Mazda 3 Workshop Manual page 467

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Install fuel pressure gauge between fuel
pipe and the fuel distributor.
Connect the WDS or equivalent to the DLC-
2.
Turn ON and/or OFF using FP PID in
output state control of datalogger function.
Is fuel line pressure correct when FP PID is
turned ON/OFF five times?
(See FUEL LINE PRESSURE
INSPECTION.)
Visually inspect for fuel leakage at the fuel
injector O-ring and fuel line.
Service if necessary.
Turn OFF from ON using FP PID in output
21 state control of datalogger function.
Is fuel line pressure held after FP PID is
turned OFF?
(See FUEL LINE PRESSURE
INSPECTION.)
Disconnect the vacuum hose between the
purge solenoid valve and the intake
manifold from the purge solenoid valve
side.
22
Plug the opening end of vacuum hose.
Attempt to start engine.
Is starting condition improved?
Is air leakage felt or heard at intake-air
23 system components while the racing the
engine to higher speed?
Inspect engine condition while tapping the
EGR valve housing.
24
Does engine condition improve?
25
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Zero or low:
Inspect the fuel pump relay and the fuel
pump related circuit.
(See FUEL PUMP UNIT
Inspect the main 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 condition is normal, inspect the fuel
injector.
(See FUEL INJECTOR
• If condition is not normal, replace the
fuel pump unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
Inspect if the purge solenoid valve is
stuck open mechanically.
Inspect the evaporative emission control
system.
Go to the next step.
Repair or replace the malfunctioning
part.
Go to the next step.
Replace the EGR valve.
Go to the next step.
Go to the next step.
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INSPECTION.)
INSPECTION.)