On-Board Diagnostic (OBD) test mode

WARNING: This page is about a different car, the 2020 Mazda CX-30. However, it is still accessible from the selected car via links, so may be relevant.

The OBD system detects malfunction in the exhaust gas purification system and evaporative gas leakage of the vehicle itself, and it records that malfunction content.
Diagnosis related to the OBD system can be facilitated using the OBD test mode.

Mode 1: On-Board system readiness test

In Mode 1, the completion status of the PID/data monitor related to the exhaust gas purification system and related system monitors can be verified.
The system monitor verifies whether the operation condition such as for misfire, fuel, CCM, catalyst, evaporative gas, HO2S, and HO2S heater is operating normally.

Mode 2: Freeze frame data

Mode 2 reads out the freeze frame data.
The M-MDS displays the freeze frame data automatically when the CMDTCs are displayed.

Mode 3: Exhaust gas purification system related CMDTC

Mode 3 reads out the CMDTCs related to the exhaust gas purification system.
When a quick check is performed, the M-MDS automatically reads out the CMDTCs related to the exhaust gas purification system.

Mode 4: Exhaust gas purification system-related malfunction information deletion/reset

Mode 4 deletes/resets information (such as CMDTC, pending code, and freeze frame data) related to the exhaust gas purification system.
When the DTCs are cleared, the M-MDS automatically deletes/resets the information related to the exhaust gas purification system.

Mode 5: HO2S monitor test

Mode 5 reads out the results of HO2S monitor test.
The M-MDS does not support because it substitutes for Mode 6. Mode 6: Diagnostic monitoring test
Mode 6 reads out the results (number of misfires of each cylinder) of each system monitor test.

Mode 7: Pending code

Mode 7 reads out the pending codes.
When a self-test is performed, the M-MDS automatically reads out the pending codes.

Mode 8: Force drive

Mode 8 performs force drive.
The M-MDS is used only for forcibly driving the valve for the outlet opening to atmosphere of the charcoal canister to check for fuel evaporative gas leakage.

Mode 9: Vehicle information read out

Mode 9 reads out information such as the vehicle identification number and calibration ID number.