Ecu Pinout — 4s-fe
Controls the IAC (Idle Air Control) valve. How to Use the Pinout for Troubleshooting
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: Throttle Position Sensor (TPS). VCC provides a stable 5V reference to the sensor. VTA sends back a variable voltage corresponding to how far the throttle is open. IDL signals the ECU when your foot is completely off the gas pedal.
| Pin | Wire Color | Signal | Description | |------|------------|--------|--------------| | B1 | B-R | +B | Battery power (EFI main relay) | | B2 | B-Y | +B1 | Battery power (injectors, sensors) | | B3 | B-O | E1 | Power ground (ECU) | | B4 | B-W | E2 | Signal ground (sensors) | | B5 | R | #10 | Injector 1 | | B6 | L | #20 | Injector 2 | | B7 | Y | #30 | Injector 3 | | B8 | L-B | #40 | Injector 4 | | B9 | W | IGT | Ignition timing signal to igniter | | B10 | R-L | IGF | Ignition confirmation from igniter | | B11 | G | G- | Distributor G signal (-) | | B12 | G-R | G+ | Distributor G signal (+) | | B13 | W | NE+ | Distributor NE signal (rpm) | | B14 | B | NE- | Distributor NE signal (-) | | B15 | B-O | STA | Starter signal (from ignition switch) | | B16 | G-W | NSW | Neutral start switch (auto) / clutch switch (manual) | | B17 | R-B | VTA | Throttle position sensor (TPS) signal | | B18 | B-Y | VC | TPS 5V reference | | B19 | G-B | IDL | Idle switch (closed throttle) | | B20 | L-R | PIM | Manifold absolute pressure (MAP) | | B21 | - | - | Not used | | B22 | G-R | FC | Fuel pump relay control | 4s-fe ecu pinout
Ignition Confirmation signal. The igniter sends a pulse back to the ECU confirming that a spark successfully occurred. If the ECU loses the IGF signal, it shuts off the fuel injectors within seconds to protect the engine.
Check Engine Light (CEL) control wire. The ECU grounds this terminal to illuminate the warning lamp on your dash dashboard.
Locate the diagnostic box under the hood (labeled "DIAGNOSIS"). Controls the IAC (Idle Air Control) valve
| Pin | Type | Signal Name | Function | |:---:|:---:|:---:|:---| | 3 | Input | | Engine Coolant Temperature Signal | | 5 | Input | THA | Intake Air Temperature Signal | | 4 | Input | PIM | Intake Manifold Pressure Signal (for some markets) | | 7-8 | Input | VTA / VCC | Throttle Position Sensor Signal | | 9 | Input | NE | Crankshaft RPM Signal (from distributor) | | 21 | Input | NE (Alt.) | RPM Signal (alternate pin) | | 10 | Input | OX | Oxygen Sensor (Lambda) Signal | | 23 | Input | KNK | Knock Sensor Signal | | 16 | — | E2 | Sensor Ground (return for sensors) | | 24 | Ground | E1 | Computer Ground (main ground) |
Would you like to know more about a specific aspect of the 4S-FE ECU or have any questions about the pinout?
If your engine cranks but will not start, check the power pins: Turn the ignition key to the position. To do this effectively, I'll need to gather
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Always verify your specific plug shape. Toyota switched between "square" and "round" terminal styles in the early '90s. If your wire colors don't match standard 3S diagrams, focus on the pin position rather than the insulation color!
Toyota updated the 4S-FE engine control system several times during its production run. Because of this, you must match your specific ECU part number to your wiring harness. Generation 1 (Early 1990s)
If your 4S-FE engine runs rough or flashes a Check Engine Light, you can use the ECU pins to pull codes without an OBD2 scanner.
: Constant 12V Battery Power. This pin (often White/Blue) keeps the ECU's long-term memory and check-engine codes intact when the car is turned off.
