Pinout | 4s-fe Ecu

These are power grounds specifically for the high-current injector drivers. Essential Sensor Inputs

Identifies if the car is in P/N (A/T) or neutral (M/T). STA (Starter Signal): Tells the ECU the engine is cranking. 3. Actuator/Output Pins 4s-fe ecu pinout

The signal from the distributor or crank sensor that tells the ECU how fast the engine is spinning. Diagnostic Pins: The TE1 and E1 Bridge These are power grounds specifically for the high-current

| Pin | Type | Signal Name | Function | |:---:|:---:|:---:|:---| | 2 | Input | | Switched Battery Power (12V from EFI Main Relay) | | 9 | Input | +B | Switched Battery Power (12V from EFI Main Relay) | | 24 | Ground | E1 | ECU Main Ground (shared with main connector) | | 10 | Output | W | Check Engine Warning Light | | 2 | Output | TE1 / TE2 | Diagnostic Check Connector Signals | | 13 | Input | SPD | Vehicle Speed Sensor Signal | | 12 | Input | AC1 | A/C Switch Signal | | 16 | Output | VF / VF1 | Diagnostic Output Signal | | 11 | Input | STA | Engine Cranking Signal (Starter Switch) | PIM: Pressure intake manifold (MAP sensor signal)

Injector pulse signals (usually split by cylinders 1&3 and 2&4). PIM: Pressure intake manifold (MAP sensor signal). THA: Temperature Intake Air (IAT sensor). THW: Temperature Water (ECT sensor).

Diagnostics "Test" terminals. Shorting TE1 to E1 triggers "Check Engine" light flash codes. Speed signal from the instrument cluster (VSS). Starter signal used to enrich fuel during cranking. Throttle Position Sensor (TPS) idle contact signal. Key Differences: 4S-FE vs. 3S-FE While the wiring is nearly identical, the ECU fuel maps