Mazda 3 Workshop Manual page 587

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
Inspect the variable tumble control
operation.
(See Variable Tumble Control
11
Operation Inspection.)
Does the variable tumble control
function properly?
Inspect the variable intake-air
operation.
(See Variable Intake-air Control
12
Operation Inspection.)
Does the variable intake-air function
properly?
Note
• The following test is for
engine stall with the A/C on
concern. If other symptoms
exist, go to the next step.
Connect pressure gauge to 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.)
Inspect A/C cut-off operation.
(See A/C Cut-off Control System
14
Inspection.)
Does A/C cut-off work properly?
Disconnect vacuum hose between the
purge valve and the intake manifold
from the purge valve side.
15
Plug opening end of vacuum hose.
Drive the vehicle.
Does the engine condition improve?
Visually inspect the CMP sensor and
projections of camshaft pulley.
16
Are CMP sensor and projections of
camshaft pulley normal?
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No
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(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
[LF].)
For other symptoms, inspect following:
• Refrigerant charging amount
• Condenser fan operation
Go to the next step.
Inspect the A/C cut-off system components.
Inspect if the purge valve is stuck open
mechanically.
Inspect the EVAP control system.
(See Purge Control System
Go to the next step.
Go to the next step.
Replace the malfunctioning part.
- automotive repair manuals website
Inspection.)