Honda ECU List​ 1988-2006

ECU CodeOBDVTEC SupportFound InOEM Engine Code Supported
P051NO1992-1995 Honda Civic CXD15B8
P061NO1992-1995 Honda Civic DXD15B7
P071YES1992-1995 Honda Civic VXD15Z1
P081YES1992-1995 JDM/EDM Honda Civic/CRX VTi/VXiD15B
P0A1YES1994-1995 Honda Accord EXF22A
P131YES1992-1995 Honda Prelude VTECH22A
P141NO1992-1995 Honda Prelude SiH23A
P271NO1992-1995 Honda Civic EG JDM1600 SOHCD16?
P281YES1992-1995 Honda Civic EX/Si / del Sol SiD16Z6
P291NO1992-1995 JDM DomaniSOHC ZC
P2E2NO1996-1998 Honda Civic DXD16Y7
P2M2YES1996-2000 Honda Civic (NZ) SOHC VTEC
P2N2NO1996-2000 Honda Civic HX (VTEC-e)D16Y5
P2P2YES1996-2000 Honda Civic EXD16Y8
P2T2bYES1999-2000 Honda Civic SiB16A2
P301YES1992-1995 Honda del Sol DOHC VTEC, JDM Civic EG SiRB16A(JDM)/B16A3
P391YES1992-1995 JDM AccordF22 (SOHC VTEC)
P541NO1992-1995 JDM Domani (DOHC), 1.8L AccordB18B1
P54-G31YES1997 Honda Accord 1.8 LS (EDM)
P5P2YES1996-1999 Honda Prelude Type SH / Type S(JDM)H22A
P611YES1992-1993 Acura Integra GSRB17A1
P701NO1992-1995 JDM Domani?
P711YES1992-1995 JDM Integra (SOHC VTEC)SOHC VTEC ZC
P721YES1994-1995 Acura Integra GSRB18C1 / B18C (JDM)
P722YES1996-2000 Acura Integra GSRB18C1 / B18C (JDM)
P732YES1996-2000 Acura Integra Type R (JDM and USDM)B18C5 / B18C (JDM)
P741NO1992-1993 Acura Integra LS/GS/RSB18B1
P751NO1994-1995 Acura Integra LS/GS/RSB18B1
P752NO1996-2000 Acura Integra LS/GS/RS/SEB18B1
P761NO1994-1995 JDM Integra SOHC ZCSOHC ZC
P841YES (VTEC-E)1992-1995 JDM Civic Eti (auto)?
P911YES1992-1995 JDM Civic Coupe (SOHC VTEC)?
PBA2YES1997-2000 Acura 1.6 EL (Canada)D16?
PCT2YES1997-2001 Honda JDM ITR/CTRB16B
PCX2bYES1999-2001 Honda S2000F22A
PG60NO1988-1989 Acura Integra, All ModelsB18A
PG70NO1988-1989 IntegraD16A1
PM50NO1988-1991 Honda Civic/CRX DXD15B2
PM60NO1988-1991 Honda Civic/CRX SOHC SiD16A6
PM70NO1988-1991 Honda ZC (JDM EF)DOHC ZC
PM80NO1988-1991 Honda CRX HFD15B6
PM90NO1988-1991 Civic Std/CRX baseD15B2
PND2YES02-04 RSXK20A3
PNF2YES02-04 Civic SiK20A3
PPA2NO02-04 CRVK24A1
PR20NO1988-1991 Honda ZC (EDM)ZC
PR30YES1989-1991 Acura Integra XSi/RSiB16A
PR3-J000YES1992 Acura Integra/ JDM EF 8/9B16A / B16A1
PR3-J510YES1992 Acura Integra/ JDM EF 8/9B16A / B16A1
PR40NO1990-1991 Acura Integra LS/GSB18A
PR41NO1992-1993 Acura Integra LS/GS/RSB18A
PR50NO1990-1991 JDM Integra ZxiSOHC ZC
PR71YES1992-1995 NSXC32
PRA2YES02-04 Euro CTRK20A
PRB2YES01-06 RSX Type SK20A2/K20Z1
PRC2YES02-04 JDM ITRK20A
PRD2YES02-04 JDM CTRK20A
PS90NO1988-1991 Honda Civic 4-door EX AutomaticD16A6
PW00YES1989-1991 Honda Civic/CRX SiR (or auto from 90-91 Integra (Xsi)B16A

