Some time ago, the front end on my 2004 VDP started settling down in 3 or 4 nights. When I would start it, I could feel it lift and the ride was normal until it would sit for 3 or 4 more nights. About 3 weeks ago, no more lift period. So, I bought a Jaguar/Land Rover code reader which gave me only one pending fault like my plug-in $10 module. Thought it was defective and sent it back. Right after that, I checked on TOPIx to see if there were any recalls on my 2004 VDP and, sure enough, found a recall for "J004 - OBD II DEFICIENCY". Next, I fabricated two copper test modules with Schrader valves and air pressure gauges to check the front air suspension. Inflated them both to 120 PSI on a cool afternoon and left them overnight (it was a cold night). Next morning the gauges showed no drop in pressure. Checked for leaks on top of front air suspension, tank and pump outlet. Nothing. Suspected the pump might have gone bad and put on a new one that I had bought for another 2004 that I had sold. Front end doesn't move one inch when starting the car and after two or three tries I am getting a "Suspension Fault". Rear suspension appears to be about normal measuring from bottom of fender openings to center of wheels. Checked for leaks in the luggage compartment. None there. All relays are good. Stumped!

 

Start the car, move it forward and backward a bit slowly, should start up the compressor.

Could cycle a couple times till warning goes away

 

Thanks for the reply. However, the new pump does start when the engine is started and runs through 3-4 cycles before showing "Suspension Fault". The problem is the front suspension doesn't react at all. Zero lift.

 

You have checked for leaks but have you checked for pressure at the ballast tank and are all solenoids lifting etc?

Rebooting the vehicle may help too.

 

The car may have entered Jacking Mode, which disables lift until the car has been driven 2 mph.

Another possible cause is a problem with the front ride height sensor(s). You can check to confirm the sensor poke yoke is connected to the suspension and is not damaged, and that the electrical connector is clean and secure.

Air suspension codes tend to be Chassis (C-prefix) and Network (U-prefix) codes, which cannot be read by most generic OBDII scanners, which can only see the Powertrain (P-prefix) codes. So you may need to get access to a scan tool that can read the suspension codes.

BTW, the J004 recall was to revise the OBDII software related to emissions and had nothing to do with the air suspension. See the attached TSB.

Cheers,

Don

 

Thank you Don, I will now go though your suggestions. Happy New Year..