Automatic Transmission Basic Solenoid Testing

Automatic Transmission Basic Solenoid Testing


okay there’s a tool this is a General Motors special tool but you can do a similar thing with just about anybody’s solenoid where the the solenoids themselves are removable now there are some solenoid jacks where the entire every single solenoid is in one package and you’ve got to change the entire thing you’re going to have a hard time test in that but this has as you can see a bunch of air nipples connected to it and then on the back side it has passages where we can connect a solenoid to it okay so I’ve got one solenoid connected there this solenoid has an electrical connection it’s just two wires and then alligator clips to connect it to a battery the power supply which I forgot to get out so let me get my jumper box out of here when you guys use a jumper box on a stainless steel top bench with cable need to have some insulation somewhere maybe grab some fender cut or something so that we don’t short something else but I’m going to connect damn you’ll get it any third no okay so let me tip this to where you can see it I’m just connecting power to the jumper box and listen to the click that’s the on-off clicking that I’m talking about now this is a normally open solenoid so it should blow air through it always this is going to be pretty noisy [Music] that’s a bad solenoid it’s leaking – so should should it eliminate all yes all hair pressure so let me stick one end let me stick another one in I’ve got four different solenoids here okay uh plug the air in again that’s what it should do and when it shuts off that’s when that valve and the valve body would a pressure build up and move it there’s another one let’s see if this one clicks hey it clicks well these are different size holes for different solenoids you want to make sure that they click before you hit the air tool right this one clicks oh good and one last one see if it clicks no clicking so we’ve got one that clicked but didn’t seal we have two that clicked and sealed the air pressure and then one that doesn’t click at all and if we have the air hooked to it it just always always be going through it now these are all normally open solenoids there are some that are normally closed I’ve got an Allison Transmission valve body right here so here are those two pulse width modulated solenoids that told you about the color salt on a and B that actually do the shifting then we have three separate shift valves to position the shift knob so it’s ready to shift we have a torque converter clutch solenoid and then we have another solenoid to turn line pressure down in the islands when we get a quieter operation all of these solenoids that look the same that was different all of these are on-off solenoids it’s these great big ones are the pulse width modulated ones so they’re going to have different resistances let me just grab a multimeter real quick you’re going to have to do the same thing we’re just going to go to ohms and then you’re just going to do a resistance test of each solenoid so there’s 10 point 9 ohms 22 ohms and these great big ones remember it said they’re pretty low resistance five point seven arms as long as there is this is is different between the first this one notice it’s a different looking solenoid this is this is actually pulse width modulated also for the torque converter clutch slowly instead of just talking better cuts on ride on or off it’s it’s a miniature coach with nausea yeah so ease into it a little bit


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