Mazda 3 Workshop Manual page 490

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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
10
output state control of datalogger
function.
Is fuel line pressure correct?
(See FUEL LINE PRESSURE
INSPECTION.)
Inspect variable tumble control
operation.
(See Variable Tumble Control
11
Operation Inspection.)
Does the variable tumble control
function properly?
Inspect variable intake-air control
operation.
(See Variable Intake-air Control
12
Operation Inspection.)
Does the variable intake-air control
function properly?
Note
• Following test is for the
engine stalling with the A/C on
concern. If other symptoms
exist, go to the next step.
Connect pressure gauge to the A/C low
13
and high side pressure lines.
Turn the A/C on and measure low side
and high side pressures.
Are pressures within specifications?
(See REFRIGERANT PRESSURE
CHECK.)
14 Inspect A/C cut-off operation.
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Go to the next step.
Zero or low:
Inspect the fuel pump relay and the fuel
pump relay related circuit.
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.
Repair or replace the malfunctioning part.
Go to the next step.
Repair or replace the malfunctioning part.
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
[Z6].)
For other symptoms, inspect the following:
• Refrigerant charging amount
• Condenser fan operation
Go to the next step.
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