ECU part number compilation

[Tippey764]

I started a list to see what is different about the ECU's in our cars

If you have something that is not on the list then please contribute with your ecu part number. If it is then i don't need to know it

The ecu part numbers missing are not listed online

If you post your part number please include

Year
Trim level
Transmission style
Emissions spec ( either california,49 state or canada )

Also i would like to get canadian part numbers too.

Here is my current incomplete list

Here is a breakdown of what the numbers mean

37820-pt2-000 : This is the part number for ANY honda ecu.

37820-pt2-000 : This defines the engines general performance

37820-pt2-000 : This digit means what region it was for

The list below is for acura legend ECU's but i have not seen any ECU fall outside of its definition

A: USDM Federal Emmissions
L: USDM California Emmissions
C: CDM Canadian
G/E/F/S: EDM European
0/9/J: JDM Japanese
Y: Gulf Spec
Q: Austrailian Spec

37820-pt2-000 : This code seems to change with trim level, transmission type and body style. 0-4 are for manual ECU's and 5-9 are for automatic ECU's

37820-pt2-000 : This code is for minor revisions from year to year.


Automatic

1990 DX 37820-PT3-A52
1990 LX 37820-PT3-A52
1990 EX

1991 DX 37820-PT3-A53
1991 LX 37820-PT3-A53
1991 EX 37820-PT3-A73
1991 SE

1992 DX 37820-PT3-A56
1992 LX 37820-PT3-A56
1992 EX

1993 DX 37820-PT3-A56
1993 LX 37820-PT3-A56
1993 AE 37820-PT3-A56
1993 EX
1993 SE

Manual

1990 DX 37820-PT3-A02
1990 LX 37820-PT3-A02
1990 EX

1991 DX 37820-PT3-A03
1991 LX 37820-PT3-A03
1991 EX 37820-PT3-A23
1991 SE

1992 DX
1992 LX
1992 EX 37820-PT6-A12

1993 DX
1993 LX
1993 EX 37820-PT6-A12

California automatic

1990 DX 37820-PT3-L52
1990 LX 37820-PT3-L52
1990 EX 37820-PT3-L72

1991 DX 37820-PT3-L53
1991 LX 37820-PT3-L53
1991 EX
1991 SE

1992 DX 37820-PT3-L05
1992 LX 37820-PT3-L05
1992 EX


1993 DX
1993 LX
1993 AE
1993 EX
1993 SE


California Manual

1990 DX
1990 LX
1990 EX 37820-PT3-L22

1991 DX 37820-PT3-L03
1991 LX 37820-PT3-L03
1991 EX 37820-PT3-L23
1991 SE

1992 DX
1992 LX
1992 EX 37820-PT6-L12

1993 DX 37820-PT3-L05
1993 LX 37820-PT3-L05
1993 EX 37820-PT6-L12

Wagon automatic

1991 LX 37820-PT3-A60
1991 EX

1992 LX 37820-PT3-A63
1992 EX

1993 LX 37820-PT3-A63
1993 EX

Wagon manual

1991 LX
1991 EX

1992 LX 37820-PT3-A12
1992 EX 37820-PT6-A12

1993 LX 37820-PT3-A12
1993 EX 37820-PT6-A12

Wagon automatic california

1991 LX 37820-PT3-L60
1991 EX

1992 LX 37820-PT3-L62
1992 EX

1993 LX 37820-PT3-L62
1993 EX

Wagon manual california

1991 LX
1991 EX

1992 LX 37820-PT3-L12
1992 EX 37820-PT6-L12

1993 LX 37820-PT3-L12
1993 EX 37820-PT6-L12

1992-1996 prelude S

Automatic

1992 37820-P12-A51
1993 37820-P12-A51
1994 37820-P12-A52
1995 37820-P12-A52
1996 37820-P12-A70

manual

1992 37820-P12-A01
1993 37820-P12-A01
1994 37820-P12-A02
1995 37820-P12-A02
1996

1992-1996 prelude S California

Automatic

1992 37820-P12-L51
1993 37820-P12-L51
1994 37820-P12-A52
1995 37820-P12-A52
1996 37820-P12-A70

manual

1992 37820-P12-L00
1993 37820-P12-L01
1994 37820-P12-A02
1995 37820-P12-A02
1996

[Tippey764]

Some strange points i noticed

Why is the 1991 LX wagon ECU different from the LX coupe/sedan ecu?

Why is the 90/91 dx/lx pt3 different from the ex pt3 ( i hear the EX pt3 doesn't have a speed limiter since it came with proper speed rated tires )

Why did California stop using California spec emission ECU's in 1994 with the prelude S?

[Nurega]

Why is the 90/91 dx/lx pt3 different from the ex pt3 ( i hear the EX pt3 doesn't have a speed limiter since it came with proper speed rated tires )

I can confirm this. My 1991 EX has seen up to 125 in its much younger days - no speed governor.

