Mazda CX-9 Grand Touring 2009 Manual page 1323

2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
INSPECTION [MZI-3.7] .)
NOTE:
The following test is for stall
concerns with the A/C on. If other
symptoms exist, go to the next
step.
23
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 REFRIGERANT
PRESSURE CHECK .)
Disconnect the vacuum hose between the
purge solenoid valve and the intake
manifold from purge solenoid side.
24
Plug opening end of vacuum hose.
Start the engine.
Is the engine stall now eliminated?
Is air leakage felt or heard at intake-air
25 system components while racing the
engine to higher speed?
Inspect variable valve timing control
system operation.
(See ENGINE CONTROL SYSTEM
26 OPERATION INSPECTION [MZI-
3.7].)
Does variable valve timing control
function properly?
27 Is the engine compression correct?
Verify test results.
If normal, return to diagnostic index to service any additional symptoms.
(See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7].)
If malfunction remains, inspect related Service Bulletins and/or On-line Repair
28
Information and perform repair or diagnosis.
If vehicle is repaired, troubleshooting completed.
If vehicle is not repaired or additional diagnostic information is not available,
replace the PCM.
(See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
2008 Mazda CX-9 Grand Touring
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
3.7] .)
Go to the next step.
If 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 [MZI-3.7].)
For other symptoms, inspect the following:
Refrigerant charging amount
Condenser fan operation
Inspect if purge solenoid valve is stuck
open.
Inspect evaporative emission control
system.
Go to the next step.
Repair or replace the malfunctioning part.
Go to the next step.
Go to the next step.
Repair or replace the malfunctioning parts
according to variable valve timing control
system operation inspection results.
Inspect the valve timing.
Inspect for cause.