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Old 29-11-16, 05:06 PM   #1
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Exclamation 806 wont start....ECU or Diesel pump?

Dear all

I am new on here today and would ask your opinion please!

I bought an 806 recently Diesel 1997 as a running project

I let the battery go flat and charged it, but now it wont start

The Electrical guy says its not the ignition as I had that disconnected as I was going to change the barrel due to wear

A different mechanic has it now and cant diagnose between the diesel pump or the ECU and recommends sending the ECU off first to be tested

Any advise on my problem would be ohhh so gratefully received as its potentially an expensive operation as its obviously an old car but I love them

Test....Tom
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Old 29-11-16, 05:40 PM   #2
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Quote:
Originally Posted by thomas.crook View Post
Dear all

I am new on here today and would ask your opinion please!

I bought an 806 recently Diesel 1997 as a running project

I let the battery go flat and charged it, but now it wont start

The Electrical guy says its not the ignition as I had that disconnected as I was going to change the barrel due to wear

A different mechanic has it now and cant diagnose between the diesel pump or the ECU and recommends sending the ECU off first to be tested

Any advise on my problem would be ohhh so gratefully received as its potentially an expensive operation as its obviously an old car but I love them

Test....Tom
mmmmm i wonder what engine this is????????????????????????????????????
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Old 29-11-16, 05:59 PM   #3
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hi... has the imobiliser lost the plot?try a spare key... check battery voltage.. check all fuses...good luck

ps....more info will get more replies.....engine size....is it cranking .....ignition disconected?.....it will help us

Last edited by noddy-hol; 29-11-16 at 06:07 PM.
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Old 29-11-16, 06:14 PM   #4
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its NEVER the ecu thats the method of diagnosis for someone who does not know what they are doing

You changed the barrel so you need to swap the chip from old key to new key !!!!
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Old 29-11-16, 06:25 PM   #5
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It's a 1997 diesel, so will be a 1.9td. So like Reliable406 says, you need to change the chip for the key to match, or simply put the old key inside the coil that fits round the ignition barrel, then give it a try. Think you'll find it starts just fine.
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Old 29-11-16, 06:41 PM   #6
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Thanks for quick reply
So...its a 1997 1905 cc diesel
I didn't change the ignition, only disconnected it to see what was involved to change the barrel and then put the old ignition back and its now connected
The immobiliser goes steady red when the key is turned so its not that apparently
The car does turn over it doesn't get fuel to the pump and it is dry
The mechanic says this can be due to the ECU not playing the game or the diesel pump, hence the confusion
Thanks again, any input would be valuable
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Old 29-11-16, 07:56 PM   #7
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1 the ecu is NOT controlling fuel it controls the egr system on these
2 the light should go out so your immobiliser IS your issue
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Old 29-11-16, 08:05 PM   #8
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Thank you Reliable406
I was given duff info in that case....how can I sort the immobiliser?
Cheers
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Old 29-11-16, 08:13 PM   #9
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You need to check on the light scenario as its been a while since i done 1 but im sure what happens is light is flashing when off when ignition is turned on light goes solid and once immobiliser is happy light goes out same as renaults.

Citrail may be able to confirm but im sure thats correct
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Old 30-11-16, 10:21 AM   #10
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Forunately mine doesn't have one, but I drove an XM a few weeks ago.

If the light was flashing, the car wouldn't start.
Once the correct code had been entered the green light was lit and the car started.

Assuming the 806 is the same.
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