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Honda OBD2 Pinouts: The Definitive Guide for 96-00 Models

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Understanding your Honda’s OBD2 system is crucial for diagnostics, repairs, and performance tuning. This guide provides comprehensive Honda Obd2 Pinouts for OBD2A (1996-1998) and OBD2B (1999-2000) models, covering Civic, Del Sol, and Integra. Whether you’re troubleshooting engine codes or planning an ECU modification, these detailed diagrams will ensure you have the precise information you need.

OBD2A Pinouts (1996-1998 Civic/Del Sol/Integra)

The OBD2A system in Hondas from 1996 to 1998 utilizes a multi-connector setup. Below are the pinouts for Connector A, Connector C, and Connector D.

CONNECTOR “A”

This connector handles a wide array of functions, from injector control to vital engine management signals. Refer to the diagram and pin descriptions below for detailed information.

  1. Injector 4: Yellow wire – Controls the fourth fuel injector.
  2. Injector 3: Blue wire – Controls the third fuel injector.
  3. Injector 2: Blue wire – Controls the second fuel injector.
  4. Injector 1: Brown wire – Controls the first fuel injector.
  5. S02SHTC (Second 02 Sensor Heater Control): Black/White wire – Heater control for the secondary oxygen sensor.
  6. P02SHTC (Primary 02 Sensor Heater Control): Black/White wire – Heater control for the primary oxygen sensor.
  7. ESOL E-EGR (EGR Control Solenoid Valve): (Civic ONLY) (Color uncertain) – Controls the EGR solenoid valve.
  8. VTS (VTEC Solenoid): Green/Yellow wire – Activates the VTEC solenoid for variable valve timing.
  9. LG1 (Logic Ground): Brown/Black wire – Logic ground for various sensors and circuits.
  10. PG1 (Power Ground): Black wire – Power ground connection.
  11. IGP1 (Power Source): Yellow/Black wire – Ignition power source.
  12. IACV (Idle Air Control Valve): Black/Blue wire – Controls the idle air control valve for stable idling.
  13. PCS (Evap Purge Control Solenoid Valve): Red wire – Controls the evaporative emission purge control solenoid valve.
  14. FLR (Fuel Pump Relay): (Civic Green/Yellow) (Integra Green/Blue) – Activates the fuel pump relay.
  15. ACC (A/C Controller): Black/Red wire – Signal to the air conditioning controller.
  16. MIL (Malfunction Indicator Light): Green/Orange wire – Drives the check engine light (MIL).
  17. ALTC (Alternator Control): White/Green wire – Alternator control signal.
  18. ICM (Ignition Control Module): Yellow/Green wire – Signal to the ignition control module.
  19. LG2 (Logic Ground): Brown/Black wire – Additional logic ground.
  20. PG2 (Power Ground): Black wire – Additional power ground.
  21. IGP2 (Power Source): Yellow/Black wire – Additional ignition power source.
  22. FANC (Radiator Fan Control): Green wire – Controls the radiator cooling fan.
  23. 2WBS (Evap Bypass Solenoid Valve): Blue wire – Controls the evaporative emission bypass solenoid valve.
  24. VSV (Evap Control Canister Vent Shut Valve): (Civic Light Green/White) (Integra Light Green) – Controls the evaporative emission canister vent shut valve.
  25. SLU (Brake Lock): A/T Civic ONLY White/Red wire – Brake lock signal for automatic transmission Civics.
  26. Empty Slot: – Not used.
  27. Empty Slot: – Not used.

CONNECTOR “C”

Connector C is essential for sensor inputs and communication with diagnostic tools.

