Td5 electrical

Hi Folks
I'm new on here and as it happens I'm in a pickle. My 2002 TD5 High Cap developed a fault where at anything ove 50mph speedo freezes , fuel drops to zero and temperature reads lower., also heater fan variable dependent rpm. Depress clutch and take foot off accelerator everything jumps back to normal. I could just about live with this, however new battery now fried, fuel pump won't prime engine turns freely. Searched forums checked all fuses and ecu plugs clean with no damage or oil under seat box, bone dry looks clean. Wiggled all fuses relays and wires not even a hint of life. This is a work vehicle regularly serviced not abused and I'm just lost...perhaps the two issues aren't linked but we cannot tell. Any thoughts or ideas would be appreciated. Going through relays again today
Kind regards Mark

Change your location to something a bit more generic.

Welcome

Shimsteriom said:

Change your location to something a bit more generic.

Welcome

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Thank you - all done.

Have run power directly to the fuel pump and that works so not a pump issue. All relays are tested and functioning. Still no pump power from the key. Looks like auto electrician time.

Have you been through the earths?

No - are there obvious points to check in the engine bay etc. Apologies for all the QQ's

Perry1504 said:

No - are there obvious points to check in the engine bay etc. Apologies for all the QQ's

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You need to download rave if you haven’t already. The obvious ones are around gearbox and transfer box. There’s also one on footwell as you lay under car. Passenger side chassis rail has a big earth strap. My temp gauge was dancing. I cleaned all earths and sorted it.

There should be an earth by the ecu under the seat, check clean and tighten that.

wireman said:

There should be an earth by the ecu under the seat, check clean and tighten that.

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Oh and I ran another earth from that to battery

Many thanks for the great support. I now believe I have the correct wiring diagram for a 2002 Defender. Will let you know how this ends ☺

Hi Folks
Works out the ECU is fried in part. Does anyone know if the 1999-2001 ECU is the same as the post 2001; I'm also guessing a discovery ones totally different?
Should have got a 300 TDI

Iirc, the ecus are engine type specific, ie a 10p ecu will only work with a 10p engine and a 15p ecu will only work with a 15p engine. I'm not sure when the 15p engine came in around 2002 I think.

wireman said:

Iirc, the ecus are engine type specific, ie a 10p ecu will only work with a 10p engine and a 15p ecu will only work with a 15p engine. I'm not sure when the 15p engine came in around 2002 I think.

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Many thanks again. Its being trailered away to a specialist with lots of parts off of the shelf that's also local. Hopefully back to work with it later this week!

Yes they're different codes and think 10p is two pot throttle rather than 3 like 15.

Sounds wounding! Stick with it. I had pain with my td5 when I first got it. Injector loom, fuel reg, failed fuelpump, throttle issues etc.

Let us know how you get on.

resto_d1 said:

Yes they're different codes and think 10p is two pot throttle rather than 3 like 15.

Sounds wounding! Stick with it. I had pain with my td5 when I first got it. Injector loom, fuel reg, failed fuelpump, throttle issues etc.

Let us know how you get on.

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Yup - wounding is about right. Its worked solid for two years and regularly tows 3300kg so I guess its paid for itself. Annoying thing is I'm convinced it could have been avoided had I of got it in to the garage sooner!

Its back on the road. The Alternator was the main culprit. Even though all of the relays tested OK, they had some functionality somehow missing - its a mystery! The alternator was in the end responsible for frying the battery and causing all of the issues blowing all the bulbs some fuses and the battery (alternator was actually new only 9 months ago). After it was on the road for a day the horn, flash, dipped, fog, radio and and faulty indicators was remedied with underseat fuse, and the middle under seat relay; I found out how to fix that part from past forums on here - so thanks! The radio alas hasn't worked again.. Fuel pump is a little noisy now so maybe that will go next - who knows!