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OBD2 ECU Pinouts for Honda: A Detailed Guide

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Understanding your Honda’s Obd2 Ecu Pinouts is crucial for diagnostics, repairs, and performance tuning. This guide provides comprehensive pinout diagrams for OBD2A and OBD2B Electronic Control Units (ECUs) found in various Honda models, including Civic, Del Sol, and Integra. Whether you are troubleshooting engine issues or upgrading your ECU, having accurate pinout information is essential.

OBD2A ECU Pinouts (96-98 CIVIC/DEL SOL/INTEGRA)

The OBD2A ECU, used in 1996-1998 Honda Civic, Del Sol, and Integra models, consists of three connectors: A, C, and D. Below are the detailed pinouts for each connector.

CONNECTOR “A”

This connector houses various control signals, including injector controls, oxygen sensor heater controls, and solenoid valve controls.

OBD2A ECU Connector A pinout diagram detailing pin assignments for Honda Civic, Del Sol, and Integra models from 1996-1998.

  1. Injector 4 – Yellow
  2. Injector 3 – Blue
  3. Injector 2 – Blue
  4. Injector 1 – Brown
  5. S02SHTC (Secondary 02 Sensor Heater Control) – Black/White
  6. P02SHTC (Primary 02 Sensor Heater Control) – Black/White
  7. ESOL E-EGR (EGR Control Solenoid Valve) * (Civic ONLY) – Color ?
  8. VTS (VTEC Solenoid) – Green/Yellow
  9. LG1 (Logic Ground) – Brown/Black
  10. PG1 (Power Ground) – Black
  11. IGP1 (Power Source) – Yellow/Black
  12. IACV (Idle Air Control Valve) – Black/Blue
  13. Empty Slot
  14. Empty Slot
  15. PCS (Evap Purge Control Solenoid Valve) – Red
  16. FLR (Fuel Pump Relay) – (Civic Green/Yellow) (Integra Green/Blue)
  17. ACC (A/C Controller) – Black/Red
  18. MIL (Malfunction Indicator Light) – Green/Orange
  19. ALTC (Alternator Control) – White/Green
  20. ICM (Ignition Control Module) – Yellow/Green
  21. Empty Slot
  22. LG2 (Logic Ground) – Brown/Black
  23. PG2 (Power Ground) – Black
  24. IGP2 (Power Source) – Yellow/Black
  25. Empty Slot
  26. Empty Slot
  27. FANC (Radiator Fan Control) – Green
  28. 2WBS (Evap Bypass Solenoid Valve) – Blue
  29. VSV (Evap Control Canister Vent Shut Valve) – (Civic Light Green/White) (Integra Light Green)
  30. SLU (Brake Lock) *A/T Civic ONLY – White/Red
  31. Empty Slot
  32. Empty Slot

CONNECTOR “C”

Connector C is primarily focused on sensor inputs and diagnostic signals, including crankshaft and camshaft position sensors, and OBD2 scan tool interface.

Pin configuration for OBD2A ECU Connector C, highlighting sensor and diagnostic connections in 1996-1998 Honda vehicles.

  1. CKF P (CKF Sensor P-side) – Blue/Red
  2. CKF P (CKF Sensor P-side) – Blue
  3. TDC P (TDC Sensor P-side) – Green
  4. CYP P (CYP Sensor P-side) – Yellow
  5. ACS (A/C Switch Signal) – Blue/Red
  6. STS (Starter Signal Switch) – (Civic Blue/Orange) (Integra Blue/White)
  7. SCS (Service Check Signal) – (Civic Brown) (Integra Brown/White)
  8. K-Line (OBD2 Scan Tool Signal) – (Civic Main Relay Ground Black 1) (Integra Green/White)
  9. TMA/FAS (A/T TCM related) – (Civic Grey) (Integra Yellow)
  10. VBU (Voltage Backup) – White/Blue
  11. CKF M (CYP Ground) – White/Red
  12. CKP M (CKP Ground) – (Civic White) (Integra Blue/Yellow)
  13. TDC M (TDC Ground) – (Civic Red) (Integra White/Blue)
  14. CYP M (CYP Ground) – (Civic Black) (Integra White)
  15. VTM (VTEC Pressure Switch) – Blue/Black
  16. PSPSW (Power Steering Switch Signal) – Green
  17. ALTF (Alternator FR Signal) – White/Red
  18. VSS (Vehicle Speed Sensor) – (Civic Blue/White) (Integra Orange)
  19. AT CHK (Detects TCM Signal *Integra ONLY) – Blue
  20. Empty Slot
  21. BARO OUT (Barometric Sensor Output) *Integra ONLY – Light Green
  22. Empty Slot
  23. IP+ (HO2S Pump Cell) *Civic ONLY – Black
  24. IP VS (HO2S Common) *Civic ONLY – Red
  25. VS+ (VS Cell Voltage) *Civic ONLY – White
  26. Empty Slot
  27. AFSA (A/T TCM Related) *Integra ONLY – Grey
  28. AFSA (A/T TCM Related) *Integra ONLY – Green/Blue
  29. ATP/NP/CLSW A/T Park + Neutral or Clutch Switch – (A/T Civic Green), (M/T Civic Red), (A/T Integra Green)
  30. TMB (A/T Related to TCM) *Civic ONLY – Pink
  31. Empty Slot

