Help, My 2003 TD4 wont start!!!

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hi just wondered if the fuel cut off switch has cut in as its electrical just something to try i think its up close to the fuse box under the bonnet
 
hope this explains it better
Step by step

Before connecting any leads make sure the vehicles are the same voltage and that they're parked with their handbrakes on and ignition off. The vehicles must not touch as this can cause sparks or an explosion.
  1. Use the red jump lead to connect the positive terminal of the donor vehicle's good battery to the positive terminal of the flat battery.
  2. Then use the black lead to connect the negative terminal of the good battery to a suitable earthing point on the engine or chassis of the other vehicle. This earthing point must be away from the battery and fuel system.
  3. With both leads connected wait three minutes for the voltages to equalise before starting either engine.
  4. Start the engine of the donor car and allow it to run for a minute then, with it still running, start the engine of the other car and leave both running at a fast idle for ten minutes. Do not remove the jump leads while the engines are running as this can cause serious damage to the electronics on either car.
 
booboodag said:
hope this explains it better
Step by step


Before connecting any leads make sure the vehicles are the same voltage and that they're parked with their handbrakes on and ignition off. The vehicles must not touch as this can cause sparks or an explosion.
  1. Use the red jump lead to connect the positive terminal of the donor vehicle's good battery to the positive terminal of the flat battery.
  2. Then use the black lead to connect the negative terminal of the good battery to a suitable earthing point on the engine or chassis of the other vehicle. This earthing point must be away from the battery and fuel system.
  3. With both leads connected wait three minutes for the voltages to equalise before starting either engine.
  4. Start the engine of the donor car and allow it to run for a minute then, with it still running, start the engine of the other car and leave both running at a fast idle for ten minutes. Do not remove the jump leads while the engines are running as this can cause serious damage to the electronics on either car.
Click to expand...

If the battery of the donor vehicle is completly flat it may be worth turning the headlights on too. This helps to prevent spiking an ecu. Surge protectors can also be bought as seperate units or built into jump leads. I have a set of leads with one built in. It's great for petrol cars but I find it too restricting on larger engined diesels.
 
What's is the difference then, between fitting a fully charged battery where a fully discharged battery has been, and a 'jump start' other than 2 to 3V. The vehicles' system must be able to take the normal maximum regulated alternator output voltage?
 
I am not an expert but I think it is more to do with asking the alternator to provide amps and voltage to two batteries when you connect them directly. If you do a search on line you will find a large number of people that have fried the CPU’s by incorrectly jump starting their cars, it can also cause problems for the donor car as well. That is why most garages use the portable battery starters that are designed for that use and not jump leads
 
Radnorman said:
What's is the difference then, between fitting a fully charged battery where a fully discharged battery has been, and a 'jump start' other than 2 to 3V. The vehicles' system must be able to take the normal maximum regulated alternator output voltage?
Click to expand...

A sudden power surge can damage your ecu. It's a bit like the differenece between a nice steady electric feed to your house and a lightening strike.
 
Ok may be this will close this out, when you have the donor car running connected directly battery to battery it charges at approximately 14.2 volts, once you start cranking the host car then the alternator on that car tries to put another 14.2 volts into the battery, whilst the alternators synchronise you run the risk of a 28.4 volt spike hence fried CPU, when you connect to an earth point on host car it can not happen.
 
Also if you disconnect the leads on the donor car before the host car has put enough charge into the engine then the host cars alternator will suddenly go from thinking that the battery is fully charged to dead flat and will spike the voltage again, probably 99 time out of a hundred will be ok
 
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