How do you check if ecm is faulty on a Nissan 280z?

To check if the ECM (Engine Control Module) is faulty on a Nissan 280Z, you can start by inspecting the wiring and connectors for any signs of damage or corrosion. Next, use an OBD-I scanner or a multimeter to check for error codes and verify that the ECM is receiving proper voltage and ground signals. Additionally, you can monitor the engine's performance for irregularities, such as poor fuel economy or erratic idling, which may indicate an ECM issue. If necessary, consult a professional technician for further diagnostics.