WH CRD Trans over temp before ignition. - AUSJEEPOFFROAD.COM Jeep News Australia and New Zealand


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Old 08-06-2018
Douggie  Douggie is offline
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Exclamation SOLVED WH CRD Trans over temp before ignition.

Hey guys been lurking for a while and got frustrated searching so decided to start a thread on this.
So my new (old) beast has developed a new gremlin where before even starting her up shes reading "trans over temp" and "check gauges" with the temp gauge pinned past hot.
Startup is difficult but can be started and driven.
Coolant is clean and radiator, hoses and thermostat are all fine and working as they should.
Tranny appears to have plenty of clean trans fluid.
Waiting on a scantool to arrive in the post to check codes so I cant give much more info yet.
My question is if the trans gets hot does that display on the temp gauge?
I'm thinking likely culprit is temp sensors on the trans is buggered or possibly coolant temp sensor might be bad too as the temp gauge is also reading stupidly high.
I usually tool on my own stuff but most everything I've owned has been points and carby so this thing is like a f'n spaceship.
Any info before I go pulling her apart this weekend would be greatly appreciated.

Last edited by Douggie; 31-08-2018 at 08:07 AM.
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Old 09-06-2018
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Is the radiator fan running flat out? this will happen with a dodgy engine temp sensor.

Without codes all we can do is guess.

Guess number one ..... Conductor plate, this is where the trans temp sensor lives.

Which OBD scan tool did you order, only a few are known to read NAG1 transmission codes. BlueDriver is a good one.
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Old 09-06-2018
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Cheers Clarky.
Yeah thermos come on flat out.
I ordered the bluedriver from the states after reading some reviews.
Should be here in the next week.
I'll go around the suspect connections with the mulitmeter in the meantime as im impatient.
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Old 09-06-2018
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Temp sensor is on the left hand bank of the engine over the centre cylinder, check the connection is making proper contact.
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Old 31-08-2018
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This is finally solved. Been riding the bike each day so its good to have the beast singin again. Too bloody cold around here.
Issue came down to:
Rooted coolant temp sensor
Glow plug 6 circuit short
Many other subsequent shorts
I should have documented my adventures but didn't my advice is if the old girl is throwing codes find the related circuit and check/clean/replace all connectors associated if they look crap. I've got her down to one code which is a powertrain fault p0760 which i havent looked into yet.
Also my bluedriver got rts'd or lost and still no joy so im using a chinese elm327 which is ok i guess for the time being.
I've learnt a lot along the way and have slme excellent resources ive picked up. I'll do a search here and see if theres any that i could add tonight after work.
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Old 31-08-2018
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NAG1 codes
https://www.trnw.net/z-search/NAG1.php

If it is driving okay and no engine light I would just clear the code and see if it returns.

To bad about the Bluedrive Not all code readers can read/clear transmission codes (P0760 Shift Solenoid C Malfunction), it may be a phantom due to low battery voltage, very common in these Jeeps.

I have just purchased this https://appcar-diagfca.com/en/ (software link is sent to you in an email so no waiting for it to arrive) and so far it has been worth the money. Reads all Jeep codes and clears then properly.
Uses ELM327.
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Last edited by Clarky; 31-08-2018 at 10:44 AM.
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