ECU Pin Out (HONDA)
OBD1->OBD0 - Function
A01 ->A01 - #1 injector
A02 ->A07 - #4 injector
A03 ->A03 - #2 injector
A04 ->N/C - VTEC solenoid Valve
A05 ->A05 - #3 injector
A06 ->N/C - O2 Sensor Heater Control
A07 ->A12&A14 - Fuel Pump Relay (FLR1)
A08 ->N/C - Fuel Pump Relay (FLR2)
A09 ->A11 - EACV
A10 ->N/C - EGR solenoid valve
A11 ->N/C -
A12 ->N/C -
A13 ->B06 - Check Engine Light (MIL)
A14 ->N/C -
A15 ->B01 - A/C Clutch Relay
A16 ->N/C -
A17 ->N/C -
A18 ->N/C -
A19 ->N/C -
A20 ->B02 - Purge Control Solenoid Valve
A21 ->B15&B17 - Igniter Power Source (IGP1)
A22 ->N/C - Igniter Power Source (IGP2)
A23 ->A02 - Power Ground (PG1)
A24 ->A04 - Power Ground (PG2)
A25 ->A13 - Main Relay IGP1 (IG Power)
A26 ->A18 - Logic Ground (LG1)
A27 ->N/C -
B01 ->A15 - Power Source (IGP2)
B02 ->A16 - Logic Ground (LG2)
B03 ->N/C -
B04 ->N/C - Service Check Connector
B05 ->B08 - A/C Switch (ACS)
B06 ->N/C -
B07 ->N/C -
B08 ->N/C - P/S Pressure Switch
B09 ->B13 - Starter Switch Signal (STS)
B10 ->B16 - Speed Sensor
B11 ->C01 - CYL Sensor
B12 ->C02 - CYL Sensor
B13 ->C03 - TDC Sensor
B14 ->C04 - TDC Sensor
B15 ->B10 - Crank Angle Sensor
B16 ->B12 - Crank Sensor
D01 ->A17 - Back Up Fuse
D02 ->N/C - Brake Switch
D03 ->N/C - Knock Sensor
D04 ->N/C- Service Check & Ignition Timing Connector (SCS)
D05 ->N/C -
D06 ->N/C - VTEC Pressure Switch
D07 ->N/C - Data Link Connector
D08 ->N/C -
D09 ->B14 - Alternator
D10 ->B19 -
D11 ->C07 - Throttle Position Sensor (TPS)
D12 ->N/C -
D13 ->C06 - TW Sensor
D14 ->C16 - O2 Sensor
D15 ->C05 - Intake Air Temperature Sensor
D16 ->N/C -
D17 ->C11 - MAP Sensor
D18 ->N/C -
D19 ->C15 - Sensor Voltage (VCC1)
D20 ->C13 - Sensor Voltage (VCC2)
D21 ->C14 - Sensor Ground (SG1)
D22 ->C12 - Sensor Ground (SG2)
you have to short pin D04 to GND in order to check your CEL codes. btw, this harness has produced no codes in my car, other than the one i was getting before i even installed it.
| 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
|
Information Source: www.hondaswap.com
