Dave2e

New Member
[FONT=&quot]Hello to you on this forum.

I have a 2000 Disco2 and have the weirdest starting problem. I have searched through the Googlesphere for three weeks now trying to find someone with a real answer, no such luck so far, I hope someone can help me.

When the engine is cold, turning the key only makes the dash light up, with no starter activity.

Holding the key in the on position (for up to 10 mins, depending on how cold the South Coast NSW is at the time!) will eventually be rewarded with the starter kicking in and the engine starting immediately.

I originally suspected the solenoid contacts, and replaced them today, with no improvement.

I then measured the voltage on the solenoid when the key is on the start position and found 0 volts, very disappointing but at least now I can discount the starter.

Shorting the solenoid to battery terminal produces cranking but no starting, so I have to assume a computer, switching or interlock issue of some sort.

There is a relay click in the dashboard when the key is turned to the start position, so I have discounted the key switch circuit (am I wrong?)

Does the park switch interlock go intermittent? I have check the interconnect plug and the terminals are clean, dry and shiny.

Not sure where to go from here, anyone have any ideas or come across this issue before? If so, I would love to hear from you[/FONT]
 
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Further update...I ran a direct wire to the solenoid and connected it to the start terminal when in the start position and it just turns over, no firing occurred...wanted to be sure that the computer didn't need a start command that it wasn't getting in order send a start command....but after all, I'm an electronics engineer, not an automotive one.

PLEASE HELP, I'm GOING NORMAL!!!
 
Hi, if you are electronics engineer there's no way you can't find the culprit by watching the diagram IMO...first of all do you have RAVE? ...if not download disc 1 from here land rover rave technical system, untill then, that click you hear from dash area it's the internal contact of the BCU so the ignition signal gets there you just have to figure out if it gets from there to the starter relay's coil or not, also rule out the relay itself, swap R2- starter with R3- headlamp wash for test ...if no joy remove the relay and measure if you get earth path when cranking with key on the relay's coil terminal 86, and you must get positive feed on 85 from fuse F23 interior fusebox(make sure that F23 is not loosen or something) also make sure that fusible link FL12 in engine bay fusbox makes good contact... bridge terminals 30-87 of the starter relay ...corrosion on the interior fusebox's plugs is common due to water ingress and bad contacts within the engine bay fusebox are also common due to heat and eventually oil ingress, also there might be corrosion at the BCU plug too due to moisture

after you download RAVE see Electric circuit diagrams - Charging and starting, and to check circuits follow the diagram and see the connectors/pin disposals in Electrical library - connector views ...once you have RAVE as an electronics engineer you must get to the end of it or we'll speak then... i'm avionics engineer at the basis and managed with these things when i knew nothing about Land Rovers

as you described it seems like a bad contact somwehere on the solenoid's circuit
 
Thanks guys for your helpful responses. I have traced the problem!>>>.....would you believe it was the battery in the key running out of energy!!! Holding the key on allowed my hand to walm the battery, eventually.. ( it progressively took longer as the battery expired) thereby allowing communication to occur with the identification coil attached to the key entry....!!!

I thought through what might cause the computer to stay shut down and came up with the answer as it related to the remote central locking being less sensitive as I had to be close to the D2 to operate CL. Who'd have thought!!

Anyway, I hope this post helps others some day, thanks again guys
smile.png
 
IMO something else happened there, cos that's not an explanation, at least not for what you described...cos the passive remmobilisation magnetic field from the coil stops if in 1 minute after the ignition was switched on the receiver didnt get the signal from the fob's transponder... maybe there was some bad contact in the fob which went away as you replaced the battery or something else while you tried to fix things but deffinitely that with weak battery is not an explanation as long as the car started before without getting a unlock signal from the fob and you holded the key on for more than 1 minute(up to 10 minutes as you said in your first post)

it's good it's sorted anyway but i have the feeling that it won't last too long, let's hope i'm wrong... eventually disable the passive immobilisation with tester to make sure
Passive immobilisation
Passive immobilisation prevents the vehicle from being started unless the authorised key is used to start the vehicle.
There are only two configurations for passive immobilisation:
l passive immobilisation not active
l passive immobilisation active
When the ignition is switched off, the vehicle remains mobilised for up to a maximum of 5 minutes. If however the
driver's door is opened, after 2 minutes 30 seconds, the vehicle remains in a mobilised state for a further 30 seconds.
When the timer in the BCU has expired, the vehicle is immobilised.
Once the ignition is switched on, the BCU transmits a coded signal to the ECM. If the coded signal does not
correspond to the programmed code in the ECM, the ECM is inhibited and the BCU inhibits the starting circuit.
In order for passive immobilisation to occur, the following conditions must be met:
l Driver's door closed.
l Fuel cut-off switch not tripped.
l Key not inserted in ignition.
Passive remobilisation
Whenever the vehicle is immobilised, passive remobilisation of the engine occurs when the ignition is switched on,
allowing the vehicle to be started.
There are three configurations for passive remobilisation:
l Passive immobilisation not active.
l Passive immobilisation active.
l EKA with super locking on receiving good passive remobilisation exciter coil signal.
The BCU controls the passive remobilisation exciter coil (located around the ignition barrel) to generate a magnetic
field which causes the handset to transmit a remobilisation signal. The BCU receives the signal and allows the vehicle
to be started. If a valid signal from the handset is not received within one minute of the ignition being switched to
position II, the BCU stops the passive coil from generating the magnetic field.
 

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