On-Board Diagnostic; Foreword; Obd Pending Trouble Codes; Obd Freeze Frame Data - Mazda 6 Workshop Manual

FOREWORD

• 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
— If the DTC does not exist and the MIL does not illuminate or flash, diagnose the applicable symptom
troubleshooting.
WARNING LIGHT*
ON/FLASHING
CHECK FOR
PRIORITIZED DTC
DIAGNOSE BY DTC

(ON-BOARD DIAGNOSTIC)

•DTC TABLE
•DTC
TROUBLESHOOTING
FLOW
* : Malfunction Indicator Light (MIL), Generator Warning Light, Security Light
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OBD PENDING TROUBLE CODES

• 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

• 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

• 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

• 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

DTCs Retrieving Procedure
1. Perform the necessary vehicle preparation and visual inspection.
F2–38
ON-BOARD DIAGNOSTIC
ON-BOARD DIAGNOSTIC
CUSTOMER ARRIVES
DTC
F2–40 DTC TABLE.)
NO WARNING LIGHT*
WITH SYMPTOM
•CHECK DTC
•IGNITION ON TEST, IDLING TEST
WITHOUT DTC
DIAGNOSE BY SYMPTOM
(SYMPTOM TROUBLESHOOTING)
1. DIAGNOSTIC INDEX
2. QUICK DIAGNOSIS CHART
3. SYMPTOM TROUBLESHOOTING
B6E407018881101
B6U0102W301
B6E407018881102
B6E407018881103
B6E407018881104
B6E407018881105
B6E407018881106