CONNECTOR “D”

Connector D is dedicated to various engine sensors such as Throttle Position Sensor (TPS), Engine Coolant Temperature (ECT) sensor, and Manifold Absolute Pressure (MAP) sensor.

OBD2A ECU Connector D pinout chart showing connections for engine sensors like TPS, ECT, and MAP in 1996-1998 Honda models.

  1. TPS (Throttle Position Sensor) – Red/Black
  2. ECT (Engine Coolant Temp Sensor) – Red/White
  3. MAP (Manifold Absolute Pressure Sensor) – (Civic Red/Green) (Integra White/Yellow)
  4. VCC1 (Sensor Voltage for MAP) – (Civic Yellow/Red) (Integra Yellow/White)
  5. BKSW (Brake Switch) – Green/White
  6. KS (Knock Sensor) – Red/Blue
  7. PHO2S (Primary Heated O2 Sensor 1) – White
  8. IAT (Intake Air Temp) – Red/Yellow
  9. EGRL (EGR Valve Lift Sensor) *Civic ONLY – White/Black
  10. VCC2 (Sensor Voltage) – Yellow/Blue
  11. SG2 (Sensor Ground) – (Civic Green/Black) (Integra Green/Blue)
  12. SG1 (Sensor Ground) – Green/White
  13. SHO2/SG (Secondary Heated O2 Sensor Ground) – (D16Y7 Red/Yellow), (D16Y8 Green/Black), (Integra Orange/Blue)
  14. SHO2S (Secondary Heated O2 Sensor 2) – (Civic White/Red) (Integra Blue/Red)
  15. PTANK (Fuel Tank Pressure Sensor) – Light Green
  16. EL (ELD) (Electric Load Detector) – Green/Red

OBD2B ECU Pinouts (99-00 CIVIC/INTEGRA)

The OBD2B ECU was implemented in 1999-2000 Honda Civic and Integra models. It uses three connectors: A, B, and C. The following are the pinout details for each connector.

CONNECTOR “A”

OBD2B Connector A includes signals for EVAP system controls, oxygen sensor heater, and various switches and indicators.

OBD2B ECU Connector A pinout diagram for 1999-2000 Honda Civic and Integra, showing EVAP system and sensor heater connections.

  1. Empty Slot
  2. Empty Slot
  3. 2WBS (EVAP Bypass Solenoid Valve) – Blue
  4. VSV (EVAP Control Canister Vent Shut Valve) – Light Green/White
  5. CRS (Cruise Control Signal) – Blue/Green
  6. PCS (EVAP Purge Control Solenoid Valve) – Red/Yellow
  7. ATPD (A/T Gear Position Switch) – Yellow
  8. SO2SHTC (Second O2 Sensor Heater Control) – Black/White
  9. ATPNP (A/T Gear Position Switch) – Light Green
  10. SCS (Service Check Signal) – Brown
  11. Empty Slot
  12. Empty Slot
  13. Empty Slot
  14. D4IND (A/T D4 Indicator) – Green/Black
  15. Empty Slot (Civic Plug) Integra FLR (Fuel Pump Relay) – Green/Yellow
  16. Empty Slot (Integra Plug) Civic FLR (Fuel Pump Relay) – Green/Yellow
  17. ACC (A/C Clutch Relay) – Black/Red
  18. MIL (Malfunction Indicator Light) – Green/Orange
  19. NEP (Engine Speed Pulse) – Blue
  20. FANC (Radiator Fan Control) – Green
  21. K-Line (OBD2 Scan Tool Signal) – Blue/Yellow
  22. ATP L (A/T Gear Position Switch) – Blue
  23. SHO2S (Secondary Heated O2 Sensor 2) – White/Red
  24. STS (Started Signal Switch) – Green
  25. Empty Slot
  26. PSPSW (Power Steering Power Switch Signal) – Green
  27. ACS (A/C Switch Signal) – Blue/Red
  28. SLU (A/T Brake Related) – White/Red
  29. P TANK (Fuel Tank Pressure) – Light Green
  30. EL (ELD) (Electrical Load Detector) – Green/Red

CONNECTOR “B”

OBD2B Connector B is responsible for power and ground distribution, injector controls, and Idle Air Control Valve (IACV) management.

