Mazda 6 2002 Workshop Manual page 306

STEP INSPECTION
13 Note
• Following test is for engine stalling with A/
C on concern. If other symptoms eist, go
to net 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.)
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?
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?
16 Visually inspect CMP sensor and projections of
camshaft pulley.
Are CMP sensor and projections of camshaft
pulley okay?
17 Inspect EGR system.
(See F–233 EGR Control System
Is EGR system okay?
18 Note
• The following test should be performed for
vehicles with variable valve timing control
system. Go to net 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?
19 Is engine compression correct?
20 Verify test results.
• If okay, return to diagnostic inde to service any additional symptoms.
• If malfunction remains, replace PCM.
End Of Sie
TROUBLESHOOTING
RESULTS
Yes Go to net 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:
Yes Go to net step.
No Inspect A/C cut-off system components.
Yes Inspect if purge solenoid valve is sticks open
mechanically.
Inspect evaporative emission control system.
No Go to net step.
Yes Go to net step.
No Replace malfunctioning parts.
Yes Go to net step.
Inspection.)
No Replace malfunctioning parts.
Yes Go to net step.
No Repair or replace malfunctioning parts.
Yes Inspect following:
No Inspect for cause.
ACTION
• Refrigerant charging amount
• Condenser fan operation
• Valve timing
• Internal transale components (ATX)
• Clutch (MTX)
• Brake system for dragging
F
F–209