4s-fe Ecu Pinout [VERIFIED]

For more precise diagrams, you can find scanned service manuals on platforms like Scribd or community forums like Toymods , which often host detailed wiring PDFs for specific chassis like the Toyota Corona or Carina.

Random misfires, erratic idle, transmission shifting hard (AT), no start. Fix: Open the ECU. Look for electrolytic capacitors (cylindrical components) near the harness plug. If they are leaking brown/black goo onto the circuit board, you need immediate repair. Action: Desolder and replace all capacitors (typically 100µF, 220µF, 470µF values). Clean the board with isopropyl alcohol. 4s-fe ecu pinout

| 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 | For more precise diagrams, you can find scanned

The ECU used in 4S-FE engines from 1990 to 1996 is the Toyota ECU type " 89661-..." or " 89761-...". Clean the board with isopropyl alcohol