Pin assignments for OBD2B ECU Connector B, including power, ground, injector, and IACV controls for 1999-2000 Honda Civic/Integra.

  1. IGP1 (Power Source) – Yellow/Black
  2. PG1 (Power Ground) – Black
  3. INJ2 (Injector 2) – Red
  4. INJ3 (Injector 3) – Blue
  5. INJ4 (Injector 4) – Yellow
  6. IACVP (IACV Position Side) *Civic ONLY – Black/Blue
  7. ES (ESOL) (EGR Control Solenoid Valve) – Red
  8. LS (HLC LSM) (CVT Transmission Related) – Pink/Black
  9. IGP2 (Power Source) – Yellow/Black
  10. PG2 (Power Ground) – Black
  11. INJ1 (Injector 1) – Black
  12. VTS (VTEC Solenoid) – Green/Yellow
  13. ICM (Ignition Control Module) – Yellow/Green
  14. Empty Slot Green/Red
  15. IACVN (IACV Negative Side) *Civic ONLY – Orange
  16. IAB (Intake Air Bypass Control Solenoid Valve) *GSR ONLY – Color ?
  17. LS+HLC LSM (A/T CVT Transmission Related) – (D16Y7 Red) (D16Y5 Green/White)
  18. SC LSM (CVT Transmission Related) – Pink/Blue
  19. Empty Slot
  20. LG1 (Logic Ground) – Brown/Black
  21. VBU (Voltage Backup) – White/Blue
  22. LG2 (Logic Ground) – Brown/Black
  23. IACV (Idle Air Control Valve) – Black/Blue
  24. Empty Slot
  25. SC LSP (CVT Transmission Related) – Yellow

CONNECTOR “C”

OBD2B Connector C handles primary sensor inputs like oxygen sensor heater control, knock sensor, and various engine position and temperature sensors.

OBD2B ECU Connector C pinout diagram showing sensor connections including O2 sensor, knock sensor, and temperature sensors for 1999-2000 Honda models.

  1. PO2SHTC (Primary O2 Sensor Heater Control) – Black/White
  2. ALTC (Alternator Control) – White/Green
  3. KS (Knock Sensor) – Red/Blue
  4. Empty Slot
  5. ALTF (Alternator FR Signal) – White/Red
  6. EGRL (EGR Valve Lift Sensor) – White/Black
  7. SG1 (Sensor Ground, Ground for MAP) – Green/White
  8. CKKP (CKP Sensor P-side) – Blue
  9. CKPM (CKP Sensor M-side) – White
  10. VTM (VTEC Pressure Switch) – Blue/Black
  11. Empty Slot
  12. Empty Slot
  13. Empty Slot
  14. Empty Slot
  15. Empty Slot
  16. PHO2S (Primary Heated O2 Sensor 1) – White
  17. MAP (Manifold Absolute Pressure Sensor) – Red/Green
  18. SG2 (Sensor Ground) – Green/Black
  19. VCC1 (Sensor Voltage for MAP) – Yellow/Red
  20. TDCP (TDC Sensor P-side) – Green
  21. TDCM (TDC Sensor M-side) – Red
  22. CKFP (CKF Sensor P-side) – Blue/Red
  23. VSS (Vehicle Speed Sensor) – Blue/White
  24. Empty Slot
  25. IAT (Intake Air Temp) – Red/Yellow
  26. ECT (Engine Coolant Temp Sensor) – Red/White
  27. TPS (Throttle Position Sensor) – Red/Black
  28. VCC2 (Sensor Voltage) – Yellow/Blue
  29. CYPP (CYP Sensor P-side) – Yellow
  30. CYPM (CYP Sensor M-side) – Black
  31. CKFM (CKF Sensor M-side) – White/Red

These OBD2 ECU pinout diagrams are essential for anyone working on Honda vehicles from the OBD2A and OBD2B generations. Always verify the pinouts against your specific vehicle and ECU before conducting any electrical work. Using these diagrams will help ensure accurate diagnostics and modifications, saving time and preventing potential damage.

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