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ACC info - flap and how to test
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Posted by Ari [Email] (#2847) [Profile/Gallery] (more from Ari) on Tue, 10 Apr 2001 15:07:07 Share Post by Email
In Reply to: ACC self test shows code (7c), Rob [Profile/Gallery] , Sun, 8 Apr 2001 20:24:50
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For info on how to test the system, and to see what the fault codes are, check out the Townsend site, specifically:

http://216.78.173.190/climate_control_folder/acc1codesall.htm

This applies to the ACC1 system.

For the specific fault code you have - 7C. There are three servo motors in the ACC1 system. One controls an air mixing flap. This mixes cold outside air with hot air from the heater to determine how hot the air is coming into the car. One controls the air distribution drum (selects between Vent, or Floor, or Defrost...). The third servo controls a flap that either pulls in outside air, or flips to pull air back in from the cabin (recirculation) When the self-test is run, the ACC moves the servos back and forth. Each servo has a little position sensor built right in. If the sensor doesn't see the servo move, you get a self-test fault. The fault you're seeing means that the sensor didn't see the recirculation servo move.

Now, the servo may not move for a few reasons - the motor is shot, the driver in the ACC is bad, or the flap is binding. Of course, if the position sensor is bad, the servo may move just fine, but you'll fail the test.

First off, try this - Put the ACC into recurculation mode (the recirc button on the ACC) - does the air flow change some, usually a different sound? If so, then the servo is probably fine, but the position sensor is bad. If you don't hear a difference, then the servo is either bad, or the flap really is binding. Remember, the ACC doesn't really know about the flap - it only knows if the shaft of the servo moves.

To access the flap, open the hood. Right at the base of the windshield on the passenger side (LH drive cars) there is a horizontal plastic cover held on with two torx screws and some clips. Remove it. Under there you'll see the AC condensor and the recirculation flap. Make sure nothing is stuck in there.

If you need to access the servo, you need to remove the glove box. There have been posts about it. It's not hard. NOTE: You DO NOT have to remove the glove box door to get the glove box out - if you remove the door, you'll never get it to fit right again.

Hope this helps some.
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