Honda / Acura Pin Outs - OBD0 / OBD1 / OBD2 Pin Non-OBD PR3/PWO Ecu Non-OBD PR4 ECU OBD-1 PR4 ECU OBD-1 P61 ECU OBD-1 P72 ECU OBD-2 P72 ECU OBD-2 P73 ECU A1 #1 Injector #1 Injector #1 Injector #1 Injector #1 Injector #4 Injector #4 Injector A2 Ground Ground #4 Injector #4 Injector #4 Injector #3 Injector #3 Injector A3 #2 Injector #2 Injector #2 Injector #2 Injector #2 Injector #2 Injector #2 Injector A4 Ground Ground - VTEC Spool Solenoid Valve VTEC Spool Solenoid Valve #1 Injector #1 Injector A5 #3 Injector #3 Injector #3 Injector #3 Injector #3 Injector Second O2 Sensor Heat Control Second O2 Sensor Heat Control A6 Ground Ground O2 Sensor Heat Control O2 Sensor Heat Control O2 Sensor Heat Control Primary O2 Sensor Heat Control Primary O2 Sensor Heat Control A7 #4 Injector #4 Injector Fuel Pump Relay (FLR1) Fuel Pump Relay (FLR1) Fuel Pump Relay (FLR1) - - A8 VTEC Spool Solenoid Valve - Fuel Pump Relay (FLR2) Fuel Pump Relay (FLR2) Fuel Pump Relay (FLR2) VTEC Spool Solenoid Valve VTEC Spool Solenoid Valve A9 - - EACV EACV EACV Logic Ground (LG1) Logic Ground (LG1) A10 Pressure Regulator Cutt-off Solenoid Valve Pressure Regulator Cutt-off Solenoid Valve Pressure Regulator Cut-off Solenoid Valve - - Power Ground (PG1) Power Ground (PG1) A11 EACV EACV - - - Power Source (IGP1) Power Source (IGP1) A12 Main Relay Main Relay - - - Idle Air Control Valve (IACV) Idle Air Control Valve (IACV) A13 Main Relay Main Relay Check Engine Light (MIL) Check Engine Light (MIL) Check Engine Light (MIL) - - A14 Main Relay Main Relay - - - - - A15 Main Relay Main Relay A/C Clutch Relay A/C Clutch Relay A/C Clutch Relay Evap. Purge Control Solenoid Valve (PCS) Evap. Purge Control Solenoid Valve (PCS) A16 Ground Ground - - - Fuel Pump Relay (FLR) Fuel Pump Relay (FLR) A17 - - - - - A/C Clutch Relay A/C Clutch Relay A18 Ground Ground - - - Check Engine Light (MIL) Check Engine Light (MIL) A19 - - - - - Alternator Control (ALTC) Alternator Control (ALTC) A20 - - - Purge Control Solenoid Valve Purge Control Solenoid Valve Ignition Control Module (ICM) Ignition Control Module (ICM) A21 - - Ignitor Power Source (IGP1) Ignitor Power Source (IGP1) Ignitor Power Source (IGP1) - - A22 - - Ignitor Power Source (IGP2) Ignitor Power Source (IGP2) Ignitor Power Source (IGP2) Logic Ground (LG2) Logic Ground (LG2) A23 - - Power Ground (PG1) Power Ground (PG1) Power Ground (PG1) Power Ground (PG2) Power Ground (PG2) A24 - - Power Ground (PG2) Power Ground (PG2) Power Ground (PG2) Power Source (IGP2) Power Source (IGP2) A25 - - Main Relay IGP1(IG Power) Main Relay IGP1(IG Power) Main Relay IGP1(IG Power) Reference Voltage (VREF) Reference Voltage (VREF) A26 - - Logic Ground (LG1) Logic Ground (LG1) Logic Ground (LG1) Intake Air Bypass Control Solenoid Valve (IAB) Intake Air Bypass Control Solenoid Valve (IAB) A27 - - - - - Radiator Fan Control (FANC) Radiator Fan Control (FANC) B1 Ignition Switch Ignition Switch Power Source (IGP2) Power Source (IGP2) Power Source (IGP2) - - B2 - - Logic Ground (LG2) Logic Ground (LG2) Logic Ground (LG2) - - B3 A/C Clutch Relay A/C Clutch Relay - - - - - B4 - - Service Check Connector Service Check Connector Service Check Connector - - B5 VTEC Pressure Switch - A/C Switch (ACS) A/C Switch (ACS) A/C Switch (ACS) - - B6 Check Engine Light Check Engine Light - - - - - B7 - - - - - - - B8 A/C Switch (ACS) A/C Switch (ACS) P/S Oil Pressure Switch P/S Oil Pressure Switch P/S Oil Pressure Switch - - B9 - - Starter Switch Signal (STS) Starter Switch Signal (STS) Starter Switch Signal (STS) - - B10 Crank Angle Sensor Crank Angle Sensor Speed Sensor Speed Sensor Speed Sensor - - B11 Rear Defogger Switch - Cyl. Sensor Cyl. Sensor Cyl. Sensor - - B12 Crank Angle Sensor Crank Angle Sensor Cyl. Sensor Cyl. Sensor Cyl. Sensor - - B13 Ignition Switch Ignition Switch TDC Sensor TDC Sensor TDC Sensor - - B14 Alternator Alternator TDC Sensor TDC Sensor TDC Sensor - - B15 