[Tippey764]

I can confirm this. My 1991 EX has seen up to 125 in its much younger days - no speed governor.

maybe the reason the 1991 wagon LX ecu is different is because it has different tires but still an f22a1? So maybe it doesn't have a speed governor either but for the a1.

Does your ECU's part number match the one listed above?

[GhostAccord]

http://www.hondata.com/techecuid.html

All Honda ECUs have a part number which is located on the side of the ECU and inside the ECU on the connector. e.g. 37820-P72-A01

The part number consists of three components:

Honda's part number for ECU, which is always 37820
Three characters (which are loosely related to the model of car/engine). e.g P72
Three characters (which are the revision of the ECU) e.g. A01 or G52

The middle three characters are the most useful to identify what the ECU is. Different generation ECUs may use the same characters. e.g. a P72 OBD I ECU is different from a P72 OBD II ECU.

The last 3 characters are broken down into 3 parts. "A" generally is used for US ECUs. "G" is European, and "J" is Japanese. There are other versions of this, but you get the idea. The second digit "0-4" typically means manual transmission, where a "5-9" means automatic transmission, and the last digit "1+" is the version number.

The middle 3 digits are the main focus for engine performance. The last three are unit origin, transmission and version #. Don't think that the last digit has a big difference in performance of the vehicle. Unless it's an "L" = crappy California shyte. The version # is probably some components have been upgraded, or the board itself.

[Tippey764]

http://www.hondata.com/techecuid.html





The middle 3 digits are the main focus for engine performance. The last three are unit origin, transmission and version #. Don't think that the last digit has a big difference in performance of the vehicle more than some components may have been upgraded, or the board itself.

updated the original post

Thank you

The very last digit can be a 0 though. The ecu i just bought has a 0 as the last digit

[thepowderblue]

Some strange points i noticed

Why is the 1991 LX wagon ECU different from the LX coupe/sedan ecu?

Why is the 90/91 dx/lx pt3 different from the ex pt3 ( i hear the EX pt3 doesn't have a speed limiter since it came with proper speed rated tires )

True. I have had my 90Ex up to 140.

So pt3 it normal performance on the a1,a4.
And pt6 is higher performance for the A6 engine
What does pt2 mean?

[Tippey764]

True. I have had my 90Ex up to 140.

So pt3 it normal performance on the a1,a4.
And pt6 is higher performance for the A6 engine
What does pt2 mean?

pt2 is for the f20a dohc

There is also a pt5 ecu from a higher compression higher revving f22a3 in europe.

Im going to post this link up as well

Its interesting but not very usefull

http://www.yudongguo.com/dList.asp?C...5%CF%B5&page=1

[thepowderblue]

Now I want a F22A3. Or at least the head and pisions.
anyone have one

[Tippey764]

Now I want a F22A3. Or at least the head and pisions.

The member on this forum lindiz actually has one. You might be able to buy it from him if you were really interested since he just took it out

He told me it was a 9.5:1 compression.

[visualpoet]

Nice write up, Austin. Now I have to find the pic of my p12 out of curiousity.

[GhostAccord]

Now I want a F22A3. Or at least the head and pisions.
anyone have one

Pistons would be a bonus if your looking for OEM cast pistons on the cheap. Head is probably a PT3 casting like the rest of the F22A* engines. Cam could be the same as the A6 as well. IMO the ECU would be the big pickup, if you needed to stay OEM.

Similar to the F22Z2 SOHC VTEC for the Accord 2.2i. It had 9.3:1 pistons and a different ECU tune. The head and valve train remained the same P0A parts. Could have possibly used the same pistons in this motor as the F22A3.

[thepowderblue]

Pistons would be a bonus if your looking for OEM cast pistons on the cheap. Head is probably a PT3 casting like the rest of the F22A* engines. Cam could be the same as the A6 as well. IMO the ECU would be the big pickup, if you needed to stay OEM.

Similar to the F22Z2 SOHC VTEC for the Accord 2.2i. It had 9.3:1 pistons and a different ECU tune. The head and valve train remained the same P0A parts. Could have possibly used the same pistons in this motor as the F22A3.

The f22a3 has flat top pistons. I bet the head might have a different cam then the a6 because of the higher compression and valve clearance but it very well could have the a6 cam. and it would HAVE TO HAVE stronger valve springs because it revs higher and has less piston clearance.

[marcusv8thunder]

I have a PT5 in my 93 Accord which has a F20A8 9.5 comp
I Also have a PT3 in my 91 Accord which has a F20A4 9.5 comp

I dont recall the full number but both will be EDM spec.

[Tippey764]

I have a PT5 in my 93 Accord which has a F20A8 9.5 comp
I Also have a PT3 in my 91 Accord which has a F20A4 9.5 comp

I dont recall the full number but both will be EDM spec.

Did it come with a pt3? Seems strange it would have the same ECU on a smaller motor.