Help! Can u solve this mystery ?

[T.Yazar]

I have a friend who has a

E53 3.0D 2002

And it isn't starting! No engine light , No warning just not starting

The car wil be tomorow at my disposal for examination

My ideas

Maybe Not getting any fuel ?

Maybe Not Sparking

His Ideas

Timming chain broken

Questions

Can the chain be broken if the pulley's turning when trying to start the car ?

If yes how can I know if the chain is broken with basic tools ?

Does the e53 have relays for the fuel pump ? If yes where is it ?

How many fuse does the fuel pump have and yes where is it

How to know if the spark plugs getting any juce

If u have a better idea any thing is welcome

Thx

[wpoll]

Question? Does it turn over but not fire, or not even turn over?

Forget anything to do with spark plugs - there aren't any on a diesel engine. There ARE glow plugs but they perform a different function and aren't likely to be the issue here.

Sounds like it could be a problem with the immobiliser in the key (EWS system). If the key is damaged or the EWS module fails, you'll get the "no start" situation you describe.

[Cole]

The fuse for the fuel pump is a 25A fuse situated in the glove box, not sure of the position number but it should be printed on the list on the fuse box lid. My 3.0D had a flat battery the other day, and when I replaced the battery this fuse was blown for some reason and the car obviously would not start. There were no warning lights, starter motor just churned endlessly without firing.

[T.Yazar]

It does turn over but no ignition

[zu11y]

it might be worth putting a diagnostic computer on the car, we have come across bmw cars were the Engine light is not on but fault codes are stored.

[T.Yazar]

Yes I have thought about that but I do not have a dis or inpa system at my disposal

[T.Yazar]

Any fuse or relay other than the 25a in the glove box ? ( fuel pump )

[Cole]

You can get the wiring diagrams for the E53 here WDS BMW Wiring Diagram System - Model Selection

You may have to fiddle with your Java security settings to get the site to work. According to their diagrams there is a fuel pump relay K96 situated behind the glove box, but I am not 100% sure that this apples to the diesel version... Good luck!

[David.X5]

Fuel pump and starter also have relays. BMW relays are color coded. If it's the same color and pins then it should be interchangeable. I think those are both the light green type. Try switching them one by one with a horn relay (or another relay you know works)... The starter relay is in the computer box in the engine compartment. Google it for pics.

[David.X5]

Just saw the post above me ! Make mine a "second".