Mazda 3 Workshop Manual page 454

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Is the gap within specification?
Remove and shake the PCV valve.
8
Does the PCV valve rattle?
Install fuel pressure gauge between the
fuel pipe and the fuel distributor.
Connect WDS or equivalent to DLC-2.
Turn ON fuel pump using FP PID in
9 output state control of datalogger
function.
Is fuel line pressure correct?
(See FUEL LINE PRESSURE
INSPECTION.)
Is fuel line pressure held after FP PID is
turned OFF?
10
(See FUEL LINE PRESSURE
INSPECTION.)
Disconnect a vacuum hose from the
purge solenoid valve and plug opening
end of the vacuum hose.
11
Start the engine.
Is starting condition improved?
Inspect the MAF sensor for the
following:
• Contamination
12
• MAF sensor terminal B voltage (GND
circuit)
Is there any contamination?
Visually inspect the exhaust system
part.
13
Is there any deformed exhaust system
part?
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Go to the next step.
Replace the PCV valve.
Go to the next step.
Zero or low:
Inspect the fuel pump relay and the fuel
pump unit related circuits.
Inspect the fuel line for clogging.
• If normal, replace the 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.
• If condition is not normal, replace the
pressure regulator.
Inspect if the purge solenoid valve is stuck
open.
Go to the next step.
Replace the MAF sensor.
Go to the next step.
Replace the part.
Go to the next step.
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