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Discussion Starter · #1 ·
Trans Failsafe Error after batter connected. No comms with diagnostics now.

Hi fellow owners,
Got a bot of a situation with my L322.
Its a 2004, 4.4V8 with the ZF box.
Disconnected and reconnected the battery at the weekend and upon reconnection, it has thrown up the Tans Failsafe error on the dash.
I had it plugged in to the reader to clear the fault, or so I had thought. Turns out none of the machines will read due to a comms issue with the transmission. (Rac then a Local Shop)
Recently, just had it at a Land Rover Specialist and they also confirmed that even their reader could not communicate.
They suspect the Control Module may have been damaged during the reconnection of the battery.
It drives up and down the gears, but only 1st to 4th. Wont go into 5th.
Some times the Lo range light comes on and sometimes it shows as being in low range on the pixel display, but its definitely still high range.
All fuses in the glove box are good, the 30A fuses in the box under the bonnet also all good ( the 5 in the module box)
Has any one else had the same issue, and if so, what was the cure?
Bit of a pain to be honest!
I just want to make sure Im not missing anything before I go down a replacement Module route.
Many thanks in advance.
 

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Discussion Starter · #2 ·
I have just ordered a new alternator as I tested battery and alt output. It was below 12v when idle and only just managed 14v if I turned off all ele items.

Anyone think this may be the reason the diagnostic machine would not see the control module? I see a lot if comments on the need for a certain voltage to allow these modules to function correctly.

Next question. How long to replace an alternator on a v8 petrol 322?
Bearing in mind I used to work for a land rover specialist many moons ago. So I'm not inexperienced . Never had much to do with these newer RRs though, apart from owning them.
 

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Re: Trans Failsafe Error after batter connected. No comms with diagnostics now.

alternator is about an hour and a half. It is liquid cooled and unlike anything Land Rover ever had before. Requires cooling system drain, clutch fan removal and drive belt removal. Reverse and refill coolant sysem then air bleed. Be sure to get a new O ring for the alternator just a couple bucks but worth it. Don't reuse the old one...
 

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Discussion Starter · #4 ·
Re: Trans Failsafe Error after batter connected. No comms with diagnostics now.

Hi,

Thanks for that info.
I just booked it into the local garage as I'm short on time.

Now I have more transmission related faults showing up on the IP. I'm hopeful that this is a voltage issue, but I charged the battery last night and its no better this morning. But, still low charging V, so as I say, fingers crossed it cures the problem.

Hope winter is good to you over in Ottawa. Lovely place. Crrently in the process of emigrating to ON. Hope to be visa'd up for the end of next year!
Best rergards
 

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Re: Trans Failsafe Error after batter connected. No comms with diagnostics now.

Cheers and all the best in your application..
 

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Discussion Starter · #6 ·
Re: Trans Failsafe Error after batter connected. No comms with diagnostics now.

Problem solved.

Bought myself a diagnostic machine, connected up and cleared all faults.
Got rid of the Trans Failure as well as Sup failure.

Not sure why the three others that looked at this for me did not manage to clear/find this. Perhaps I have just been lucky and it will rear its head again , but lets see.
 
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