General Pektron SCU/BCU - Page 2 - MG-Rover.org Forums
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post #21 of 297 (permalink) Old 14-02-2011, 20:19 Thread Starter
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Yes, I can now supply a better quality replacement relay, PM me for details.

A replacement SCU would need to be programmed to the car and also have new fobs coded to it.

Free Fob Programming and Diagnostics for forum Supporters... see here.

Pektron SCU/BCU Technical Information and Common Faults... see here.

Discounted Pektron SCU/BCU Relay Replacement for forum Supporters... see here.
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post #22 of 297 (permalink) Old 16-02-2011, 17:15
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With regards to replacement scu boxes. When replacing them are the all the same.. As in will one off a V6 work on the diesel model or do they all have their own unique scu with different part number? I have to replace the one in my zs diesel and have noticed one on ebay complete with fobs off the V6 for 100 which would be bargain for me! Assuming it would work of course
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post #23 of 297 (permalink) Old 16-02-2011, 17:19
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Question SCU Removal

Where is the SUC located on my facelift 45, and how do I remove it?
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post #24 of 297 (permalink) Old 16-02-2011, 20:11 Thread Starter
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The SCU is located behind the centre console, this will have to be removed to gain access.

Free Fob Programming and Diagnostics for forum Supporters... see here.

Pektron SCU/BCU Technical Information and Common Faults... see here.

Discounted Pektron SCU/BCU Relay Replacement for forum Supporters... see here.
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post #25 of 297 (permalink) Old 16-02-2011, 20:15 Thread Starter
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Quote:
Originally Posted by Wackyschild View Post
With regards to replacement scu boxes. When replacing them are the all the same.. As in will one off a V6 work on the diesel model or do they all have their own unique scu with different part number? I have to replace the one in my zs diesel and have noticed one on ebay complete with fobs off the V6 for 100 which would be bargain for me! Assuming it would work of course

The SCU and the engine ECU share a digital security code for immobiliser purposes, if you replace only one unit then this code will no longer match and the result is an engine that won't run.

You either have to match the pair with diagnostic equipment or swap the original units for a complete matched pair taken from another vehicle, the engine types will have to be the same of course.

The SCU units are all the same.

Free Fob Programming and Diagnostics for forum Supporters... see here.

Pektron SCU/BCU Technical Information and Common Faults... see here.

Discounted Pektron SCU/BCU Relay Replacement for forum Supporters... see here.
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post #26 of 297 (permalink) Old 16-02-2011, 21:06
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Quote:
Originally Posted by technozen View Post
The SCU and the engine ECU share a digital security code for immobiliser purposes, if you replace only one unit then this code will no longer match and the result is an engine that won't run.

You either have to match the pair with diagnostic equipment or swap the original units for a complete matched pair taken from another vehicle, the engine types will have to be the same of course.

The SCU units are all the same.
That is interesting, in truth it is what I was hoping for. So if I understand correct I can buy the scu with fobs off ebay, then get someone with a T4 to get it to talk to my engine ecu and then all should be OK.. is there any potential problems with this?
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post #27 of 297 (permalink) Old 16-02-2011, 21:17 Thread Starter
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No potential problems, provided the SCU can be disarmed (if need be) with the fobs then programming via diagnostics should be straightforward

Free Fob Programming and Diagnostics for forum Supporters... see here.

Pektron SCU/BCU Technical Information and Common Faults... see here.

Discounted Pektron SCU/BCU Relay Replacement for forum Supporters... see here.
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post #28 of 297 (permalink) Old 16-02-2011, 21:20
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Thumbs up

Brilliant thanks very much for your advice, much appreciated
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post #29 of 297 (permalink) Old 24-03-2011, 10:18
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I've had problems with my central locking and alarm so took out the scu and found it has burn damage around the connector on the central locking side. The little resistor to the right of the connector (and below the central locking relay) is missing. Does anyone know what value it should be?

Thanks
Simon
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post #30 of 297 (permalink) Old 29-03-2011, 01:53
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technozen have you got a thread where you have dissected one of these ?

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post #31 of 297 (permalink) Old 29-03-2011, 07:52 Thread Starter
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I did a detailed pinout for the MFU some years ago.

As for dissecting it... no real point, they are so cheap to buy and the same unit is fitted to so many models, plus there is no programming involved when they are swapped.

Free Fob Programming and Diagnostics for forum Supporters... see here.

Pektron SCU/BCU Technical Information and Common Faults... see here.

Discounted Pektron SCU/BCU Relay Replacement for forum Supporters... see here.
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post #32 of 297 (permalink) Old 29-03-2011, 13:42
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Exactly, I was thinking about using the internal relays for other devices.
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post #33 of 297 (permalink) Old 29-03-2011, 15:03 Thread Starter
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Do you mean...

taking the relays out to use as parts?

or

using an MFU to do other functions?

Free Fob Programming and Diagnostics for forum Supporters... see here.

Pektron SCU/BCU Technical Information and Common Faults... see here.

Discounted Pektron SCU/BCU Relay Replacement for forum Supporters... see here.
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post #34 of 297 (permalink) Old 29-03-2011, 16:34
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Use the MFU to do other functions.

Just wondering how many and what sort of relays it contains.
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post #35 of 297 (permalink) Old 30-03-2011, 10:07
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technozan is there any chance i could buy a peckton drivers window relay ??
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post #36 of 297 (permalink) Old 02-04-2011, 19:21
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Courtesy light control

I am hoping for your advice on getting my interior lights working after I shorted the bulb terminals in the underfloor storage of my 2003 ZTT cdti.
I have severe arthritis in both hands and when replacing a blown festoon bulb recently I managed to short the bulb holder terminals with the result that all internal lights have failed. I have a pre facelift model with the later type fuse box containing 54 miniature fuses, and have tested nearly every fuse in it to no avail. Since I have the later fuse box, I imagine it is likely that the Pectron type BCU is also fitted, in which case I would suspect the low side driver marked 'B' in your photograph to have died.
Would you agree with this diagnosis or am I looking in the wrong place?
Any help or advice you may be able to offer would be greatly appreciated.
Many thanks.
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post #37 of 297 (permalink) Old 02-04-2011, 21:41 Thread Starter
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I didn't think the 75/ZT used the same Pektron unit.

Generally if the control transistors fail they go short circuit which results in the circuit being "on" all of the time.

Have you checked the fuses?

Free Fob Programming and Diagnostics for forum Supporters... see here.

Pektron SCU/BCU Technical Information and Common Faults... see here.

Discounted Pektron SCU/BCU Relay Replacement for forum Supporters... see here.
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post #38 of 297 (permalink) Old 02-04-2011, 22:05
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The Rover 75 is a canbus system.
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post #39 of 297 (permalink) Old 15-04-2011, 17:24
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Wonderful informative thread. Why oh why do these cars need so much electronics these days? Because they can I suspect.

Last edited by technozen; 16-04-2011 at 08:41.
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post #40 of 297 (permalink) Old 22-04-2011, 13:06
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Really useful thread - thanks

Technozen - YHPM.
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