P38a EAS Faults Data

EAS System Overview

The Range Rover EAS is a wonderful and inventive suspension design. One could argue that the EAS gives the Range Rover owner both a soft and gentle ride and a formidiable off-road spring rate. Anyone who has lived with the Range Rover EAS for any length of time knows that this statement sounds good on paper but has difficulty holding up in real life.

The EAS has problems and can be a real pain sometimes. Just as with any other vehicle system, vulnerabilities are present and if left unchecked can manifest into a full blown breakdown. The system might be intemidating at first but rest assured, if you spend some time studying the operation, you will understand almost all of the most common problems.

EAS Faults - Leaks

Leaks
The symptom of a leak in the EAS system can be subtle at first. The first signs that there is a leak in the EAS, is that the vehicle will lower in height overnight. This can be observed visually when approaching the vehicle or it can be seen when the vehicle is started. If the vehicle has lost height over time, it will adjust the height of the vehicle when it is started. The degree of this height correction and the time taken to adjust the hieght, will give you an idea of the severity of the leak.

For example, the EAS should not loose more than about 1cm of height change in a 24 hour period. If you vehicle has lowerd from normal height down to access level overnight then you have a major leak somewhere. If however it has only lowered about a few mm and corrects the height within a few seconds, then the problem is not terrible.

Leaks are by far the most common causes of EAS Faults. The most common cause of leaks, is a worn and old Air Spring. Air springs do not last forever. At most, they last about 8 years before beginning to develop small leaks. The leaks can be too small to see or hear. Inspect your air springs regularly.

Other areas of the EAS system can be inspected for leaks. The tops of each air springs are vulnerable to leaking. The interface of the high pressure air lines and the EAS valve block can also be a source of leaks. They are worth inspecting.

If no obvious areas of leaks can be found, then it is also a possibility that the valve block has an internal leak. Leaks can be localized to the internal components of the valve block. In these cases, the valve block can be rebuilt with a small cost and modest effort. Valve block rebuild kits can be purchased at; Rover Renovations

EAS Faults - Compressor

Compressor
The EAS compressor is very small and underpowered. Don't get me wrong, it does a good enough job when the EAS is in perfect working order. However when the EAS begins to develop leaks the compressor is quickly overwhelmed.

If overworked, the compressor can begin to fail. Internal components of the compressor begin to wear and overall the pump becomes less efficient. This is another reason that leaks in the EAS should be fixed quickly and not left alone. Small leaks can cause the compressor to run more frequently.

The EAS computer keeps track of the frequency of the compressor operation. If the compressor runs too often, it can trigger an EAS fault. The EAS computer also keeps track of the pressure in the EAS system and the number of compressor overheats. If the compressor is overworked, it will quickly lead to an EAS fault.

The compressor health can be checked with a pressure gauge. The compressor should dead-head the pressure gague with approximately 170-175 psi. If the tested pressure value is significantly lower, then a new compressor seal may be in order. Compressor seal replacement is very inexpensive and can be performed fairly easily. Rover Renovations

EAS Faults - Electrics

Electrics
The EAS like any other system in the vehicle expects and depends on all the electrics to be in good working order. I know that some people who are familiar with previous Lucas vehicles will now be laughing.

It is very important that wiring and fuse systems be inspected for corrosion or physical damage. Some of the most common areas that need inspection are the engine compartment fuse box, the EAS computer compartment and the OBDII port.

The engine compartment fuse box suffers from exposure to engine heat and engine coolant. These are a very common failure item and can be replaced easily for about 150 USD.

The EAS computer is located under the LH seat. Typical inspection includes examination of all wiring harnesses. Make sure that the EAS Delay relay is functioning and that the wiring loom is not damaged. Also inspect the EAS computer C117 connector and ensure that the wiring is not damaged in any way.

The OBDII connector is located in the underside of the RH foot well. It is recomended that the RH footwell pannel be dropped and the backside of the OBDII connector be examined. For example, coolant leaks from the heater core can cause damage to the OBDII connector.

