Mazda 6. Manual - part 135
F–62
ON-BOARD DIAGNOSTIC
OBD PENDING TROUBLE CODES
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• These appear when a problem is detected in a monitored system.
2 Drive Cycle Type
• The code for a failed system is stored in the PCM memory in the first drive cycle. If the problem is not found in
the second drive cycle, the PCM judges that the system returned to normal or the problem was mistakenly
detected, and deletes the pending code. If the problem is found in the second drive cycle too, the PCM judges
that the system has failed, and stores the pending codes, and the DTCs.
• After pending codes are stored, if the PCM judges that the system is normal in any future drive cycle, the PCM
deletes the pending codes.
1 Drive Cycle Type
• If any problems are detected in the first drive cycle, pending codes will be stored in the PCM memory, as well
as DTCs.
• After pending codes are stored, if the PCM judges that the system is normal in any future drive cycle, the PCM
deletes the pending codes.
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OBD FREEZE FRAME DATA
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• This is the technical data which indicates the engine condition at the time of the first malfunction. This data will
remain in the memory even if another emission-related DTC is stored, with the exception of the Misfire or Fuel
System DTCs. Once freeze frame data for the Misfire or Fuel System DTC is stored, it will overwrite any
previous data and the freeze frame will not be overwritten again.
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OBD ON-BOARD SYSTEM READINESS TEST
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• This shows OBD system operating status. If any monitor function is incomplete, WDS or equivalent will identify
which monitor function has not been completed. Misfires, Fuel System and Comprehensive Components
(CCM) are continuous monitoring-type functions. The catalyst, EGR system and oxygen sensor will be
monitored under drive cycles. The OBD diagnostic system is initialized by performing the DTC cancellation
procedure or disconnecting the negative battery cable.
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OBD DIAGNOSTIC MONITORING TEST RESULTS
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• These results from the intermittent monitor system’s technical data, which are used to determine whether the
system is normal or not. They also display the system thresholds and diagnostic results. The intermittent
monitor system monitors the oxygen sensorand the catalyst.
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OBD READ/CLEAR DIAGNOSTIC TEST RESULTS
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• This retrieves all stored DTCs in the PCM and clears the DTCs, Freeze Frame Data, On-Board Readiness Test
Results, Diagnostic Monitoring Test Results and Pending Trouble Codes.
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OBD PARAMETER IDENTIFICATION (PID) ACCESS
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• The PID mode allows access to certain data values, analog and digital inputs and outputs, calculated values
and system status information. Since PID values for output devices are PCM internal data values, inspect each
device to identify which output devices are malfunctioning.
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ON-BOARD DIAGNOSTIC TEST
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DTCs Reading Procedure
1. Perform the necessary vehicle preparation and visual inspection.
2. Connect WDS or equivalent to the vehicle DLC-2
16-pin connector located as shown in the figure.
3. Retrieve DTCs by WDS or equivalent.
DLC-2
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