Mazda 3 Workshop Manual page 221

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Inspect the PCV valve operation.
(See POSITIVE CRANKCASE
VENTILATION (PCV) VALVE
INSPECTION.)
• Is the PCV valve normal?
INSPECT VARIABLE TUMBLE SHUTTER
VALVE ACTUATOR OPERATION
• Perform the "Variable Tumble Control
Operation Inspection".
11
(See Variable Tumble Control Operation
Inspection.)
• Does the variable tumble control work
properly?
INSPECT FUEL LINE PRESSURE
• Turn the ignition switch off.
Note
• If the engine will not start, inspect
the fuel line pressure with the
12
ignition switch to the ON position.
• Inspect the fuel line pressure while the
engine running.
(See FUEL LINE PRESSURE
INSPECTION.)
• Is the fuel line pressure normal?
INSPECT FUEL LINE FROM FUEL PUMP
TO FUEL DELIVERY PIPE
13
• Visually inspect fuel line for any leakage.
• Is any fuel leakage found?
INSPECT VARIABLE VALVE TIMING
CONTROL SYSTEM OPERATION
• Inspect the variable valve timing control
system operation.
14
(See Variable Valve Timing Control System
Operation Inspection.)
• Does the variable valve timing control
system work properly?
15 INSPECT EGR VALVE STUCK OPEN
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Replace the PCV valve, then go to Step 16.
(See INTAKE-AIR SYSTEM HOSE ROUTING
DIAGRAM [Z6].)
Repair or replace malfunctioning part
according to inspection results, then go to
Step 16.
If the fuel pressure is too high, replace the fuel
pump unit, then go to Step 16.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
If the fuel line pressure is low, go to the next
step.
Replace suspected fuel line, then go to Step
16.
Inspect for foreign materials or stain inside
fuel filter (low pressure).
If for foreign materials or stain inside fuel filter
(low pressure), clean of fuel tank and filter.
Then go to Step 16.
Repair or replace malfunctioning part
according to inspection results, then go to
Step 16.
Clean or replace the EGR valve, then go to
the next step.
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