Well for some reason my a/c gave out and i couldn't find out why so i had help and the guy said he thought i was low on freon and the pressure switch wasn't getting enough reading but my main problem before i go on is that my compressor and cooling fan arn't getting power and the relay is good but he checked it out and he had by passed the pressure switch and relay to put freon in and he did find a little leak in the valve so he put in the stop leak fluid for the a/c system and he said my compressor made a weird noise and to his knowledge its bad but he also thinks my Ecu isn't sending a signal to my relays ground or something like that, that's why my relay isn't functioning and also what i did was when i took a test light and grounded it and touched the ground wire from under the relay the cooling fan would turn on so that meant it wasn't getting a ground right? so like i said the guy i had help thinks it is the ecu and i need a new compressor. . any suggestions before i go and actually try things out if anyone has any knowledge towards this please give me your 2 cents.

thanks guys

 

man... 40+ views and not one comment other then mine . . well if anyone is interested on hows it going im thinking its probably the a/c diode that can be a factor as to why my a/c isn't running right but im still in progress of doing one thing at a time i do have the service manual for the 5th gen as a pdf file online and i do have wiring diagrams so im going to check if theirs current running out of the ecu .

 

if that year uses a fan timer module like my 92 accord do,check it out,the main fan an ac fan relays both receive ground from that module. i have an schematic diagram home i can scan and post here tonight.

 

Thanks Fabian but I'm certain that they didn't have that module in the 5th gen tho i do love the 4th gen haha but I was looking into the wiring and all but thanks for the schematic but i already have a service manual i downloaded and works awesome for since it is for the fifth gen but I was looking more into thinks and I've concluded that the Diode might be my culprit or even the a/c thermostat but I'm almost certain its the diode unfortunately the manual doesn't really say where it is but it should be behind the climate control console thing so right now my dash is took apart but as to my reason why is because from the wiring diagram the compressor and relay leads back to the diode so my guesses are going to that hopefully either you or someone else can chime in on this and give me more information thanks guys.

 

well i haven't had much advise on this problem I'm having but i have eliminated the a/c Diode of being a potential problem as to why my a/c system isn't working so I moved on to the A/c thermostat which I am almost certain is the problem so I'm going to have to replace this if it isn't it then my next probability is the ecu which i really doubt it is.

 

If you have the PDF manual go through the A/C troubleshooting section 22 pg7. There is a possibility that it could be the ECU (pin B5 ACS) there are trouble shooting procedures for that as well.

Don't just blindly replace the thermostat, test it first. The test procedure is on page 992 (22-20)

 

yes the manuall is great tho i do not know how to pull out the thermostat because the dash is in but i did go throw the troubleshooting procedures that it recommends like having the middle pin jumper wired to a ground to see if anything kicks on and it didn't so it says replace thermostat so i guess when i pull it ou ill test it just to make sure.

other thing is the Ecu i really don't see anything in the manual for the ecu unfortunately but ill keep looking

thanks ghost

 

in order for the ac compressor to kick in you must have at least 65psi of refrigerent in order , you must also remember that it must have oil in the system, other wise bye bye compresor

 

yeah if i didnt state it before in earlier post i did check freon and its full as far as oil ive never really took freon out or messed with the a/c system but i shall check on that oil stuff but the compressor does work normal if i jumper a cable to it.

 

well i'm assuming you are just using the word freon as a general term for refrigerant since that stuff isn't used any more. but how did you refill your refrigerant? did you just buy a can from the autopart store and fill it your self or did you go to a shop and have a pro do it? all of the stuff you can buy to do your self that i have seen has the oil in it. also did you check the pressure of the system with a gauge of some type or just fill it till you couldn't get any more in?

i also agree with ghost that just throwing parts at the problem isn't a great idea. it generally just costs you more than it would have been to have a mechanic throw parts at your problem.

 

if you have accesss to set of manifolds guages, hook them up and see what the pressures are first and formost,and go from there

 

so I'm still stuck with no a/c and i just changed the a/c thermostat and still nothing and its making me sad. . but my next guess is a ground somewhere is bad like i had originally thought,

 

If it is too full, then it won't run either.

Will it run if you jumper the compressor with battery voltage?

 

Incorrect. There is no controlled inhibit for too much pressure. There is, however, a soft plug relief valve on the compressor that will discharge refrigrant into the atmosphere when too much pressure exists.

