How To Tell The Diff Between Series One And Two Ecu's

[juls33]

series on or series two ecu

does any one know how to tell the difference between them as what the numbers stand for

or know where i could find this info

[PlasticStan]

series on or series two ecu

does any one know how to tell the difference between them as what the numbers stand for

or know where i could find this info

Check the Nissan Part number against the following list from FAST.

23710-21U00 RB25DET S1 Manual 1993-08 to 1993-09

23710-21U01 RB25DET S1 Manual 1993-09 to 1994-04

23710-21U02 RB25DET S1 Manual 1994-04 to 1994-07

23710-21U03 RB25DET S1 Manual 1994-07 to 1995-01

23710-21U10 RB25DET S1 Auto 1993-08 to 1993-09

23710-21U11 RB25DET S1 Auto 1993-09 to 1994-04

23710-21U12 RB25DET S1 Auto 1994-04 to 1994-07

23710-21U13 RB25DET S1 Auto 1994-07 to 1995-01

23710-21U60 RB25DET S1 Manual 1995-01 to 1995-08

23710-21U61 RB25DET S1 Manual 1995-08 to 1996-01

23710-21U70 RB25DET S1 Auto 1995-01 to 1995-08

23710-21U71 RB25DET S1 Auto 1995-08 to 1996-01

23710-13U00 RB25DET S2 Manual 1996-01 to 1996-06

23710-13U01 RB25DET S2 Manual 1996-06 on

23710-13U10 RB25DET S2 Auto 1996-01 on

Wow, there was a lot of changes to the S1 ECU, 6 versions in just 2 and a half years.

Edited April 15, 2006 by PlasticStan

[juls33]

thanxs mate i can tell what computer im running now as mine went arse up and the mechanic just got a second hand one and runs soo rich now there must be a drama with it

this fast book or whatever is it online or do you buy it from some where

[mr-r33]

sorry to pull up an old post but can anyone tell me what my ECU was out of

part number

2371M 13U02

[tm_r33]

There is a thread for part numbers you want 'fasted'. Id do it for u except dont have access to fast anymore

[mr-r33]

There is a thread for part numbers you want 'fasted'. Id do it for u except dont have access to fast anymore

hmmm where is this thread you talk of???

[mad082]

in the general automotive section. probably a few pages back now.

it doesn't really matter though. in the r33's the series 1 and series 2 ecu will work in either model (i have personally done this). some people think that the series 2 has the ignitor built into it but they are wrong. the series 2 have the ignitor built into the coils rather than having a seperate ignitor like the s1.

[jjman]

look at the number on the stamp on the front of the ECU. It will have, for example, MEC -52723

If it is MEC-5*** it is a series 1 ecu

If it is MEC-6*** it is a series 1.5 ecu

If it is MEC-7*** it is a series 2 ecu

as aforementioned, they are actually able to be interchanged between the different series anyway. Not really sure on the effects of this though.

just be aware of the auto/manual bit though as detailed above. Iv heard this can influence idle and a range of other things.

good luck.

Edited October 12, 2010 by jjman

[tm_r33]

in the general automotive section. probably a few pages back now.

it doesn't really matter though. in the r33's the series 1 and series 2 ecu will work in either model (i have personally done this). some people think that the series 2 has the ignitor built into it but they are wrong. the series 2 have the ignitor built into the coils rather than having a seperate ignitor like the s1.

i see i see. i thought the ignitor was built into ecu on s2 also. as do many people. i will have a look at the coils. yet another myth busted.

[mad082]

yeah it's a common myth that the ignitor is in the ecu but it isn't, otherwise the coilpack part numbers would be the same and there would be 2 different pfc computers for the different series. but there is only 1 pfc type for the 33 and 2 different coil pack types for the 33.