Honda ECU Pinouts
OBD 0
Pinout | '88 HF/Si | '90-1 DX (Std.) | '90-1 HF/Si | '89-92 EF8/9 SiR |
---|---|---|---|---|
A1 | No.1 INJ | Aux INJ w/A3 | No.1 INJ | No.1 INJ |
A2 | GRD w/A4 to Main Relay | GRD w/A4 to Main Relay | GRD w/A4 to Main Relay | GRD w/A4 to Main Relay |
A3 | No.2 INJ | Aux INJ w/A1 | No.2 INJ | No.2 INJ |
A4 | GRD w/A2 to Main Relay | GRD w/A2 to Main Relay | GRD w/A2 to Main Relay | GRD w/A2 to Main Relay |
A5 | No.3 INJ | Main INJ w/A7 | No.3 INJ | No.3 INJ |
A6 | Purge Cut-Off Solenoid Valve | Purge Cut-Off Solenoid Valve | Purge Cut-Off Solenoid Valve (HF Only) | Purge Cut-Off Solenoid Valve |
A7 | No.4 INJ | Main INJ w/A5 | No.4 INJ | No.4 INJ |
A8 | Lock-up Control Solenoid Valve | Lock-up Control Solenoid Valve | Lock-up Control Solenoid Valve | Spool (VTEC) Solenoid Valve |
A9 | - | - | - | - |
A10 | - | EGR Valve (CA A/T Only) | EGR Valve (HF Only) | Pressure Regulator Cut-Off Solenoid Valve |
A11 | EACV w/A17 | EACV w/A17 | EACV w/A17 | EACV |
A12 | Main Relay w/A14 | Main Relay w/A14 | Main Relay w/A14 | Main Relay w/A14 |
A13 | Main Relay w/A15 | Main Relay w/A15 | Main Relay w/A15 | Main Relay w/A15 |
A14 | Main Relay w/A12 | Main Relay w/A12 | Main Relay w/A12 | Main Relay w/A12 |
A15 | Main Relay w/A13 | Main Relay w/A13 | Main Relay w/A13 | Main Relay w/A13 |
A16 | GRD w/A18 | GRD w/A18 | GRD w/A18 | GRD w/A18 |
A17 | EACV w/A11 | - | - | - |
A18 | GRD w/A16 | GRD w/A16 | GRD w/A16 | GRD w/A16 |
B1 | Hazard Fuse w/Brake Switch | Hazard Fuse w/Brake Switch | - | Hazard Fuse w/Brake Switch |
B2 | Tandem Valve Control Solenoid Valve | Tandem Valve Control Solenoid Valve | - | - |
B3 | A/C Clutch Relay | A/C Clutch Relay | Fast Idle Valve | A/C Clutch Relay |
B4 | Radiator Fan Relay | Radiator Fan Relay | Radiator Fan Relay | - |
B5 | Alternator | Alternator | Alternator | Oil Pressure Switch |
B6 | Check Engine Light | Check Engine Light | Check Engine Light | Check Engine Light(10A) |
B7 | Shift Position Sensor (A/T Only) | Shift Position Sensor (A/T Only) | A/C Switch w/B8 | - |
B8 | A/C Switch | A/C Switch | A/C Switch w/B7 | A/C Switch |
B9 | - | - | - | Brake Switch |
B10 | - | - | Crank Angle Sensor | Crank Angle Sensor |
B11 | Shift Position Sensor (AT Only) | Shift Position Sensor (AT Only) | Clutch Switch (HF Only) | Rear Defogger Switch |
B12 | - | - | Crank Angle Sensor | Crank Angle Sensor |
B13 | No.2 Fuse (10A) | No.2 Fuse (10A) | No.2 Fuse (10A) | No.2 Fuse (10A) |
B14 | Alternator | Alternator | Alternator | Alternator |
B15 | Igniter Unit w/B17 | Igniter Unit w/B17 | Igniter Unit w/B17 | Igniter Unit w/B17 |
B16 | Speed Sensor | Speed Sensor | Speed Sensor | Speed Sensor (Electrical) |
B17 | Igniter Unit w/B15 | Igniter Unit w/B15 | Igniter Unit w/B15 | Igniter Unit w/B15 |
B18 | - | - | - | - |
B19 | ELD | ELD | ELD | Knock Sensor |
B20 | Ign. Timing Adj. Connector | Ign. Timing Adj. Connector | Ign. Timing Adj. Connector | Ign. Timing Adj. Connector |
C1 | Crank Angle Sensor | Crank Angle Sensor | Cylinder Position Sensor | Cylinder Position Sensor |
C2 | Crank Angle Sensor | Crank Angle Sensor | Cylinder Position Sensor | Cylinder Position Sensor |
C3 | TDC Sensor | TDC Sensor | TDC Sensor | TDC Sensor |
C4 | TDC Sensor | TDC Sensor | TDC Sensor | TDC Sensor |
C5 | TA Sensor | TA Sensor | TA Sensor | TA Sensor |
C6 | TW Sensor | TW Sensor | TW Sensor | TW Sensor |
