Hi guys
Help!!! After a few problems with van it failed to start, after using ecuscan I found 1701 fault, I had Ecu refurbed because of water ingress, and found a broken wire under pass light, which was fixed, van started run lovely, turned van and hasn't started since. I've fitted new Ecu again due to more water running over Ecu, this has now been sorted, still doesn't run. Ive had Ecu immo taken off thinking it was a immobiliser problem. Ive checked fuel pump in tank, ok. Filter cleaned and replaced, fuel is getting to the high pressure pump but not getting to the rail. Also in the dash there is a light with a car and lock on it. Ive stripped all the front off including the radiator to get better access, and have notice a wire with yellow plug end (2 wires) and both sockets have broken connectors inside of them. For the life of me I can't find where this wire Goes to!! It comes from drivers side close to top of radiator. Before I start paying silly money for high pressure pump, is there a repair kit, or do I need to change regulator switch connected to hp pump, and does anybody know where this wire goes

The yellow wire and the one in hand please... Thanks

Hi Cusiphil From what I have read trying to fix my problem (2.3 multijet not starting) if your light in the dash with car and padlock is staying on when the ignition key has been turned to start position the immobilis/ecu has not reconised the key.
Check your ignition barrel where the clip or ariel wire sends the info to the ecu it may have broken.
Or read more posts on here for further guidance/help.
Took me ages to find my problem but appears to be sorted have been on a few short trips without a problem
Good luck
Regards Lexion770

Many thanks I'll take a look there, would it still be on if immo has been mapped out? I'll let you know cheers

All wires seem to be okay behind the barrel so far
Does anybody know if the pressure regulator stops, in the high pressure pump, the fuel flowing to injector rail, and throws the padlock/ vehicle lock light on? Or if there's a solenoid that stops the fuel going to the rail, again in the HP pump?
Thanks guys

No Cusiphil, the HP pump isn't controlled in any way. The regulator is a mechanical device that allows the fuel to flow through a bypass when the maximum pressure is reached, without ECU intervention. The actual pressure is monitored because at low rpm/high load the injection duration is modified.
Only if the pressure doesn't reach the minimum value the ECU takes action, like switching the warning light on, or completely suppressing injection.

I'm getting fuel to the HP pump, but nothing to the rail. Would I be getting fuel that far, with the padlock/ car light on? I have had immo taken out of Ecu, but with van not starting I'm unsure if the reprogramming worked. Has anybody taken the immo out, does the a flock/ car light stay on? Go out?

I would be inclined to say the immo hasn't been fully taken out , on most vehicles it's not just in the ecu. It's also in other modules or bcm , instruments etc


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For the connector in the original post try the bottom of the coolant bottle for the short one, on mine the longer one isn't connected to anything,
Ivan

Thank you Ivan

I'll try another go with a different immo program, I would of expected the padlock / car light not to illuminate if immo was taken out, I'll try new immo and let you know
Thank you all for your input in this

CDK said:

the HP pump isn't controlled in any way. The regulator is a mechanical device that allows the fuel to flow through a bypass when the maximum pressure is reached, without ECU intervention.

Click to expand...

Codswallop, the pressure regulator on the pump is pwm driven by the ecu. For starting it is driven at a preset duty cycle of about 40%, once started the duty cycle is varied by the ecu according to demand.

If you have access to an oscilloscope you can check the signal to the regulator.
https://personel.omu.edu.tr/docs/ders_dokumanlari/894_52413_1913.pdf

I'm sorrry, I got that wrong. This particular engine (and probably more members of the family as well) uses a solenoid to regulate the rail pressure. Don't know why, imho it opens the door for trouble because the rail pressure depends on one plastic plug and a pair of thin wires from the ECU to the regulator.
So get yourself a scope Cusiphil and observe what is happening at the solenoid input!

Thanks guys, really helpful ?