SlayNeo Posted June 26 Share Posted June 26 Greetings, everyone - Require assistance in identifying and resolving the problems with my 2011 TDv6 L320. Recently, I have been experiencing recurring air suspension failures for the last several months. I had sporadic occurrences of an orange suspension fault. If the speed exceeds 65 kilometres per hour for more than 20 seconds, the vehicle enters a red suspension fault mode and lowers to the bump stops. I had sporadic problems with the back right height sensor, so I replaced it using real-time data and the Thingdiag tool. Additionally, I replaced the front right height sensor due to observed sporadic malfunctions with this particular sensor. I have also thoroughly cleaned both the front and rear valve blocks, which were somewhat soiled but in satisfactory condition. Indications - as already said I am seeing sporadic orange suspension faults while driving at speeds over 65km/h for more than 20 seconds. I am experiencing a red suspension fault that causes the car to lower to the bump stops. When I attempt to activate the access height mode, the car lowers and then quickly switches to extended height mode. I have been trying to perform a height calibration using the thinkdiag tool, but I have been unable to successfully complete this process (measuring heights from the centre of the hubcap to the wheel arch). I have reason to believe that the measures exceed the permitted range, however I am uncertain. Specifically, the front left and front right measurements are 436mm and 435mm respectively, while the rear measurements are 483mm and 473mm. I have captured a real-time screen recording of the voltage readings from each height sensor. Below, you can see - From 0 to 10 seconds on the graph, the automobile is initially positioned at its standard height. The readings are without variation or fluctuation. I plotted a graph for a duration of 10 to 15 seconds, after which I switched the automobile into access mode. The voltage of the front left and rear left increases, while the voltage of the rear right and front right decreases. This is likely the problem. The polarity of the voltages on one side is reversed as the automobile changes its elevation. The graph shows a duration of 15-20 seconds. After a short period of time, the go car transitions into extended height mode. During this transition, the voltages seen are opposite to the initial voltages observed when the vehicle entered access height mode. The graph shows a duration of 25-50 seconds, followed by a period of no change in height when the automobile is in its typical height mode. At the 50-70 second mark, the car is switched to off-road height mode. Graph for a duration of 70-90 seconds, during which the car is switched to its standard height mode. Link to comment Share on other sites More sharing options...
SlayNeo Posted June 26 Author Share Posted June 26 It is evident that the voltages on one side are exhibiting an opposite direction compared to the other side. Based on the content of this video Link to comment Share on other sites More sharing options...
Notef Posted June 26 Share Posted June 26 Upon acquiring my vehicle a few years back, I encountered a particular problem: When attempting to activate the access height mode in the automobile, it will first lower and then quickly transition into the extended height option. I had to repair the rear struts because oil had leaked out of them and into the air bags. This leakage was causing the vehicle to not drop to the desired height, and the sensor was detecting an error, mistakenly believing that the truck was stuck on a rock. If the whole system is depressurized, will it fully compress to the bump stops on the rear? Link to comment Share on other sites More sharing options...
SlayNeo Posted June 26 Author Share Posted June 26 Deflate functions effectively until it reaches the bump stops. Link to comment Share on other sites More sharing options...
Jollyno Posted June 26 Share Posted June 26 Are there any error codes? That would be the first point of contact. I had comparable problems that ultimately necessitated a reconstruction of the compressor. An uncomplicated assignment. However, without any specific instructions or guidelines, you are just making uninformed guesses or attempts without any clear direction. Link to comment Share on other sites More sharing options...
SlayNeo Posted June 26 Author Share Posted June 26 The cross articulation is occurring intermittently. To the best of my knowledge, this error code is a generic kind of code. Link to comment Share on other sites More sharing options...
Jollyno Posted June 26 Share Posted June 26 I am uncertain about the meaning of your statement "I am unable to successfully complete this task." What occurs during the process of calibration? Does the issue persist if you interchange the height sensors, swapping the left one with the right one? Are they inexpensive sensors? Link to comment Share on other sites More sharing options...
SlayNeo Posted June 26 Author Share Posted June 26 I exchanged the sensors and it seems that this is the correct way for them to operate - with an inverted orientation from left to right. After eliminating any other problems with the sensors, I concluded that I only needed to complete the calibration process. I made many attempts by inputting numbers that were approximate to the expected values (but not the real measurements). The system progressed to a certain point when it raised the vehicle to off-road height, then lowered it and prompted me to measure again. I was unable to advance to the second round due to the fact that the calibration did not meet the 4mm error tolerance requirement. I made many attempts, perhaps 3-4 times, to successfully complete the task, but unfortunately, I was unable. Despite my failure in the entire height calibration, it seems that the data have been successfully recorded as I am no longer seeing any errors (orange or red) and all functions appear to be operational. Link to comment Share on other sites More sharing options...
Cincoon Posted June 26 Share Posted June 26 The discrepancy of 10mm on the back is quite unsettling. The front portions likewise seem to be situated at a lower height. Based on my recent calibration, I measured around 460mm for both the front and back. It seems that the dryer's airflow may be obstructed, indicating a need for rebuilding. If the motor is not damaged, it is advisable to repair the complete compressor. The system anticipates a reading within a tolerance of plus or minus 3mm. The discrepancy of 10mm in the back may be causing an imbalance. Additionally, if it is unable to expel air rapidly enough, it will have a malfunction. Calibrations may be somewhat temperamental. Link to comment Share on other sites More sharing options...
Jollyno Posted June 26 Share Posted June 26 As mentioned before, it is likely that your compressor is obstructed. I anticipate that the problem may reoccur in the near future since the compressor has difficulty in releasing air. Please provide us with regular updates. Link to comment Share on other sites More sharing options...
SlayNeo Posted June 26 Author Share Posted June 26 Understood. What is your reasoning for suspecting a compressor malfunction? Link to comment Share on other sites More sharing options...
Jollyno Posted June 26 Share Posted June 26 These autos are equipped with compressors that have desiccant air dryers. Over a period of 13 years, the desiccant material, in the form of granules, gradually deteriorates into a powdery substance that may impede both the intake and release of air. The symptoms you've mentioned may be attributed to this. If the error recurs, examine the brand of your compressor. Replacing the granules is a reasonably simple process. Link to comment Share on other sites More sharing options...
SlayNeo Posted June 26 Author Share Posted June 26 Understood, affirmative. I refurbished my compressor around 9 months ago. Encountered fault codes pertaining to the venting gallery. Repaired the seals and replaced the desiccant. On this occasion, I was certain that it was not the problem since I received different codes. On this occasion, I addressed both valve blocks while investigating the problem I had. I am grateful that the issue has been fixed. 🙏 Link to comment Share on other sites More sharing options...
Cincoon Posted June 26 Share Posted June 26 Did you get authentic or non-original sensors? Link to comment Share on other sites More sharing options...
SlayNeo Posted June 26 Author Share Posted June 26 Parts supplied by an expert in land-rover aftermarket products. Link to comment Share on other sites More sharing options...
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