Question about 1995 Jeep Grand Cherokee

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Have a 95 grand jeep chrokee limited 5.2 liter pcm will not ingauge AC clutch relay

Send 12 volts to pcm light green wire and all ready have 12 volts coming from low & high pressure switches to pcm and computer still does not ground ac compressor clutch relay?

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  • Jeep Master
  • 2,005 Answers

The AC compressor has a "shutdown switch" when not enough refrigerant is in the system run a wire from the

run a wire from the + battery cable to the compressor pulley switch with the engine running, ac on if the compressor clucth engages (turns) you have low refrigerant charge





=

Posted on Feb 05, 2013

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Posted on Jan 02, 2017

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Anonymous

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SOURCE: 1999 Jeep Grand Cherokee AC high pressure switch tripping.

did you add freon to your system if so how much try letting some out.

Posted on Aug 29, 2009

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AC of my 2003, 2.7lt CRD, Jeep Grand Cherokee, has recently been re gassed, it cools ok initially but for 5 to 10 minutes only, error codes 22 and 52 indicated.


its not one fuse, sorry, not at all
and you failed to scan the PCM, why skip this? it tells you whats UP.
only 2 things cause that (electronics logic)
1: The hi/low pressure switch tripped,
2: or the AMP the AC logic module (has bad inputs)
is this is USA car, ? seems not. but is it?
as non usa cars are different.
ill now answer, as if it was....
our cars have 2 HVAC systems (chapter 24 in Serv. manual.)
manual or AZC, no photos of your controls, so will toss coin on AZC auto zone controls (see Display there with graphics and temp, mine shows, 74F like the books shows. and 4 knobs not 3.?
The AXC system has operator self diagnostic mode,
need that, its in the manual, see last link below,a free book.

fuse JB20 run this controller. but only on gas engines.
as does, JB F21 and PDC fuse 21. (you 2 fuse both 21)
JB is cab box, PDC is hood fuse box next to clutch RELAY.
That logic resides, in the AZC and the PCM
the PCM runs the clutch relay directly
the diesel uses different wiring and fuses.
PDC Fuse 16 and F21 are diesel , fuse for the clutch.
i suspect you failed to check all fuses.
lets do the flow of logic, and you will see.
you have the A/C turn on via the AZC controls.
it sees its (guess) its too hot in the cab
the AZC then sends a MESSAGE down the network.
the PCM sees that and the BCM,
the PCM if the engine is not overheated and the hi/low switch is not tripped, (called by jeep pressure transducer A/C)
then the PCM energizes the clutch relay.
The BCM helps with directing traffic. (bcm prevent evap freeze up etc....)

so there are 3 things you can do.
1: this time check all fuses, not just the one, (RTM read the manual for our car in your country)
2: scan the PCM for A/C errors. (posted now over 1000 times)
3: run the AZC if opted day 1, self test, and the 50 errors possible there. chapter 24.

click WJ jeep, here, read chapter 24
then 8w wiring chapter on A/c
and keep in mind there are systems, manual and AZC
and they are NOT the same.

all free, USA only this is a USA forum not say Europe.

http://www.morris4x4center.com/knowledge-base/index.htm?utm_source=cj#service

Dec 28, 2016 | Jeep Grand Cherokee Cars & Trucks

1 Answer

Pin 51 (pink wire) coming out of the pcm has 12 volts with ignition in the run position


Well ,then the PCM is not fine , send it back . Go to a salvage yard an get a used one . I had problems with PCM/ECM'S from them ! I have had better luck with used one's from salvage yard .

Oct 27, 2015 | 1994 Jeep Grand Cherokee

1 Answer

No want to start,no light check engine on,


Maybe I can give a little help. Do you have the 4.0 liter straight six engine? This should apply as well if you have the V8 engine.

:...no check engine light...:With key on, does the light turn on? If not, it may not be getting power. Have to check that first, check all fuses in the under hood relay/fuse block. The check engine light should turn on with key in on position, just as an alert that the PCM is powered, and ready to work.

"...no electric to coil..." With key on, the dark green/black wire to the coil should have battery voltage. In that fuse/relay block will be a relay called an Automatic Shut Down relay (ASD relay). When the PCM turns this relay on, power is sent to the ignition coil on the green/black wire. The power feed for the ASD relay is fuse 2, a 20 amp fuse in the Power Distribution Center -the fuse/relay block under the hood.

