Always check for 0V at ground pins ; any reading above 0.1V may indicate a bad ground wire.
Before testing sensors, you must ensure the ECU is receiving power. Constant 12V power from the EFI relay.
Depending on whether your 2NZ-FE uses a MAP or MAF sensor, these pins handle the incoming air volume data. THW: Engine coolant temperature signal. OX1A: Oxygen sensor signal for air-fuel ratio monitoring. 4. Communication and Diagnostics
Signal for the coolant temperature sensor. OX1 (Oxygen Sensor): Primary O2 sensor signal. IG1 / IG2 / IG3: Signals for the ignition coils. NE (Crankshaft Position): Critical engine speed signal. 📄 Recommended PDF Resources
: Enthusiast sites (e.g., Toyota Owners Club or PakWheels) often have dedicated threads with high-resolution images of ECU pinouts for engine swaps.
