fed by the key-on crank power to tell the ECU the vehicle is attempting to start.
Throttle Position Sensor (TPS) signal and idle switch. toyota 4afe ecu pinout
Found in late-generation Corollas (like the E110). Some regional variants removed the traditional distributor in favor of a distributorless twin-coil wasted spark ignition system. These systems feature distinct ECU architectures and look closer to OBD2 compliance. 2. Common 4A-FE ECU Connector Layouts fed by the key-on crank power to tell
Typically uses a 3-plug layout split into 26-pin, 16-pin, and 22-pin connections. These systems primarily rely on an analog Manifold Absolute Pressure (MAP) sensor or Vane Air Flow meter system. Common 4A-FE ECU Connector Layouts Typically uses a
| Pin No. | Wire Color (Typical) | Signal Description | Connection / Notes | | :--- | :--- | :--- | :--- | | | Black/Red | BATT (Battery Power) | Constant +12V (Fuse Box) | | 2 | Black/Orange | M-REL (Main Relay) | Triggers Main EFI Relay Coil | | 3 | Black/White | +B (Main Power) | Switched +12V from EFI Main Relay | | 4 | – | Not Used | | | 5 | – | Not Used | | | 6 | Blue/Yellow | FC (Fuel Pump Control) | Opens Fuel Pump Circuit (Failsafe) | | 7 | Blue/Black | RSC (ISC Valve Close) | Idle Speed Control Valve | | 8 | Blue/Red | RSO (ISC Valve Open) | Idle Speed Control Valve | | 9 | Blue | #10 (Injector 1) | Fuel Injector #1 Driver | | 10 | Yellow | #20 (Injector 2) | Fuel Injector #2 Driver | | 11 | Blue/White | RCK (Tachometer) | Tachometer Output Signal | | 12 | – | Not Used | | | 13 | Yellow/Red | ELS (Electrical Load) | Headlights/Defogger Signal | | 14 | Blue/Black | W (Warning Light) | Check Engine Light (CEL) Output | | 15 | – | Not Used | | | 16 | – | Not Used | |