W204 C220 cdi cranks won't start, cdi showing ignition off?

Cossie7

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Hi all,

As a previous thread for this but it was started on the wrong path so starting a fresh.

Basically car cranks won't start all rail pressures ok, tried full ecu kit in case was a DAS problem and fitted new front Sam aswell as checked all fuses and relays etc.

The only thing I can see when reading the ecu with star it shows "cause of engine shutoff - ignition off/the combustion engine was not started" and desired reading should be "no engine stop"

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Anyone have Any idea where to start with this?

DAS in eis and ecu all show green so something is missing from somewhere?

Many thanks
 

steveq

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Your battery is showing just 9.9 volts.
I doubt if that is enough to power the electrical systems and the starter motor.

Is it the original Battery?
 

television

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Your battery is showing just 9.9 volts.
I doubt if that is enough to power the electrical systems and the starter motor.

Is it the original Battery?


True that is far too low to test thing
 
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Cossie7

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Hi battery voltage was fine but that was after many tests that included cranking.
 

L John

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Diesels are not my thing.
In a diesel engine how is the injection timed?
My guess is the ecu for injection timing is either faulty or it's not receiving a time prompt to let it know when to power the injector.

Could be as simple as a bad connection or broken wire with any luck.
Like I said, diesels not my thing. Hope you get it sorted.
 

television

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You do have 12 volt fuses and 4 of then in the ECU4
 
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Cossie7

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All fuses in all sam's and front fuse box are fine, also tried swapping relays.

I didn't know about the fuses in the ecu but I did try a full ecu kit with no change.

I wonder if it's worth checking the switches earth for circuit 87?

I just can't see why all DAS would show fine but ecu showing ignition off?

Thanks
 

Steve@Avantgarde

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Check the fuel pressure on crank at the injector rail. Less than 160bar and it wont go.

If you have good fuel pressure you need to check the injectors.
 
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Cossie7

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Hi all,

Thanks, getting 300bar on crank so looks like it's injectors.

Spoke to a diesel place in Glasgow and he wants the full car to check rather than just the injectors which sounds a little strange to me. He says not to remove the injectors yourself as some times they don't work when put back in. It I can't see them been any different to any other common rail?

Cheers
 

Steve@Avantgarde

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Diesel place is talking bol...rubbish. The only thing you need to watch is the quantity correction programming, they are cylinder specific, so mark the injectors on removal.

A proper diesel specialist will test your injectors on a bench and confirm their serviceability.

DTM in Bristol are excellent. Take them out and send to them in the post, they will test and post back.
 


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