Mazda 6 2002, Workshop Manual

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F–194
TROUBLESHOOTING
End Of Sie
24 Note
•
Following test is for stall concerns with A/
C on. If other symptoms exist, go to next
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 .)
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
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? Yes Inspect if purge solenoid valve sticks open.
Inspect evaporative emission control system.
No Go to next step.
26 Is air leakage felt or heard at intake-air system
components while racing engine to higher
speed? Yes Repair or replace.
No Go to next step.
27 Inspect engine condition while tapping EGR
valve housing.
Does engine condition improve? Yes Replace EGR valve.
No Go to next step.
28 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 work
properly?
Yes Go to next step.
No Repair or replace malfunctioning parts.
29 Is engine compression correct? Yes Inspect valve timing.
No Inspect for cause.
30 Verify test results.
•
If okay, return to diagnostic index to service any additional symptoms.
•
If malfunction remains, replace PCM.
STEP INSPECTION RESULTS ACTION