Mazda 3 Workshop Manual page 203

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Front HO2S malfunction
• Excessive fuel line pressure
• Fuel pump unit malfunction
• Purge solenoid 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 RELATED 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 to the 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
STATUS OF REAR HO2S
• Connect the WDS or equivalent to the
DLC-2.
5
• Start the engine and warm it up
completely.
• Access the O2S12 PID.
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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 [Z6].)
No Go to the next step.
Yes Go to the next step.
Go to the FREEZE FRAME DATA DTC
inspection.
No
(See DTC TABLE [Z6].)
Yes Go to the next step.
Visually inspect for exhaust gas leakage
between the TWC and rear HO2S.
• If there is no leakage, replace the rear HO2S.
No
(See REAR HEATED OXYGEN SENSOR
(HO2S) REMOVAL/INSTALLATION
Then go to Step 11.
- automotive repair manuals website
[Z6].)