Mazda 3 Workshop Manual page 119

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
- Between MAF sensor and
throttle body
- Between throttle body and intake
manifold
• Is there any malfunction?
INSPECT FUEL LINE PRESSURE
• Inspect the fuel line pressure.
14
(See FUEL LINE PRESSURE
INSPECTION.)
• Is the fuel line pressure normal?
INSPECT FUEL LINE FROM FUEL
PUMP TO FUEL DELIVERY PIPE
• Visually inspect for fuel leakage in fuel
15
line for any leakage.
• Is any fuel leakage found?
INSPECT ENGINE COMPRESSION
• Inspect the engine compression.
16
(See COMPRESSION INSPECTION
• Is it normal?
INSPECT VARIABLE VALVE TIMING
CONTROL SYSTEM OPERATION
• Inspect the variable valve timing control
system operation.
17
(See Variable Valve Timing Control
System Operation
• Does the variable valve timing control
system?
Downloaded from
Yes Go to step 16.
No
Yes Replace the fuel line, then go to Step 22.
No
Yes Go to the next step.
[Z6].)
No
Yes Go to the next step.
No
Inspection.)
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If the fuel line pressure is too low, go to the next
step.
If the fuel line pressure is excess high, replace
the fuel pump unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
then go to Step 22.
Inspect the fuel filter for following:
• Foreign materials or stain inside fuel filter (low-
pressure side)
Perform following actions depending on the
result above.
• If there is any foreign materials or stain inside
fuel filter (low-pressure side), clean the fuel tank
and filter (low-pressure side).
• If there is no malfunction, replace the fuel
pump unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
Then, go to Step 22.
Perform the engine overhaul for repairs, then go
to Step 22.
Repair or replace malfunctioning part according
to variable valve timing control system
inspection results, then go to Step 22.
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