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#1
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ACC II Problems
I need to make a new thread on this as im stumped, i dont really know where to go from here.
Okay so about a month ago the climate control wouldn't heat or cool air, it just blew outside air through. I found out the servo wasnt running when the temp wheel was moved. I check reistance on all sensors and the temp wheel. All measured within spec from the manual. Still the amp wasnt sending power to the servo. Yes, there is power and ground at plug of amp. I got a amp from George Murphy, SAME problem, servo will not run by itself. I tested the servo and the resistance is spot on in all positions according to the manual. Im stumped, i dont know where to go from here. I cant find the problem, everything seems to test okay. Thank you
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#2
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Two points
* What vehicle (for those who don't know).
* Please at least add a link to the old thread, so we don't suggest duplicate basic testing. Thank you. |
#3
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Well its on my 79 280CE, any 1977-80 W123(except euro and 240D), W116(except euro), and 1977-1982 on the R107.
It wasnt my thread, i just kinda jumped in at the end to see if anyone could help: http://www.peachparts.com/shopforum/diesel-discussion/304961-its-heater-season-acc-fun-2.html If anyone has any ideas please post, im stumped
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#4
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Hmm
Have you checked the heat box temperature switch?
MB# 0028211851 . |
#5
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I haven't, anyway to bypass that switch? Is that what we would call the evap temp sensor?
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#6
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Answer
Quote:
Try jumping the pins. The switch lists as $210.00 each. |
#7
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Im gonna look into that in my wire diagram and see how and if that ties into the amplifier and or servo wiring. Thank you
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#8
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I have been studying the wire diagram for this, i have been able to check and test all but one wire at the amp it seems. Looking at this diagram, PIN 2 at the amplifier(6) goes to the pushbutton unit(2). Can anyone tell what this wire does, could it cause me problems?
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#9
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Did more testing today. The servo and its feedback are perfect, no open spots, and resistance values are within spec.
If i manually run the servo away from "park" from the battery with jumper wires and then plug the servo back in, it will run back to "park" properly. That relay i mention in the last post is for the defrost, it tests fine. Ambient temp and in-car temp sensors ohm within spec. The only thing that was slightly out was when i measured the "sensor chain". Pins 3 nad 4 of the amp plug. I measured 4500 ohms,temp wheel at 65(spec is 2000+/- 1000 ohms) I got 5500 ohms,temp wheel at 85 (spec is 3500+/- 1000 ohms) The real problem is that the amp refuses to drive the servo when i move the temp wheel.
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
#10
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to add a bit of closure to this strange thread. Turns out pin 8 of the amp had voltage, but when under load it fell off completely. I ran another 12V switched wire to that and tapped into that wire to supply it with voltage and presto, everything works perfectly, even my new(used) aux water pump.
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1985 300TD Turbo Euro-wagon 1979 280CE 225,200 miles 1985 300D Turbo 264,000 miles 1976 240D 190,000 miles 1979 300TD 220,000 GONE but not forgotten 1976 300D 195,300 miles 1983 300D Turbo 175,000 miles http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg |
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