Mazda 6 - Foreword; Obd Freeze Frame Data; Obd Parameter Identification (Pid) Access; Obd Pending Trouble Codes

F2–38
ON-BOARD DIAGNOSTIC
FOREWORD
B6E407018881101
• When the customer reports a vehicle malfunction, check the malfunction indicator light (MIL) indication and
diagnostic trouble code (DTC), then diagnose the malfunction according to following flowchart.
— If the DTC exists, diagnose the applicable DTC inspection. (See F2–40 DTC TABLE.)
— If the DTC does not exist and the MIL does not illuminate or flash, diagnose the applicable symptom
troubleshooting.
* : Malfunction Indicator Light (MIL), Generator Warning Light, Security Light
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OBD PENDING TROUBLE CODES
B6E407018881102
• These appear when a problem is detected in a monitored system. The MIL is illuminated when a problem is
detected in two consecutive drive cycles. The code for a failed system is stored in the PCM memory in the first
drive cycle. This code is called the pending code. 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, deletes
the pending code, illuminates the MIL and stores the DTC.
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OBD FREEZE FRAME DATA
B6E407018881103
• This is the technical data which indicates the engine’s 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 Misfire or Fuel
System DTCs. Once freeze frame data for a 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 READ/CLEAR DIAGNOSTIC TEST RESULTS
B6E407018881104
• This retrieves all stored DTCs in the PCM and clears the DTC, 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
B6E407018881105
• 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
B6E407018881106
DTCs Retrieving Procedure
1. Perform the necessary vehicle preparation and visual inspection.
ON-BOARD DIAGNOSTIC
CUSTOMER ARRIVES
WARNING LIGHT*
ON/FLASHING
CHECK FOR
PRIORITIZED DTC
NO WARNING LIGHT*
WITH SYMPTOM
•CHECK DTC
•IGNITION ON TEST, IDLING TEST
DIAGNOSE BY DTC
(ON-BOARD DIAGNOSTIC)
•DTC TABLE
•DTC
TROUBLESHOOTING
FLOW
DIAGNOSE BY SYMPTOM
(SYMPTOM TROUBLESHOOTING)
1. DIAGNOSTIC INDEX
2. QUICK DIAGNOSIS CHART
3. SYMPTOM TROUBLESHOOTING
DTC
WITHOUT DTC
B6U0102W301