Mazda 3 Workshop Manual page 402

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• The DTC is stored in the PCM memory.
• Leakage exhaust gas
• Rear HO2S malfunction
• IAT sensor malfunction
• ECT sensor malfunction
• Front HO2S malfunction
POSSIBLE
• Excessive fuel line pressure
CAUSE
• Fuel pump unit malfunction
• Purge valve malfunction
• Insufficient engine compression
• PCM malfunction
Diagnostic procedure
STEP
VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED
1
• Has FREEZE FRAME DATA been
recorded?
VERIFY REPAIR INFORMATION
AVAILABILITY
• Verify related service repair information
2
availability.
• Is any related repair information available?
VERIFY RELATED PENDING CODE OR
STORED DTC
• Turn the ignition switch off, then ON
position (Engine off).
3
• Verify the related PENDING CODE or
stored DTCs.
• Is the DTC P2178 or P2188 also present?
IDENTIFY TRIGGER DTC FOR FREEZE
FRAME DATA
4
• Is DTC P2097 on FREEZE FRAME
DATA?
VERIFY CURRENT INPUT SIGNAL
5
STATUS OF REAR HO2S
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INSPECTION
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ACTION
Yes Go to the next step.
Record the FREEZE FRAME DATA on the
No
repair order, then go to the next step.
Perform repair or diagnosis according to the
available repair information.
Yes
If the vehicle is not repaired, go to the next
step.
No Go to the next step.
Go to the applicable DTC troubleshooting.
Yes
(See DTC TABLE [LF].)
No Go to the next step.
Yes Go to the next step.
Go to FREEZE FRAME DATA DTC inspection.
No
(See DTC TABLE [LF].)
Yes Go to the next step.
Visually inspect for the exhaust gas leakage
No
between TWC and rear HO2S.
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