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

juls33

By juls33,
in General Maintenance

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PlasticStan Enthusiast

PlasticStan

Posted
Posted (edited)
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. :domokun:

Edited by PlasticStan
juls33 Collaborator

juls33

Posted
  • Author
Posted

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

  • 4 years later...
mad082 Grand Master

mad082

Posted
Posted

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 Mentor

jjman

Posted
Posted (edited)

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 by jjman
tm_r33 Experienced

tm_r33

Posted
Posted
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 Grand Master

mad082

Posted
Posted

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.

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