p12 ecu question

[jkrolikowski]

I'm going to buy a p12 ecu, but I noticed that while they all begin with the model # 37820-P12, they end with a different model #. For example, I've seen these three so far:
37820-P12-A02
37820-P12-A00
37820-P12-A52

Does it make a difference? As long as the model # begins with 37820-P12-A__ will it work? Anyone know what the last two numbers mean?

Lastly, does it make a difference if the ecu is for a MT or AT? Or is this not a concern since the tcu handles the transmission? I ask because the people advertising p12 ecu's often advertise that it's for a MT or AT. Why advertise this if it doesn't matter?

[Joey GT-R]

I believe you need an Automatic ECU to work with the TCU as that determines how the auto trans shifts. If it was Manual it wouldn't matter either way because there is no TCU. I believe that throws a CEL though. If I'm incorrect somebody will correct me.

[visualpoet]

IIRC,
A00 = USDM MT
A02 = Non USDM MT
A52 = USDM AT

If it was L0x or L5x they would be California emissions ECUs.

I don't think you should have any issues in a manual car, but an auto I'd go for the auto ECU. There's some debate over whether the mapping is the same, since they do designate a difference in the two ECUs.

I've got a 37820-P12-A51 in my 5 speed coupe. It's for the California emissions 4 speed auto 'lude. Hasn't given me any trouble at all.

[GhostAccord]

That is what part of the last three digits tells you. Whether or no tthe ECU is M/T or A/T.

The letter is the location code A = USDM, L = USDM (Cal. Em), G = EDM & J = JDM. The next number is the transmition type 0 = Manual & 5 = Automatic. The third digit (0-1-2) represents the version number of that particular ECU

37820-P12-A02 = (USDM M/T ver.2)
37820-P12-A00 = (USDM M/T ver.0 - Original)
37820-P12-A52 = (USDM A/T ver.2)

[jkrolikowski]

Thanks everyone. This is very useful information. fyi - my car is 91 Honda Accord EX, MT.