  1. CKF P (CKF Sensor P-side): Blue/Red wire – Crankshaft Fluctuations Sensor positive side.
  2. CKF P (CKF Sensor P-side): Blue wire – Crankshaft Fluctuations Sensor positive side.
  3. TDC P (TDC Sensor P-side): Green wire – Top Dead Center Sensor positive side.
  4. CYP P (CYP Sensor P-side): Yellow wire – Cylinder Position Sensor positive side.
  5. ACS (A/C Switch Signal): Blue/Red wire – Air conditioning switch signal.
  6. STS (Starter Signal Switch): (Civic Blue/Orange) (Integra Blue/White) – Starter signal switch.
  7. SCS (Service Check Signal): (Civic Brown) (Integra Brown/White) – Service check signal, used for diagnostics.
  8. K-Line (OBD2 Scan Tool Signal): (Civic Main Relay Ground Black 1) (Integra Green/White) – Communication line for OBD2 scan tools.
  9. TMA/FAS (A/T TCM related): (Civic Grey) (Integra Yellow) – Automatic Transmission Control Module related signal.
  10. VBU (Voltage Backup): White/Blue wire – Voltage backup for memory functions.
  11. CKF M (CYP Ground): White/Red wire – Crankshaft Fluctuations Sensor ground.
  12. CKP M (CKP Ground): (Civic White) (Integra Blue/Yellow) – Crankshaft Position Sensor ground.
  13. TDC M (TDC Ground): (Civic Red) (Integra White/Blue) – Top Dead Center Sensor ground.
  14. CYP M (CYP Ground): (Civic Black) (Integra White) – Cylinder Position Sensor ground.
  15. VTM (VTEC Pressure Switch): Blue/Black wire – VTEC oil pressure switch signal.
  16. PSPSW (Power Steering Switch Signal): Green wire – Power steering pressure switch signal.
  17. ALTF (Alternator FR Signal): White/Red wire – Alternator field regulator signal.
  18. VSS (Vehicle Speed Sensor): (Civic Blue/White) (Integra Orange) – Vehicle speed sensor signal.
  19. AT CHK (Detects TCM Signal): (Integra ONLY) Blue wire – Automatic Transmission Control Module check signal.
  20. Empty Slot: – Not used.
  21. BARO OUT (Barometric Sensor Output): (Integra ONLY) Light Green wire – Barometric pressure sensor output.
  22. Empty Slot: – Not used.
  23. IP+ (HO2S Pump Cell): (Civic ONLY) Black wire – Heated Oxygen Sensor pump cell current positive.
  24. IP VS (HO2S Common): (Civic ONLY) Red wire – Heated Oxygen Sensor common pump current/voltage sense.
  25. VS+ (VS Cell Voltage): (Civic ONLY) White wire – Heated Oxygen Sensor voltage sense positive.
  26. Empty Slot: – Not used.
  27. AFSA (A/T TCM Related): (Integra ONLY) Grey wire – Automatic Transmission Control Module related signal.
  28. AFSA (A/T TCM Related): (Integra ONLY) Green/Blue wire – Automatic Transmission Control Module related signal.
  29. ATP/NP/CLSW A/T Park + Neutral or Clutch Switch: (A/T Civic Green), (M/T Civic Red), (A/T Integra Green) – Automatic Transmission Park/Neutral Position switch or Manual Transmission Clutch switch.
  30. TMB (A/T Related to TCM): (Civic ONLY) Pink wire – Automatic Transmission Control Module related signal.
  31. Empty Slot: – Not used.

CONNECTOR “D”

Connector D focuses on sensor inputs related to air and fuel management.

  1. TPS (Throttle Position Sensor): Red/Black wire – Throttle position sensor signal.
  2. ECT (Engine Coolant Temp Sensor): Red/White wire – Engine coolant temperature sensor signal.
  3. MAP (Manifold Absolute Pressure Sensor): (Civic Red/Green) (Integra White/Yellow) – Manifold absolute pressure sensor signal.
  4. VCC1 (Sensor Voltage for MAP): (Civic Yellow/Red) (Integra Yellow/White) – 5V reference voltage for the MAP sensor.
  5. BKSW (Brake Switch): Green/White wire – Brake switch signal.
  6. KS (Knock Sensor): Red/Blue wire – Knock sensor signal.
  7. PHO2S (Primary Heated O2 Sensor 1): White wire – Primary heated oxygen sensor signal.
  8. IAT (Intake Air Temp): Red/Yellow wire – Intake air temperature sensor signal.
  9. EGRL (EGR Valve Lift Sensor): (Civic ONLY) White/Black wire – EGR valve lift sensor signal.
  10. VCC2 (Sensor Voltage): Yellow/Blue wire – 5V reference voltage for various sensors.
  11. SG2 (Sensor Ground): (Civic Green/Black) (Integra Green/Blue) – Sensor ground.
  12. SG1 (Sensor Ground): Green/White wire – Sensor ground.
  13. SHO2/SG (Secondary Heated O2 Sensor Ground): (D16Y7 Red/Yellow), (D16Y8 Green/Black), (Integra Orange/Blue) – Secondary heated oxygen sensor ground.
  14. SHO2S (Secondary Heated O2 Sensor 2): (Civic White/Red) (Integra Blue/Red) – Secondary heated oxygen sensor signal.
  15. PTANK (Fuel Tank Pressure Sensor): Light Green wire – Fuel tank pressure sensor signal.
  16. EL (ELD – Electric Load Detector): Green/Red wire – Electric load detector signal.

