Thread: Disco 2 - no start

Hi all...got under the truck and took off the cover...no oil inside. Removed the crank position sensor - looked like new (...it is new...) and then replaced it with the old (known good) one....AND...dadarhh...no change Same - spins over and does not fire.

So apart from changing the underbonnet fuse box any ideas?

Cheers

Fuel pressure?

I wondered that Peter, but unless you short circut the connector for the fuel pump relay in the under bonnet fuse box you cannot hear the fuel pump at all...and no spark on cranking. So whatever it is is stopping/not starting fuel pump and stopping/not starting coil pulses....

Cheers

Nearly has to be in the fuse box somewhere... Checked all the engine fuses? and the fusible links? Does all the right dash lights appear? Is the cable connector snug in the ecu? Relays energizing for fuel,etc? Is there any way you can swap coils for others? or maybe check that they are receiving power? Never had anything to do with a petrol D2 so Im just doing a general run down of stuff. Certainly a puzzle.
Cheers Scott

bcu , immobiliser related? . tried keys out lock/ unlock try again. Is the dash immobiliser light going out with ign on.? Wiring to cas?

Thanks gents. Going to check wiring to CPS...smells like a CPS fault...
Could be broken PCB somewhere. I do wonder somwtimes about owning a computer run vehicle at 14 years... Perhaps i need to go Isuzu powered County

both coil packs wont fail at the same time,, so you should get at least 4 firing.
There is a fuel line pressure test valve at the back of the engine,, its just a schrader valve,, so a small screwdriver would work,, leave Ign on for more than 5 secs and cover your eyes!!

Agree symptoms sound like crank angle sensor, except for non operating fuel pump.

Once all security signals are received by BCU/ECU, ECU should supply earth path for main relay, which then supplies fuel pump relay.

Your fuel pump works when bridging its own relay so problem points to main relay, which may also explain no spark condition.

So check main earth, then follow wiring diagram for main relay power and fusible links and check applicable connections, fuses, links.

For certanty you can check crank angle sensor in situ with multimeter. Disconnect from harness, whack a probe in each sensor wire, have monkey crank motor, should read 3-7V AC.

Immobilised condition seems unlikely given gradual nature of the failure. Bad earth or main power supply seems to fit symptoms.