Question about 2002 Volkswagen Jetta TDI

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Engine will not Start

No problem with battery or alternator possible problem with electronic fuel pump...manual talks about a fuse where is the fuse for the electronic fuel pump? Any other ideas

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Dont think this is the problem sounds more like an engine immobiliser,try the spare key ?? have you had a mobile phone in your pocket with the key?? it wipes the magnetic bar code in the key ,, car wont start .if you are using the master key with the auto door lock button the try opening and closing the door three times using the button with 10 secs between each command then jump in quick and try to start .if no joy call the breakdown truck and take vehicle to dealers for a recode sorry no other solution

Posted on Nov 05, 2008

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Not only that, we need to know what's happening or not happening.

With what little you've given us, here are the possibilities.

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Hi there,

Here's the deal. If it was the starter then the starter would not turn over the engine when you turn the ignition key - so if the engine is cranking well then that's good and you can forget the starter.

As for the Alternator, as you know, the alternator is a generator that runs off the engine. so when the engine is running you can use that generator to power your electrics and to recharge your battery that has been used to get the engine going in the first place. If the Alternator of the regulator on the alternator (Regulator determines what level of voltage is applied to your electronics circuitry from the generator to prevent over charging the battery and cooking it , and also to prevent having too many volts on your electronic components and blowing something up) but either way the alternator is not used during the engine start up sequence. Until the engine is going you are really only using the battery. So if your battery is really good at the time when your starting you don't have to worry about the Alternator either.

The things that are in play for starting are the starter motor to crank the engine, the timing of the engine set up to ensure the valves are opening and shuting at the right time to let fuel air mixture in and exahust gases out, the Computer system and sensors on the crank and the cam shaft position sensor so the computer can work the fuel injectors, and the spark plugs at the correct time to get the engine going, the fuel pump to ensure you have fuel pressure and the coils to make sure they are generating enough voltage to make the spark jump across the spark plug gap.

If you had to pump the gas last time it may be that the fuel pump is starting to play up , but its a case of working through these components to see what is not happening at the right time.

Do you have any check engine lights on ? that would tell you if the computer is having issues with the sensors. If yes you should go to an Autozone or some where where they offer free On board Diagnostic testing (ODB II checks) to tell you what codes the computer is complaining about at least and that may give you a hint on the road to a fix.

Hope that helps but its definately not the Alternator or starter if the engine turns and if your battery is good.


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