Mazda 3 Workshop Manual page 201

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Is the PID normal?
INSPECT INTAKE-AIR SYSTEM FOR
EXCESSIVE AIR SUCTION
• Visually inspect hoses in intake-air
10
system for looseness, cracks or damages
.
• Is there any malfunction?
INSPECT FUEL LINE PRESSURE
• Perform the "FUEL LINE PRESSURE
INSPECTION".
11
(See FUEL LINE PRESSURE
INSPECTION.)
• Is there any malfunction?
INSPECT FUEL SYSTEM FOR FUEL
LEAKAGE
• Visually inspect fuel leakage in the fuel
12
system.
• Is there fuel leakage?
INSPECT IGNITION COIL HARNESS
• Inspect the ignition coil related harness
13 condition (intermittent open or short
circuit) for all cylinders.
• Are harness conditions normal?
INSPECT IGNITION SYSTEM
OPERATION
• Perform the spark test.
14
(See Spark Test.)
• Is strong blue spark visible at each
cylinder?
INSPECT ENGINE COMPRESSION
• Inspect the engine compression.
15
(See COMPRESSION INSPECTION
[Z6].)
• Is there any malfunction?
INSPECT FUEL INJECTOR
• Inspect the fuel injector.
16
(See FUEL INJECTOR
Downloaded from
Yes
No Go to the next step.
Yes Go to the next step.
No Go to Step 13.
Yes
No
Yes Go to the next step.
No
Yes Go to the next step.
No
Yes Go to the next step.
No Overhaul engine, then go to Step 17.
Yes
INSPECTION.)
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Repair or replace the malfunctioning part, then
go to Step 17.
Repair or replace the malfunctioning part, then
go to Step 17.
Replace the fuel pump unit, then go to Step 17.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
Repair suspected wiring harnesses, then go to
Step 17.
Repair or replace malfunctioning part according
to spark test result.
Then go to Step 17.
Replace suspected fuel injector, then go to the
next step.
(See FUEL INJECTOR
REMOVAL/INSTALLATION
- automotive repair manuals website
[Z6].)