Category: P38 EAS System

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The EAS Dryer is an essential and often overlooked EAS component. The primary function of the EAS dryer is to absorb moisture from the compressed air in the EAS system. A potentially bad situation could arrise if moisture contained within the compressed air froze or corroded metalic components. This is not a huge issue for…

P38a EAS – Front Air Spring

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The EAS suspension uses bladders of air to act as the cushion between the axle and the body of the vehicle. These bags can be inflated or deflated depending on the height set by the operator of the vehicle. Solenoids driven by the EAS ECU control air pressure either into or out of each corner…

P38a EAS – Valve Block and Pump

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The EAS pump and block assembly are located under the hood contained within a plastic enclosure marked “EAS”. The pump is a high pressure low volume reciprocating piston pump. The pump is driven by a low voltage/current logic signal from the EAS ECU which triggers a Relay in the Main Fuse Box. The EAS pump…

P38a EAS – Main Fuse Box

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The fusebox is a sometimes troublesome aspect of the Range Rover. I as a rule, carry duplicate green and yellow relays in my glove box. These relays are prone to failure when exposed to high heat or when under continous load. The fusebox is also located in close proximity to the Engine Coolant resovior. This…

P38a EAS – Electronic Control Unit

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Here we come to my favorite part of the Range Rover EAS. The EAS Electronic Control Unit (ECU) is a very elegant and highly efficient microprocessor driven sub-system. The EAS ECU performs all of the logic processing and logic signaling for the EAS operation. The ECU monitors all four EAS sensors and periodically makes adjustments…

P38a EAS – Front Sensor Arm

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The EAS suspension relies almost entirely on the height sensors for empirical data on the outside world. These sensors are a feedback for several assumptions that the EAS ECU makes on the condition of the suspension system. Any failure of a sensor will trigger an EAS Fault. The EAS height sensor is a Potentiometer fed…

P38a EAS – Rear Sensor Arm

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The EAS suspension relies almost entirely on the height sensors for empirical data on the outside world. These sensors are a feedback for several assumptions that the EAS ECU makes on the condition of the suspension system. Any failure of a sensor will trigger an EAS Fault. The EAS height sensor is a Potentiometer fed…

P38a EAS – Rear Air Spring

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The EAS suspension uses bladders of air to act as the cushion between the axle and the body of the vehicle. These bags can be inflated or deflated depending on the height set by the operator of the vehicle. Solenoids driven by the EAS ECU control air pressure either into or out of each corner…

P38a EAS – High Pressure Resovior

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