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How to Test your solenoids, actuators, and other turbo stuff

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How to Test your solenoids, actuators, and other turbo stuff

Old 12-03-14, 09:54 AM
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Great thread! Everything I needed to figure out my secondary turbo issues was here. I ended up ordering 9 new solenoids from Mazda (all except the purge solenoid and the WGA/PCA solenoids that I already replaced with MAC). At room temp, some of the brand new units tested out fine with 9v, but some were sluggish switching while under vacuum and some wouldn't switch at all. They all tested fine with 12v. YMMV.
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Old 12-19-14, 12:47 PM
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Any info on testing turbo wastegate actuators?
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Old 12-22-14, 07:43 PM
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Plug one nipple, apply pressure to the other, and if it opens at the specified pressure and does not leak, it passes.
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Old 12-22-14, 07:44 PM
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Originally Posted by ArmitageGVR4 View Post
Great thread! Everything I needed to figure out my secondary turbo issues was here. I ended up ordering 9 new solenoids from Mazda (all except the purge solenoid and the WGA/PCA solenoids that I already replaced with MAC). At room temp, some of the brand new units tested out fine with 9v, but some were sluggish switching while under vacuum and some wouldn't switch at all. They all tested fine with 12v. YMMV.
That's not surprising - more voltage = stronger magnetic pull.

The "release" test however is based on internal friction and the strength of the plunger spring and should not be driven by voltage / field strength.

David
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Old 10-05-15, 10:05 AM
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Originally Posted by beckrx View Post
I also learned from Ray that although the solenoids all look alike, there are specific part numbers for specific solenoids. The following are the number of solenoids needed, the part number and the purpose.
(3) 1480-13-240A. Double throttle control, charge control and charge relief.
(1) 1481-13-240A. Pressure regulator control.
(2) 1482-13-240A. Secondary air bypass, EGR.
(1) N390-18-741. Turbo control.
(1) N3A7-18-741. Secondary air switching valve.

Finally, the painted numbering/lettering sequence on the solenoid identifies what they are for. Ray said that there are two rows of painted numbers on each solenoid: the upper and the lower rows. The lower row identifies the solenoids as follows:
"1" corresponds to part number 1482-13-240A. Secondary air bypass, EGR.
"2" corresponds to part number 1481-13-240A. Pressure regulator control.
"3" corresponds to part number 1480-13-240A. Double throttle control, charge control and charge relief.
"82" corresponds to part number N390-18-741. Turbo control.
"17 corresponds to N3A7-18-741. Secondary air switching valve.
Originally Posted by dgeesaman View Post
They are certainly marked per location and the filter basket will be in the right location for you. But if you ignore the markings and move the filter baskets around I have yet to find any difference in build and performance.

Dave
I have been chasing a boost problem, thread here: https://www.rx7club.com/3rd-generati...usion-1090414/

I just pulled and re-tested all my existing solenoids and they appear to be good.

I ordered a brand new set of solenoids from Ray, not knowing there were potentially different solenoids. I just told him the solenoid names via e-mail, and so I received:
(2) 1480-13-240A. charge control and charge relief.
(1) N390-18-741. Turbo control.
(1) N3A1-18-741. Turbo control (Vacuum)

Upon comparing to my old solenoids that tested good, I was using a 1480-13-240A solenoid for turbo control where I should have had N390-18-741. All of my old working solenoids were the same, (1480-13-240A). If my boost issue fixed we shall see if that 3-way turbo control really is different or not. Either that or I had a bad solenoid that was testing good.
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Old 10-05-15, 10:42 AM
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did you test your good solenoids hot? I had a bunch fail hot that passed cold. Remember, they are supposed to work in a hot environment.

Also test the new ones as well. I read somewhere (maybe in this thread) that the new ones are not necessarily new and have been sitting some time and occasionally test bad.
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Old 10-05-15, 11:37 AM
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Yes, I tested them all both cold & hot.
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Old 10-06-15, 09:15 PM
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Car boost perfectly now! Either the solenoids are picky or something was testing correctly but didn't work when it counted.
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Old 07-10-16, 03:21 AM
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should the turbo control actuator hold pressure and vac as shown in this diagram?
i can't get my first turbo to boost past 4.5 / 5 psi chased everything else and the vac system is fine wastegate and pre control all working and connected as should

thanks in advance


m?
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Old 07-10-16, 01:20 PM
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Yes, the actuator should. The pressure and vacuum are applied simultaneously in operation to make the actuator operate quickly and shut the TCV securely.
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Old 07-15-16, 02:42 AM
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Originally Posted by dgeesaman View Post
Yes, the actuator should. The pressure and vacuum are applied simultaneously in operation to make the actuator operate quickly and shut the TCV securely.
Thanks, checked all my vac lines and had this off the car and its not holding pressure on the side fitting so just waiting on a replacement
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