Thread: 300tdi Defender ignition problem?

Hi,
The thing that let's the motor run or stop is a 12V supply to the fuel injection pump, this wire goes into the rear of the pump.

My guess is your not getting 12V to this except in the start position, check for a good connection and voltage on that wire.

Why did you you add the start button? Has the start contacts in the ignition switch died?

I'm guessing the run contacts have also died.

If the short to the body has killed the switch, I'm guessing you have some poor body earths in the car.

Hope this helps

Tony

I think I agree with Tony's analysis.

Its also possibly taken out the main fusible link or connection to, that supplies 1/2 of the fuse box in the drivers kick panel area.

Thanks Tony, I just confirmed your analysis - no power to the fuel injection pump until the key is in the start position. Now to figure out why

As for the start button.. eh, it's a long story, but the TLDR is that I let someone talk me into it.

Originally Posted by TonyC

Hi,
The thing that let's the motor run or stop is a 12V supply to the fuel injection pump, this wire goes into the rear of the pump.

My guess is your not getting 12V to this except in the start position, check for a good connection and voltage on that wire.

Why did you you add the start button? Has the start contacts in the ignition switch died?

I'm guessing the run contacts have also died.

If the short to the body has killed the switch, I'm guessing you have some poor body earths in the car.

Hope this helps

Tony

Originally Posted by Blknight.aus

Its also possibly taken out the main fusible link or connection to, that supplies 1/2 of the fuse box in the drivers kick panel area.

I'll see if I can find that, thanks Blknight.aus

am currently going through this with a customers toyota,

the internal connection that bridges the ignition to the start position in the switch has corroded away in the normal run position, If you hold the key just either side of the detent, the switch tests ok...

Originally Posted by TonyC

Hi,
The thing that let's the motor run or stop is a 12V supply to the fuel injection pump, this wire goes into the rear of the pump.

My guess is your not getting 12V to this except in the start position, check for a good connection and voltage on that wire.

Why did you you add the start button? Has the start contacts in the ignition switch died?

I'm guessing the run contacts have also died.

If the short to the body has killed the switch, I'm guessing you have some poor body earths in the car.

Hope this helps

Tony

I bypassed mine and ran a separate feed through its own switch hidden under the dash to the injector pump. Slows down thieves to as motor turns over but wont start untill that secret switch is on.