Mazda 3 Workshop Manual page 582

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Connect the WDS or equivalent to the
DLC-2.
Warm up the engine and idle it.
Access O2S11 PID.
Is O2S11 PID normal?
• More than 0.45 V when the
accelerator pedal is suddenly
depressed: rich condition.
• Less than 0.45 V during fuel cut:
lean condition.
Inspect the evaporative purge hose
between the fuel tank and the purge
valve.
15
Dose fuel flow into evaporative purge
hose?
Disconnect the vacuum hose between
the purge valve and the intake
manifold from the purge valve side.
Plug the opening end of vacuum
16
hose.
Drive the vehicle.
Does the engine condition improve?
Visually inspect the CMP sensor and
projections of the camshaft pulley.
17
Are the CMP sensor and projections
of camshaft pulley normal?
Inspect the variable tumble control
operation.
18 (See Variable Tumble Control
Operation Inspection.)
Is the variable tumble control normal?
Inspect the EGR system.
(See EGR Control System
19
Inspection.)
Is EGR system normal?
20 Is engine compression correct?
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Inspect and repair or replace the front HO2S,
wiring harness, connector or terminal, then go
to the next step.
(See FRONT HEATED OXYGEN SENSOR
(HO2S) INSPECTION [LF].)
Inspect the check valve (two-way).
(See FUEL TANK INSPECTION.)
Go to the next step.
Go to the next step.
Inspect if the purge valve is stuck open
mechanically.
Inspect the evaporative emission control
system.
Go to the next step.
Go to the next step.
Replace the malfunctioning part.
Go to the next step.
Replace or replace the malfunctioning part.
Go to the next step.
Replace the malfunctioning part.
Inspect the following:
• Valve timing
• Clutch
• EGR valve (mechanical stuck)
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