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 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