HDi immobiliser fault

[ianjoh]

I have an early D9 1999 HDi 110, pre com2000 that displays a permanent immob fault.
This problem started back in January during the big freeze and without warning, so I booked it in to the local stealers, hitched it up to a drawbar but had bearly got 1/2 mile when it started on the key. It was a bit hesitant and kept cutting out on tickover but drove it home, the next day the fault was back. This led me to believe it it didnt need reprogramming but was an electrical connection problem. I have checked and redone every earth connection I can find, checked the connectors in the drivers footwell - dry as a bone. When I checked the loom under the battery I found a wire had corroded through where it touched the air con pipe, yippee I thought, but all that cured was the air bag fault (been flashin for years).
Now the weather has got better I am having another go, went to my local breakers and got a bsi, ecu, transponder and key, swopped the chip from the keyfob and plugged it all in and hey presto same fault.
Have I missed anything obvious? There is a little brown box of tricks next to the ecu, what does this do?
The inertia switch is ok.
What else hangs on the CAN bus that can cause problems?
Ian

[tenwierdufos]

I dont know if peugeots are the same (never worked on a peugeot immobiliser, apart from the keypad jobs)

But on vauxhalls you have a loop that goes around the ignition barrel. And on vauxhalls it also has to be matched to the key transponder lol.


Might be worth taking the plastic covering off the ignition barrell and seeing if there is somthing similar.

[ianjoh]

Hi
Thanks for the reply, I was not sure if the ignition barrel reader is coded but I grabbed it any way whilst getting the other bits. Thinking about it, the bsi unit must know and recognise the key as it bleeps if the door is opened with the key in, I think it is the bsi is not talking to the ecu either because of a fault in the loom or something else corrupting the data. Anyone got a wiring diagram??

[ianjoh]

Hello all
Just to give you an update on this battle of wills.
I had a fresh start on this after swopping the ecu & bsi, got the multimeter and wiring diagram out and started taking some measurments around the double relay ( the brown thing next to the ecu ) and it soon became apparent that there was a lack of power from one of the outputs to the ecu, maf & other bits. The fuse was sound and so was the multipole connector at the front, out came the stanley and i opened up the loom from the connector to the engine and there it was! bingo, another corroded wire
Repaired that and it started first time, seems the bsi could recognise the key but couldnt wake up the ecu as it had no power.
Now got another problem with the eml light but no limp mode even after disconnecting the battery, well it did get a few miles up the road .
Anyone got experiance of cleaning high pressure pump regulators?

[steve_earwig]

Sounds like your car's giving you a real fight Well done for sorting out those first two faults (any chance of some further details/pics for future reference? )

Not sure on the HP pump, I don't think anyone on here's had one apart (although I'm happy to be wrong on this) even the Pug parts diagrams just show the pump. You could try talking to a Bosch agent ("bring it in sir, and we'll have a look, don't forget your wallet" )