Mazda 6 2002, Workshop Manual

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TROUBLESHOOTING
F–209
F
End Of Sie
13 Note
•
Following test is for engine stalling with A/
C on concern. If other symptoms exist, go
to next step.
Connect pressure gauge to A/C low and high
side pressure lines.
Turn A/C on and measure low side and high side
pressures.
Are pressures within specifications?
(See
U–12 REFRIGERANT PRESSURE
CHECK .)
Yes Go to next step.
No If A/C is always on, go to symptom troubleshooting
"No.24 A/C is always on or A/C compressor runs
continuously".
For other symptoms, inspect following:
•
Refrigerant charging amount
•
Condenser fan operation
14 Inspect for A/C cut-off operation.
(See
F–234 A/C Cut-off Control System
Inspection .)
Does A/C cut-off work properly?
Yes Go to next step.
No Inspect A/C cut-off system components.
15 Disconnect vacuum hose between purge
solenoid valve and intake manifold from purge
solenoid valve side.
Plug opening end of vacuum hose.
Drive vehicle.
Does engine condition improve? Yes Inspect if purge solenoid valve is sticks open
mechanically.
Inspect evaporative emission control system.
No Go to next step.
16 Visually inspect CMP sensor and projections of
camshaft pulley.
Are CMP sensor and projections of camshaft
pulley okay? Yes Go to next step.
No Replace malfunctioning parts.
17 Inspect EGR system.
(See
F–233 EGR Control System Inspection .)
Is EGR system okay?
Yes Go to next step.
No Replace malfunctioning parts.
18 Note
•
The following test should be performed for
vehicles with variable valve timing control
system. Go to next step for vehicles
without variable valve timing control
system.
Inspect variable valve timing control system
operation.
(See
F–239 Variable Valve Timing Control
System Operation Inspection .)
Does variable valve timing control system work
properly?
Yes Go to next step.
No Repair or replace malfunctioning parts.
19 Is engine compression correct? Yes Inspect following:
•
Valve timing
•
Internal transaxle components (ATX)
•
Clutch (MTX)
•
Brake system for dragging
No Inspect for cause.
20 Verify test results.
•
If okay, return to diagnostic index to service any additional symptoms.
•
If malfunction remains, replace PCM.
STEP INSPECTION RESULTS ACTION