Mazda 3 Workshop Manual page 415

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Visually inspect for loosen, cracks or
damages hoses on intake-air system.
• Is there any malfunction?
INSPECT PURGE SOLENOID VALVE
STUCK OPEN
• Turn ignition switch to off.
• Disconnect both hoses from purge
10
solenoid valve.
• Blow air through purge solenoid valve.
• Does air blow through?
INSPECT FUEL LINE PRESSURE
• Turn ignition switch to off.
• Inspect fuel line pressure.
11
(See FUEL LINE PRESSURE
INSPECTION.)
• Is fuel line pressure normal?
INSPECT FUEL LINE FROM FUEL PUMP
TO FUEL DELIVERY PIPE
12
• Visually inspect fuel line for any leakage.
• Is any fuel leakage found?
INSPECT IGNITION SYSTEM
• Carry out spark test.
13
(See Spark Test.)
• Is strong blue spark visible at each
cylinder?
INSPECT ENGINE COMPRESSION
• Inspect engine compression.
14
(See COMPRESSION INSPECTION
• Is it normal?
INSPECT FUEL INJECTOR OPERATION
• Remove fuel injector.
15
• Inspect fuel injector (resistance, injection
amount).
(See FUEL INJECTOR
Downloaded from
No Go to the next step.
Yes
No Go to the next step.
Yes Go to Step 13.
No
Yes
No
Yes Go to the next step.
No
Yes Go to the next step.
[LF].)
No
Yes Go to the next step.
No
INSPECTION.)
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Replace purge solenoid valve.
Then go to Step 16.
If fuel pressure is too high, replace fuel pump
unit, then go to Step 16.
If 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 spark test results, then go to Step 16.
Implement engine overhaul for repairs, then go
to Step 16.
Replace suspected fuel injector, then go to the
next step.
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