OBD2B Pinouts (1999-2000 Civic/Integra)

For 1999 and 2000 Honda models, the OBD2B system was implemented. Here are the pinouts for Connector A, Connector B, and Connector C of the OBD2B system.

CONNECTOR “A”

OBD2B Connector A handles emissions control, air conditioning, and some transmission related signals.

  1. Empty Slot: – Not used.
  2. Empty Slot: – Not used.
  3. 2WBS (EVAP Bypass Solenoid Valve): Blue wire – Evaporative emission bypass solenoid valve control.
  4. VSV (EVAP Control Canister Vent Shut Valve): Light Green/White wire – Evaporative emission canister vent shut valve control.
  5. CRS (Cruise Control Signal): Blue/Green wire – Cruise control system signal.
  6. PCS (EVAP Purge Control Solenoid Valve): Red/Yellow wire – Evaporative emission purge control solenoid valve control.
  7. ATPD (A/T Gear Position Switch): Yellow wire – Automatic transmission gear position switch signal.
  8. SO2SHTC (Second O2 Sensor Heater Control): Black/White wire – Secondary oxygen sensor heater control.
  9. ATPNP (A/T Gear Position Switch): Light Green wire – Automatic transmission gear position switch signal.
  10. SCS (Service Check Signal): Brown wire – Service check signal for diagnostics.
  11. Empty Slot: – Not used.
  12. Empty Slot: – Not used.
  13. Empty Slot: – Not used.
  14. D4IND (A/T D4 Indicator): Green/Black wire – Automatic transmission D4 indicator signal.
  15. Empty Slot (Civic Plug) Integra FLR (Fuel Pump Relay): Green/Yellow wire – Fuel pump relay activation, Integra specific in this slot.
  16. Empty Slot (Integra Plug) Civic FLR (Fuel Pump Relay): Green/Yellow wire – Fuel pump relay activation, Civic specific in this slot.
  17. ACC (A/C Clutch Relay): Black/Red wire – Air conditioning clutch relay control.
  18. MIL (Malfunction Indicator Light): Green/Orange wire – Malfunction indicator light (check engine light) control.
  19. NEP (Engine Speed Pulse): Blue wire – Engine speed pulse signal.
  20. FANC (Radiator Fan Control): Green wire – Radiator cooling fan control.
  21. K-Line (OBD2 Scan Tool Signal): Blue/Yellow wire – Communication line for OBD2 scan tools.
  22. ATPL (A/T Gear Position Switch): Blue wire – Automatic transmission gear position switch signal.
  23. SHO2S (Secondary Heated O2 Sensor 2): White/Red wire – Secondary heated oxygen sensor signal.
  24. STS (Started Signal Switch): Green wire – Starter signal switch.
  25. Empty Slot: – Not used.
  26. PSPSW (Power Steering Power Switch Signal): Green wire – Power steering pressure switch signal.
  27. ACS (A/C Switch Signal): Blue/Red wire – Air conditioning switch signal.
  28. SLU (A/T Brake Related): White/Red wire – Automatic transmission brake related signal.
  29. P TANK (Fuel Tank Pressure): Light Green wire – Fuel tank pressure sensor signal.
  30. EL (ELD) (Electrical Load Detector): Green/Red wire – Electrical load detector signal.

CONNECTOR “B”

Connector B in OBD2B systems manages injectors, ignition, and idle control, among other engine functions.

