Signal from the Throttle Position Sensor (TPS) indicating throttle blade angle.
Often used for diagnostic connections (TE1, TE2) and load signals like vehicle lighting or heated windows. Key Terminal Assignments
What did the 3S-FE engine come out of?
| Pin Label | Function | Typical Wire Color | |-----------|----------|--------------------| | | Constant 12V (ECU memory) | B (Black) or B-W | | IG SW | Switched 12V (Ignition on) | B-Y (Black-Yellow) | | E1, E01, E02 | ECU Grounds (to engine block) | B (Black) | | STA | Starter signal | B-W (Black-White) | | IGf | Ignition feedback (from igniter) | G (Green) or B-O | | VTA | Throttle position sensor signal | G-B (Green-Black) | | VCC | 5V sensor supply | Y-B (Yellow-Black) | | E2 | Sensor ground | B (Black) | | OX1 / OX2 | Oxygen sensor signal | B (Black) or G (Green) | | THW | Coolant temp sensor | B-Y (Black-Yellow) | | THA | Intake air temp | L-Y (Blue-Yellow) | | VS | Air flow meter signal | R-B (Red-Black) | | FC | Circuit opening relay (fuel pump) | B-O (Black-Orange) | | ACT | A/C switch signal | B (Black) | | NSW | Neutral start switch (auto trans) | B-W (Black-White) | | SPD | Vehicle speed sensor | V-W (Violet-White) | | W | Check engine light | Y (Yellow) or Y-R | | TE1 / TE2 | Diagnostic test connectors | G (Green) |
Before searching for a PDF, you must identify your specific ECU. The 3S-FE was produced from the mid-80s through the early 2000s, meaning there are several versions: 3s-fe ecu pinout pdf
Look at the sticker on your ECU casing. It will follow a format like 89661-xxxxx . Search specifically for this part number when looking up diagrams.
Often features high-density plastic connectors with locking levers. Signal from the Throttle Position Sensor (TPS) indicating
These pins receive varying voltage signals from the engine bay to calculate fuel and timing.
Connect BATT to a constant 12V source. Connect +B and +B1 to a 12V source triggered by your ignition switch through an EFI relay. | Pin Label | Function | Typical Wire
Whether you are performing an engine swap, building a standalone management system, diagnosing a crank/no-start condition, or repairing wiring damage, having the correct ECU pinout diagram is non-negotiable.
Toyota used the 3S-FE engine across many models and generations (1986–2000). Pinouts vary significantly between OBD-I (pre-1995) and OBD-II (1996+) systems, and between manual/automatic transmissions. Always match the pinout to your exact chassis code and ECU part number.
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