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Electrics / ECU's
ECU's -- Identification
 
VTEC engines are controlled by 1 of 4 ECU's
 
Latest version   -   OBDIIb  
 
OBDII  
 
OBDI  
 
Earliest version   -   OBD0  
ECU's
 
 
All ECU's should have an identifying sticker
 
ECU sticker
Part No: This is the standard Honda part number for an ECU (37820)
ECU Type: It is possible to use this Number to identify the engine type that uses this ECU
Version: Identifys which version of the ECU
 
Example using my ECU number:

Part No: 37820 - all Honda ECU's start with this number

ECU Type: PWO & PR3 used with the B16A1 engine

Version: OOO is the JDM speed limited version of this ECU
             EOO is the European version with no speed limiter :-)
 
ECU Pins
 
On-line Honda manual - ECU connections - 1991 CRX