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Posted on Nov 12, 2008
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95 honda civic p28 ecu code 14

Ive replaced the iac valve and still keep getting the same code ive changed the relay for it and still nothing any suggestions?

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Jeremiah Meyer

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  • Expert 204 Answers
  • Posted on Nov 12, 2008
Jeremiah Meyer
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Joined: Nov 10, 2008
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Check the wiring between the relay and the valve as well as between the relay and the control source for any loose connections. Hope this helps!

Sincerely,

JC

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My Honda Civic won’t start it has a b16 just swapped in has the p28 Ecu i have spark and fuel to the rail but still just cranks and cranks

limited information generic answer ---is motor compatible with vehicle and ecu ---was ecu flashed to vehicle
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Honda crx with auto transmission idles roughly in drive or reverse. AC on makes it worse.

There are two coolant lines that connect to this Honda IAC to help quiet the operation of the valve. The part number for a OBDI 1992-1995 Honda Civic Idle Air Controller is 36450-P28-A01. While the OBDII version of this valve is 36450-P2J-J01, and the two units are very similar in design and execution. The EACV or Electronic Air Control Valve is a big part of maintaining your Honda Civic idle. If you've checked your IAC and your Honda still suffers from a surging idle, check your FITV. This Honda Idle Air Controller or IAC is under the throttle body and incorporates into the throttle body passages o locate your Fast Idle Thermo Valve, remove the intake snorkel and locate the FITV beneath your throttle body opening. If your SOHC engine is still having problems, check our guides above on how to check your FITV as well as your IAC. To check this operation, remove your air intake pipe and use your fingers to plug the passages in the lower left hand corner of your throttle body opening. If your idle surge does not go away, unplug your Idle Air Control valve and if that stops your idle surge, your IACV must be replaced. Follow our instructions on how to replace your Honda Civic Idle Air Control Valve. Need to raise your Honda Civic idle or having problems maintaining idle? You can adjust the base idle by unscrewing or screwing in the Idle screw on your throttle body. This screw allows air to bleed into the passages on the backside of your throttle body, as shown above. To learn how to adjust Honda Civic idle speed, you will not need to remove anything. With a standard screwdriver, simply locate your throttle body and Idle screw.
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Runs rough, won't accelerate past 3200 rpms, showes codes 4 14 16,

old god, love em. 4cyl? or D5Z1?
ill answer for
the harder the better, for me, a challenge.
so did you look up those codes, google them (millions of hits)
i guess not.
so
4. crank sensor dead.
14 IAC , bad idle controls.
16 fuel injector issues.
best of best is....
here, then click OBD1 (relics)


http://www.troublecodes.net/honda/

we always fix spark first, cant burn fuel with bad spark.
so code 14.
the CKP is bad, or not plugged in

ever seen an FSM
http://hondatech.info/downloads/Auto/Manuals/Civic/

im not sure above, covers 14s.
but it is a malfing CKP sensor and the ECU never lies about that.

the signal is weak or dead, or drops out 1 in 10 hits.

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I have a 1992 Honda civic lx with a 1.5 four cylinder, and Ive replaced the ignition switch the fuel pump relay and the fueled pump itself however, the fuel pump still doesn't prime when I turn the key...

no start , crank perfectly
so , got spark?
the ECU has programming (ROM) and in fact kills all fueling with no spark , (even if it thinks there is no spark, even if spark is ok)
all ECU use a way to read back spark quality, (ALL){LAWS}
how honda does it in code, i don't know , see C R O M E forum)
turn the key over means nothing to me.?? sorry, it doent/
try saying what postion? cranking? or just keyon.
now some more EFI rules.
The EFI (some) do not activate the pump relay until cranking.
some do just key on for 3 seconds, read the FSM, its free.
need a link to the free manual? read the ECU logic on that.?
and prime has a special meaning, it means purge air,
its not for fuel. some system send a fast prime pulse. to clear air from the pressure lines, this plus does not inject.
that is how EFI works,

the flow
1: key on, ECU sends prime pulse, (air purge)
2: some ecu, run pump for 3 seconds, and pressure hits 35psi? RTM.
3: all ecu activate pump cranking and running.
4: now check pressure. !" 36 psi FSM stated spec"
5: now crank, if the ECU sees no spark errors, it injects
6: if the ECU sees WOT. it stops injection to clear a flood, cranking.
those rules cover most ECU made.

honda this year has a special feature called,
Fuel Cut-Off Control'
if this messes up, it i can cut fuel
does this help?
even better is this site, (has all the facts..)
http://honda-tech.com/showthread.php?t=810101
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The 1999-2000 Model Honda Civic uses an OBD2B connector for the ecu. I am changing my ecu to a programmable OBD1 PO6 or P28 ecu. Therefore i would need a jumper harness from OBD2B to OBD1. I already have...

The reason you can't find the connector you want = it's illegal to replace the OBD2 PCM with a OBD1 controller for any vehicle registered for the street. This is a felony on the Federal level and also several States. If you are only using the car for the track, it's ok. You may try a raceing supplier like Summit, etc. to find one.
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1989 Honda Civic Diagnostic Codes 7 and 14

Code 7: TP Sensor (throttle position) defective circuit or unplugged/defective sensor.
Code 14: IAC Valve (Idle Air Control) defective circuit or unplugged/defective sensor.
Hope this helps you.
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Turn singal problems

if i remember right the flasher is located on the back side of the fuse panel
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I990 honda civic

theres alot of things that can cause this condition one is( TPS ) second is (IAC) idle air control valve wich can cause surging problems your pulling #14 code check for broken or cracked vacuum lines listen for hissing this wont show as a code unless a scanners hooked up so you can watch the increases and decreases on the engine
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