P38A EAS diagnosis

Having done the bags and shocks I thought I would proceed with installing the refurbished valve block and compressor. All went well considering, the new valve block performs fine. One thing I have though is height issues. Measuring from centre of the hub at standard height I have 17” pretty well bang on on LH & RH front the rear however is 17” LH and 18 1/2” RH
This differential remains for wading and motorway. I have read the heights with EASUnlock calibrate and they are all quite close and don’t really relate to the difference. However, the read heights tab shows this, not actually sure what that bit does.

From what the late Wammers used to say your bit count for the heights should bee within two bits, so some of those need adjusting.

I started from scratch on mine, found the average for each height and set all 4 corners to the same value. Once it finished leveling, then measured and adjusted, but as said, keep the values within 2 bits

brianp38dse said:

From what the late Wammers used to say your bit count for the heights should bee within two bits, so some of those need adjusting.

Click to expand...

I used blocks and then averaged across each axle. A couple of bits doesn't make much difference.

EAS System Info Doc says this :

1) After all doors are closed, system levelling could take place if any height sensors actual value differs from its target value by
more than ± 2 bits.

And:

2) When the transmission is moved out of Park, the system will request Standard ride height.
The ride height lamp will flash during this process. The compressor operation will be stopped
if the vehicle exceeds 1 mph to allow the front axle to level. The leveling operation opens
both front corner valves for only three seconds to allow pressures to equalize between the
front air springs. This will be repeated every time the vehicle speed drops to zero. In stopand-
go traffic a lot of extra valve activity may be heard.

Hence why Wammers said that Left-Right difference greater than 2 bits will cause frequent levelling adjustments. It generally shows as the front "dancing" at traffic lights. If the calibration is wrong these two actions fight each other, because the L-R equalisation (2) evens the pressure, which due to calibration difference causes >> 2 bit error, so action (1) kicks in again !!