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I'm pleased too, we were just about to spend over £20K on a new van and being terrified of leaving it anywhere and it being damaged and broken into.
Problem Resolved.
Fuel pump relay, contacts gone high resistance, Part ref 240109.
Rely cut open with hacksaw blade and contacts cleaned with fine wet and dry paper, just to confirm this was the problem.
New relay ordered £20.79 inc postage.
I don't see how they are due to resistance with no load applied, the DVM has such a high internal resistance that it would still show the battery voltage through a wet piece of string.
If it ever stops raining I will repeat the test with some load applied and see how the voltage falls.
The wires with this voltage appearing on them are very thin and I don't know how they are protected against over current and or short circuit.
2.0L HDI 2004 Bosch ECU.
Do these ECUs have a permanent battery supply? ie. battery voltage with ignition off, key out.
With a battery voltage of 12.41 Volts and using a high resistance DVM with the ECU not connected (off the vehicle) and the ignition key out. I have the following:
Plug .1. Blue Plug. One of the connections reads 11.86 Volts
Plug .2. Middle Plug. One of the connections reads 12.02 Volts.
Plug .3. Blue Plug (Thick Wires) No voltage detected.
Is this as it should be and where do these less than battery voltages come from.
Tony.
Something new that I've discovered today is that if you disconnect the ecu and turn on the ignition the temperature gauge goes from zero/rest to full scale deflection back to zero three times.
Before I start back engineering the wiring loom like a crashed flying saucer is there a relay that supplies the feed to the ecu and is there a fuse that protects the ecu supply(s).
I assume there is at least a constant Battery + and a switched ignition + supply.
Thanks Tony Jones.
Many thanks for your replies.
Engine bay or ambient temperature makes no difference, wet or dry either, I've started to hack my way into the loom in various places but the wires all seem fine. cleaned all ground connections.
One thing that I'm now thing about is loss of power to the ecu, no ecu no engine, and if no ecu power no fault code, this could be supported by the engine check light not being illuminated and fail to communicated with the code reader.
Later today I will look at how the ignition on supply gets to the ecu and or try and recreate the fault by pulling fuses or chopping wires.
I will look through the other posts again I must have missed the one about the two wires to check.
Tony Jones.
I've read some similar but slightly different posts on this site with similar issues and I think it seems to be an increasingly common problem.
I have a Citroen Dispatch (called Victor) 2.0L HDI 2004. owned from new now just over 100K miles. About eighteen months ago the van's engine suddenly stopped while driving, it restarted and no problems for several months.
This started to happen more frequently, when stopped turning the ignition off and on again, the temperature gauge goes mad swinging backwards and forwards and it will not restart until the gauge return to where it should be.
I changed the sender and all was well for several weeks then the same problem, I disconnected the sender and connected a fixed value resistor across the wire, this simulated a coolant temperature of 70C all was well for a few weeks then the same problem.
The ECU has been tested and showed no faults, on its return and refitting the engine stopped after twenty minutes and would not restart, so a tow home was needed.
I ordered a plug and play ECU so the immobilizer is out of the picture, the van started and worked perfectly for a week until this evening, same problem.
In summery.
.1. No fault codes are ever stored. .2. During the fault condition a code reader displays "fail to communicate" .3. MIL (engine check light) does not illuminate during the fault when the ignition is turned on. .4. Fault can occur at and speed, temperature, any weather conditions. .5. Battery Voltage is 14Volt with no excessive ripple. .6. When the temperature gauge returns to normal the MIL indicator comes on and the engine will restart.
I've contacted the AA Technical department, had the van at the local garage and at an auto electrical specialists non of whom have found the problem.
Getting concerned now that it's going to stop at a junction or somewhere dangerous, any help would be very welcome. Tony Jones.
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