So you have a couple of things to check: Make sure the PCM is powered. If it is, hold your finger lightly on the ASD relay while someone turns the key to on. You should feel it click on. If it does, but no power at the coil, check if fuse 2 is sending power to the relay, and check the green/black wire from relay to coil. If no relay action, possibly a bad relay, or the PCM is not turning the relay on.
Good luck. Let me know what you find.

Jan 04, 2014 | 1995 Jeep Grand Cherokee

1 Answer

Where is the fuse for the air conditioner in a 1994 jeep cherokee


THERE ARE more than one.
you can check them all, or lean how the system works.

there A/c has many.
the blower fuse must be good, or A./C shuts down
the AC amp logic box (brain) needs 12v and a good fues.
the relays both have fuses. for clutch and fan. up front.
must I post photos of them all.
or why not read the operators guide, it cover this.?
as does the FSM book ( sorry, i know books are taboo here)
or alldata.com
and the free book, posted over 1000 times.

XJ jeep , we have the 1993 free book only, my guess same.
my guess, the clutch dead? that it, just a clue helps
we can find true cause (elect) for no clutch in 5 min work and any $10 volt meter....
read the HVAC chapter yet, and the Diagnosis there>?
is the hi/low switch 12vdc on both sides? i do that first.
or do fuses. sure.
is the blower blowing in dash?

see hvac here.
then see wiring and go to A/c pages.
see all there is.
wiring
cavite 9 and 12 in fuse box. must be good, blower and a/c labeled.
on page 10 xj

pdf wiring page 198 cover the a/c wiring, xj
and shows, F12 fuse runs the first relay./
on this car the PCM controls the relays,
do you have the climate control option, this needs to be known first.
if the hi/low freon switch opens
the thermostat goes dead.
if it goes, dead the PCM sees, no damand for a/c and drops the clutch off line, and for other reasons too.
fuse 5 kills the blower, it gets power from ignition feed.
page 199 in the pdf.
the book mixe XJ and YJ and 2.5L and 4.0L engines,
so look carefully
but F12 is a/c clutch power.
there in the PDC<
and the relays for clutch and cond. fan.

why not post symptoms;??????????
is the clutch dead.> is that it?

dah book.
http://www.jeep4x4center.com/knowledge-base/index.htm?utm_source=cj#service

May 28, 2012 | 1998 Jeep Cherokee

1 Answer

I have a 95' Jeep Grand Cherokee Limited with a


Are you check your previoud questions: check_engine_error

Keep us updated.

Jun 07, 2011 | 1995 Jeep Grand Cherokee

1 Answer

Asd relay has no power to the pcm and fuse panel inside has only half power run jumper wire to dead fuses and dash lights up and pcm powers up and jeep will start and run till jumper wire is removed


Hi, pull out the ASD relay and use a 12 volt test light to interrogate the relay socket. Hook your test light clip to ground and probe the terminals of the relay socket. There should be one hot terminal when the key is off and 2 hot terminals when the key is on. One of these is the power from fuse 6 and the other is from the ignition switch. If these are good, suspect the PCM is not turning on the ASD relay or the relay is bad. You can check for the ground signal from the PCM by moving your test light clip to battery positive and probing the other terminals in the relay socket. Again, one terminal should light the light when the key is off and both should light the light with the key on. If not, the PCM is not turning on the relay, and you should suspect your anti-theft system. Please let me know if you have questions, and thanks for using FixYa.

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Jun 05, 2011 | 2001 Jeep Grand Cherokee

2 Answers

I have a 1997 grand ckerokee limited v8 and ac not coming on or working


There should be a 12 volt wire at the compreser pump that engages the electric clutch, using a test light see if there is power there when AC is turned on. If you do not have power there check for fuses, if there is power there its low on AC gas.

Jun 02, 2010 | 1997 Jeep Grand Cherokee

1 Answer

2001 jeep grand cherokee no start, no cam signal or ASD control from pcm


IF YOU PULL OUT CAM SENSOR YOU HAVE TO PUT A TOOTH PICK IN THE TWO HOLES ON THE TOP AND THEN PUT IT BACK IN AND FACE IT TO THE BACK OF THE ENGINE.KING OF 4.0

May 09, 2009 | 1999 Jeep Grand Cherokee

1 Answer

After i start my 95 jeep grand cherokee limited


crank or camshaft sensor will cause this, a bad crank sensor will cause it not to start or start hard. it controls timing and sends info to pcm for proper fuel mixture and spark at the right time.

Apr 05, 2009 | 1995 Jeep Grand Cherokee

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