Mazda 6 2002 Workshop Manual page 291

STEP
24 Note
• Following test is for stall concerns with A/
C on. If other symptoms eist, go to net
step.
Connect pressure gauges to A/C low and high
pressure side lines.
Turn A/C on and measure low side and high side
pressures.
Are pressures within specifications?
(See U–12 REFRIGERANT PRESSURE
CHECK.)
25 Disconnect vacuum hose between purge
solenoid valve and intake manifold from purge
solenoid side.
Plug opening end of vacuum hose.
Start engine.
Is engine stall now eliminated?
26 Is air leakage felt or heard at intake-air system
components while racing engine to higher
speed?
27 Inspect engine condition while tapping EGR
valve housing.
Does engine condition improve?
28 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
Does variable valve timing control work
properly?
29 Is engine compression correct?
30 Verify test results.
• If okay, return to diagnostic inde to service any additional symptoms.
• If malfunction remains, replace PCM.
End Of Sie
F–194
TROUBLESHOOTING
INSPECTION
Inspection.)
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:
• Refrigerant charging amount
• Condenser fan operation
Yes Inspect if purge solenoid valve sticks open.
Inspect evaporative emission control system.
No Go to net step.
Yes Repair or replace.
No Go to net step.
Yes Replace EGR valve.
No Go to net step.
Yes Go to net step.
No Repair or replace malfunctioning parts.
Yes Inspect valve timing.
No Inspect for cause.
ACTION