Autoride suspension help

[Rocket Man]

After thinking about this more I don’t understand why I can’t clear that C0696 code if all the sensors are reading back ok temporarily. The four position sensors and the pressure sensor are what feeds that and on my last screen shot you can see them all reading within range. I still suspect that pressure sensor.

I keep finding that fault code means position sensor over current but that TSB is talking about it being a pressure sensor short to ground. In my googling I did come across this thread here on the forum and he says it was his suspension control module however he was having a shop do the work so it’s second hand information. https://www.tahoeyukonforum.com/threads/intermittent-service-suspension-c0696-code.68607/

 

[George B]

I keep finding that fault code means position sensor over current but that TSB is talking about it being a pressure sensor short to ground. In my googling I did come across this thread here on the forum and he says it was his suspension control module however he was having a shop do the work so it’s second hand information. https://www.tahoeyukonforum.com/threads/intermittent-service-suspension-c0696-code.68607/

Thanks.
Yes I saw that one too. I noted his suspension sensors were reading really low. Mine are reading about mid scale and change as I change the vehicle position but I don't know if that means they are ok.

I did find this which includes the compressor pressure sensor in the diagnostic procedure as one of the suspect parts.

I was messing with it again this morning and it didn't seem like the vent valve was working correctly. I command it on and the pressure doesn't drop like I think it should. Seems like it sticks around 22 psi unless I go and pull one of the lines off the shocks then the rest of the air comes out and it settles to about 3 psi. I did remote start and then get in and insert the key and drive away. It didn't run the pump test and when I arrived at work the system was at 0 psi. cycling the ignition resulted in a test run and about 14 psi pressure.

 

[George B]

It would be nice if someone with a properly operating system could take their tech2 and compare position sensor range, pressure and relief valve operation.

 

[Doubeleive]

It would be nice if someone with a properly operating system could take their tech2 and compare position sensor range, pressure and relief valve operation.

when I was testing mine I could see the pressure reading showing all kinds of stupid numbers as it was inflating anywhere from 0~180psi when it would only run for a few seconds, just not possible for it to have 180 psi in the same amount of time it takes to make 20-25 psi, and it would also do the same thing that you just posted it would sometimes inflate low like 14 psi.
I wouldn't worry about the height sensors, the pump is bad and that c0895 code you showed is a low voltage 9v which probably means it is shorting out, I would replace the pump.
when I replaced mine it read properly it would go right up to 20-25psi and hold, if I cycled it again real quick it would build a little more maybe 30-35. those pumps are made for intermittent operation only that's why they cut off even if the air line was disconnected. I can hook mine up later today and make a video of it or something, gotta go do some work in a little bit

 

[George B]

when I was testing mine I could see the pressure reading showing all kinds of stupid numbers as it was inflating anywhere from 0~180psi when it would only run for a few seconds, just not possible for it to have 180 psi in the same amount of time it takes to make 20-25 psi, and it would also do the same thing that you just posted it would sometimes inflate low like 14 psi.
I wouldn't worry about the height sensors, the pump is bad and that c0895 code you showed is a low voltage 9v which probably means it is shorting out, I would replace the pump.
when I replaced mine it read properly it would go right up to 20-25psi and hold, if I cycled it again real quick it would build a little more maybe 30-35. those pumps are made for intermittent operation only that's why they cut off even if the air line was disconnected. I can hook mine up later today and make a video of it or something, gotta go do some work in a little bit

Thanks.
The C0895 was in there when I went in to check at first and I believe it may be related to the voltage drop I was chasing when the Stabilitrac actuates. that one cleared and has not returned. the C0696 is still present and will not clear. I can try with my tech2 and it just causes the service suspension message to show on the dic. that message is not showing while driving without the scanner attached. it only shows when I try to clear the code.

 

[Doubeleive]

Thanks.
The C0895 was in there when I went in to check at first and I believe it may be related to the voltage drop I was chasing when the Stabilitrac actuates. that one cleared and has not returned. the C0696 is still present and will not clear. I can try with my tech2 and it just causes the service suspension message to show on the dic. that message is not showing while driving without the scanner attached. it only shows when I try to clear the code.

ok so take a multi meter and check each of the 4 sensor connectors.
check each one and note the ohms and voltage on the harness to the body and then check the ohms on the sensor side.
after you check each one, note if one is different or not and go from there.
the voltage should be 5v, not sure what the ohms should be but they should all read approx the same.

