Count the flashes of the "Check Engine" light to read the 2-digit fault codes.
The signal from the distributor or crank sensor that tells the ECU how fast the engine is spinning. Diagnostic Pins: The TE1 and E1 Bridge 4s-fe ecu pinout
Informs the ECU the engine is cranking so it can provide a richer fuel mixture for starting. Critical Sensors Count the flashes of the "Check Engine" light
Primary computer grounds (usually bolted to the intake manifold or cylinder head). E1: The main internal ground for the ECU logic circuit. 4s-fe ecu pinout