With Generic Scan Tool

1. Prepare the OBD II scan tool.
2. Connect the OBD II scan tool to DLC3.
3. Turn the ignition switch ON and push the OBD II scan tool ON.
4. Use the OBD II scan tool to check the DTCs and freezed frame data, note them down (For operating instructions, see the OBD II scan tool's instruction book).
If there is no DTC in the normal mode, check the 1st trip DTC using Continuous Test Results function (Mode 7 for SAE J1979) on the OBD II scan tool.
5. See Trouble Code Descriptions to confirm the details of the DTCs.

NOTE:
- When simulating symptoms with an OBD II scan tool (excluding TOYOTA hand-held tester) to check the DTCs, use the normal mode. For code on the DTC chart subject to "2 trip detection logic", perform the following either action.
- Turn the ignition switch OFF after the symptom is simulated the 1st time. Then repeat the simulation process again. When the problem has been simulated twice, the MIL lights up and the DTCs are recorded in the ECM.
- Check theist trip DTC using Mode 7 (Continuous Test Results) for SAE J1979.