Mazda 3 Workshop Manual page 581

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Is the lever in correct position?
Visually inspect deformed exhaust
system part.
10
Is there any deformed exhaust system
part?
Install fuel pressure gauge between
the fuel pipe and 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 fuel
injector O-ring and fuel line.
Service if necessary.
12
Is fuel line pressure held after the
ignition switch is turned off?
(See FUEL LINE PRESSURE
INSPECTION.)
Note
• Following test is for engine
stall with the A/C on. If other
symptom exists, go to the
next step.
Connect a pressure gauge to the A/C
13
low and high pressure side lines.
Turn the A/C on and measure low
side and high side pressure.
Are pressure within specifications?
(See REFRIGERANT PRESSURE
CHECK.)
14
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Replace the suspected part.
Go to the next step.
Go to the next step.
Zero or low:
Inspect the fuel pump and the fuel pump relay
related circuit.
Inspect the fuel line for clogging.
• If there is no malfunction, 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 fuel injector.
• If the fuel injector is normal, replace the fuel
pump unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
Go to the next step.
If the A/C is always on, go to symptom
troubleshooting "No.24 A/C is always on or
A/C compressor runs continuously".
(See NO.24 A/C IS ALWAYS ON OR A/C
COMPRESSOR RUNS CONTINUOUSLY
[LF].)
For other symptoms, inspect following:
• Refrigerant charging amount
• Condenser fan operation
Go to the next step.
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