Chrysler Repair Questions? Ask a Mechanic for Answers ASAP
Hello, and thanks for your question, my name is ***** ***** I will do all I can to help.
Can you tell me if fuse 18 out under the hood, (blue 15 amp) is good and has power to it with the key ON?
If you pull the relay out and jump 30 to 87 in the relay socket, does the A/C clutch cycle then?
OK that's good, Do you have a digital volt meter by chance?
We need to check 5 volt reference signal to the PINK/YELLOW wire in that 3 wire sensor . should have 5 volts on when measured with red lead on PINK/YELLOW and black lead on NEG. battery terminal or some good clean engine metal.
You have a PINK/YELLOW wire in the harness that goes to the 3 prong switch right?
Alright, that is good.
the BLUE/GREEN wire, see if you have 5 ohms or less straight to ground.
Did you try another relay by chance? in the power distribution box?
If not, plug up your 3 prong switch and swap the AC relay with the horn or turn signal relay, ( I think one of them is the same relay) and see if it works then. Let me know what happens.
OK, that is right, it's got reference voltage from the ECM, and it's got ground, the other wire goes back to the ecm, did you try another switch yet?
Right, let me post the wiring diagram, is it 3.3 or 3.8L? and is it automatic climate control or manual climate control? manual will have red/blue colors I believe and automatic will have numbers.
No it's got a schrader valve on it.
just unscrew it quick.
It's a 3 wire transducer, so you can't just ground it, it's a varying signal to the PCM, I don't want to tell you to start jumping anything there because it could possibly cause some damage to the PCM, Here is the wiring diagram.
disconnect neg. battery cable and unplug and plug back in the PCM a few times. make sure no corrosion or bad connection there. measure pin 1 to pin 2 on the sensor itself when it's unplugged, (that would be PINK/YELLOW to BLUE/GREEN) make sure it's not completely open. Let me know what happens.
If PINK/YELLOW to BLUE/GREEN pin on the transducer is completely open, it's bad transducer. (or 3 prong switch)
I'm gonna have to grab some dinner, will be back asap. Let me know what happens.
sorry about that delay, it is near the battery as in this diagram.
The Light BLUE/ORANGE wire that goes from pin 64 from the ECM is supposed to ground the A/C relay at 85. So if you want to unplug the ECM and find the Light BLUE/ORANGE wire, it should read less than 5 ohms to pin 85 in the relay socket.
That's it. sorry about that delay I had a birthday party at a restaurant and had to drive back and only had cell service. thanks.
If you can see it in the harness, leave it plugged up and see if you get a ground on it when you cut the air on, by putting your red lead on battery positive terminal and your black lead through the wire somewhere. If you do and you don't at the relay socket, that wire is broken between relay socket and the ECM, if you don't get a ground at all, then Either the A/C control panel is bad and not sending a signal that your requesting the air conditioning, or the ECM is bad. Because we've checked everything else.
pin 64 on the gray connector. as in this diagram.
That is BLUE and ORANGE right? I gotcha, If your showing open circuit though, that's gonna be the culprit run you a new wire from 3 or 4 inches back from the ECM and 3 or 4 inches back from the relay socket and it maybe will fix it, or try to find the break measuring 2 or 3 inches at a time from pin 64 to back in the harness by poking through it slightly to hit the wire 2 inches at a time. Thank you.
So your showing an open circuit between pin 85 in the relay socket, (with the relay removed) and pin 64 at the ECM ?
It is definitely 85 on the relay that goes to the ECM that gets a ground when the air compressor is supposed to cut on.
OK then that is a problem, If you restore the connection between 85 in the relay socket and pin 64 at the ECM, then I believe you will get your compressor function back.
Is that fuse box all moulded together like the new ones are? or can you turn it over and see where the wires go into the relay socket pins?
check all the relay sockets for a reading. just to make sure your not confusing 85 with any of those other pins in that A/C relay socket, you are 100% sure your checking the A/C relay correct? just wanna make sure.
Yes, I'm looking at it now. Looks like this right?http://www.ebay.com/itm/FUSE-BOX-MULTIFUNCTION-MODULE-CHRYSLER-TOWN-COUNTRY-2001-2002-04869000AJ-OEM-/391802425482?hash=item5b393e908a:g:RcwAAOSwR29ZJ1Xk&vxp=mtr
It's sounding to me like your going to need that entire fuse box. From what your reading it sounds like to me it's got an open circuit in it.
If you check the resistance between the pin where BLUE/ORANGE plugs in at the bottom that goes to the ECM and pin 85 in the A/C relay socket and show more than 5 ohms, It's gotta be open in the box. Right?
I follow you, you might could run jumpers from the relay socket to the bottom of the relay to give you enough room to run a new wire to pin 85 from the ECM, but I think it would be easier just to put a another fuse box on it.
I have seen wires running out of relay sockets before, but it's not exactly what I would call the best repair. but, you could get a fuse tap maybe. looks like this probably fix it for a while anyway.
Absolutely, let me know what happens for sure.
Do you get a ground on that BLUE/ORANGE wire coming right out of the ECM when you turn the air on? should read 12 volts if you measure it between battery power. If you do get a ground there, then that is all you need to ground the relay and get power to the compressor, you jumped the relay and the compressor ran, so make sure the relay is good.
Your sure you ran it to pin 85 on the relay correct?
The BLUE/ORANGE wire out of pin 64 on the ECM should only be grounded when the air is turned ON, if the air is turned OFF, it shouldn't be grounded. make sure the defroster isn't on and the panel is off.
if you disconnect it from the ECM does it still show a ground? I wouldn't think so. per the wiring diagram, it should not be grounded all the time, otherwise the air comrpessor would run all the time.
Interesting, if you unplug it from the fuse box and the ecm you don't get anything right?
Oh jeez, that ECM should ground that wire when the A/C is selected. that is what grounds the relay. If it doesn't, then either the control panel or the ECM is bad or something else weird is going on. what's odd is the fuse box is open from where that wire connects at the bottom to 85 on the relay. So I don't want to say it has 2 problems but from what your telling me it seems like it does.
I follow you, send it down the road then correct?
Absolutely, Thank you and best wishes.