 

yes it does if i put a jumper to the compressor but either friday or definitely saturday i shall be inspecting the grounds to see if maybe that's the problem ah this heat is bad in Florida. well thanks guys hopefully it turns out good

 

The next thing to do is to find the pressure switch (or switches) and jumper them with a paper clip.

What year is your accord? ...and what engine if it is a multiple-engine year?

 

im pretty sure i stated the vehicle in the first post but oh well its a 96 accord f22b1 sedan MT

so an update while i was going through the process of elimination I put a voltage meter to the pressure plug like it says in the service manual and it says red white cable (+) and the other is ground and it only says .15 and varies but stays around .15 so im guessing that means no voltage right? so that would means it says from the service manual "Repair open in the RED/WHT wire between the A/C Diode and the A/C Pressure switch does that mean maybe theirs a tear in the wire in between the two?

 

okay now im starting to get mad with this unfortunately i re-checked the pressure switch to make sure it had voltage and it did the reason it didn't earlier was because i never set the car to the on position so that's fine so i got up till the troubleshooting where you put a jumper cable from the blue/red wire of the thermostat to a body ground and technically the compressor and both fans should turn on so i did it and only the fans turn on no compressor clutch action but if i put a jumper cable from a power source straight to the compressor it does turn on which is making all this mind boggling.. i really need some words of wisdom i have appropriate levels of freon and pressure and the pressure switch is good and the cooling fan switch is good i've tested the a/c diode and thats good current only going into one direction all fuses and relays are good so whats next im thinking a ground maybe but even then i've checked and im even hesitant to think its the ecu but i know its not because i even went through the trouble to check if theirs voltage coming out the ecu because i do have the wiring diagram so i definitely checked that but sadly im not getting anywhere . thanks in advance guys and if your reading this and at least answer.

 

I will have to check the manual but I am almost positive that the ECU delivers a ground as an output to activate the a/c system. I would check that before I did anything else.

 

Are you saying that the compressor relay is not getting ground? The WHT is hot from the fuse, the BLK/YEL is hot...no ground to RED/BLU (using a 94 wire diag so I can't be sure on the colors, sorry). I ask because there should be three realys in this. Cooling fan (right/pass side) realy in the underhood fuse panel. Condensor fan (left/drivers side) realy loacated on the drivers side of the radiator. Comprsor relay..next to the condensor fan realy. You said something about manually grounding a relay and the fan came on, but are you having to manually ground the compressor realy to make the compr run?

 

yes poorman you are correct if i manually ground the compressor relay also it does run (compressor) so i dont know whats going on

also i troubleshooted the radiator control module not to long ago and the last one on the list which is checking for voltage on the WHT/GRN wire and it says aproximately it should be 11v mine read a little over 13 would that be an issue or not? also upon troubleshooting the control module on the first list said test for voltage on the to body ground on the black wire and it should read less then one volt and mine stayed at 0 but did flicker to .5 but back to 0 so i doubt thats an issue right? thanks poorman and others.

 

and yes poorman im taking a test light and touching the (Hotwire) which is a RED/BLU wire on the compressor relay and the compressor clutch kicks in and if i leave it there obviously the compressor will stay on until i remove the test light.

 

The red/blue wire you are grounding with your test light is the signal wire from the PCM which is a ground. The PCM sends a ground to the relay to engage the system. All relays have to have power and a ground or they will not operate. You need to back probe the PCM preferably with a quality meter and not a test light and see if the PCM is sending the ground signal. If it is then you have a short in the wire from the PCM to the relay.

 

Thay year Honda does not use freon. Its uses 134a Refrigerant.

 

I am sorry HonBeer thanks for pointing that out you are totally correct i don't know why i say freon i guess im sort of ignorant on the a/c subject haha but your right its refrigerant 134a which i have been filling my car up with.. but pressures are fine so i dont know what the problem im about to just give up on it i cant look into until Tuesday but im just thinking of manually making a switch with a relay to both compressor and condenser fan rather than just trying to go about it the hard way since i do have the manual and properly did the troubleshooting at least twice and i did check the grounds on the side behind the bumper which is basically harness and those are fine so yeah... any more ideas guys?

thanks in advance and HonBeer for correcting me