T56 Reverse Lockout Wiring - LS1TECH - Camaro and Firebird Forum Discussion

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T56 Reverse Lockout Wiring

 
Old 11-01-2016, 09:26 PM
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Default T56 Reverse Lockout Wiring

Quick question, I couldn't find a straight answer in the search.

Does the polarization matter for the lockout solenoid? I thought I read somewhere that it didn't, but the way I understand solenoids it should matter.

In any case, I've confirmed that I am getting 12V measured between the leads. I re-pinned the PCM to supply the ground. I just want to make sure it isn't backwards on the solenoid before I try to replace the solenoid itself.
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Old 11-10-2016, 10:34 PM
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I don't believe that it matters.

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Old 11-11-2016, 09:44 AM
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Copy, I guess the solenoid is stuck or failed then. Damnit.
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Old 11-11-2016, 09:49 AM
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Have you taken it off for testing? I've had mine on the bench and when energized you can hear it click. If it's not clicking, it's probably done.

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Old 11-15-2016, 02:27 PM
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If you unplug it does it block you from reverse? It's a "crash through" gate so you can force the shifter through it, but it shouldn't just be "open" to reverse if it's unplugged and working properly. In most of the 3rd gen swaps I've done I've just skipped the solenoid and used the crash through gate to get into reverse. (I had a car where they put a brake switch on to unlock it and when you step on the brakes on the freeway and downshift from 6th it would find its way into reverse at times so I scrapped that).
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Old 11-16-2016, 08:44 AM
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Originally Posted by Project GatTagO View Post
Have you taken it off for testing? I've had mine on the bench and when energized you can hear it click. If it's not clicking, it's probably done.

Andrew
No, the guy I bought the trans from said everything worked fine. Hindsight being 20/20 I should've checked this. The Trans was a PITA to put in and I don't think I can pull the solenoid while the trans is in the car.

However, I think you're right. There is no audible click when I just power the car on without starting the engine.

Originally Posted by trackbird View Post
If you unplug it does it block you from reverse? It's a "crash through" gate so you can force the shifter through it, but it shouldn't just be "open" to reverse if it's unplugged and working properly. In most of the 3rd gen swaps I've done I've just skipped the solenoid and used the crash through gate to get into reverse. (I had a car where they put a brake switch on to unlock it and when you step on the brakes on the freeway and downshift from 6th it would find its way into reverse at times so I scrapped that).
Yep, plugged in or not I have to jam it really hard to get it into reverse. It's not a huge deal yet since I just finished this swap/build and am still working the kinks out, but it would be nice not to have to fight it every time I need to back into the garage.
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Old 11-17-2016, 02:05 PM
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assuming the reverse lock out solenoid is getting signal from PCM and does not work...than solenoid is bad. This assumes though the wiring and PCM program are right for reverse lock out

I did a T56 swap in B-body and just wired the lockout to the brake pedal switch...and have never found myself in a 6 to 5 downshift buzzing reverse if my foot was on brake pedal at same time.
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Old 11-18-2016, 05:18 AM
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Attached Thumbnails T56 Reverse Lockout Wiring-1.gif  
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Old 11-18-2016, 08:48 AM
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Im curious why you say that polarity of a solenoid should matter. It's just a electromagnet coil, right? flipping polarity would change the North & South poles of the magnetic field, but in this case it just needs to be magnetic to pull the plunger in.
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Old 11-20-2016, 11:10 AM
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Maybe unplug the connector and run some wires into the cabin with a test light to verify the car side wiring first
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Old 11-22-2016, 01:53 PM
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Originally Posted by Jontall View Post
Schematic
Interesting, I'll double check which terminal is getting power/ground on the solenoid.

Originally Posted by samckitt View Post
Im curious why you say that polarity of a solenoid should matter. It's just a electromagnet coil, right? flipping polarity would change the North & South poles of the magnetic field, but in this case it just needs to be magnetic to pull the plunger in.
Because wouldn't flipping the polarity change the direction of the force exerted on the plunger? I'm not exactly sure how the system inside the transmission is working to achieve the lockout. That's why I was asking.

Originally Posted by Nathaninwa View Post
Maybe unplug the connector and run some wires into the cabin with a test light to verify the car side wiring first
Not a bad idea, I used a DMM while I was under there and got 12 V, but this would let me test without getting under there.

I won't be able to get back to it for another week unfortunately.
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