HDi Starting Issues (lift pump power circuit)

[mcglynn]

Hi guys.

I commented on another thread, but thought I should open my own thread.

I have been having an intermittent issue lately. My cars lift pump wont run sometimes when the key is turned on. Its hit or miss.

So far ive checked the following;

- Its not the pump, its a brand new APS one & has been bench tested.

- The continuity of the earth wire from the pump checks out. Not sure how to test the power wire?

- I have changed the brown relay to another second hand one with the same results so it says to me its something other than that.

- I tried as suggested by cully to bridge connector 4 & 8 of the relay plug and the pump runs.

- Checked the fuse f35 in the engine bay too, and the other 15 amp ones

- Strangely I was getting 7volts accross the wires when the ignition was off and 3.5v when it was on?

- Checked the plug under the blower motor and seems fine to look at.

- Took the earths all off throughout the car, scraped the paint from beneath them and refitted them back again.

..... The only one that MAY be problematic is the gearbox one?



- Scanned the car and got p0560 which seems to have cleared but may be relevant. The usual egr/glowplug codes too. I ran my battery flat but it cameback even after I had charged my battery and cleared it. Its not there now though.

Im running out of ideas I have nothing else in the tin of ideas. Really losing heart in the car with this problem, as when you think its fixed it creeps up again.