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post #1 of 8 (permalink) Old 16-05-2017, 10:38 Thread Starter
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Unhappy MG TF computer not communicating

I have a Rover MG TF (54 plate). The key fob stopped working after I had left the roof open and it had got wet, so I arranged for a specialist locksmith with computer diagnostics to attend a re-programme a new fob, but after about 2 hours he gave up - it seems that the onboard computer was just not communicating with his diagnostic kit. The car battery had been flat but we had it charging up via jump leads for an hour or so and electrics all seemed to be working fine. Does anyone have any ideas? My local garage is stumped as is the specialist locksmith - is my car really now a write off as a result? It seems a shame as it is otherwise in good working order!
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post #2 of 8 (permalink) Old 16-05-2017, 11:54
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Have you tried a new battery in the defective fob?

Have you taken the defective fob apart to see if there is still any moisture inside that could be removed?

Do you have a second fob and have you tried it?

Do you have the manual EKA code? That will disable the alarm/immobiliser and allow you to at least use the car, albeit with the laborious process required each time... see here: How do I use my EKA CODE?

If you dont have the code: http://www.mgrovercodes.com/mg/f/eka-code/

Where are you located? - perhaps a friendly forum member may be willing to use their own equipment to try to program a new/replacement fob for you.

Alternatively, are their any ex-MG Rover dealers/service centers near you that might still have the equipment needed to produce a replacement fob for your car?

Good luck?

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post #3 of 8 (permalink) Old 16-05-2017, 13:05
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its probably the garage and locksmiths diagnostics system at fault ,

most of the multi car systems have limited capability on rovers and mg's probably better off looking for someone who has the proper t4 system
after ruling out drying the keyfob as ian has said , try putting it in salt overnight its worked for me before
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post #4 of 8 (permalink) Old 16-05-2017, 14:08
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What is the cars battery voltage?

If the voltage is too low communications will be difficult.

Last edited by Chris T; 16-05-2017 at 14:13.
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post #5 of 8 (permalink) Old 16-05-2017, 16:37
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Quote:
Originally Posted by Nelson999 View Post
I have a Rover MG TF (54 plate)............ I arranged for a specialist locksmith with computer diagnostics to attend a re-programme a new fob, but after about 2 hours he gave up - it seems that the onboard computer was just not communicating with his diagnostic kit.
Being a 2004 model, yours will have the Pektron Systems Control Unit (SCU) instead of the Lucas 5as fitted to earlier TFs.

Unless he has Rover T4, or the Avon diagnostics equipment/software for the Pektron equipped Rovers (or the T300 Chinese made knock-off of this), he won't be able to do anything about programming a fob to the Pektron system.

To code a fob you will need the 22 digit bar code from the original packaging (as you refer to a "new fob", I assume that you have this).

You mention you left the roof open and it got wet - if wet has got into the SCU (most likely through the wiring connector), the first thing it comes into contact with is the radio reciever circuit for the fob radio signal - if this circuit is damaged due to water ingress, the reciever won't work, so even if the fob is transmitting its signal, the SCU won't be recieving it. In this case, the SCU will need to be removed for repair by a competent electronics engineer. Have a read of this thread by technozen: Pektron SCU/BCU. If needed, (and for a sensible fee) he is able to repair damage within the SCU if it is repairable or can give you advice on obtaining a replacement unit. You would need to remove the unit and post it to him for this, but his turnaround time is very quick.

You also mention a flattened car battery - it is not unknown for the SCU to 'forget' some of its settings if left connected to a dying/low charge battery for some time. Forgetting the codes for the fobs is one of the possibilities. I hope you took care when charging the battery from jump leads - always connect the negative on the slave battery to a good earth on the car you are trying to start or disconnect the flat battery from the car completely. Connecting the negative on the slave directly to the negative on the flat battery whilst it is still connected to the car may cause damage to the electronic systems.

Your car certainly needn't be regarded as a write-off - at worst you will need a replacement SCU (together with fobs) from a breaker, and a few minutes with a garage or auto electrician with suitable diagnostic equipment to security match the replacement SCU with your engine ECU.
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post #6 of 8 (permalink) Old 16-05-2017, 16:40
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Quote:
Originally Posted by IanMc View Post
.... are their any ex-MG Rover dealers/service centers near you that might still have the equipment needed to produce a replacement fob for your car?
Current MG Motor dealerships have the T4 and the necessary legacy diagnostic software to deal with the Rover and MG Rover era cars too
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post #7 of 8 (permalink) Old 16-05-2017, 21:40
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Hi and welcome to the forum

Was it the car or the fob that got wet?

Is the fob round or square.

James
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post #8 of 8 (permalink) Old 16-05-2017, 21:47
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System not communicating with diagnostic is usually down to a blow fuse, can't remember which one it is off hand, but had a similar problem with my 1.6 TF, couldn't get it to talk to diagnostic.....found blown fuse and everything happy

As man In The Car has mentioned, your system is a Pektron which would make if far more difficult to program fobs unless bar codes are available, he's also mentioned the worse case scenario get second hand scu with fob(s). Fleabay always have a good few for sale cheaply, I bought complete set few months ago as a spare. got ecu, scu, fob, etc only paid 22 delivered

Last edited by dert; 16-05-2017 at 21:52.
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