Igniter Igniter Crank Angle Sensor Crank Angle Sensor Crank Angle Sensor - - B16 Speed Sensor Speed Sensor Crank Sensor Crank Sensor Crank Sensor - - B17 Igniter Igniter - - - - - B18 - - - - - - - B19 Knock Sensor P/S Oil Pressure Switch - - - - - B20 Ignition Timing Adjusting Connector Ignition Timing Adjusting Connector - - - - - C1 Cyliner Position Sensor Cyliner Position Sensor - - - CKF Sensor (CKF-P) CKF Sensor (CKF-P) C2 Cyliner Position Sensor Cyliner Position Sensor - - - CKP Sensor (CKP-P) CKP Sensor (CKP-P) C3 TDC Sensor TDC Sensor - - - TDC Sensor (TDC-P) TDC Sensor (TDC-P) C4 TDC Sensor TDC Sensor - - - CYP Sensor (CYP-P) CYP Sensor (CYP-P) C5 Intake Air Temp Sensor Intake Air Temp Sensor - - - A/C Switch (ACS) A/C Switch (ACS) C6 TW Sensor TW Sensor - - - Starter Switch Signal (STS) Starter Switch Signal (STS) C7 Throttle Position Sensor (TPS) Throttle Position Sensor (TPS) - - - Service Check & Ignition Timing Connector (SCS) Service Check & Ignition Timing Connector (SCS) C8 O2 Sensor B - - - - K-Line K-Line C9 P/S Oil Pressure Switch PA Sensor - - - Feedback At Signal (FAS) Feedback At Signal (FAS) C10 Brake Switch Brake Switch - - - Voltage Back Up (VBU) Voltage Back Up (VBU) C11 MAP Sensor MAP Sensor - - - CKF Sensor (CKF-M) CKF Sensor (CKF-M) C12 Ignition Timing Adjusting Connector Ignition Timing Adjusting Connector - - - CKP Sensor (CKP-M) CKP Sensor (CKP-M) C13 Intake Air Temp Sensor Intake Air Temp Sensor - - - TDC Sensor (TDC-M) TDC Sensor (TDC-M) C14 MAP Sensor MAP Sensor - - - CYP Sensor (CYP-M) CYP Sensor (CYP-M) C15 MAP Sensor MAP Sensor - - - VTEC Pressure Switch (VTM) VTEC Pressure Switch (VTM) C16 O2 Sensor A - - - - P/S Oil Pressure Switch P/S Oil Pressure Switch C17 - - - - - Alternator FR Signal (ALTF) Alternator FR Signal (ALTF) C18 - - - - - Vehicle Speed Sensor (VSS) Vehicle Speed Sensor (VSS) C19 - - - - - - - C20 - - - - - - - C21 - - - - - Barometric Sensor Output Signal Barometric Sensor Output Signal C22 - - - - - - - C23 - - - - - - - C24 - - - - - - - C25 - - - - - - - C26 - - - - - - - C27 - - - - - - - C28 - - - - - - - C29 - - - - - - - D1 - - Back Up Fuse Back Up Fuse Back Up Fuse Throttle Postion Sensor (TPS) Throttle Postion Sensor (TPS) D2 - - Brake Switch Brake Switch Brake Switch Engine Coolant Temp. Sensor (ECT) Engine Coolant Temp. Sensor (ECT) D3 - - - Knock Sensor Knock Sensor MAP Sensor MAP Sensor D4 - - Service Check & Ignition Timing Connector (SCS) Service Check & Ignition Timing Connector (SCS) Service Check & Ignition Timing Connector (SCS) Sensor Voltage (VCC1) Sensor Voltage (VCC1) D5 - - - - - Brake Switch Brake Switch D6 - - - VTEC Pressure Switch (VTM) VTEC Pressure Switch (VTM) Knock Sensor Knock Sensor D7 - - Data Link Connector Data Link Connector Data Link Connector Primary O2 Sensor Primary O2 Sensor D8 - - - - - Intake Air Temp. Sensor Intake Air Temp. Sensor D9 - - Alternator Alternator Alternator - - D10 - - - - - Sensor Voltage (VCC2) Sensor Voltage (VCC2) D11 - - Throttle Position Sensor (TPS) Throttle Position Sensor (TPS) Throttle Position Sensor (TPS) Sensor Ground (SG2) Sensor Ground (SG2) D12 - - - - - Sensor Ground (SG1) Sensor Ground (SG1) D13 - - TW Sensor TW Sensor TW Sensor Secondary Heated O2 Sensor Ground Secondary Heated O2 Sensor Ground D14 - - O2 Sensor O2 Sensor O2 Sensor Secondary Heated O2 Sensor Secondary Heated O2 Sensor D15 - - Intake Air Temp. Sensor Intake Air Temp. Sensor Intake Air Temp. Sensor Electric Load Detector (ELD) Electric Load Detector (ELD) D16 - - - - - - - D17 - - MAP Sensor (PB) MAP Sensor (PB) MAP Sensor (PB) - - D18 - - - - - - - D19 - - Sensor Voltage (VCC1) Sensor Voltage (VCC1) Sensor Voltage (VCC1) - - D20 - - Sensor Voltage (VCC2) Sensor Voltage (VCC2) Sensor Voltage (VCC2) - - D21 - - Sensor Ground (SG1) Sensor Ground (SG1) Sensor Ground (SG1) - - D22 - - Sensor Ground (SG2) Sensor Ground (SG2) Sensor Ground (SG2) - -
