99 Escort compressor not engaging (except every once in a while in the
morning for a short while.) Checked the CCRM. Pin 21 has voltage, as does
pin 22 when the air is off. When I turn it on, pin 22 goes to 0 volts. The
info I have says if pin 21 has voltage and pin 22 does not, then the
computer has grounded the relay to prevent compressor operation. The
computer is sensing an engine performance problem and will have to be
diagnosed and repaired for clutch to work.
The motor seems to be running fine.I did plugs,wires,fuel filter and fuel
injector cleaner.No help. Any ideas what I should look at next?
Thanks in advance,
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i have the same problem on a 93 taurus... the compressor just stopped
working...i followed the book's instructions and turned the a/c on MAX
and the blower on high... had the key turned on to run or let engine
run... then checked voltage to the wire going to the cycling switch on
top of the accumualtor.. got voltage there.. then went to the
CCRM(intergrated contol module) and had voltage to the pink/lt. blue
wire at pin No. 21.. the book says that you have to remove the RED wire
to pin No. 22 (witch is probably an error as the RED wire is on Pin .
24. i cut the wire and the fan came on, the clutch then engaged.... it
says if you then get voltage that it is either the Throttle Position
Sensor bad giving the PCM(power control module) a signal to cut off the
a/c or its the Engine Temp.. Sensor(the one with two wires attached to
it) that gives the PCM the reading of high engine temp...(not the temp.
sensor with one wire on it that goes to the Dash board telling you that
you got a hot engine.)...... the book goes on to say that you disconnect
these sensors and the a/c should now work(as the PCM is not getting
these signals to turn the compressor off.... but it did not work for
me.. i unplugged them both and it still would not come on.. i then
tapped on the relay module and the throttle Pos. sensor and for some
unkown reason i got back in car and turned off the engine and took out
the key and then started the car up and the a/c came out cold... OK, its
fixed, but how??? so i put the black/yellow wire coming out of the relay
control module and put it back onto the rest of the a/c clutch wire( i
originally had cut it so i could test for voltage there without
listening for the a/c to click ON... well i though that was fixed.. no
go.. NO AC.... i then take the wires off and double check the wires to
the inside of the pins on the plug to the relay(all 24 of them ... i
used straight pins, stuck it into the wire about 2 inches away from the
plug to the relay and put the ohm meter for continuity, one wire to the
straight pin and the other to the inside of the plug on the pin and they
had continuity to each pin to wire.... i then used a small wire
brush(with the key off) and brushed all the pins in the plug and the
contacts on the relay to make sure there was no corrosion.. i did the
same to the throttle Pos. sensor and also to the Engine temp. sensor. i
also checked for continuity from it wires to the inside of the harness
and there was continuity.. i took the throttle pos. sensor off and went
to auto zone and they tested it... (not all auto zones test them) the
first one i went to checked it and said it was bad on one side... i got
another one and opened the box and it looked used.. i did not get it..
went to another auto zone and the guy told me he does not test them, he
cant find the equipment..... i then say give one one.. he brings it out
and its the last one also... i look at it and asked is it rebuilt as its
all scratched up.. he checks it and says yes he can see it was used, but
they dont take elect. parts back so he dont know.. i then go to napa and
get one for $5 cheaper than auto zone and put it into the car and have
the same problem... i did notice that i get voltage to the a/c line
sometimes.. it seems that my contact points (if they have them in the
relay module) is sticking.. but when you eigher turn the engine off or
cut the RED wire to pin NO. 24 that the relay is released and the a/c
works....after putting the wire back on and starting the car back up....
i also have a 96 contour and it might be similar to your car(its
different than the 93 taurus, they have other cut off for the a/c..
i got the shop manual from Helm and got the electric/vacuum trouble
shooting guide from them also... $65, $32 respectfully.. when i get to
the heat of it, it refers you to the PCM book( the Power control Modue
Troubleshooting book.. i went to the Helm web site and found that the
book is in paper and cost $300 so thats out for me...
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