C7 | Throttle Angle Sensor | Throttle Angle Sensor | Throttle Angle Sensor | Throttle Angle Sensor |
C8 | - | EGR Valve Lift Sensor (CA A/T Only) | - | O2 Sensor B |
C9 | PA Sensor | PA Sensor | PA Sensor | P/S oil switch |
C10 | Brake Switch | Brake Switch | Brake and Reverse Light Switch (HF Only) | Brake Switch |
C11 | MAP Sensor | MAP Sensor | MAP Sensor | MAP Sensor |
C12 | PA Sensor | PA Sensor | Throttle Angle Sensor | Throttle Angle Sensor |
C13 | PA Sensor | PA Sensor | Throttle Angle Sensor | Throttle Angle Sensor |
C14 | MAP Sensor | MAP Sensor | MAP Sensor | MAP Sensor |
C15 | MAP Sensor | MAP Sensor | MAP Sensor | MAP Sensor |
C16 | O2 Sensor A | O2 Sensor A | O2 Sensor A | O2 Sensor A |
OBD 1 and OBD 2
OBD2a | OBD2b | Function | OBD1 | Color | Notes |
---|---|---|---|---|---|
A01 | B05 | Injector 4 | A02 | Yellow | |
A02 | B04 | Injector 3 | A05 | Light Blue | |
A03 | B03 | Injector 2 | A03 | Red | |
A04 | B11 | Injector 1 | A01 | Brown | |
A05 | A08 | SO2H | No connection on OBD1 | ||
A06 | C01 | PO2H | A06 | Orange/black | |
A08 | B12 | VTS | A04 | Orange/White | |
A09 | B20 | LG1 | A26 | Black/Red | |
A10 | B02 | PG1 | A23 | Black | |
A11 | B01 | IGP1 | A25 | Yellow/Black | |
A12 | B23 | IACV | A09 | Green/White | |
A15 | A06 | PCS | A20 | Red | |
A16 | A16 | FLR | A07 | Green/Yellow | |
A17 | A17 | ACC | A15 | Black/Red | |
A18 | A18 | MIL | A13 | Green/Orange | |
A19 | A02 | ALTC | A16 | White/Yellow | No connection on D16Y8 P2Nb |
A20 | B13 | ICM | A21 | Red/Green | |
A22 | B22 | LG2 | B02 | Brown | |
A23 | B10 | PG2 | A24 | Black | |
A24 | B09 | ICP2 | B01 | Yellow Black | |
A27 | A20 | FANC | A12 | Yellow/Green | |
C01 | C31 | CKFP | No connection on OBD1 | ||
C02 | C08 | CKPP | B15 | Blue/Green | |
C03 | C20 | TDCP | B13 | Orange/Blue | |
C04 | C29 | CYPP | B11 | Orange | |
C05 | A27 | ACS | B05 | Blue/Red | |
C06 | A24 | STS | B09 | Blue/White | |
C07 | A10 | SCS | D04 | Brown | |
C10 | B21 | VBU | D01 | White/Blue | |
C11 | C22 | CKFM | No connection on OBD1 | ||
C12 | C09 | CKPM | B16 | Blue/Yellow | |
C13 | C21 | TDCM | B14 | White/Blue | |
C14 | C30 | CYPM | B12 | White | |
C15 | C10 | VTM | D06 | Orange/Green | Connected to VTS on OBD2a |
C16 | A26 | PSW | B08 | Brown/Red | |
C17 | C05 | ALTF | D09 | Pink | No connection on D16Y8 P2Nb |
C18 | C23 | VSS | B10 | Yellow/Blue | |
D01 | C27 | TPS | D11 | Pink/Black | |
D02 | C26 | ECT | D13 | Red/White | |
D03 | C17 | MAP | D17 | Pink/White | |
D04 | C19 | VCC1 | D19 | Yellow/Green | |
D05 | A32 | BKSM | D02 | Greem/White | |
D06 | C03 | KS | D03 | Red/Green | No connection on P08, P28 |
D07 | C16 | PO2S | D14 | White | |
D08 | C25 | IAT | D15 | ||
D10 | C28 | VCC2 | D20 | Yellow/White | |
D11 | C18 | SG2 | D22 | Green/White | |
D12 | C07 | SG1 | D21 | Green/Blue | |
D14 | A23 | SO2S | No connection on OBD1 | ||
D16 | A30 | EL | D10 | Green/Red | No 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 Color | Function | |
---|---|---|---|---|---|
DPFI | - | - | MPFI | - | |
A1 | Yellow 2 | Aux Injector | Brown | #1 Injector | |
A2 | Black 1 | Main Relay/Ground | Black 1 | Main Relay/Ground | |
A3 | Yellow 1 | Aux Injector | Red | #2 Injector | |
A4 | Black 2 | Main Relay/Ground | Black 2 | Main Relay/Ground | |
A5 | Red 2 | Main Injector | Light Blue | #3 Injector | |
