Land Rover Range Rover Electronic Arir Suspension Rover Manual

EAS - System Information Document
© Rover Group 1998Page 11 of 32
RANGE  ROVER  CLASSIC  SERVICE  cont.
ECU SELF DIAGNOSTIC LIMITATIONS
The ECU may seem to misdiagnose a problem. This is due mainly to the limited number of
inputs on which to base decisions. Because of the similarity of symptoms, multiple faults
may be registered where only one is actually present. The following is a summary of
alternative interpretations of a registered fault message:
• Height sensor above or below has no alternatives.
•...

EAS - System Information Document
© Rover Group 1998Page 12 of 32
RANGE  ROVER  CLASSIC  SERVICE  cont.
FAULT MESSAGE DIAGNOSIS
ANY  HEIGHT  SENSOR  ABOVE  OR  BELOW  LIMIT
This is set when a specific sensor is detected operating outside of its allowable operating
range. Select Dynamic Tests/Heights and Valves to view sensor readings. Also refer to TIBs
60/04/95/US and 60/05/95/US to help locate the defective component.
Verify sensor readings over the entire range of suspension travel. The lower limit is...

EAS - System Information Document
© Rover Group 1998Page 13 of 32
RANGE  ROVER  CLASSIC  SERVICE  cont.
SYMPTOM DIAGNOSIS
THE SYSTEM WILL NOT INITIALIZE
TestBook establishes communications during power-up of the ECU, pressing the initialize
button momentarily interrupts the power allowing TestBook to start communications.
Check that the delay relay clicks when the initialize button is pressed. If it does not, check
the power and ground to the relay. If the relay is functioning properly, the power supply...

EAS - System Information Document
© Rover Group 1998Page 14 of 32
SERVICE (NEW RANGE ROVER)
The most useful tool available to repair any EAS problem is TestBook. The system is only
trying to make four sensors stay within a defined error range. Each rear sensor individually
should be within 2 bits of the other. The same holds true for the front axle sensors.
The TestBook routine for New Range Rover starts out by checking for system fault
messages before allowing access to the main menu. For this reason,...

EAS - System Information Document
© Rover Group 1998Page 15 of 32
NEW RANGE ROVER SERVICE cont.
SUMMARY OF AVAILABLE FAULT MESSAGES
FRONT LEFT SENSOR OUT OF RANGEFRONT RIGHT SENSOR OUT OF  RANGE
REAR LEFT SENSOR OUT OF RANGEREAR RIGHT SENSOR OUT OF RANGE
ENGINE SPEEDVEHICLE SPEED
PRESSURE SWITCH STUCK ONPRESSURE SWITCH STUCK OFF
COMPRESSOR FAILURECORRUPT SENSOR DATA
CANNOT LOWER FRONT RIGHT CANNOT LOWER FRONT LEFT
CANNOT LOWER REAR LEFTCANNOT LOWER REAR RIGHT
FRONT RIGHT VALVE STUCK OPENFRONT LEFT VALVE...

EAS - System Information Document
© Rover Group 1998Page 16 of 32
NEW RANGE ROVER SERVICE cont.
• Rear valve stuck closed may be confused with inlet valve stuck closed or exhaust
valve stuck closed.
• Exhaust valve stuck closed may be confused with front valve stuck closed or rear
valve stuck closed.
Pay particular attention to sensor outputs over the vehicle’s range of suspension travel (See
TIB 60/05/95).
Perform System Test. TestBook will generally find the problem.
The diagnostics following will be...

EAS - System Information Document
© Rover Group 1998Page 17 of 32
NEW RANGE ROVER SERVICE cont.
FAULT MESSAGE DIAGNOSIS
ANY  HEIGHT  SENSOR  ABOVE  OR  BELOW  LIMIT
This is set when a specific sensor is detected operating outside of its allowable operating
range. Select Dynamic Tests/Heights and Valves to view sensor readings (Use Range Rover
Classic menu if necessary). Also refer to TIB 60/04/95/US to help locate the defective
component.
Verify sensor readings over the entire range of suspension travel....

EAS - System Information Document
© Rover Group 1998Page 18 of 32
NEW RANGE ROVER SERVICE cont.
SYMPTOM DIAGNOSIS
THE SYSTEM WILL NOT INITIALIZE
Verify that the delay relay is powering the system. This can be observed by watching the
lamp of the unlatched inhibit switch. Turn the ignition on, but do not start the engine. The
switch lamp should illuminate if the ECU has power at pin 1. If not, check fuses 24 and 44 in
the engine compartment. The lamp should go out when the remote button on the TestBook...

EAS - System Information Document
© Rover Group 1998Page 19 of 32
NEW RANGE ROVER SERVICE cont.
THE VEHICLE IS SLOW TO LOWER
Inspect the exhaust filter for restriction. Perform a Health Check. There is either a restriction
in a hose or the inlet valve is stuck open during the exhaust period. Use Valve Cycling and
listen  for  valve  clicking.
  NOTE: There is no way to determine that the ECU is in a “cooling period.”  The
Compressor and Speeds screen on TestBook can only monitor the active state of the...

EAS - System Information Document
© Rover Group 1998Page 20 of 32
RANGE ROVER CLASSIC CONNECTOR DETAILS
  NOTE: Range Rover Classic connectors shown are for 1995 MY vehicles.  Most
descriptions and colors are the same for 1993 MY and 1994 MY, but connector numbers
may differ.  Refer to the ETM for clarification if required.
C256 Up Switch
PositionColorDescription
1. Red/BrownSwitch Illumination
2. BlackGround E201
3. Yellow/RedStatus Lamp Signal ECU pin 25
4. Yellow/BlueSwitch Common ECU pin 29
5....