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What year? Does the check engine light come on with the ignition? If GEMS (pre 99) if the BeCM has lost sync with the engine ECU, you'll get no check engine light and no turn over. If Thor (99 or later) if sync has been lost it will turn over but not fire as the ignition and fuel injectors are turned off. Any messages on the dash?
 

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Discussion Starter #3
How do you sync back the Becm and ECU,
It is a 2001, 4.6 HSE, Range Rover, P38.
It flashes a range of messages. The keys were changed and supposedly programmed back doing the left and right on the lock. The key turns the ignition and the security light goes out. It turns the engine but won't fire no spark.
We are in Belize, so no Landover dealer or program to put it on
 

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1995-2002 Range Rover Classic
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If we were to change out the Becm and ECU from another range rover that are already synced, would it work?
in theory it would work, in practice no it does not work, (per land rover info during class). you still have the keyfob and ignition key coil which would not match the vehicle, it is my finding and understanding that if you were wanting to do said swap you would need, odometer cluster, door lock, ignition lock and coil, becm, engine ecu, one or all fobs and the vin from donor vehicle.
furthermore, I don't know of anyone who has attempted this endeavor thus little to know outcome to report.

on a 1999 to 2002 if locked, press unlock button on hand set fob next to vehicle and then you turn the key to unlock. do the reverse if unlocked, this action will synchronise your hand set fob to the vehicle. have you considered underlying issues as why it may not have spark?, a failed crank sensor perhaps?
 

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Discussion Starter #6
We already changed the crank sensor for a new one. Is there any way to sync back the Bcem and ECU,? Thanks for your help
 

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1995-2002 Range Rover P38A
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If it is in an alarmed state, key sync will not work.
This is why we need to know ALL of the messages it throws at you when you attempt to start.
To re sync, if that is indeed the issue, you will need a specialist unit like an BBS Nanocom to read the numbers and re sync.
Again, if it thinks it's being stolen, you cannot re sync, you can however enter the EKA IF you know it, and IF this feature has been enabled.
I assume you have triple checked that the plug for the CPS is in good shape and firmly connected? The wires leading to it?
What was the reason for changing the CPS?
A brief history of the original symptoms would be helpful.........
It is also, of course possible the new CPS is faulty.....Is it aftermarket, or genuine Bosch?
 
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