Confusion with AHC sensor orientation

[AtinLango]

For my rear AHC sensor, if i loosen linkage at the slider, then slide linkage up (engine running), the rear rises. When i slide it down, the rear drops.

For front, when i do a similar action, nothing seems to happen In response. However voltage increases as i slide down (sensor arm rotates down), and reduces as i slide up.

The AHC system otherwise works fine without any issues.

Two questions:
1. Is rear behavior normal? All along I thought it is ok like that, but i am now having second thoughts.
2. Could the front sensors be dead? Note that AHC height raise and lowering, and even self-levelling work fine for both front and rear..

 

[OEMGUY0720]

Two questions:
1. Is rear behavior normal? All along I thought it is ok like that, but i am now having second thoughts.

Yes that’s normal behavior of the rear when you move the position of the sensor up or down.

2. Could the front sensors be dead? Note that AHC height raise and lowering, and even self-levelling work fine for both front and rear..

Sensor could be shot or wire is cut/grounded. How’s the rust condition on the truck or the front height sensor? The front has 2 height sensors- passenger and driver side, when you did your troubleshooting did you run it on both?

 

[AtinLango]

Yes that’s normal behavior of the rear when you move the position of the sensor up or down.

Sensor could be shot or wire is cut/grounded. How’s the rust condition on the truck or the front height sensor? The front has 2 height sensors- passenger and driver side, when you did your troubleshooting did you run it on both?

Sensor could be shot or wire is cut/grounded. How’s the rust condition on the truck or the front height sensor? The front has 2 height sensors- passenger and driver side, when you did your troubleshooting did you run it on both?

Yes, both sides behave the same.

Now, if wire was cut or grounded, would AHC still behave normally otherwise?

 

[OEMGUY0720]

Could be a case of intermittent connection, can’t discount that. How about on the mechanical side of the ahc system, fluid levels, leaks or accumulators?

 

[AtinLango]

Could be a case of intermittent connection, can’t discount that. How about on the mechanical side of the ahc system, fluid levels, leaks or accumulators?

Mechanical side seems ok according to my assessment.

And also there is no rust this side.

 

[AtinLango]

Sorry for sounding too trivial here. Its really confusing. Please forgive the naivety.

For the front, if i want to increase height, should i rotate sensor arm up or down?

 

[hoser]

To increase front height, reduce the adjustable arm length.

 

[Aracobuilt]

Keep in mind that the vehicle needs to have a slight rake. This is from the factory. If the front is level with the rear it will affect handling. You definitely don't want to go overboard with the adjustment.

 

[AtinLango]

To increase front height, reduce the adjustable arm length.

Or alternatively slide the sensor linkage up the suspension arm.

This has been obvious to me all along, until it refused to obey my orders since about two weeks ago.

But finally, it worked today. Front hub to fender is now 19.5 inches. It was just a little lower and uncomfortable before. The drive is now more solid.

Thank you!

 

[AtinLango]

Keep in mind that the vehicle needs to have a slight rake. This is from the factory. If the front is level with the rear it will affect handling. You definitely don't want to go overboard with the adjustment.

Yes i am aware of rake. When it is off, the car becomes undriveable. I know it pretty well.

 

[2001LC]

Make sure pressures (Mpa) are within spec. To high of Mpa, blows out globes and shock seals.