This is the EKA explanation and entry procedure as taken from the MG-Rover SCU design document...........
Emergency Engine Immobilisation Override (Emergency Key Access - EKA)
The immobilization override code consists of 4 digits, ABCD, in the range 2 to 9.
The emergency override may only be accessed when the vehicle is immobilized and locked, ignition is off and all the doors are closed. It will be aborted by ignition on, any door opening or by operation of the RF remote.
Following a successful emergency immobilization override, the CCT will output a 1 sec pulse.
Following each unsuccessful emergency override attempt, the external sounder will sound for 125ms.
A 2 second time interval is allowed for each operation of the key to input the code.
Following three unsuccessful emergency override attempts, the emergency override mode will be locked out for 10 minutes. The CCT output will continue to operate as for confidence mode.
After the 10 minute lock out period has expired, every incorrect override attempt will result in a 10 minute lock out.
With NVSA4 implementation, these lock out periods are increased to 30 minutes! This is only cancelled by the use of the RF key or the correct code being entered.
Once the engine is mobilised via the EKA method, it will remain mobilised for 10 minutes once the ignition is switched off and the driver's door is opened or remains closed. After this period has elapsed, it will revert to the immobilised state. Immobilisation can also be attained immediately following a successful RF lock command from the remote handset.
Emergency Immobilisation Override Procedure.
To enter the EKA state, the ignition must be off, the driver's door must be closed and locked. The first key unlock operation will be accepted as EKA request and forms part of the first digit entry.
Tum the key in the unlock direction the number of times indicated by the first digit of the code, returning to the centre position each time.
Turn the key in the lock direction the number of times indicated by the second digit of the code, returning to the centre position each time.
Turn the key in the unlock direction the number of times indicated by the third digit of the code, returning to the centre position each time.
Turn the key in the lock direction the number of times indicated by the fourth digit of the code, returning to the centre position each time.
A final turn of the key to the unlock position will produce a 1 second pulse from the CCT to indicate successful Emergency Override. This will invoke a 300 second time delay in which the engine will remain immobilized. Once the 300 second period is over, the engine must be started within 10 minutes or it will become immobilised and will require an EKA procedure for remobilisation.
CCT = Confidence Confirmation Telltale or the alarm LED!