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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

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