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02 TD4 won't start


Heather Heard
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Hi I'm new to the forum, and wonder if anyone can help? We have a 2002 freelander TD4 ES 2.0 diesel automatic which won't start, it has only happened since the start of the winter, we had the heater plugs changed, but no light on the dashboard, tested fuses 1x100 amp 3x30 amp 12 volts received both sides, when key is turned no voltage at heater plugs works perfectly with a squirt of easy start in air intake, after 20 mins of running the car can be left for up to 2 hours and no problem starting, but left overnight not a hope!

Thankful for any advice PLEASE

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Heater plugs are ECU controlled, the light on the dashboard is not connected to them but is separately controlled by the ECU to give you a warm feeling that it's doing what you expect. In reality the heater plugs may not come on for some starts and may well be switched on when driving around for emissions etc. the RAVE manuals (free download from the part numbers sub forum) explain operation and contain electrical diagrams.

You need to split the problem - could be the heater plug feed really is faulty (perhaps dead relay) or it could be for some reason the ECU doesn't think it needs to switch them on (faulty temperature sensor or something).

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Hi, thanks for replying, very helpful, I think the easiest place to start would be to change the heater plug relay, but as I do not have a manual or mechanically minded, could you please tell me which relay it is and where it's situated, I am really thankful for your help.

Heater plugs are ECU controlled, the light on the dashboard is not connected to them but is separately controlled by the ECU to give you a warm feeling that it's doing what you expect. In reality the heater plugs may not come on for some starts and may well be switched on when driving around for emissions etc. the RAVE manuals (free download from the part numbers sub forum) explain operation and contain electrical diagrams.

You need to split the problem - could be the heater plug feed really is faulty (perhaps dead relay) or it could be for some reason the ECU doesn't think it needs to switch them on (faulty temperature sensor or something).

Hi , thanks for your reply, your help is much appreciated, I think the easiest thing to do would be to replace the heater plug relay, but as I don't have a manual or mechanically minded, please could you tell me which relay it is and where it's situated, you mentioned downloading a manual how would I do this.

Many thanks,

Heather.

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I wouldn't labour too much on the glow plugs,unless the temp is well below zero it should start without them working.A diagnostic check should reveal why it wont go,my guess is poor low side fuel pressure,either a partially clogged fuel filter or a dying low side electric fuel pump.The low side fuel pressure is monitored by the engine ecu,as is coolant and ambient temperature.

Also low cranking speed down to a tired starter motor or poor connections could be a cause.There are plenty of things it could be beside the glow plugs...

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as I do not have a manual

There are full factory manuals downloadable for free in the part numbers forum:

http://forums.lr4x4.com/index.php?showtopic=55181

The FL electrical manuals are here:

Description, operation, pictures of where everything is:

http://www.fuddymuckers.co.uk/files/RAVE/RAVE1/pdf/ln2001/elln011e.pdf

Circuit diagrams:

http://www.fuddymuckers.co.uk/files/RAVE/RAVE1/pdf/ln2001/cdln012e.pdf

As Ally says, a diagnostic check may be the quickest answer, OBD readers are all of a fiver from eBay or any worthwhile garage should be able to read the codes for you for a small donation.

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