| Pin Number | Wire Color (Typ) | Function | Description | | :--- | :--- | :--- | :--- | | | Red | VC (Voltage Control) | 5V reference voltage for TPS/MAP. | | A- | Light Green | THW (Coolant Temp) | Input from the coolant temperature sensor. | | A- | Yellow | THA (Intake Air Temp) | Input from the IAT sensor. | | A- | Blue | VTA (TPS Signal) | Throttle Position Sensor signal. | | A- | White | NE (RPM Signal) | Signal from the Distributor/Crank Angle Sensor. | | A- | Green/Red | SPD (Speed Sensor) | Input from the vehicle speed sensor. |
These are the main power feeds from the EFI relay. They should show 12V when the ignition is ON. 4s-fe ecu pinout
A deep dive into the 4S-FE ECU pinout!
(sharing architecture with the 3S-FE), many terminal labels are standardized across Toyota's 1990s ECUs. If you are looking at a standard 26P-16P-12P or 26P-16P connector set, the following signals are typically in these positions: Ignition Signals : Look for (Ignition Timing) and (Ignition Feedback). Sensor Inputs : Pressure Intake Manifold (MAP Sensor signal). : Water Temperature Signal (Green-Black wire). : Intake Air Temperature (Light Green-Black wire). : Oxygen Sensor (Lambda). Power & Ground : Constant +12V from EFI Main Relay. : Switched +12V ignition power. : Main computer grounds (usually White-Black or Brown). Fuel Injection are the primary injector pulse signals. Additional Reference Manuals | Pin Number | Wire Color (Typ) |
The "Breath"—the MAP sensor signal used to calculate engine load. The "Mid-Life Crisis": Capacitor Failure | | A- | Blue | VTA (TPS