ECU Pin Out (HONDA)
Information Source: www.hondaswap.com
OBD1->OBD0 - Function
A01 ->A01 - #1 injector
A02 ->A07 - #4 injector
A03 ->A03 - #2 injector
A04 ->N/C - VTEC solenoid Valve
A05 ->A05 - #3 injector
A06 ->N/C - O2 Sensor Heater Control
A07 ->A12&A14 - Fuel Pump Relay (FLR1)
A08 ->N/C - Fuel Pump Relay (FLR2)
A09 ->A11 - EACV
A10 ->N/C - EGR solenoid valve
A11 ->N/C -
A12 ->N/C -
A13 ->B06 - Check Engine Light (MIL)
A14 ->N/C -
A15 ->B01 - A/C Clutch Relay
A16 ->N/C -
A17 ->N/C -
A18 ->N/C -
A19 ->N/C -
A20 ->B02 - Purge Control Solenoid Valve
A21 ->B15&B17 - Igniter Power Source (IGP1)
A22 ->N/C - Igniter Power Source (IGP2)
A23 ->A02 - Power Ground (PG1)
A24 ->A04 - Power Ground (PG2)
A25 ->A13 - Main Relay IGP1 (IG Power)
A26 ->A18 - Logic Ground (LG1)
A27 ->N/C -
B01 ->A15 - Power Source (IGP2)
B02 ->A16 - Logic Ground (LG2)
B03 ->N/C -
B04 ->N/C - Service Check Connector
B05 ->B08 - A/C Switch (ACS)
B06 ->N/C -
B07 ->N/C -
B08 ->N/C - P/S Pressure Switch
B09 ->B13 - Starter Switch Signal (STS)
B10 ->B16 - Speed Sensor
B11 ->C01 - CYL Sensor
B12 ->C02 - CYL Sensor
B13 ->C03 - TDC Sensor
B14 ->C04 - TDC Sensor
B15 ->B10 - Crank Angle Sensor
B16 ->B12 - Crank Sensor
D01 ->A17 - Back Up Fuse
D02 ->N/C - Brake Switch
D03 ->N/C - Knock Sensor
D04 ->N/C- Service Check & Ignition Timing Connector (SCS)
D05 ->N/C -
D06 ->N/C - VTEC Pressure Switch
D07 ->N/C - Data Link Connector
D08 ->N/C -
D09 ->B14 - Alternator
D10 ->B19 -
D11 ->C07 - Throttle Position Sensor (TPS)
D12 ->N/C -
D13 ->C06 - TW Sensor
D14 ->C16 - O2 Sensor
D15 ->C05 - Intake Air Temperature Sensor
D16 ->N/C -
D17 ->C11 - MAP Sensor
D18 ->N/C -
D19 ->C15 - Sensor Voltage (VCC1)
D20 ->C13 - Sensor Voltage (VCC2)
D21 ->C14 - Sensor Ground (SG1)
D22 ->C12 - Sensor Ground (SG2)
you have to short pin D04 to GND in order to check your CEL codes. btw, this harness has produced no codes in my car, other than the one i was getting before i even installed it.
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
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