Burnt out fuses are also fairly common. Inspect for any burned out fuses. Specifically, check FUSE 44, FUSE 24 and FUSE 33.

Other Electrical failures include the EAS Heights Sensors and the EAS Driver Pack. The EAS Height sensors rarely fail but when they do, will result in very specific EAS FAult messages. The EAS Fault messages associated with the EAS Height sensors, are the only fault messages that can be taken as truth. When an EAS Height Sensor fault is recorded, it is useful to inspect and clean the wiring harness for that specific height sensor. If the fault returns, then replacement of that specific sensor could be necessary.

Failures of the EAS Driver Pack can exhibit some very strange suspension behaviors and random EAS Fault messages. The EAS Driver pack is located under the EAS Compressor and is attached to the EAS Valve block. The EAS Driver pack is responsible for converting the low current EAS computer logic signals to a high current pulse modulated signal that directly drives the EAS valves. Failures of the EAS Driver pack can result in erratic EAS valve behavior and random height adjustments. The vehicle might suddenly change in height without warning. Another symptom is a reoccuring Pressure switch failure when the switch checks out ok. The EAS Driver pack is not repairable.

FL Signal Incorrect

Front Left Height Sensor Signal Incorrect. Inspect the Front Left height Sensor wiring harness and remove and refit the C117 EAS Computer multi-plug.

FR Signal Incorrect

Front Right Height Sensor Signal Incorrect. Inspect the Front Right height Sensor wiring harness and remove and refit the C117 EAS Computer multi-plug.

RL Signal Incorrect

Rear Left Height Sensor Signal Incorrect. Inspect the Rear Left height Sensor wiring harness and remove and refit the C117 EAS Computer multi-plug.

RR Signal Incorrect

Rear Right Height Sensor Signal Incorrect. Inspect the Rear Right height Sensor wiring harness and remove and refit the C117 EAS Computer multi-plug.

Engine Speed Fault

Investigate the Engine Speed signal.

Vehicle Speed Fault

Possible problem with ABS system vehicle speed signal from one of the wheel speed sensors. Or possible problem with the transmission of that vehicle speed from the ABS system to the BECM and then to the EAS computer.

Pressure Signal Constantly High

Investigate the Main Pressure Switch. Check the functionality. If Pressure switch is normal, then problem is most likely sourced with the EAS Driver Pack.

Pressure signal constantly Low

Investigate the Main Pressure Switch. Check the functionality. If Pressure switch is normal, then problem is most likely sourced with the EAS Driver Pack.

Air Supply Fault

Always check and fix all air leaks before investigating this EAS Fault code. The problem may simply be an air leaks somewhere else in the system.

Air Supply Leak

Always check and fix all air leaks before investigating this EAS Fault code. The problem may simply be an air leaks somewhere else in the system.

Target Heights Incorrect

When re-calibrating the EAS heights, the EAS computer has its own set of internal limits. If those internal calibration target heights are exceeded, then the EAS computer will throw this fault code. Try the re-calibration again, but this time lessen the ammount of change you are putting in the new target height values.

Vehicle Has Moved

While the vehicle was off, the suspension height changed due to a leak in the system. Find and repair all leaks in the EAS system.

Cannot lower FL

The EAS Computer was unable to lower the Front Left corner of the vehicle. This could be due to an obstacle or a problem with the EAS valve block.

Cannot lower FR

The EAS Computer was unable to lower the Front Right corner of the vehicle. This could be due to an obstacle or a problem with the EAS valve block.

Cannot lower RL

The EAS Computer was unable to lower the Rear Left corner of the vehicle. This could be due to an obstacle or a problem with the EAS valve block.

Cannot lower RR

The EAS Computer was unable to lower the Rear Right corner of the vehicle. This could be due to an obstacle or a problem with the EAS valve block.

