AM-PC-1 Cruise Control tester

[Gojira94]

4 minutes ago, 87MJTIM said:

This thread discuss CC diagnosis 

 

Thanks!

 

I've already determined everything from switch to 'Speed Control Regulator' connector is good. Haven't tested the servo or regulator themselves yet.

[eaglescout526]

I think I had a servo fail me once. 
everything else was typically vacuum. 

[Gojira94]

 

 

 

1) key on with cruise switch in 'off' position (lamp 4 on only)

2) cruise switch in 'on' position (lamps 2, 3, 4 on)

3) brake pedal pressed (lamps 2, 3 off, lamp 4 remains on)

4) brake pedal released (lamps 2, 3, 4 on)

5) 'resume/accel' button pressed and released (lamps 2, 3, 4, 5, 6 on, then back to 2, 3, 4 only)

6) 'set' button pressed and released (lamps 1, 2, 3, 4 on, then back to 2, 3, 4 only)

7) cruise switch from 'on' to 'off' and 'on' again (lamps 2, 3 go out and back on again, lamp 4 remains on)

8) brake pedal pressed (lamps 2, 3 off, lamp 4 remains on)

9) 'set' button pressed and released (lamps 1, 2, 3, 4 on, then back to 2, 3, 4 only)

10) 'resume/accel' button pressed and released (lamps 2, 3, 4, 5, 6 on, then back to 2, 3, 4 only)

 

[Gojira94]

In my video, lamp 4 should not be on at KOEO, and 2 should not go out when the brake pedal is pressed. My issue was I'd wired the GM brake switch incorrectly. I'd bridged the hots for both pairs of pins, switching the ground between brake and cruise. I misread the electrical manual diagram thinking I needed to cut power to the cruise system when brake was applied. Kind of embarrassing I expected this to work lol. Epiphany came when I finally dug out the brake switch that came from the donor vehicle and I dope slapped myself. Meanwhile I'd already enjoyed testing and fiddling with the servo internals.

 

The throttle position feedback input is adjustable. Before adjustment it read 670 ohms at throttle closed and max of 3780. I set it to the middle of the prescribed range of 280-430 ohms at throttle closed.

 

 

The charge and vent valves/ solenoids can be tested with a 12V source (lawn tractor battery for me) and a bit of vacuum hose to check flow. I was happy to find both work perfectly and don't leak.

 

 

 

 

Edited Monday at 05:29 PM by Gojira94
typo

[Gojira94]

I found this pdf guide for Dana cruise equipped motor homes. I think it refers the slightly older purple regulators but they work the same aside from a wire you cut for manual trans applications. A good read and goes into more detail than the 88 electrical manual pdf I have a copy of.

 

DANA CRUISE CONTROL TROUBLE SHOOTING GUIDE.pdf

[MJPIA]

I have a, well I don't know what I have

 

My best guess is this was a tool Dana service depots would use to test, repair and then recalibrate any malfunctioning voodoo control boxes that was sent back to them.

It does all variants of the speedostat analog control boxes which everyone used and the mid 80s supercruise/supercruise plus which were self contained units pictured in the top right I can also find jack all about.

It was made in the later half of 84.

 

I can't find anything about it, I can't find pictures of any others, documentation, nothing.

None of my Jeep service manuals mention it.

I've been cruising the internet and found nothing, has anyone seen one of these before?

 

I don't know where to put this, I don't know where to start or ask to find anything about it.

[Gojira94]

"Beavis, this is the coolest thing I have ever seen..."

[Pete M]

[eaglescout526]

3 hours ago, MJPIA said:

I have a, well I don't know what I have

 

My best guess is this was a tool Dana service depots would use to test, repair and then recalibrate any malfunctioning voodoo control boxes that was sent back to them.

It does all variants of the speedostat analog control boxes which everyone used and the mid 80s supercruise/supercruise plus which were self contained units pictured in the top right I can also find jack all about.

It was made in the later half of 84.

 

I can't find anything about it, I can't find pictures of any others, documentation, nothing.

None of my Jeep service manuals mention it.

I've been cruising the internet and found nothing, has anyone seen one of these before?

 

I don't know where to put this, I don't know where to start or ask to find anything about it.

Thats really neat. I swear I had seen or heard of something like this somewhere during my research of the Dana cruise control system.