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[Z06] How does reverse lockout solenoid work?

 
Old 07-06-2019, 10:50 AM
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db2xpert
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Default How does reverse lockout solenoid work?

Still having huge problem getting tranny into reverse.
Same with engine running, or engine off.
When the problem first started, I could put it into reverse easily with the engine off.

I have a new solenoid to install - hoping this is the problem.

The new solenoid - the plunger is fully extended when power is not applied.
Pushes in easily with my finger.
Applying 12V to it retracts the plunger

I haven't taken the mounting assembly off yet, as I will have to lower the cradle a bit to get in there. Tried as it is, and can't quite get onto the 13mm bolt.
I know others have been able to do theirs without lowering, but I can't quite get enough room.

How does the lockout assembly work?
Is the (12V applied) plunger retracted mode the lockout position?

What goes on in the housing when reverse is locked out?

I'm hoping my problem is that the plunger is sticking in the lockout position.

Thanks
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Old 07-06-2019, 02:03 PM
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Apocolipse
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Needs 12v sent to retract it and allow you to go into reverse. This way if a wire or plug get disconnected it wont let you go into reverse.
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Old 07-06-2019, 05:20 PM
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Originally Posted by Apocolipse View Post
Needs 12v sent to retract it and allow you to go into reverse. This way if a wire or plug get disconnected it wont let you go into reverse.
Looking for what's happening inside the piece that bolts to the tranny.
Expecting some type of lever action -- but the piston only needs a very minimal pressure to push in as it's sitting on my bench.

Not disputing what you said -- but I have always been able to shift it into reverse with the ignition off.
If it requires 12V and the piston to be retracted, it seems like I should not have been able to shift it into reverse with the ignition off...????
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Old 07-07-2019, 01:25 PM
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f
Found this picture of the mechanism.
Based on this, the solenoid piston has to be retracted so the other piston can slide into the area the solenoid piston occupies when not retracted.

Since I have shifted into reverse sometimes with the ignition off, implies the solenoid may be sticking in the retracted position (sometimes).
But I could not put it into reverse with the engine running, so solenoid piston not retracted.

So I will replace the old solenoid.
I will have to check the power to the solenoid and hope it's not a problem with the wiring or connector
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Old 07-07-2019, 06:46 PM
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03BlkZ
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Before you replace anything check this micro fuse. Something similar happened to me after and exhaust swap and it was this fuse was blown. It's kind of hard to see but it is circled in blue. Quick and easy check before spending time to replace the solenoid.
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Old 07-07-2019, 09:59 PM
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Wow, I never even thought to look for a fuse.
I should be back to the garage later in the week and will check this.
That would really be a stroke of luck.

Thanks !!
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Old 07-07-2019, 10:35 PM
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Originally Posted by db2xpert View Post
Wow, I never even thought to look for a fuse.
I should be back to the garage later in the week and will check this.
That would really be a stroke of luck.

Thanks !!
I hope that's all it is for you also. Quick easy and cheap for just a 25 amp micro fuse. Good luck!
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Old 07-10-2019, 01:39 AM
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Unfortunately the fuse is good.
Checked with a continuity tester.

So it will be drop the cradle a bit so I can get the solenoid out.
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Old 07-10-2019, 09:37 AM
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AzDave47
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Good luck, Joel.
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Old 07-16-2019, 01:20 AM
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No joy in muddville….

We got the whole assembly out.
Shifts into reverse with everything out.
A bit notchy, and

Old solenoid tested good, and put in the new one anyway.

Tested power getting to solenoid when ignition turns on, and retracts when power is turned off.
That part works properly.
The other part of the assembly seemed to work easily with the plunger moving out and in.
With solenoid installed on workbench would not depress, as expected.

Re-installed assembly with new solenoid.

FUBAR - can't get into reverse with power on, and engine not running
Can't get in with engine running.

The thing I now realize we didn't check, was the plunger going into the assembly with power applied to the solenoid, so that plunger is retracted..

Have to pull it out again and check that.

Could take the guts out of the assembly, and not have a reverse lockout.

Maybe something is bent in the tranny - but then shouldn't have worked with the whole assembly out.

Prefer not to go for a tranny rebuild yet.....

.
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Old 07-16-2019, 01:28 AM
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hmm super weird. Curious to what you find
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