Automatic Transmission Electric Stuff

[JimVillers]

Checking the wires, switches and solenoids, I could not find a wiring diagram for the automatic transmission and I wanted to sort out how it worked.

It appears that the two pressure switches are wired in parallel and the wire disappeared into the harness.

It appears that when the throttle body idle switch is closed that the double acting solenoid on top of the transmission will push the rod down.  When the accelerator pedal switch is closed (full throttle) that the double acting solenoid will pull the rod up.       

I wondered what was the purpose of the two pressure switches and how they are wired into the circuit?

[ja17]

Hello Jim,

One pressure switch is for reverse, the other is for forward.  They complete the ground (earth) to the idle speed solenoid on the intake linkage and increase the idle speed when the car is in forward or reverse.
They are the source of the negative ground (earth) since they are bolted to the transmission. Yes they are wired in parallel.

The function changed on the later USA cars, a dash pot was added to the intake to increase idle speed in gear. The linkage solenoid was then used to increase idle speed when the AC was turned on.

As far as the wiring on the pressure switches, they are tied in parallel with one wire between the two and then onto the terminal block of the transmission with another "grun" & "rot" wire that goes to the intake  linkage solenoid. It should be one of the wires with a 4.3mm inside diameter ring terminal hole . There are three different ring terminal hole sizes.

  Power to the linkage solenoid comes from the fuse box #5 via a "swartz"/"grun"/ "rot" wire.

[JimVillers]

Joe .... Thanks, now I understand why two pressure switches and what they are for.  Everything is simple when you understand.

[Cees Klumper]

Everything is simple when you understand.

Reminds me of that famous (well, in The Netherlands) quote from our all-time great soccer player, Johan Cruyff: "you only get it once you understand it".

Joe to me illustrates once again how much there really is to know about our cars. What I don't get is how he remembers it all!

[jeffc280sl]

I hope this pic helps.

[JimVillers]

Jeff ..... Thanks for getting me to look in the correct area of the manual.  I found the exact diagram that I was looking for.

[mdsalemi]

Reminds me of that famous (well, in The Netherlands) quote from our all-time great soccer player, Johan Cruyff: "you only get it once you understand it".

Joe to me illustrates once again how much there really is to know about our cars. What I don't get is how he remembers it all!

Is this possible?  Does the NETHERLANDS have its own "Yogi Berra"? 

[ja17]

Hello Dan,

Thanks for the kind words.  The one nice thing about this group is there is always something to learn. Even myself have gained much knowledge from the group. New eyes always bring new ways of understanding things and solving problems. Different life experiences allow contributions to be made by many in the group. In some cases people have become engaged in special aspects of these cars and they have become experts in specific areas. Some of you guys are excellent teachers and presenters and contribute by organizing and documenting the information  for us all. Its a winning situation for everyone.

The characters and personalities add a little spice to the learning process and make it even more enjoyable. This is something which is not tech manual or workshop manual.

Of coarse the most difficult thing to perform on these cars is diagnostics. Procedures can be described in detail but diagnostics is where years of experience and good logical thinking really make the difference. This is where experienced experts like yourself and many others perform a most vital service to the group. Some technicians never become good at diagnostics.  Diagnosing problems from long distance, over the internet, is even more challenging. It's like fixing things by remote control (without sight, feel or sound).

My description of "wisdom" is knowledge with good judgement. Wisdom does not come out of a book. Wisdom is gained from experience and knowledge.

Thanks to all the other experts out there for sharing your Wisdom!

[Cees Klumper]

Is this possible?  Does the NETHERLANDS have its own "Yogi Berra"? 

Yes, Johan Cruyff is well known for his statements. Like, when the national Dutch team captain missed two penalties in a critical match, and the reporter asked Johan: "Johan, what is he doing wrong?" to which Johan replied "he is not kicking them into the goal". Or "In order to score, you must have posession of the ball". And "People think I am a faster runner than the others. But in actuality I just leave a little earlier, and that is why I get to the ball before the others". "The Italian's can't win from you, but you CAN lose from them". "Orange (the Dutch national soccer team's color) is a happy color".