New Diesel injector pump - Does Keypad code change?

[skysurfer1]

I may have to change the diesel injector pump on my Citroen Xantia 1.9TD SX (1997 vintage with keypad imobiliser).

I'm thinking of fitting a second hand injector pump.

Will this change my imobiliser keypad code to that for the new pump? (Or is there no problem and the code will remain the same as with my old pump).

If I don't know the keypad code for the new pump, is there a procedure for resetting it to some default that I could do.
Or does it need some equipment to reset it. If so, can I take the pump on its own to a specialist and get the code reset to something I know or is it better to fit the pump on the car and then take the car to a specialist.

Or do I drill out the shear bolts on the imobiliser part of the pump and transfer the old one to the new pump?

Help please!

[howiedean]

I may have to change the diesel injector pump on my Citroen Xantia 1.9TD SX (1997 vintage with keypad imobiliser).

I'm thinking of fitting a second hand injector pump.

Will this change my imobiliser keypad code to that for the new pump? (Or is there no problem and the code will remain the same as with my old pump).

If I don't know the keypad code for the new pump, is there a procedure for resetting it to some default that I could do.
Or does it need some equipment to reset it. If so, can I take the pump on its own to a specialist and get the code reset to something I know or is it better to fit the pump on the car and then take the car to a specialist.

Or do I drill out the shear bolts on the imobiliser part of the pump and transfer the old one to the new pump?

Help please!

I think the wires are for the stop solenoid on the fuel pump which is controlled by you setting the correct code with your keypad. The signal to your pump is on or off and should therefore be interchangable with a new pump.

Regards

Howie...

[skysurfer1]

Thanks, That's encouraging news.

Not much of an imobiliser though!
It sounds like it must be very easy to get the engine going with some jump wires, just like normal. (Without the imobiliser where it just needs the injector pump stop solinoid connecting to 12V and perhaps the glow plugs too).

I assumed that the wires going into the shear bolt protected cover on the end of the injector pump were something like power, ground, data in & data out. Keypad sends codes to imobiliser on the pump. Imobiliser decides if the numbers match and if they do it enables the stop solenoid and sends command back to keypad for green light etc.

Has anyone changed an injector pump which has the enclosed stop solinoid (behind a shear bolt protected plate) and found the car still starts with the car's origonal keypad imobiliser code?

[BonceChops]

It am sure it will need reprogramming. As you said there would be not point having the immobiliser if you could just connect 12v to the stop solenoid to steal it. A few years ago I repaired a Bosch diagnostic tool for a Bosch Diesel agent and I remember him telling me it was for programming the immobiliser behind the hardened plate on the pump itself.

If it was me I would look at removing the hardened plate on your new pump. You could then do away with the immobilser or fit the one from your old pump. You can get them off but it is not supposed to be easy from what he told me (I think it is a lot easier when the pump is off the engine though). They have to get the plates of when they replace a faulty immobiliser module. I think once it is off you have access to the stop solenoid so could just connect a wire to it from the ignition switch like on the good old ones

[howiedean]

It am sure it will need reprogramming. As you said there would be not point having the immobiliser if you could just connect 12v to the stop solenoid to steal it. A few years ago I repaired a Bosch diagnostic tool for a Bosch Diesel agent and I remember him telling me it was for programming the immobiliser behind the hardened plate on the pump itself.

If it was me I would look at removing the hardened plate on your new pump. You could then do away with the immobilser or fit the one from your old pump. You can get them off but it is not supposed to be easy from what he told me (I think it is a lot easier when the pump is off the engine though). They have to get the plates of when they replace a faulty immobiliser module. I think once it is off you have access to the stop solenoid so could just connect a wire to it from the ignition switch like on the good old ones

Yes your right but it is a mechanical pump. I was told that it was the immobiliser was controlled by the ecu and that the wires were to the stop solenoid?
well someone here will be able to tell us the answer.

Regards

[wheeler]

the code is stored in the pump module,if it was stored in the keypad all you would need to do is go along with your own keypad & plug it into the car you want to steal,it only takes seconds to swap a keypad over. what would be the point in having the imobiliser ?

[skysurfer1]

I've now changed the diesel injector pump

In case anyone needs to know this in the future...

I can confirm that the keypad imobiliser number on a '97 TD Xantia does change with the injector pump.

I was fortunate to know the keypad code for my new pump and I can confirm that after changing the pump, my original keypad code no longer worked and the new pump's keypad code did work.

Alan

[Peter.N.]

If there was no chip in the pump it would only need one wire for the stop solonoid but I believe it has three or four.