Reads atmospheric data from the Manifold Absolute Pressure (MAP) or Mass Air Flow (MAF) sensor, Intake Air Temperature (IAT) sensor, and Engine Coolant Temperature (ECT) sensor to trim the fuel map. Feedback Systems: Uses Oxygen ( cap O sub 2
How many (and pins per plug) are on your specific ECU?
Fuel Pump Control. This pin triggers the circuit opening relay to turn the fuel pump on once the engine starts cranking. Typical 26-Pin / 16-Pin / 22-Pin Pinout Mapping Reference 3s-fe ecu pinout pdf
A proper pinout diagram will show:
Route a fused wire from the positive battery terminal to the BATT pin. Reads atmospheric data from the Manifold Absolute Pressure
Many enthusiast sites archive these.
If your car won't start, check these first on the ECU plug. This pin triggers the circuit opening relay to
Engine and sensor grounds. E1 is usually the main chassis ground, while E2 is the dedicated clean ground for sensors. Ignition & Timing Signals
Probe the PIM pin. Voltage should sweep smoothly from ~1.5V at idle to ~3.5V+ at Wide Open Throttle (WOT). A "stuck" voltage here will cause the ECU to default to a rich/lean limp mode.
What did the 3S-FE engine come out of?
Ultimate Toyota 3S-FE ECU Pinout Guide: Wiring Diagram & PDF Resources
