Mazda 3 Workshop Manual page 200

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
- 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 the
FREEZE FRAME DATA condition.
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(See PCM INSPECTION
- ECT
- MAF
- TP
- VSS
• Are the PIDs normal?
VERIFY CURRENT INPUT SIGNAL
STATUS OF FRONT HO2S
• Connect the WDS or equivalent to the
DLC-2.
• Start the engine and warm it up
completely.
• Access O2S11 PID.
• Read O2S11 PID under following
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accelerator pedal condition (in PARK or
NEUTRAL).
- More than 0.45 V when
suddenly depressing accelerator
pedal (rich condition)
- Less than 0.45 V just after
releasing accelerator pedal (lean
condition)
• Is the PID normal?
VERIFY CURRENT INPUT SIGNAL
STATUS OF MAF SENSOR
• Connect the WDS or equivalent to the
DLC-2.
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• Start the engine.
• Access the MAF PID.
• Verify that the MAF PID changes quickly
according to engine speed.
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Inspect the malfunctioning part according to the
inspection results.
Then go to Step 17.
Visually inspect for exhaust gas leakage
between exhaust manifold and front HO2S.
• If there is no leakage, replace front HO2S.
(See FRONT HEATED OXYGEN SENSOR
(HO2S) REMOVAL/INSTALLATION
Then go to Step 17.
Replace MAF/IAT sensor, then go to Step 17.
(See MASS AIR FLOW (MAF)/INTAKE AIR
TEMPERATURE (IAT) SENSOR
REMOVAL/INSTALLATION
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