FL Valve Stuck Open

This fault is indicating that there is a possible problem with the Front Left solenoid valve. But...Be very wary of this fault code. The most likely cause of this fault code is a leak in one of the air springs or general leak in the system. Also make sure and check for a weak compressor. Find and repair all leaks in the system first. Also time how long the systems takes to pressurize the primary air tank.

FR Valve Stuck Open

This fault is indicating that there is a possible problem with the Front Right solenoid valve. But...Be very wary of this fault code. The most likely cause of this fault code is a leak in one of the air springs or general leak in the system. Also make sure and check for a weak compressor. Find and repair all leaks in the system first. Also time how long the systems takes to pressurize the primary air tank.

RL Valve Stuck Open

This fault is indicating that there is a possible problem with the Rear Left solenoid valve. But...Be very wary of this fault code. The most likely cause of this fault code is a leak in one of the air springs or general leak in the system. Also make sure and check for a weak compressor. Find and repair all leaks in the system first. Also time how long the systems takes to pressurize the primary air tank.

RR Valve Stuck Open

This fault is indicating that there is a possible problem with the Rear Right solenoid valve. But...Be very wary of this fault code. The most likely cause of this fault code is a leak in one of the air springs or general leak in the system. Also make sure and check for a weak compressor. Find and repair all leaks in the system first. Also time how long the systems takes to pressurize the primary air tank.

Inlet Valve Stuck Open

This fault is indicating that there is a possible problem with the Inlet solenoid valve. But...Be very wary of this fault code. The most likely cause of this fault code is a leak in one of the air springs or general leak in the system. Also make sure and check for a weak compressor. Find and repair all leaks in the system first. Also time how long the systems takes to pressurize the primary air tank.

Exhaust Valve Stuck Open

This fault is indicating that there is a possible problem with the Exhaust solenoid valve. But...Be very wary of this fault code. The most likely cause of this fault code is a leak in one of the air springs or general leak in the system. Also make sure and check for a weak compressor. Find and repair all leaks in the system first. Also time how long the systems takes to pressurize the primary air tank.

FL Valve Stuck Closed

This fault is indicating that there is a possible problem with the Front Left solenoid valve. But...Be very wary of this fault code. The most likely cause of this fault code is a leak in one of the air springs or general leak in the system. Also make sure and check for a weak compressor. Find and repair all leaks in the system first. Also time how long the systems takes to pressurize the primary air tank.

FR Valve Stuck Closed

This fault is indicating that there is a possible problem with the Front Right solenoid valve. But...Be very wary of this fault code. The most likely cause of this fault code is a leak in one of the air springs or general leak in the system. Also make sure and check for a weak compressor. Find and repair all leaks in the system first. Also time how long the systems takes to pressurize the primary air tank.

RL Valve Stuck Closed

This fault is indicating that there is a possible problem with the Rear Left solenoid valve. But...Be very wary of this fault code. The most likely cause of this fault code is a leak in one of the air springs or general leak in the system. Also make sure and check for a weak compressor. Find and repair all leaks in the system first. Also time how long the systems takes to pressurize the primary air tank.

RR Valve Stuck Closed

This fault is indicating that there is a possible problem with the Rear Right solenoid valve. But...Be very wary of this fault code. The most likely cause of this fault code is a leak in one of the air springs or general leak in the system. Also make sure and check for a weak compressor. Find and repair all leaks in the system first. Also time how long the systems takes to pressurize the primary air tank.

Inlet Valve Stuck Closed

This fault is indicating that there is a possible problem with the Inlet solenoid valve. But...Be very wary of this fault code. The most likely cause of this fault code is a leak in one of the air springs or general leak in the system. Also make sure and check for a weak compressor. Find and repair all leaks in the system first. Also time how long the systems takes to pressurize the primary air tank.

Exhaust valve stuck closed

This fault is indicating that there is a possible problem with the Exhaust solenoid valve. But...Be very wary of this fault code. The most likely cause of this fault code is a leak in one of the air springs or general leak in the system. Also make sure and check for a weak compressor. Find and repair all leaks in the system first. Also time how long the systems takes to pressurize the primary air tank.


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