 

[George B]

when I was testing mine I could see the pressure reading showing all kinds of stupid numbers as it was inflating anywhere from 0~180psi when it would only run for a few seconds, just not possible for it to have 180 psi in the same amount of time it takes to make 20-25 psi, and it would also do the same thing that you just posted it would sometimes inflate low like 14 psi.
I wouldn't worry about the height sensors, the pump is bad and that c0895 code you showed is a low voltage 9v which probably means it is shorting out, I would replace the pump.
when I replaced mine it read properly it would go right up to 20-25psi and hold, if I cycled it again real quick it would build a little more maybe 30-35. those pumps are made for intermittent operation only that's why they cut off even if the air line was disconnected. I can hook mine up later today and make a video of it or something, gotta go do some work in a little bit

Next question is which pump. Arnott or Dorman?

 

[Doubeleive]

Next question is which pump. Arnott or Dorman?

well either should be fine...but I had to replace the arnott twice and then went with the Dorman and it has been fine.
could have just been bad luck. I only went with aftermarket because of lifetime warranty, oem should be fine as well.

 

[Doubeleive]

if one of the height sensors is bad it should show a different ohm reading than the other 3 or have a open circuit.

 

[Doubeleive]

I would think it should be able to tell you which one is bad like it can with the shocks but apparently not.

 

[Doubeleive]

the tsb say's that it could be the sensor in the pump, this just confirms the pump is bad if you ask me
DTC C0696 and/or C0711 set. This condition could be caused by the wiring to the automatic level control (ALC) pressure sensor being shorted to ground at the locations shown.

 

[George B]

well either should be fine...but I had to replace the arnott twice and then went with the Dorman and it has been fine.
could have just been bad luck. I only went with aftermarket because of lifetime warranty, oem should be fine as well.

if one of the height sensors is bad it should show a different ohm reading than the other 3 or have a open circuit.

I would think it should be able to tell you which one is bad like it can with the shocks but apparently not.

The odd thing is that I can see the live data and they all seem to give good readings. I would think one would show up with a different reading. I will test for the reference voltage when I get a chance.

Wish I had a wiring diagram.

 

[wsteele]

It would be nice if someone with a properly operating system could take their tech2 and compare position sensor range, pressure and relief valve operation.

Hopefully this will have all been put to bed by the time I get my Tech 2, but if not, as soon as it arrives, I will be glad to check it out.

 

[Doubeleive]

The odd thing is that I can see the live data and they all seem to give good readings. I would think one would show up with a different reading. I will test for the reference voltage when I get a chance.

Wish I had a wiring diagram.

after reading the tsb I would suspect the pump given the erratic data it is giving, the tsb says to replace the valve on it, not sure if you can get them anymore, probably easier to just replace it.

 

[Rocket Man]

FWIW I’ve been running Arnotts pump on my 02 for 3 years with no issues.

 

[George B]

Update:
Went out at lunch and was able to clear the code and it stayed clear. I still suspect the pressure sensor and that it freaked during the the ALC trim procedure.

Currently I can command the pump on and pump up to 80 psi and it drops quickly down to about 35 psi and then when I command the vent open it goes down to 22 psi and won't go lower. I agree that it sounds like the pump or valve died.

 

[George B]

Update:
Went out at lunch and was able to clear the code and it stayed clear. I still suspect the pressure sensor and that it freaked during the the ALC trim procedure.

Currently I can command the pump on and pump up to 80 psi and it drops quickly down to about 35 psi and then when I command the vent open it goes down to 22 psi and won't go lower. I agree that it sounds like the pump or valve died.

Assuming something with the pump is bad and that I have leaks starting on the shocks do I just replace the whole batch at the same time???

 

[gooffeyguy]

It should get lower with the valve open, like below 10psi

Sent from my SM-G930V using Tapatalk

 

[George B]

It should get lower with the valve open, like below 10psi

Sent from my SM-G930V using Tapatalk

It’s odd because When the bags are flat it pumps it up to about 14psi and I can open the valve and it will drop to ~5psi. But, if I pump it up above 50psi it won’t go lower than 22 psi unless I pull the hoses off the shocks. Then It goes down to 3psi. I don’t think those pressures are correct and I think the sender is bad. I wish I had another one to screw into it for giggles.

 

[Rocket Man]

Assuming something with the pump is bad and that I have leaks starting on the shocks do I just replace the whole batch at the same time???

If your shocks are leaking then I definitely would, otherwise they’ll soon be leaking worse and might take out the new compressor.