Mazda 3 Workshop Manual page 213

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• Does the EGR control system work
properly?
INSPECT VARIABLE TUMBLE
SHUTTER VALVE ACTUATOR
OPERATION
• Perform the "Variable Tumble Control
Operation Inspection".
12
(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 ignition switch to the ON
13
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
14
• Visually inspect fuel line for leakage.
• Is any fuel leakage found?
INSPECT VARIABLE VALVE TIMING
CONTROL SYSTEM OPERATION
• Inspect the variable valve timing control
system operation.
15
(See Variable Valve Timing Control
System Operation
• Does the variable valve timing control
system work properly?
VERIFY TROUBLESHOOTING OF DTC
16
P2178 COMPLETED
Downloaded from
Yes Go to the next step.
No
Yes Go to the next step.
No
Yes Replace suspected fuel line, then go to Step 16.
No
Yes Go to the next step.
No
Inspection.)
Yes
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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.
Inspect inside fuel filter (low pressure) for
foreign materials or stain.
If there is foreign materials or stain inside fuel
filter (low pressure), clean the fuel tank and
filter.
Then go to Step 16.
Repair or replace malfunctioning part according
to inspection results, then go to the next step.
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION
- automotive repair manuals website
[Z6].)