1996 300tdi fuel stop solenoid power issue

Stanleysteamer said:

I was not aware that a Discovery 1 had an inertia switch.

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Jason F said:

Engine cranks over perfectly. Solenoid works everytime when direct fed from battery and engine starts every time. Fault traced to: no voltage from wire on solenoid. No fuses blown. Does anyone have a copy of the wiring diagram so I can trace the black wire at the fuel solenoid back? Just discovered it runs via the immobiliser. I'm thinking I just run a new feed from ignition switch. Anyone know what colour wire from ignition switch ?

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discool said:

The ones with a petrol engine do, thats because they have an electric fuel pump.

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discool said:

Yellow, it can be found along with a white and white/red wire, the three wires are in a black sleeve and can be seen plugged into the r/h side of fuse board, so tee your link wire there, and then via a grommet near the throttle cable into the eng. bay, follow the existing loom to the solenoid, a bit of mechanical protection with a length of sleeving to suit is alway handy.

I did a similar thing around 10 years ago, but that wire went to the ignition coil, when that part of the immobiliser failed on my D1.

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sierrafery said:

Diagrams here https://docdro.id/V5IMQLk

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Jason F said:

Thanks Discool and others. I see the 3 wires plug exactly as you say. I'm guessing the yellow wire is energised when the ignition is on. Thus, I can take a feed off the yellow wire and run it to the cut-off solenoid by the sound of it. I'll look at doing this (and add an in-line fuse). Interestingly I have discovered that if I use the remote fob and lock/unlock 3 times, the power to the cut off solenoid is re-instated. So I'm going to see how that goes for a while.

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sierrafery said:

Might be problem with the inertia switch, on the 300tdi seems that you can't do much about it cos it's incorporated in the alarm unit not on the bulkhead like on petrols or Td5

from the WSM:
Inertia Switch
An inertia switch is incorporated in the Theft Alarm
Unit (Z163). If ignition is on and the vehicle receives
an impact sufficient to activate the inertia switch, the
unit will signal to unlock central locking actuators and
flash hazard lights.

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Jason F said:

Hi discool, I bypassed the immobiliser and now run the fuel solenoid from the ignition switch. So that issue is fixed. My immobiliser fob locks operates as it should, every time reliably. However, now when I push fob button, all doors lock, then a second later all doors unlock. Can anyone explain what could be causing the immobiliser to immediately unlock the doors again? All the door light switches function fine.

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