I came across this thread whilst searching for a way to test the CATS on my 1999 XKR which has a very hard ride.
Any ideas? At this stage I am not sure if the default setting is hard or soft.
Any guidance would be appreciated.

 

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I think you're in the wrong forum. The tech is different in a 1999.

 

Hi Neville,

I have moved your post from the forum for the X350 to the forum for the X100, which is the Jaguar factory project code for your 1999 XKR. Here you will find knowledgeable owners of similar cars.

The default setting for the dampers is Firm. To change the damping to Soft under appropriate driving conditions, the Adaptive Damping Control Module (ADCM) provides a pulsed electrical signal to the solenoid valve in each shock absorber, which allows more fluid to flow within the shock's damping chamber. It sounds as though your shocks are not receiving the signal to go soft when they should. There are a number of possible causes.

For the fastest diagnosis, it would be helpful to have the car scanned for flagged diagnostic trouble codes. Suspension-related DTCs may be proprietary Jaguar Chassis (C-prefix), Body (B-prefix), or Network (U-prefix) codes, which may require special dealer-level equipment to read (most generic OBDII scanners can only read Powertrain (P) codes).

This page gives some basic checks you can do yourself. These are from the Workshop Manual for the X308 sedan, which is functionally similar to your X100 (I just happen to have the X308 manual open):



There are other checks you may be able to perform yourself beyond checking fuses, but the fastest route to a diagnosis and resolution will probably be to have the codes scanned.

Cheers,

Don

 

I resolved the hard suspension problem. It turned out to be that the wire carrying the speed information from the instrument cluster to the suspension module was earthing out somewhere along it route.
I laid a new wire and cut out the original wire and hey presto, nice soft ride again.
Hoorah! Comfy Jag.