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Use a paperclip or jumper wire to bridge the and E1 terminals. Turn the ignition key to "ON".
If your engine cranks but will not start, check the power pins: Turn the ignition key to the position.
What or symptom are you trying to fix? Share public link
When working with the 4S-FE wiring loom, three specific problems occur frequently: 4s-fe ecu pinout
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.
terminals in the diagnostic "Check Connector." By jumping these pins with a paperclip, you can force the ECU to "blink" its diagnostic codes through the dashboard light, revealing hidden engine secrets without needing a scanner.
is frequently used as a reference because many of the sensor signal pins (THW, PIM, IGT) follow the same logic and connector shapes. Troubleshooting Tips Check Power & Ground : If the engine won't start, verify 12V at , and check for continuity between and the engine block. Verify Ignition : A missing Use a paperclip or jumper wire to bridge
At closed throttle, VTA should read ~0.5V. At wide open throttle, ~4.5V. The ECU also uses an idle switch (often separate wire inside same sensor – IDL pin). If IDL is stuck open, the ECU won’t enter idle control mode, leading to hanging revs.
Signal back from the igniter confirming the coil fired (required to keep the fuel pump running).
Look closely at the silk-screened text next to the solder joints. What or symptom are you trying to fix
Switched 12V power source from the EFI main relay.
If the engine cranks but doesn’t start, the ECU needs NE and G signals.
The Toyota 4S-FE is a reliable 1.8-liter inline-four engine from the S-series family. It powered popular 1990s models like the Corona, Carina, Camry, and Chaser. When performing an engine swap, diagnosing electrical issues, or installing an aftermarket piggyback controller, an accurate Electronic Control Unit (ECU) pinout is essential.
If you are diagnosing a "crank, no start" condition on your 4S-FE, grab a digital multimeter and perform these checks at the ECU pins: