The K20A uses a 3-lobe VTEC system (i-VTEC) + VTC (Variable Timing Control).
This guide focuses on the commonly found in 02-04 K20A engines. k20a ecu pinout
| Pin | Wire Color (Typ) | Function | Description | | :--- | :--- | :--- | :--- | | | BLK/WHT | PO2S | Primary O2 Sensor Signal | | 2 | WHT/RED | PHO2S | Primary Heated O2 Sensor | | 6 | BLU/WHT | VTC | Variable Timing Control Solenoid | | 7 | BLK/GRN | LSDB | Linear Solenoid Duty B (Transmission) | | 8 | YEL/BLK | IGP3 | Ignition Power | | 10 | RED/BLU | VBS | Valve Body Supply (Transmission) | | 11 | RED | K-LINE | K-Line Serial Data (OBDII port) | | 12 | BLK/GRN | BRK | Brake Switch | | 15 | GRN/YEL | VTS | VTEC Solenoid Valve | | 16 | WHT/BLU | SG4 | Sensor Ground | | 17 | BLU/BLK | VCCE | Sensor Voltage (+5V) | | 18 | GRN/YEL | SA2 | Sensor Ground | | 22 | RED/BLU | KS | Knock Sensor | | 23 | BLU/BLK | EGRP | EGR Valve Lift Signal | The K20A uses a 3-lobe VTEC system (i-VTEC)
PG1 and PG2 (Power Ground). These are the main grounds for the ECU circuitry. These are the main grounds for the ECU circuitry
While the physical ECU cases are identical, the internal logic and some pin assignments differ between the JDM (Type R) and USDM PRB (Type S) units. engine harness difference? - K20A.org
VTC Oil Control Solenoid. This manages the variable timing control on the intake cam.