV just rying to get air intake sensor off. to change it. ill let u know how i make out.

DIRTYSLANGCHEZ

how would i be able to convert crank sensor over to a obd1 motor to be able to install engine back in and run off obd2 system (harness, ecu)?