Honda ECU Part Numbers Decoded​

Honda ECU part numbers are a series of 3 alphanumeric sections.
FORMAT: xxxxx-xxx-xxx

  • The first block is the Honda part number denoting it is an ECU. This is almost always 37820.
  • The middle 3 digits are the main identifier of the ECU and used in the table above, first column, ECU Code. This code is often associated with the engine or car. for example, a PR3 ECU often has an engine with a PR3 headstamp.
  • The Last 3 characters denote the ECU Revision type and each character is a different indicator.
    • The first character indicates market the ECU is intended to support.
      • A – USA
      • C – Canada
      • G – Europe
      • J – Japan
    • The second digit denotes transmission type
      • 0 – Manual
      • 5,7,9 – Automatic
    • The last character indicates the version number and generally does not have any significant changes to connectivity or function. Additional revisions may exist on the ROM inside, which will be indicated on the chip itself.

How to tell if your Honda ECU is Automatic or Manual​

You can tell the type of transmission the ECU is designed to control by the trailing 3-digits in the full model code.

As you saw above the 2nd character in the final 3 of the part number indicates the transmission type. Look for the 0 in that position for manual.

OBD0 ECUs​

(eg, PM6, PR4, PW0, PR3, PM7):
Manual = 000, 001, 002, A00, A01, A10, J00, J001, C01, C00
Auto = J51, J50, A50, A51, 900, 901, A60, C50, C51, X30, A80

OBD1 ECUs​

(eg, P28, P30, P61, P72, P91, P08)
Manual = 000, 001, 002, 003, A00, A01, A02, C00, C01, C02, J00, J01, J02
Auto = J50, J51, 900, 901, 902, C50, C51, C52, A50, A51, A52

OBD2 ECUs​

(eg, P2E, P2P, P2J, P72)
Manual = 000, 001, 002, 003, A00, A01, A03, C00, C01, C02, C03, J00, J01, J02, A11, C11
Auto = A70, A71, A72, A91, A92, C70, C71, C72, C91, C92

Locating the ECU​

The ECU is generally located in the passenger compartment instead of the engine bay. This helps keep it clean and dry and away from extreme temperatures. It is a computer, after all.

  • OBD0 cars – usually located under a metal plate in the passenger seat footwell
  • OBD1 cars – usually located under the carpet in the passenger seat footwell (on the right side)
  • OBD2 cars – usually located behind a plastic panel in the passenger seat footwell

ECU model numbers

in 88-91 ecus (PM6, PR4, PW0, PR3, PM7):
5spd = 000, 001, 002, A00, A01, A10, J00, J001, C01, C00
Auto = J51, J50, A50, A51, 901, A60, C50, C51, X30, A80, L50, L51

92-5 ECUs (P28, P30, P61, P72, P91, P08)
5spd = 000, 001, 002, 003, A00, A01, A02, C00, C01, C02, J00, J01, J02, G00, G01
Auto = J50, J51, 901, 902, C50, C51, C52, A50, A51, A52, L50, L51, G51

96-00 ECUs (P2E, P2P, P2J, P72, P73)
5spd = 000, 001, 002, 003, A00, A01, A03, C00, C01, C02, C03, J00, J01, J02, A11, C11
Auto = A70, A71, A72, A91, A92, C70, C71, C72, C91, C92

from the patterns we can learn the following:
first letter = country of orgin
J = Japan
C= Canada
A=USA
G=Europe
second digit, if 5, 7, 9 then ecu is auto usually
third digit denotes the version/variation
L = California emissions or typically high altitude states as well.

Honda ECU Pinouts​

OBD 0​

Pinout'88 HF/Si'90-1 DX (Std.)'90-1 HF/Si'89-92 EF8/9 SiR
A1No.1 INJAux INJ w/A3No.1 INJNo.1 INJ
A2GRD w/A4 to Main RelayGRD w/A4 to Main RelayGRD w/A4 to Main RelayGRD w/A4 to Main Relay
A3No.2 INJAux INJ w/A1No.2 INJNo.2 INJ
A4GRD w/A2 to Main RelayGRD w/A2 to Main RelayGRD w/A2 to Main RelayGRD w/A2 to Main Relay
A5No.3 INJMain INJ w/A7No.3 INJNo.3 INJ
A6Purge Cut-Off Solenoid ValvePurge Cut-Off Solenoid ValvePurge Cut-Off Solenoid Valve (HF Only)Purge Cut-Off Solenoid Valve
A7No.4 INJMain INJ w/A5No.4 INJNo.4 INJ
A8Lock-up Control Solenoid ValveLock-up Control Solenoid ValveLock-up Control Solenoid ValveSpool (VTEC) Solenoid Valve
A9
A10EGR Valve (CA A/T Only)EGR Valve (HF Only)Pressure Regulator Cut-Off Solenoid Valve
A11EACV w/A17EACV w/A17EACV w/A17EACV
A12Main Relay w/A14Main Relay w/A14Main Relay w/A14Main Relay w/A14
A13Main Relay w/A15Main Relay w/A15Main Relay w/A15Main Relay w/A15
A14Main Relay w/A12Main Relay w/A12Main Relay w/A12Main Relay w/A12
A15Main Relay w/A13Main Relay w/A13Main Relay w/A13Main Relay w/A13
A16GRD w/A18GRD w/A18GRD w/A18GRD w/A18
A17EACV w/A11
A18GRD w/A16GRD w/A16GRD w/A16GRD w/A16
B1Hazard Fuse w/Brake SwitchHazard Fuse w/Brake SwitchHazard Fuse w/Brake Switch
B2Tandem Valve Control Solenoid ValveTandem Valve Control Solenoid Valve
B3A/C Clutch RelayA/C Clutch RelayFast Idle ValveA/C Clutch Relay
B4Radiator Fan RelayRadiator Fan RelayRadiator Fan Relay
B5AlternatorAlternatorAlternatorOil Pressure Switch
B6Check Engine LightCheck Engine LightCheck Engine LightCheck Engine Light(10A)
B7Shift Position Sensor (A/T Only)Shift Position Sensor (A/T Only)A/C Switch w/B8
B8A/C SwitchA/C SwitchA/C Switch w/B7A/C Switch
B9Brake Switch
B10Crank Angle SensorCrank Angle Sensor
B11Shift Position Sensor (AT Only)Shift Position Sensor (AT Only)Clutch Switch (HF Only)Rear Defogger Switch
B12Crank Angle SensorCrank Angle Sensor
B13No.2 Fuse (10A)No.2 Fuse (10A)No.2 Fuse (10A)No.2 Fuse (10A)
B14AlternatorAlternatorAlternatorAlternator
B15Igniter Unit w/B17Igniter Unit w/B17Igniter Unit w/B17Igniter Unit w/B17
B16Speed SensorSpeed SensorSpeed SensorSpeed Sensor (Electrical)
B17Igniter Unit w/B15Igniter Unit w/B15Igniter Unit w/B15Igniter Unit w/B15
B18
B19ELDELDELDKnock Sensor
B20Ign. Timing Adj. ConnectorIgn. Timing Adj. ConnectorIgn. Timing Adj. ConnectorIgn. Timing Adj. Connector
C1Crank Angle SensorCrank Angle SensorCylinder Position SensorCylinder Position Sensor
C2Crank Angle SensorCrank Angle SensorCylinder Position SensorCylinder Position Sensor
C3TDC SensorTDC SensorTDC SensorTDC Sensor
C4TDC SensorTDC SensorTDC SensorTDC Sensor
C5TA SensorTA SensorTA SensorTA Sensor
C6TW SensorTW SensorTW SensorTW Sensor
C7Throttle Angle SensorThrottle Angle SensorThrottle Angle SensorThrottle Angle Sensor
C8EGR Valve Lift Sensor (CA A/T Only)O2 Sensor B
C9PA SensorPA SensorPA SensorP/S oil switch
C10Brake SwitchBrake SwitchBrake and Reverse Light Switch (HF Only)Brake Switch
C11MAP SensorMAP SensorMAP SensorMAP Sensor
C12PA SensorPA SensorThrottle Angle SensorThrottle Angle Sensor
C13PA SensorPA SensorThrottle Angle SensorThrottle Angle Sensor
C14MAP SensorMAP SensorMAP SensorMAP Sensor
C15MAP SensorMAP SensorMAP SensorMAP Sensor
C16O2 Sensor AO2 Sensor AO2 Sensor AO2 Sensor A

OBD 1 and OBD 2

OBD2aOBD2bFunctionOBD1ColorNotes
A01B05Injector 4A02Yellow
A02B04Injector 3A05Light Blue
A03B03Injector 2A03Red
A04B11Injector 1A01Brown
A05A08SO2HNo connection on OBD1
A06C01PO2HA06Orange/black
A08B12VTSA04Orange/White
A09B20LG1A26Black/Red
A10B02PG1A23Black
A11B01IGP1A25Yellow/Black
A12B23IACVA09Green/White
A15A06PCSA20Red
A16A16FLRA07Green/Yellow
A17A17ACCA15Black/Red
A18A18MILA13Green/Orange
A19A02ALTCA16White/YellowNo connection on D16Y8 P2Nb
A20B13ICMA21Red/Green
A22B22LG2B02Brown
A23B10PG2A24Black
A24B09ICP2B01Yellow Black
A27A20FANCA12Yellow/Green
C01C31CKFPNo connection on OBD1
C02C08CKPPB15Blue/Green
C03C20TDCPB13Orange/Blue
C04C29CYPPB11Orange
C05A27ACSB05Blue/Red
C06A24STSB09Blue/White
C07A10SCSD04Brown
C10B21VBUD01White/Blue
C11C22CKFMNo connection on OBD1
C12C09CKPMB16Blue/Yellow
C13C21TDCMB14White/Blue
C14C30CYPMB12White
C15C10VTMD06Orange/GreenConnected to VTS on OBD2a
C16A26PSWB08Brown/Red
C17C05ALTFD09PinkNo connection on D16Y8 P2Nb
C18C23VSSB10Yellow/Blue
D01C27TPSD11Pink/Black
D02C26ECTD13Red/White
D03C17MAPD17Pink/White
D04C19VCC1D19Yellow/Green
D05A32BKSMD02Greem/White
D06C03KSD03Red/GreenNo connection on P08, P28
D07C16PO2SD14White
D08C25IATD15
D10C28VCC2D20Yellow/White
D11C18SG2D22Green/White
D12C07SG1D21Green/Blue
D14A23SO2SNo connection on OBD1
D16A30ELD10Green/RedNo connection on D16Y8 P2Nb

DPFI to MPFI

Read our full article on DPFI to MPFI Conversion here: DPFI to MPFI Conversion

Pin#Wire ColorFunction​Wire ColorFunction
DPFIMPFI
A1Yellow 2Aux InjectorBrown#1 Injector
A2Black 1Main Relay/GroundBlack 1Main Relay/Ground
A3Yellow 1Aux InjectorRed#2 Injector
A4Black 2Main Relay/GroundBlack 2Main Relay/Ground
A5Red 2Main InjectorLight Blue#3 Injector
A6GreenPurge Cut Off Solenoid Valve (Coil)GreenPurge Cut Off Solenoid Valve (Coil)
A7Red 1Main InjectorYellow 1#4 Injector
A8Yellow 3Sedan LX A/T
A10RedEGR Solenoid Control Valve (Coil) (A/T only)
A11Blue/YellowEACV (Coil)Blue/YellowEACV (Coil)
A12Green/Black 2Main RelayGreen/Black 2Main Relay
A13Yellow/Black 2Main RelayYellow/Black 2Main Relay/Injector Resistor Box
A14Green/Black 1Main RelayGreen/Black 1Main Relay
A15Yellow/Black 1Main RelayYellow/Black 1Main Relay/Injector Resistor Box
A16Brown/BlackGroundBrown/BlackGround
A17
A18Black/RedGroundBlack/RedGround
B1White/GreenHazard FuseWhite/GreenHazard Fuse
B2OrangeTandem Control Solenoid ValveBlue 1Fast Idle Control Solenoid Valve
B3YellowA/C Clutch RelayYellowA/C Clutch Relay
B4Yellow/GreenRadiator Fan RelayYellow/GreenRadiator Fan Relay
B5White/YellowAlternatorWhite/YellowAlternator
B6Green/OrangeCheck Engine Warning LightGreen/OrangeCheck Engine Warning Light
B7Green/OrangeA/T Shift Position Console Switch (Park, Neutral)
B8Blue/RedA/C SwitchBlue/RedA/C Switch
B9
B10OrangeCrank Angle Sensor
B11Green/BlackA/T Shift Position Console Switch (Drive)
B12WhiteCrank Angle Sensor
B13Blue WhiteMain RelayBlue WhiteMain Relay
B14Blue 2To Yellow, To AlternatorBlue 2Alternator
B15White 1Ignitor UnitWhite 1Ignitor Unit
B16Yellow/RedSpeed SensorYellow/RedSpeed Sensor
B17White 2Ignitor UnitWhite 2Ignitor Unit
B18
B19Green/RedElectric Load DetectorGreen/RedElectric Load Detector
B20BrownIgnition Timing Adjusting ConnectorBrownIgnition Timing Adjusting Connector
C1OrangeCrank Angle SensorBlue/GreenCylinder Position Sensor
C2White 4Crank Angle SensorBlue/YellowCylinder Position Sensor
C3Orange/BlueTDC SensorOrange/BlueTDC Sensor
C4White/BlueTDC SensorWhite/BlueTDC Sensor
C5Red/YellowTA SensorRed/YellowTA Sensor
C6Red/White 1TW SensorRed/White 1TW Sensor
C7Red/BlueThrottle (Position) Angle Sensor (TPS)Red/BlueThrottle (Position) Angle Sensor (TPS)
C8YellowEGR Lift Valve Sensor
C9Red/White 2PA SensorRed/White 2PA Sensor
C10Green/White 3Brake SwitchGreen/White 3Brake Switch
C11White 1MAP SensorWhite 1MAP Sensor
C12Green/White 2EGR Lift Valve Sensor/Pa Sensor/Ignition Timing Adjusting Connector/TA Sensor/TPS Sensor/TW SensorGreen White 2Pa Sensor/Ignition Timing Adjusting Connector/TA Sensor/TPS Sensor/TW Sensor
C13Yellow/WhiteEGR Lift Valve Sensor/Pa Sensor/TPS SensorYellow/WhitePa Sensor/TPS Sensor
C14Green/White 1MAP SensorGreen/White 1MAP Sensor
C15Yellow/RedMAP SensorYellow/RedMAP Sensor
C16White 3O2 SensorWhite 3O2 Sensor