WH CRD Strange Problem

[Clarky]

There are 3 sensor monitors around the Jeep, one for each of the front wheels located behind the plastic inner guards and one in the rear located around the rear diff centre up near the spare from memory. If you rotate the tyres and the fault remains at the same wheel then the sensor receiver is probably the culprit.
Codes C1501,C1502,C1503,C1504 are all TPMS codes the last number indicates which tyre.

Not having a go about your choice of tyre pressures, I have found that closer to the factory recommendations no mater the tyre size works for me.
My van (Jayco) was similar weight and duel axle pop top and it sat nice and tight behind me but I had Old Man Emu medium springs in the rear so maybe that's the difference.

My placard says 33psi, I have run 265/70 and currently run 255/75's. I ran 33psi in the 265's (10 ply LT) and they wore even, went to 38psi in the rear when towing the van, switched the display to USA so I could monitor in psi and found only a 4 psi increase in pressure when hot so I was happy with that.

Now my current KO2's are 255's (7 ply LT) and have found 35psi is a good pressure for them. Recently on the Oodnadatta Track I ended up dropping to 20psi to smooth out the corrugations and to roll over some of the cricket ball size rocks that lay all over the track.

In all there are so many variables like tyre construction, tyre brand and vehicle weight that one size does not fit all when it comes to pressures.

[mikelaw]

Ok, a bit more info to take in, which is tyre1,2,3,4, like left front, right front or what so I can pinpoint the culprit, it came with a 110 litre extra tank where the spare was so the rear sensor is up under it I bet & may have been damaged.
I'll experiment with some pressures but when I had 42 in the rear I didnt like the feel of it & the pressure increased by 8 psi so took them up & they now increase by 5 psi, which I'm happy with, they are J-Trax from Bob Jane that were on it when I got it & a 2" OME lift, like you said they are probably a different animal altogether, I weigh 2.72 in my car when I'm full of fuel & 60 litres of water plus Tools & all the other junk you carry, so I'm up there a bit but dont always use the spare tank unless I spot cheap fuel. I think my rear springs are not right, they are probably too soft, there was a couple of those round rubber blocks that go under your springs in the back with other bits & pieces when I got it. Air bags in my last car , a Kia Sorento took the softness out of it so thats a thought.

Mike

[Clarky]

C1501 - Tire Pressure Sensor 1 (L.F.)
C1502 - Tire Pressure Sensor 2 (R.F.)
C1503 - Tire Pressure Sensor 3 (R.R.)
C1504 - Tire Pressure Sensor 4 (L.R.)

I made a mistake in my earlier post, C1504 is the Left Rear (not right front)



www.xkjeeps.com/TSB/tsb_xk_2200206.pdf

[mikelaw]

Thanks for that Clarky, I'll grab a sensor for left rear.