Man oh man, 6 years since I bought this thing and I FINALLY got it working 100%. The last code issues I was having are below. All related to pressure. I had checked the cable from the pressure sensor to the ECU and could not find any faults but it would intermittent drop to 0v. I ran a new cable....still occasional faults. Was finally able to view on Gap live data that the actual connector going to the pressure sensor could be wiggled just the right way to cause the voltage to drop to zero. Fixed that up and this is the first time ever I went on a hard offroad trail and had zero faults.

So just wanted to share if you are encountering issues where it sees pressure go up or down when it shouldn't, it isn't necessarily an actual pressure change, but rather the signal from the sensor to the ECU showing sudden voltage changes which it interprets as a pressure change.

Happy trails!

• C1A09-1C (28) Pressure sensor signal - General electrical failure - circuit voltage out of range
  ( on 26-02-2023 18:28:52 at 170827 mi )
• C1A11-64 (28) Pressure increases when system inactive - Algorithm based failure - signal plausibility failure
  ( on 26-02-2023 18:28:52 at 170827 mi )
• C1A20-64 (AF) Pressure increases too slow when filling reservoir - Algorithm based failure - signal plausibility failure
  ( on 24-06-2023 07:01:18 at 170837 mi )

 

Hi Ricky,

I appreciate it has been a while since your post but I was hoping you could help me. I have been having the fault code:

C1A09-1C

This is an intermittent issue and doesn't always throw a suspension inactive fault. However, just by nudging the connector on the pressure sensor, the suspension inactive fault was immediately thrown, leading me to believe it is the connector itself as you had in your case. Would you be able to provide some detail on how you fixed this issue? Did you rewire the connector or was there a replacement part that you identified (I haven't been able to find the correct connector online).

Any help would be greatly appreciated.

Kind regards,
JonoRangeRover

 

Hi there JonoRangeRover,

Definitely sounds like you found the same problem. I have not yet replaced the connector as, like you, I cannot find a replacement online anywhere. Do you have a GAP tool or other advanced scanner? If you want to definitely confirm the issue, look at pressure sensor voltage (should be about 5VDC) and gallery pressure reading, should be 30-250psi. Have it record/datalog or watch it live and wiggle that connector. If it was like mine, you will see voltage drop to almost 0VDC and pressure will drop to a low constant PSI (if I recall, like 14psi). Basically, this means the 5VDC or ground to the sensor is shorted and thus your code.

What I did that worked was used some electrical contact cleaner (https://a.co/d/gUSj6aX), then I used some circuit paint (https://a.co/d/1Cy3qdy) to fill the little female pin receptacles. Finally, I found that the connector itself is really hard to snap on fully, I had to use pliers and really pinch mine on before I got the click. I then added a zip tie to make double sure it would stay nice and tight. If you end up needing a new connector, your best bet might be a self service wrecking yard. Not sure if those are all over the place but here we have yards you can go get what you want. Just cut off a connector from a Rover and it would probably be $5.

Good luck!

 

THis SOUND EXACTLY like what Im having; but how did you have a gap tool and did you see volktage droppiung to 0 on the sensor? And here were talking the three prong sensor on the EAS compressor valve correct? 09 L 322. None of the other faults though, its like a bump sets its off and then the exhaust hits and then other times reservoir is at 35 lbs rather than 200. How did you test the senosr; ohms?

Dave

Dave

 

Hi Dave,

With your Gap tool connected, you would want to go to Live Values>Suspension>Gallery Pressure. From there you can record or just watch the values live. The connector in question isn't on the compressor but just forward of it on the central pressure junction. It has a small pressure sensor along with air lines attached to it. The pressure sensor has a small electrical connector on it. That's where my issue was. If I was to wiggle the wires or connector, I could see the live value voltage drop to zero or near zero which is not correct. Or maybe I saw the pressure (cannot recall which value is displayed). But if pressure is dropping to like 10psi or under...it shouldn't actually be that low but rather the pressure sensor voltage dropping signaling low pressure. If you observe similar drops on that value when you jiggle....you may have found the problem.

Cheers!