Symptom Troubleshooting [L3 With Tc]; Foreword[L3 With Tc]; Obd-Ii Pending Trouble Code[L3 With Tc]; Obd-Ii Freeze Frame Data[L3 With Tc] - Mazda CX-7 2007 Workshop Manual

FOREWORD[L3 WITH TC]

• When the customer reports a vehicle malfunction, check the malfunction indicator lamp (MIL) indication and
diagnostic trouble code (DTC), then diagnose the malfunction according to the following flowchart.
— If a DTC exists, diagnose the applicable DTC inspection. (See 01-02-13 DTC TABLE[L3 WITH TC].)
— If a DTC does not exist and the MIL does not illuminate or flash, diagnose the applicable symptom
troubleshooting. (See 01-03-8 QUICK DIAGNOSTIC CHART[L3 WITH TC].)
WARNING LIGHT*
ON/FLASHING
CHECK FOR
PRIORITIZED DTC
DIAGNOSE BY DTC
(ON-BOARD DIAGNOSTIC)
•DTC TABLE
•DTC
TROUBLESHOOTING
FLOW
*: Malfunction Indicator Lamp (MIL), Generator Warning Light, Security Light
End Of Sie

OBD-II PENDING TROUBLE CODE[L3 WITH TC]

• These appear when a problem is detected in a monitored system. 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 PCM determines that the
system has returned to normal or the problem was mistakenly detected, it deletes the pending code. If the
problem is found in the second drive cycle, too the PCM determines that the system is malfunctioning, and the
DTC is stored.
End Of Sie

OBD-II FREEZE FRAME DATA[L3 WITH TC]

• This is 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.
End Of Sie
OBD-II ON-BOARD SYSTEM READINESS TEST[L3 WITH TC]
• This shows the OBD-II systems operating status. If any monitor function is incomplete, the M-MDS 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, evaporation system and oxygen
sensor will be monitored under drive cycles. The OBD-II diagnostic system is initialized by performing the DTC
cancellation procedure or disconnecting the negative battery cable.
End Of Sie

OBD-II READ/CLEAR DIAGNOSTIC TEST RESULTS[L3 WITH TC]

• 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.
End Of Sie

OBD-II PARAMETER IDENTIFICATION (PID) ACCESS[L3 WITH TC]

• 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.
End Of Sie
01-02–6
ON-BOARD DIAGNOSTIC [L3 WITH TC]
CUSTOMER ARRIVES
DTC
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
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