How do you test the ecu on a 1999 pajero?

To test the ECU on a 1999 Pajero, start by using an OBD-II scanner to check for any stored error codes that can indicate issues with the ECU or other related components. Inspect the ECU connectors and wiring for any signs of damage or corrosion. You can also perform a voltage test on the ECU to ensure it is receiving the correct power supply. If necessary, consider conducting a continuity test on the ECU's ground and power circuits, or consult a professional mechanic for more advanced diagnostics.