Mazda 3 Workshop Manual page 474

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Does fuel line pressure hold after the
ignition switch is turned off?
(See FUEL LINE PRESSURE
INSPECTION.)
Connect the WDS or equivalent to the
DLC-2.
Start the engine and idle it.
Access O2S11 PID.
Is O2S11 PID normal?
15
• More than 0.45 V when accelerator
pedal is suddenly depressed: rich
condition
• Less than 0.45 V during fuel cut:
lean condition
Disconnect the vacuum hose between
the purge solenoid valve and the intake
manifold from the purge solenoid valve
side.
16
Plug the opening end of vacuum hose.
Start the engine.
Does engine condition improve?
Remove and shake the PCV valve.
17
Does the PCV valve rattle?
Visually inspect the exhaust system
part.
18
Is there any deformed exhaust system
part?
Visually inspect the CMP sensor and
teeth of camshaft pulley.
19
Are the CMP sensor and teeth of the
camshaft pulley normal?
Inspect engine condition while tapping
the EGR valve housing.
20
Does engine condition improve?
21
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• If condition is normal, inspect the fuel
injector.
(See FUEL INJECTOR INSPECTION.)
• If condition is not normal, replace fuel pump
unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
Go to the next step.
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 [Z6].)
Inspect if the purge solenoid valve is stuck
open mechanically.
Inspect EVAP control system.
(See Purge Control System
Go to the next step.
Go to the next step.
Replace the PCV valve.
Replace the suspected part.
Go to the next step.
Go to the next step.
Replace the malfunctioning part.
Replace the EGR valve.
(See EGR VALVE
REMOVAL/INSTALLATION
Go to the next step.
Go to the next step.
- automotive repair manuals website
Inspection.)
[Z6].)