Mazda 3 - Page 321

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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321
POSSIBLE CAUSE
• Rear HO2S deterioration
• Rear HO2S heater malfunction
• Leakage exhaust system
• Open circuit or short to ground in wiring harness between rear HO2S
terminal A and PCM terminal 2AH
• Insufficient compression
• Engine malfunction
Diagnostic procedure
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA HAS BEEN
RECORDED
• Has FREEZE FRAME DATA been
recorded?
Yes
Go to the next step.
No
Record the FREEZE FRAME DATA on the
repair order, then go to the next step.
2
VERIFY RELATED REPAIR INFORMATION
AVAILABILITY
• Verify related service repair information
availability.
• Is any related repair information available?
Yes
Perform repair or diagnosis according to the
available repair information.
• If the vehicle is not repaired, go to the next
step.
No
Go to the next step.
3
VERIFY RELATED PENDING AND STORED
DTC
Yes
Go to the appropriate DTC troubleshooting
procedures.
(See DTC TABLE [LF].)