Symptom Chart

Symptom	Possible Message	Possible Causes	Action
Vehicle air suspension will not raise the vehicle when requested	Suspension fault message displayed on the Instrument Panel Cluster (IPC)	Expansion chamber air leak	Using the Jaguar Land Rover approved diagnostic equipment, check for air suspension related DTC and repair as necessary Inspect the suspension air supply unit expansion chamber for leaks. If a leak is identified, install a new expansion chamber as required. Refer to: SUSPENSION AIR SUPPLY UNIT EXPANSION CHAMBER
System detects extended mode unnecessarily when lowering	-	Crossed gallery and air spring pipes Incorrect valve block installed to front or rear Damage or blockage in air harness Faulty height sensor	Inspect the air harness, valves and air springs for blockages and/or leaks Check operation of height sensors Where possible, refer to the guided diagnostic routine on the approved diagnostic system REFER to: AIR SUSPENSION SYSTEM DEPRESSURIZE AND PRESSURIZE and RIDE HEIGHT ADJUSTMENTS
Pressure Does Not Decrease When Venting Gallery - Signal plausibility failure	C1A13-64	Signal plausibility failure Gallery pipe from rear valve block to suspension air supply unit blocked/damaged Air suspension exhaust silencer or exhaust pipe blocked/restricted Rear valve block pipes connected incorrectly Pressure sensor fault Exhaust valve stuck closed	Visually check the gallery pipes for evidence of melting, crushing, kinking or collapsing. If pipes appear sound, disconnect the pipe at both ends and check for free air flow. Repair/renew pipes as required, clear the DTC and retest Check the air suspension air supply unit exhaust silencer/exhaust pipe for blockages/restrictions. Repair as required, clear the DTC and retest Starting with the vehicle around normal height, using the Jaguar Land Rover Approved Diagnostic Equipment, open the exhaust valve. If the rear suspension height lowers quickly as soon as the exhaust valve is opened then a rear air spring pipe and the front gallery pipe are installed to the rear valve block incorrectly. Rectify as required, clear the DTC and retest To check the air pressure sensor, use the Jaguar Land Rover Approved Diagnostic Equipment to vent the common gallery through the exhaust valve. Then disconnect the 8 mm delivery pipe from the delivery port on the back of the air dryer and connect a T-piece fitting. Connect one port of the T-piece to the blue delivery port through a short length of 8 mm pipe. Connect the other port of the T-piece to a calibrated pressure gauge tool (Note that an 8 mm connector will be required). Using the Jaguar Land Rover Approved Diagnostic Equipment, run the suspension air supply unit until the pressure is in the range 1500 - 1800 Kpa. Read the system pressure using the Jaguar Land Rover Approved Diagnostic Equipment. Divide the measurement in Kpa by 100 then subtract 1 at sea level (0.9 at 900m elevation, 0.8 at 1900m elevation, or 0.7 at 3000m elevation) to convert to bar and compare the result with that displayed by the pressure gauge. If the readings are not within 2.0 bar of each other, then the pressure sensor is likely to be faulty. In the case of a faulty pressure sensor, check and install a new valve block as required. Clear the DTC and retest To check for a stuck exhaust valve, use the Jaguar Land Rover Approved Diagnostic Equipment to run the suspension air supply unit until a gallery pressure of at least 500 Kpa is reached, then switch off the suspension air supply unit and make sure all valves are closed before opening the exhaust valve and noting any changes in gallery pressure. If the gallery pressure drops quickly to between 125 Kpa and 250 Kpa at sea level (115 Kpa and 240 Kpa at 900m elevation, 105 Kpa and 230 Kpa at 1900m elevation, or 95 Kpa and 220 Kpa at 3000m elevation) then the exhaust valve is operating correctly. If the gallery pressure cannot vent quickly below 220 Kpa to 250 Kpa (elevation dependent, see above), then there is a fault with the air suspension system or its exhaust valve. Disconnect the 8 mm delivery pipe from the delivery port on the back of the air dryer. Connect a calibrated pressure gauge tool directly into the delivery port. (Note that an 8 mm connector will be required). Run the suspension air supply unit to generate 3 to 4 bar and then actuate the exhaust valve. If the pressure cannot vent quickly to between 0.25 bar and 1.5 bar then the exhaust valve is the likely cause of failure. In this case, check and install a new suspension air supply unit as required. If the pressure can vent quickly to between 0.25 bar and 1.5 bar then check for a blockage in the pipe between the compressor and the rear valve block, and/or a blockage in the rear valve block, and/or a pressure sensor fault. In the case of a blocked pipe, repair or replace the faulty pipe as required. In the case of a blockage in the rear valve block or a pressure sensor fault, check and install a new rear valve block as required. Clear the DTC and retest
Vehicle leans/tilts after being left over-night or for some days	-	Leaking air spring(s) Leak from corner valve to gallery Exhaust valve stuck open	Inspect the air harness, valves and air springs for blockages and/or leaks Check operation of height sensors Where possible, refer to the guided diagnostic routine on the approved diagnostic system REFER to: AIR SUSPENSION SYSTEM DEPRESSURIZE AND PRESSURIZE and RIDE HEIGHT ADJUSTMENTS .
After vehicle left over-night or for some days system regularly indicates "Suspension vehicle raising slowly" when first driving off	Suspension vehicle raising slowly	Leaking air spring(s) Leaking reservoir	Inspect the air harness, valves and air springs for blockages and/or leaks Check operation of height sensors Where possible, refer to the guided diagnostic routine on the approved diagnostic system REFER to: AIR SUSPENSION SYSTEM DEPRESSURIZE AND PRESSURIZE and RIDE HEIGHT ADJUSTMENTS
Changes between different ride-heights are not smooth	-	Faulty height sensor	Inspect the air harness, valves and air springs for blockages and/or leaks Check operation of height sensors Where possible, refer to the guided diagnostic routine on the approved diagnostic system REFER to: AIR SUSPENSION SYSTEM DEPRESSURIZE AND PRESSURIZE and RIDE HEIGHT ADJUSTMENTS .
Vehicle air suspension stuck in normal height only Vehicle lowering and vehicle raising to off-road height are disabled Air reservoir will not fill DTC C1A99-1C set	Suspension fault message displayed on the IPC	Rear valve block sensor disconnected Chassis control module software not at the latest level Air pressure sensor circuit - Voltage out of range Air pressure sensor circuit - Short circuit to ground, short circuit to power, open circuit, high resistance Air pressure sensor fault	Refer to the electrical circuit diagrams and check the rear valve block electrical connector for security, backed out pins or corroded terminals. Repair as required, clear the DTC and retest If the fault persists, using the Jaguar Land Rover approved diagnostic equipment, check and update the chassis control module software to the latest level. Clear the DTC and retest If the fault persists, refer to the electrical circuit diagrams and check the air pressure sensor circuit for short circuit to ground, short circuit to power, open circuit, high resistance. Repair circuit as required, clear the DTC and retest