Mazda 3 Workshop Manual page 403

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Connect the WDS or equivalent to the
DLC-2.
• Start the engine and warm it up
completely.
• Access O2S12 PID.
• Read O2S12 PID under following
accelerator pedal condition (in NEUTRAL).
- More than 0.45 V when
accelerator pedal is suddenly
depressed (rich condition).
- Less than 0.45 V just after
release of accelerator pedal (lean
condition)
• Is the PID normal?
VERIFY CURRENT INPUT SIGNAL
STATUS
• Connect the WDS or equivalent to the
DLC-2.
• Verify the following PIDs.
(See PCM INSPECTION
6
- ECT
- MAF
- TP
- VSS
• Are the PIDs normal?
VERIFY CURRENT INPUT SIGNAL
STATUS UNDER FREEZE FRAME DATA
CONDITION
• Connect the WDS or equivalent to the
DLC-2.
• Verify the following PIDs under FREEZE
FRAME DATA condition.
7
(See PCM INSPECTION
- ECT
- MAF
- TP
- VSS
• Are the PIDs normal?
8
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Yes Go to the next step.
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No
Yes Go to the next step.
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No
Yes Go to the next step.
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• If there is no leakage, replace rear HO2S.
(See HEATED OXYGEN SENSOR (HO2S)
REMOVAL/INSTALLATION
Then go to Step 11.
Inspect the malfunctioning part according to
the inspection results.
Then go to Step 11.
Inspect the malfunctioning part according to
the inspection results.
Then go to Step 11.
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