Following on from my broken sensor post, I have now replaced the sensor linkage, not the entire height sensor but I am still having issues, I suspect it could be out of calibration but hopefully someone with more knowledge of AHC systems than me may have some suggestions?
I can get the AHC pump to run, but only after starting the car, and on the first press of a height selection. For example, starting in "N" and pressing the up or down arrow, the pump will run and the height will raise or lower but it doesn't complete the selection, it'll get to where it wants but the arrow never goes solid and disappears, now not responding to any button press until I restart again, and regardless of whether the truck is High or Low, it displays the "N" symbol and both arrows. The heights of each wheel seem to be out of wack as they are quite different in H setting. To get the truck back to as close to Normal height as possible I have to drive it so it automatically adjusts the height.
After replacing the sensor arm, I connected the truck to Techstream and it had 2 stored DTC's one for the rear right height sensor (which I expected) but also one for the front Left hand sensor. On querying the codes, Techstream reported that there were no faults now, so I cleared the codes. They have not returned and I have not seen any further check 4 wheel AHC warnings (this only happened once the evening the arm snapped, when going round a bend, driving home).
I have measured the wheel arch clearance from the centre of the arch (perpendicular) to the hub centre and have the following:-
Normal Height Setting
Front Right - 490mm
Front Left - 480mm
Rear Right - 480mm
Rear Left - 485mm
High Height Setting
Front Right - 515mm
Front Left - 560mm
Rear Right - 545mm
Rear Left - 610mm
I have checked all the lines and have no leaks, my fluid level was low in the reservoir, I have topped it up since this happened and not seen any loss since. I also wonder if I have trappped air in the hydraulics somewhere as the tank was low, but I'm a bit nervous about bleeding the system while unable to raise and lower height easily, or correctly.
I can get the AHC pump to run, but only after starting the car, and on the first press of a height selection. For example, starting in "N" and pressing the up or down arrow, the pump will run and the height will raise or lower but it doesn't complete the selection, it'll get to where it wants but the arrow never goes solid and disappears, now not responding to any button press until I restart again, and regardless of whether the truck is High or Low, it displays the "N" symbol and both arrows. The heights of each wheel seem to be out of wack as they are quite different in H setting. To get the truck back to as close to Normal height as possible I have to drive it so it automatically adjusts the height.
After replacing the sensor arm, I connected the truck to Techstream and it had 2 stored DTC's one for the rear right height sensor (which I expected) but also one for the front Left hand sensor. On querying the codes, Techstream reported that there were no faults now, so I cleared the codes. They have not returned and I have not seen any further check 4 wheel AHC warnings (this only happened once the evening the arm snapped, when going round a bend, driving home).
I have measured the wheel arch clearance from the centre of the arch (perpendicular) to the hub centre and have the following:-
Normal Height Setting
Front Right - 490mm
Front Left - 480mm
Rear Right - 480mm
Rear Left - 485mm
High Height Setting
Front Right - 515mm
Front Left - 560mm
Rear Right - 545mm
Rear Left - 610mm
I have checked all the lines and have no leaks, my fluid level was low in the reservoir, I have topped it up since this happened and not seen any loss since. I also wonder if I have trappped air in the hydraulics somewhere as the tank was low, but I'm a bit nervous about bleeding the system while unable to raise and lower height easily, or correctly.
