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USDM wire harness trouble...wiring gurus help.

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Old 03-21-2006, 07:03 AM
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Default USDM wire harness trouble...wiring gurus help.

i have a wire harness off a 94 del sol S that i am using for a JDM B18C. here is the problem:

i have 1 clip that is shapped like VTEC solenoid left out but i have no more sensors that need to be plugged. this was like that on my JDM d15b also. that plug (USDM) is colored yellow(solid)-black(stripe)/red(solid) blue(stripe). where did it go, what is it for, and do i need it?
Old 03-21-2006, 07:04 AM
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Default Re: USDM wire harness trouble...wiring gurus help. (the soL that could)

vtec pressure switch? does the plug reach the vtec solenoid? I don't have the diagram with me at work but I am pretty sure it is the vtec pressure switch. Can you take a picture and post it up?
Old 03-21-2006, 07:13 AM
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Default Re: USDM wire harness trouble...wiring gurus help. (B. Cruz)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B. Cruz &raquo;</TD></TR><TR><TD CLASS="quote">vtec pressure switch? does the plug reach the vtec solenoid? I don't have the diagram with me at work but I am pretty sure it is the vtec pressure switch. Can you take a picture and post it up?</TD></TR></TABLE>

it looks like the clip that goes into the vtec solenod/switch or a 2 wire circular/round style IACV switch.

i'm already plugged for VTEC and no check engine light. evreything runs fine. just need to know if i need this plugged in.
Old 03-21-2006, 07:49 AM
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Default Re: USDM wire harness trouble...wiring gurus help. (the soL that could)

what ecu are you running? JDM? Also where is the plug located? more towards the drivers side under the intake manifold? or near the vtec solenoid?

JDM DOHC vtec motors do not have vtec oil pressure switche so if you are running a USDM harness, you will have that extra plug.

If everything is running right then don't worry about it.
Old 03-21-2006, 08:35 AM
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Default Re: USDM wire harness trouble...wiring gurus help. (B. Cruz)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B. Cruz &raquo;</TD></TR><TR><TD CLASS="quote">what ecu are you running? JDM? Also where is the plug located? more towards the drivers side under the intake manifold? or near the vtec solenoid?

JDM DOHC vtec motors do not have vtec oil pressure switche so if you are running a USDM harness, you will have that extra plug.

If everything is running right then don't worry about it.</TD></TR></TABLE>

it's a USDM wire harness. running a JDM p72 (b18c) ecu. that round plug is located next to the iAT sensor. the iat is 2 wire plug that is green and red.

and i think the JDM wireharness does have both the pressure switch and solenoid.

Old 03-21-2006, 08:43 AM
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Default Re: USDM wire harness trouble...wiring gurus help. (the soL that could)

Oh that means you have a obd1 swap. OBD2 dohc vtec's from Japan has no pressure switch. The hanging plug is for the evap purge solenoid. JDM motor's don't have this and the JDM ecu's do not look for it.

If you plan on reffing your motor, you need to get the evap purge solenoid from your sohc motor and plug it in.
Old 03-21-2006, 08:50 AM
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Default Re: USDM wire harness trouble...wiring gurus help. (B. Cruz)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B. Cruz &raquo;</TD></TR><TR><TD CLASS="quote">Oh that means you have a obd1 swap. OBD2 dohc vtec's from Japan has no pressure switch. The hanging plug is for the evap purge solenoid. JDM motor's don't have this and the JDM ecu's do not look for it.

If you plan on reffing your motor, you need to get the evap purge solenoid from your sohc motor and plug it in.</TD></TR></TABLE>

cools... thanks. i plan on taking it to the state referee.

will the USDM ecu throw a code if this isn't plugged?

and one more thing... can i just connect the that wire to the sensor and let it dangle somewhere the state referee cannot see?
Old 03-21-2006, 09:03 AM
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Default Re: USDM wire harness trouble...wiring gurus help. (the soL that could)

zip tie it to something on the firewall. also is your knock sensor wired in already?
Old 03-21-2006, 09:33 AM
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Default Re: USDM wire harness trouble...wiring gurus help. (B. Cruz)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by B. Cruz &raquo;</TD></TR><TR><TD CLASS="quote">zip tie it to something on the firewall. also is your knock sensor wired in already?</TD></TR></TABLE>

obd1 jdm b18c has a knock sensor? my harness has only 1 clip that isn't plugged in. i'll check
Old 03-21-2006, 10:08 AM
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Default Re: USDM wire harness trouble...wiring gurus help. (the soL that could)

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

obd1 jdm b18c has a knock sensor? my harness has only 1 clip that isn't plugged in. i'll check</TD></TR></TABLE>

yup it has a knock sensor and the USDM ECU will looks for it.
Old 03-21-2006, 10:44 AM
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Default

purge soleniod.
jdm b18c does not use them, can convert it to iab.
Old 03-21-2006, 10:47 AM
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Default Re: (2lua)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 2lua &raquo;</TD></TR><TR><TD CLASS="quote">purge soleniod.
jdm b18c does not use them, can convert it to iab.</TD></TR></TABLE>

but since he is planning on getting it ref'd, he will NEED it.
Thats the only step you need to take to make a JDM B18C swap Cali legit.
Old 03-21-2006, 10:51 AM
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Default Re: (B. Cruz)

well in that case then he will need the purge soleniod from his old motor and run 2 new wire for the iab, if he want the iab to be function.
Old 03-21-2006, 12:32 PM
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Default Re: (2lua)

Just to Clarify..

to legally swap an engine in cali..

-The engine must be same year or newer than the car it's in..
-All emissions equipment that was with the engine must also be swapped..
-If the vehicle is California emmisions, it must get a california emissions engine.
-If the vehicle is Federal emissions, it must get a California OR Federal emissions engine..
-State Ref more than likely will not check ECU or function on OBD1 cars.. It can pass on NON-California emissions calibration ECU. however I have seen some cars fail using JDM and Federal calibration ECU's.. If it is a OBD2 car, make sure it's the correct ECU for the engine, and don't ever use a stolen OBD2 ECU in Cali.. If you buy one from someone, make sure you know what you're buying.. The ECU stores VIN number data on most cars they are removed from and cannot be removed.. That data is transferred to DMV when you smog.. BE Careful..

There are ALOT of refs that are black and white, and follow the book... They will not budge on these rules.. however sometimes you can find one that just really don't care wether the swap is legal or not so long as it passes tail pipe..
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