4s-fe Ecu Pinout -

If you are currently working on a wiring project, I can help you narrow down your specific setup. Could you tell me: What is your 4S-FE from?

Toyota ECUs label their plugs alphabetically from left to right (usually Plug A, Plug B, and Plug C). Plug A (Power Supply & Ground Circuits)

| Pin | Function (Code) | Pin | Function (Code) | | :--- | :--- | :--- | :--- | | A1 | Injector 1 (#10) | A14 | TPS VTA | | A2 | Injector 2 (#20) | A15 | – | | A3 | Injector 3 (#30) | A16 | +B (Main Power) | | A4 | Injector 4 (#40) | A17 | E01 (Power Ground) | | A5 | ISC Solenoid Open (RSO) | A18 | E02 (Power Ground) | | A6 | ISC Solenoid Close (RSC) | A19 | A/C Compressor Relay (ACT) | | A7 | IGT (Igniter) | A20 | Radiator Fan Relay (FAN) | | A8 | IGF (Igniter) | A21 | Check Engine Light (W) | | A9 | – | A22 | Speed Signal Output (SPD) | | A10 | ACIS Control (Optional) | A23 | Fuel Pump Control (FPC) | | A11 | Main Relay Control (MREL) | A24 | E2 (Sensor Ground) | | A12 | EGR Vacuum Modulator (VSV) | A25 | OX1 (O2 Sensor) | | A13 | EGR Temperature Sensor (EGR) | A26 | OX2 (O2 Sensor) |

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4S-FE ECU pinout essential for troubleshooting or wiring engine swaps involving this 1.8-liter Toyota engine

differ. Using a 3S-FE ECU on a 4S-FE engine may lead to rich running conditions because the 3S-FE is tuned for a larger displacement (2.0L vs 1.8L). Physically, 4S-FE engines often have different sensor locations, such as the engine number being near the oil filter rather than the side of the block. 4E-FE ECU Pinout and Wiring Details | PDF - Scribd

Found in later late-90s models.

: If the ECU does not receive the IGF signal, it will stop firing injectors as a safety measure.

You can find high-resolution JDM wiring maps on Scribd's Toyota JDM Guide.

However, because the 4S-FE and 3S-FE share the same S-series engine architecture, their ECUs often use the same or 12-pin / 16-pin / 26-pin connector configurations. Common Toyota "S-Series" ECU Pinout (Standard Layout) If you are currently working on a wiring

Keep the E01/E02 injector grounds physically separated from the E2 sensor ground until they reach their designated pin locations to prevent sensor signal drift.

: Electrical Load Signals. These signal the ECU when you turn on high-draw electrical components (like headlights, rear defroster, or the A/C). The ECU then slightly bumps the idle to prevent the engine from stalling.