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83 300SD Door Locking Vacumn Pump Problem
I have avoided chasing door locking problems since I got this car several months ago.
I started in the trunk by checking the pump and it seemed to have a loose electrical connection after addressing that and getting the pump to run I had the vacumn line disconnected and found the pump pumping air OUT not a vacumn as I expected. As a vacumn pump this does not seem right. Is it wired backwards? Or what. Any suggestions would be appreciated
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________________ 83 300SD 280K 78 240D 200K+ sold 10/07 94 BMW 740IL 220K |
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Answer
the vacuum pump exhaust is air pressure.
It generates vacuum in the central locking system. Have a great day.
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ASE Master Mechanic asemastermechanic@juno.com Prototype R&D/testing: Thermal & Aerodynamic System Engineering (TASE) Senior vehicle instrumentation technician. Noise Vibration and Harshness (NVH). Dynamometer. Heat exchanger durability. HV-A/C Climate Control. Vehicle build. Fleet Durability Technical Quality Auditor. Automotive Technical Writer 1985 300SD 1983 300D 1984 190D 2003 Volvo V70 2002 Honda Civic https://www.boldegoist.com/ |
#3
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Testing the pump
Before I sell the vacuum pumps, I test them with a 12 volt source. In my case I use a battery charger.
I apply the negative cable to the brown wire of the pump. Ground. Applying the positive to one of the other wires will make the pump push air or suck air. Depending on which wire I started with. The pumps I work with are the ones with the three wire pig tail. The newer ones have a second connection. I don't get into those yet. Looking closely at the pig tail you will notice it's shape. There is a flat surface on the round male plug. In order not to plug the pump in incorrectly, the male plug inserts so the flat part contacts it's mate within the female part. I can not confirm if the pump it always suppose to "suck" air when connected correctly. But if you can match up the color of the wires from the car with the pig tail your task is done. |
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I just went got done working on my lock system (83 SD), i found that I have a bad chip in the circuit board. The pump will create a vacuum to lock the doors and create pressure to unlock.
If the pump is working when you unlock and lock the drivers door then you probably have a vacuum leak in the yellow line. The line runs down the passenger side under the carpet. There is a connector that splits the system by the passenger seat, you can start here and isolate half the system by disconnecting the T and checking for vacuum. If you have no vac. then the problem is between there and the trunk. Good vacuum tells you that the problem is from there forward. On the 3 wire conector the brown wire is ground and the blue wire controlled the lock and yellow the unlock. If the pump doesn't seem to be running if you when you lock or unlock the drivers door check to see if you have power at the pump with a test light. Hook the test light up to the brown and the yellow or blue, then lock and unlock the drivers door the test light should come on in one of the positions. Then test the brown and the other wire, The light should come on in the opposite postion as the last test. If nothing happens no pump or light remove the driver side door panel and check the lock accuator, it is mounted with 2 8mm screws to the inside of the door. (follow the door lock pull) There is a 3 wire connector here (yellow, blue and black/red) check for power with your test light at the R/B wire, this should have power all the time. The yellow and blue wire good directly to the pump. If you have power try jumping the R/B wire to the yellow and blue wire one at a time. If the pump runs the accuator may need to be cleaned. If the pump dosen't run the wires may be broken, they usually break where the door hinges. Hope this helps |
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Look at post #13 of this thread. I have and 83SD and this is the system as I have found it.
http://www.peachparts.com/shopforum/showthread.php?t=150356
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1983 300SD 200000miles |
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Quote:
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82 300SD 202K 82 300SD 233K 83 300TD 340K 82 300TD 98k euro (parts on the hoof) 85 300TD 282K 83 300TD 197K Last edited by Johnt49; 10-23-2008 at 02:17 PM. |
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