Immobilization problem - Lucas pump
The problem:
Have you changed your vehicle's Lucas Diesel injection pump because yours was broken, broken, ...?
Have you lost the keys to your vehicle and have found another "junkyard" game?
Your vehicle no longer starts because of an engine immobilizer / immobilizer problem.
The solution:
The cleanest solution is to resynchronize the system correctly so that the immobilizer plays its role. But it is often at too great a cost considering the value of the vehicle.
An alternative is to remove the immobilizer. With the consequences that this implies.
The tutorial below only covers vehicles fitted with a Lucas Delphi diesel injection pump fitted with a coded stop solenoid valve.
In other words, as long as the immobilizer has not sent the correct code to this solenoid valve, the fuel supply is stopped. Hence the term stop solenoid valve.
This coded solenoid valve works with 3 wires (a ground, a + 12V after contact, and a data wire carrying the code).
The solution is to replace the coded solenoid valve with an uncoded solenoid valve. The uncoded solenoid valve is supplied by one of the 3 wires, that of the +12 after contact.
To replace the coded solenoid valve with an uncoded solenoid valve, you have the quick method or the own method.
The quick method consists of grinding the metal protection covering the access to the coded solenoid valve. This is done without disassembly. Pay close attention to sparks during the grinding process and be careful not to cut other components. Duration of intervention: inf. 1 hour.
The proper method is to dismantle the pump, remove the metal protection, change the solenoid valve and reassemble the pump. This implies stalling the distribution before intervention. The timing belt should be changed immediately. Before fitting another used pump, recommend this solution.
Duration of intervention of this method with the original pump mounted on the vehicle: approx. 3h
Uncoded solenoid valves are available on this site by clicking HERE or by searching for the reference: