ECU Pinouts

We may earn a small commission from affiliate links and paid advertisements. Terms

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----
A10-EGR 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 Switch-Hazard 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
B9---Brake Switch
B10--Crank Angle SensorCrank Angle Sensor
B11Shift Position Sensor (AT Only)Shift Position Sensor (AT Only)Clutch Switch (HF Only)Rear Defogger Switch
B12--Crank 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
C8-EGR 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 Color
Function​
Wire ColorFunction
DPFI--MPFI-
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


All OBD0, OBD1, and OBD2 as well as DPFI to MPFI conversion charts are available for offline viewing/printing in the following spreadsheet.

Download options:

View on Google Drive: Or download/unzip the attachment (both are the same)

Document is not to be distributed. For HondaSwap.com visitors and member's use only. Reproduction and/or hosting by other websites strictly forbidden.
 

Attachments

  • Honda ECU PinOuts.zip
    14.6 KB · Views: 3,754
Last edited by a moderator:

posol

RETIRED
diagram:

obd0.jpg



plugs2.jpg



obd1.pin.schematics.gif
 
Last edited by a moderator:

posol

RETIRED
OBD 0 Wire Colors off HF/Si

A1No 1 INJ Gold/Silver DOTS
A2GRD w/A4 to main relay Black/silver DOTS
A3No 2 Yellow/silver DOTS
A4GRD w/A2 to main relay Black/silver DOTS
A5NO 3 INJ Red/silver DOTS
A6Purge cut off solenoid HF only Green/silver DOTS
A7NO 4 INJ Red/silver DOTS
A8Lock-up control solenoid valve/VTEC
A9nothing
A10EGR valve HF only Yellow/red
A11EACV w/A17 Blue/yellow
A12MAIN relay w/A14 Green/black
A13MAIN relay w/A15 Yellow/black
A14MAIN relay w/A12 Green/black
A15MAIN relay w/A13 Yellow/black
A16GRD w/A18 Brown/black
A17Nothing or B18 IAB Solenoid
A18GRD w/A18 Black/red
B1Hazzard/Fuse/Brake switch/No HF
B2Tandem Valve control Solenoid valve Orange/silver DOTS NO HF OR SIR
B3FAST Idle valve or A/C Clutch Relay Yellow/Silver DOTS
B4RADIATOR FAN RELAY Yellow/green NO SIR
B5ALTERNATOR White/silver or on SIR OIL PRESSURE SWITCH
B6CHECK ENGINE LIGHT Green/red
B7Shift position sensor A/T only HF/Si A/C SWITCH w/B8 Green/silver DOTS NO SIR
B8A/C SWITCH w/B7 Blue/silver DOTS NO SIR
B9Nothing/COULD BE BRAKE SWITCH for SIR
B10CRANK ANGLE SENSOR Blue/green
B11CLUTCH SWITCH (HF ONLY) Green/black OR Rear defogger Switch on SIR
B12CRANK ANGLE SENSOR White/red
B13NO2 FUSE 10A Blue/white
B14ALTERNATOR Blue/silver DOTS
B15IGNITER UNIT w/B17 White/silver DOTS
B16SPEED SENSOR Yellow/red
B17IGNITER UNIT w/B15 White/silver DOTS
B18Nothing
B19ELD or on SIR KNOCK SENSOR
B20ING TIMING ADJ CONNECTOR Brown/red
C1CYLINDER POSITION SENSOR Orange/silver DOTS
C2CYLINDER POSITION SENSOR White/si lver DOTS
C3TDC SENSOR Orange/black
C4TDC SENSOR White/blue
C5TA SENSOR Red/orange
C6TW SENSOR Red/white
C7THROTTLE ANGLE SENSOR Red/blue
C8SECOND O/2 SENSOR For B16A
C9PA SENSOR Red/white or ON SIR P/S OIL SWITCH
C10BRAKE AND REVERSE LIGHTS (HF ONLY) Green/white OR on SIR BRAKE SWITCH
C11MAP SENSOR White/brown
C12THROTTLE ANGLE SENSOR Green/white
C13THROTTLE ANGLE SENSOR White/yellow
C14MAP SENSOR Green/white
C15MAP SENSOR Yellow/red
C16#1 O/2 SENSOR White/silver DOTS
 
Last edited by a moderator:
Top