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#1
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Why Low Voltage at ACC Switchover Valve?
In trying to troubleshoot the many problems of the ACC in my wife's 83 300D, I noticed that the center flap always remains in the closed position. I checked the voltage to all the electomechanical switchover valves and all read 13 volts when actuated by the pushbutton control unit. #3, which controls the center flap, only reads 8 volts. I substituted another control unit from a parts car and got the same result- 8 volts. When I swap another lead from #2 for example, the valve opens. Why am I only getting 8 volts here? Where should I look for the problem?
Any help would be appreciated Rick
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80 300SD (129k mi) 82 240D stick (193k mi)77 240D auto - stick to be (153k mi) 85 380SL (145k mi) 89 BMW 535i 82 Diesel Rabbit Pickup (374k mi) 91 Jetta IDI Diesel (155k mi) 81 VW Rabbit Convertible Diesel 70 Triumph Spitfire Mk III (63kmi)66 Triumph TR4a IRS (90k mi)67 Ford F-100 (??) |
#2
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If the 123 is like the 126, the switchover valves have constant ground and switched power. The center flap switchover valve is an exception; it has constant power and switched ground.
Sixto 91 300SE 87 300SDL 83 300SD |
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