Which car this ECU is coming from? Mystery... - MG-Rover.org Forums
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post #1 of 11 (permalink) Old 08-11-2016, 08:49 Thread Starter
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Question Which car this ECU is coming from? Mystery...

I would be very pleased to get any explanation about the 6th letter of my new ECU vin (SAR RF S W A B 5D 808206).



According to Rimmerbros :

The 6th letter represents the Class of vehicle eg:
C = 200 BRM
D = Streetwise (RO)
H = 200, 214i, 220D (CO)
J = 200 (S2)
K = Streetwise (R1)
L = MG (M2)
M = 200, 214Si, 216Si, 220SD, 220SKi, 200 (C1)
N = 200 (TL 3.1)
P = Streetwise (R2)
W = 200Vi, 200 (S1)
X = MG (MO)
Y = 200, 216SLi, 216Si (LHD), 220SDi (LHD), 200 (Y2)
Z = 200 (C3)

But my 6th letter is obviously an "S" without any hesitation!
How on earth can I know which type of vehicle it goes from?

Even more puzzling, the "A" letter indicates that the car had a restricted throttle body (LP = low power), but I was told that:
- no MG ZR had ever had a restricted TB
- that all 04 & 05 Rover 25 were unrestricted

Yet the car was built in 2005.

Any clue to help me solve that mystery?

Thanks.
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post #2 of 11 (permalink) Old 08-11-2016, 16:24
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Quote:
Originally Posted by Dorchester View Post
- no MG ZR had ever had a restricted TB
True.

Quote:
- that all 04 & 05 Rover 25 were unrestricted
Not so. Mk2 25s and Streetwises remained available in 84ps restricted form.

The 45 and ZS (Irish market) also came with the unrestricted 1.4.
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post #3 of 11 (permalink) Old 08-11-2016, 16:54 Thread Starter
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Quote:
Originally Posted by LeRich View Post
True.



Not so. Mk2 25s and Streetwises remained available in 84ps restricted form.

The 45 and ZS (Irish market) also came with the unrestricted 1.4.
Thanks @LeRich for those informations.
But when Steve bought the ECU on Ebay, the latter was given as coming from a MG ZR. A bit weird, isn't it?
So I'm still puzzled by that likely uncommon VIN number.
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post #4 of 11 (permalink) Old 08-11-2016, 17:42
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If you take the part number from your pic (nnn100743) and put it into the Rimmerbros site, it comes up with the ECU being used on the 25, 45, MGF and MGTF models. I don't know, but you may find the mysterious 6th letter is related to one of the other models? In one of the links to the ECU units on the Rimmerbros page, it does say that the ECU is programmable to the car.

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post #5 of 11 (permalink) Old 08-11-2016, 20:00
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My best guess is that what appears to be an 'S', is not in fact an S at all, but has been disfigured by a smudge of ink or oil; or that it is an error (although unlikely).

What is certain is that the car with that VIN number was not an MG ZR.

Full decode of the VIN:
S = United Kingdom
AR = Austin Rover (continued to be used for Rover Group and MG Rover)
RF = Rover 200, 25 and MG ZR
?? = unidentifiable
W = 5 door
A = 1.4 16 valve MPi Low Performance
B = Manual, 5-speed, Right Hand Drive
5 = 2005 model year (ie Mk2/facelift built from mid 2004 onwards)
D = Longbridge

I would estimate that the serial number of 808206 would probably give it a build date sometime in late 2004.

From the above, I would say it was almost certainly a Rover 25 or Streetwise with the 84ps restricted throttle body. The apparent 'S' may perhaps be a corrupted 'D', which would make it from a Streetwise.

The actual ECU and its internal programming will be the same for both 84ps and 103ps versions of the 1.4 engine (it is well known that it only requires a derestricted throttle body fitting to an 84ps car to turn it into a 103ps one).
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post #6 of 11 (permalink) Old 08-11-2016, 20:42 Thread Starter
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Thanks @Man in the Car, I'm definitely convinced that it was a Rover 25 or the like, but I would bet that the month was actually February (2) and the year 2005 (5), as shown on the labels.
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post #7 of 11 (permalink) Old 08-11-2016, 21:11
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It's odd the VIN number seems to be a mess, the ebay listing said it was from a ZR

However no effect to the end result
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post #8 of 11 (permalink) Old 09-11-2016, 07:23 Thread Starter
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Quote:
Originally Posted by lolsteve98 View Post
It's odd the VIN number seems to be a mess, the ebay listing said it was from a ZR

However no effect to the end result
Indeed it doesn't matter at all. But I'm so curious and inquisitive !
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post #9 of 11 (permalink) Old 09-11-2016, 18:26
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Quote:
Originally Posted by Dorchester View Post
..... but I would bet that the month was actually February (2) and the year 2005 (5), as shown on the labels.
May well be - I was going from knowing that the serial numbers of the 25/ZR turned through 798000 in November 2004 and 810000 in February 2005, so you are quite probably correct (I hadn't noticed the numbering on the main label and twigged that it was probably the manufacture date).

Quote:
Originally Posted by lolsteve98 View Post
It's odd the VIN number seems to be a mess, the ebay listing said it was from a ZR
It may well have been a ZR which had recieved a second hand replacement ECU (either in conjunction with a replacement SCU as a preference to having the original SCU repaired), or perhaps the original ECU had been fried by incorrect usage of jump leads (a not unheard of occurence).
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post #10 of 11 (permalink) Old 27-12-2016, 08:40
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Looks like a 5 to me, in which case the 6th letter will be a W. That would then indicate that it's from a 200Vi /200 (S1) according to your Rimmer Bros notes.

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post #11 of 11 (permalink) Old 27-12-2016, 15:56 Thread Starter
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I called to Torque to help me solve the mystery.

Definitely here is Torque answer, after asking the ECU its identity:

SARRFSWAB5D000000

So "S" is the right letter, as it reads on the label, which sends me back to the beginning!
And Torque looks unable to read the six last digits.

But what on earth this "S" stands for?
I dislike any acknowledgement of failure...
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