Bemble
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Sounds like it was designed by a committee that never met 
Gearbox fault, special programmes off
- Thread starter Shawser1203
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Datatek
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LOLSounds like it was designed by a committee that never met
Shawser1203
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So if the resistance test comes back within those parameters, then the solenoid motor is OK?
Datatek
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Maybe, check to see if you get a resistance reading from either pin to the case.
Shawser1203
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Electrics are not my thing, not got the patience. So please excuse the questions and my ignorance. Thanks for all the info guys.
Bemble
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According to Land Rover, P0666 is either a short in the solenoid/wiring or a faulty transfer box controller. If the solenoid & its wiring check out okay, you’re left with the ECU. Good luck.
Phil
Phil
Shawser1203
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Phil will a new ecu be a plug and play? Or will it need to be programmed into my car
Bemble
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Sorry, I don’t know the answer to that. I’m sure someone else will know? Even if you don’t need it coding to the vehicle, though, the replacement ECU would still have to be calibrated to your transfer box using a capable diagnostics kit, to take account of the degree of clutch wear for the actuator mechanism.
Phil
Phil
Shawser1203
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As a short circuit in the solenoid wiring is given as a possible cause for both these error codes, it might be worth checking this out first, including testing the resistance of the solenoid itself.
A resistance check between terminals 9 & 12 at the (largest) ECU connector (when disconnected, obviously) should give a result between 0.2Ω and 10.0Ω.
In case you thought you might remove it, note that the solenoid must be energised for it to be removed/replaced otherwise you won’t be able to engage/disengage it from the shift fork.
https://www.rangerovers.net/threads/magna-steyr-dd295-transfer-box-teardown.41233/#post-349450
Phil
Shawser1203
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As a short circuit in the solenoid wiring is given as a possible cause for both these error codes, it might be worth checking this out first, including testing the resistance of the solenoid itself.
A resistance check between terminals 9 & 12 at the (largest) ECU connector (when disconnected, obviously) should give a result between 0.2Ω and 10.0Ω.
In case you thought you might remove it, note that the solenoid must be energised for it to be removed/replaced otherwise you won’t be able to engage/disengage it from the shift fork.
https://www.rangerovers.net/threads/magna-steyr-dd295-transfer-box-teardown.41233/#post-349450
Phil
As a short circuit in the solenoid wiring is given as a possible cause for both these error codes, it might be worth checking this out first, including testing the resistance of the solenoid itself.
A resistance check between terminals 9 & 12 at the (largest) ECU connector (when disconnected, obviously) should give a result between 0.2Ω and 10.0Ω.
In case you thought you might remove it, note that the solenoid must be energised for it to be removed/replaced otherwise you won’t be able to engage/disengage it from the shift fork.
https://www.rangerovers.net/threads/magna-steyr-dd295-transfer-box-teardown.41233/#post-349450
Phil
Shawser1203
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Datatek
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That reading is 166 Ohms which is not correct, should be between 0.2 & 10 ohms according to Phil.
Shawser1203
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I'm not clued up with this sort of stuff. Not sure if it was correct pins I was touching. I'm sure it was.
Datatek
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You need to be very sure.
Shawser1203
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The reading is 0.166 k ohms
Shawser1203
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When Phil said pins 9 and 12 on ecu, I presume he meant the transfer case control module
Datatek
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Yes,, the k denotes 1000, so 166 ohms with the k removed.
Datatek
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No, the chart Phil published clearly states "Solenoid resistance"
Shawser1203
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Shawser1203
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