Mazda 3 Workshop Manual page 484

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Remove and shake the PCV valve.
8
Does the PCV valve rattle?
Verify that the throttle lever is resting on
the throttle valve stop screw and/or the
9
throttle valve orifice plug.
Is lever in correct position?
Visually inspect the exhaust system
part.
10
Is there any deformed exhaust system
part?
Install fuel pressure gauge between the
fuel pipe and the fuel distributor.
Connect the WDS or equivalent to the
DLC-2.
Turn the fuel pump on using FP PID in
11
output state control of datalogger
function.
Is fuel line pressure correct?
(See FUEL LINE PRESSURE
INSPECTION.)
Visually inspect for fuel leakage at the
fuel injector O-ring and fuel line.
Service if necessary.
12
Is fuel line pressure held after FP PID is
turned Off?
(See FUEL LINE PRESSURE
INSPECTION.)
13
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Install spark plugs on original cylinders.
Go to the next step.
Go to the next step.
Replace the PCV valve.
Go to the next step.
Adjust if necessary.
Replace the suspected part.
Go to the next step.
Go to the next step.
Zero or low:
Inspect the fuel pump relay and the fuel
pump related circuit.
Inspect the fuel line for clogging.
• if there is no malfunction, replace fuel
pump unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
High:
Replace the fuel pump unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
Go to the next step.
Inspect the pressure regulator diaphragm
condition.
• If the condition is normal, inspect the fuel
injector.
(See FUEL INJECTOR INSPECTION.)
• If the condition is not normal, replace the
fuel pump unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
Go to the next step.
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