A6 | Green | Purge Cut Off Solenoid Valve (Coil) | Green | Purge Cut Off Solenoid Valve (Coil) | |
A7 | Red 1 | Main Injector | Yellow 1 | #4 Injector | |
A8 | Yellow 3 | Sedan LX A/T | |||
A10 | Red | EGR Solenoid Control Valve (Coil) (A/T only) | |||
A11 | Blue/Yellow | EACV (Coil) | Blue/Yellow | EACV (Coil) | |
A12 | Green/Black 2 | Main Relay | Green/Black 2 | Main Relay | |
A13 | Yellow/Black 2 | Main Relay | Yellow/Black 2 | Main Relay/Injector Resistor Box | |
A14 | Green/Black 1 | Main Relay | Green/Black 1 | Main Relay | |
A15 | Yellow/Black 1 | Main Relay | Yellow/Black 1 | Main Relay/Injector Resistor Box | |
A16 | Brown/Black | Ground | Brown/Black | Ground | |
A17 | |||||
A18 | Black/Red | Ground | Black/Red | Ground | |
B1 | White/Green | Hazard Fuse | White/Green | Hazard Fuse | |
B2 | Orange | Tandem Control Solenoid Valve | Blue 1 | Fast Idle Control Solenoid Valve | |
B3 | Yellow | A/C Clutch Relay | Yellow | A/C Clutch Relay | |
B4 | Yellow/Green | Radiator Fan Relay | Yellow/Green | Radiator Fan Relay | |
B5 | White/Yellow | Alternator | White/Yellow | Alternator | |
B6 | Green/Orange | Check Engine Warning Light | Green/Orange | Check Engine Warning Light | |
B7 | Green/Orange | A/T Shift Position Console Switch (Park, Neutral) | |||
B8 | Blue/Red | A/C Switch | Blue/Red | A/C Switch | |
B9 | |||||
B10 | Orange | Crank Angle Sensor | |||
B11 | Green/Black | A/T Shift Position Console Switch (Drive) | |||
B12 | White | Crank Angle Sensor | |||
B13 | Blue White | Main Relay | Blue White | Main Relay | |
B14 | Blue 2 | To Yellow, To Alternator | Blue 2 | Alternator | |
B15 | White 1 | Ignitor Unit | White 1 | Ignitor Unit | |
B16 | Yellow/Red | Speed Sensor | Yellow/Red | Speed Sensor | |
B17 | White 2 | Ignitor Unit | White 2 | Ignitor Unit | |
B18 | |||||
B19 | Green/Red | Electric Load Detector | Green/Red | Electric Load Detector | |
B20 | Brown | Ignition Timing Adjusting Connector | Brown | Ignition Timing Adjusting Connector | |
C1 | Orange | Crank Angle Sensor | Blue/Green | Cylinder Position Sensor | |
C2 | White 4 | Crank Angle Sensor | Blue/Yellow | Cylinder Position Sensor | |
C3 | Orange/Blue | TDC Sensor | Orange/Blue | TDC Sensor | |
C4 | White/Blue | TDC Sensor | White/Blue | TDC Sensor | |
C5 | Red/Yellow | TA Sensor | Red/Yellow | TA Sensor | |
C6 | Red/White 1 | TW Sensor | Red/White 1 | TW Sensor | |
C7 | Red/Blue | Throttle (Position) Angle Sensor (TPS) | Red/Blue | Throttle (Position) Angle Sensor (TPS) | |
C8 | Yellow | EGR Lift Valve Sensor | |||
C9 | Red/White 2 | PA Sensor | Red/White 2 | PA Sensor | |
C10 | Green/White 3 | Brake Switch | Green/White 3 | Brake Switch | |
C11 | White 1 | MAP Sensor | White 1 | MAP Sensor | |
C12 | Green/White 2 | EGR Lift Valve Sensor/Pa Sensor/Ignition Timing Adjusting Connector/TA Sensor/TPS Sensor/TW Sensor | Green White 2 | Pa Sensor/Ignition Timing Adjusting Connector/TA Sensor/TPS Sensor/TW Sensor | |
C13 | Yellow/White | EGR Lift Valve Sensor/Pa Sensor/TPS Sensor | Yellow/White | Pa Sensor/TPS Sensor | |
C14 | Green/White 1 | MAP Sensor | Green/White 1 | MAP Sensor | |
C15 | Yellow/Red | MAP Sensor | Yellow/Red | MAP Sensor | |
C16 | White 3 | O2 Sensor | White 3 | O2 Sensor |
All OBD0, OBD1, and OBD2 as well as DPFI to MPFI conversion charts are available for offline viewing/printing in the following spreadsheet.
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