  1. IGP1 (Power Source): Yellow/Black wire – Ignition power source.
  2. PG1 (Power Ground): Black wire – Power ground connection.
  3. INJ2 (Injector 2): Red wire – Controls the second fuel injector.
  4. INJ3 (Injector 3): Blue wire – Controls the third fuel injector.
  5. INJ4 (Injector 4): Yellow wire – Controls the fourth fuel injector.
  6. IACVP (IACV Position Side): (Civic ONLY) Black/Blue wire – Idle Air Control Valve position side.
  7. ES (ESOL) (EGR Control Solenoid Valve): Red wire – EGR control solenoid valve.
  8. LS (HLC LSM) (CVT Transmission Related): Pink/Black wire – CVT Transmission related signal.
  9. IGP2 (Power Source): Yellow/Black wire – Ignition power source.
  10. PG2 (Power Ground): Black wire – Power ground connection.
  11. INJ1 (Injector 1): Black wire – Controls the first fuel injector.
  12. VTS (VTEC Solenoid): Green/Yellow wire – VTEC solenoid activation.
  13. ICM (Ignition Control Module): Yellow/Green wire – Ignition control module signal.
  14. Empty Slot: Green/Red wire – Not used.
  15. IACVN (IACV Negative Side): (Civic ONLY) Orange wire – Idle Air Control Valve negative side.
  16. IAB (Intake Air Bypass Control Solenoid Valve): (GSR ONLY) (Color uncertain) – Intake air bypass control solenoid valve.
  17. LS+HLC LSM (A/T CVT Transmission Related): (D16Y7 Red) (D16Y5 Green/White) – CVT Transmission related signal.
  18. SC LSM (CVT Transmission Related): Pink/Blue wire – CVT Transmission related signal.
  19. Empty Slot: – Not used.
  20. LG1 (Logic Ground): Brown/Black wire – Logic ground.
  21. VBU (Voltage Backup): White/Blue wire – Voltage backup for memory functions.
  22. LG2 (Logic Ground): Brown/Black wire – Logic ground.
  23. IACV (Idle Air Control Valve): Black/Blue wire – Idle Air Control Valve control.
  24. Empty Slot: – Not used.
  25. SC LSP (CVT Transmission Related): Yellow wire – CVT Transmission related signal.

CONNECTOR “C”

OBD2B Connector C is primarily dedicated to sensor inputs and alternator control.

  1. PO2SHTC (Primary O2 Sensor Heater Control): Black/White wire – Primary oxygen sensor heater control.
  2. ALTC (Alternator Control): White/Green wire – Alternator control signal.
  3. KS (Knock Sensor): Red/Blue wire – Knock sensor signal.
  4. Empty Slot: – Not used.
  5. ALTF (Alternator FR Signal): White/Red wire – Alternator field regulator signal.
  6. EGRL (EGR Valve Lift Sensor): White/Black wire – EGR valve lift sensor signal.
  7. SG1 (Sensor Ground, Ground for MAP): Green/White wire – Sensor ground, specifically for the MAP sensor.
  8. CKKP (CKP Sensor P-side): Blue wire – Crankshaft Position Sensor positive side.
  9. CKPM (CKP Sensor M-side): White wire – Crankshaft Position Sensor ground side.
  10. VTM (VTEC Pressure Switch): Blue/Black wire – VTEC oil pressure switch signal.
  11. Empty Slot: – Not used.
  12. Empty Slot: – Not used.
  13. Empty Slot: – Not used.
  14. Empty Slot: – Not used.
  15. Empty Slot: – Not used.
  16. PHO2S (Primary Heated O2 Sensor 1): White wire – Primary heated oxygen sensor signal.
  17. MAP (Manifold Absolute Pressure Sensor): Red/Green wire – Manifold absolute pressure sensor signal.
  18. SG2 (Sensor Ground): Green/Black wire – Sensor ground.
  19. VCC1 (Sensor Voltage for MAP): Yellow/Red wire – 5V reference voltage for the MAP sensor.
  20. TDCP (TDC Sensor P-side): Green wire – Top Dead Center Sensor positive side.
  21. TDCM (TDC Sensor M-side): Red wire – Top Dead Center Sensor ground side.
  22. CKFP (CKF Sensor P-side): Blue/Red wire – Crankshaft Fluctuations Sensor positive side.
  23. VSS (Vehicle Speed Sensor): Blue/White wire – Vehicle speed sensor signal.
  24. Empty Slot: – Not used.
  25. IAT (Intake Air Temp): Red/Yellow wire – Intake air temperature sensor signal.
  26. ECT (Engine Coolant Temp Sensor): Red/White wire – Engine coolant temperature sensor signal.
  27. TPS (Throttle Position Sensor): Red/Black wire – Throttle position sensor signal.
  28. VCC2 (Sensor Voltage): Yellow/Blue wire – 5V reference voltage for sensors.
  29. CYPP (CYP Sensor P-side): Yellow wire – Cylinder Position Sensor positive side.
  30. CYPM (CYP Sensor M-side): Black wire – Cylinder Position Sensor ground side.
  31. CKFM (CKF Sensor M-side): White/Red wire – Crankshaft Fluctuations Sensor ground side.

Note: These pinouts are for reference and informational purposes. Always consult your vehicle’s repair manual and wiring diagrams for specific troubleshooting and repair procedures. Working with automotive electrical systems requires caution and expertise.

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