ON-BOARD DIAGNOSTIC OUTLINE [F2]
id010294100100
Outline
• The on-board diagnostic system has the following functions:
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― Failure detection function: Detects input/output signal malfunctions
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― PID /DATA MONITOR AND RECORD function: Reads specified input/output signals
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― SIMULATION function: Drives output system parts
• The on-board diagnostic system can be used by connecting the Mazda Modular Diagnostic System (M-MDS) to the DLC-2. It is possible to read only the DTCs using a voltmeter.
Failure detection function
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• The failure detection function detects malfunctions in the input/output system (when the ignition switch is on or while driving).
• When a failure is detected, the DTCs are output through the failure indication function and the serial communication function to the DLC-2, or the FEN and KLN terminals in the DLC. At the same time, the detection results are also sent to the fail-safe function and the memory function.
Fail-safe function
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• The fail-safe function ensures the minimum vehicle drivability by switching the signal judged as a failure in the failure detection function to the preset value and limiting the PCM control.
Memory function
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• The memory function memorizes the signal systems judged to be abnormal in the failure detection function. The memory cannot be erased even if the ignition switch is turned off (LOCK position) or after recovering from the failure.