Pinout _top_: 4s-fe Ecu

If your 4S-FE engine exhibits a crank-no-start condition, rough idling, or poor fuel economy, use a digital multimeter (DMM) at the ECU pins to trace the root cause. Fixing a "No Spark" Issue

Never bridge sensor grounds with power grounds (E01/E02), as this can cause electrical noise and incorrect sensor readings. 4s-fe ecu pinout

Switch your multimeter to resistance (Ohms). Check continuity between E2 and the negative battery terminal. It should read less than 0.5 Ohms. If your 4S-FE engine exhibits a crank-no-start condition,