Mazda CX-9 Grand Touring 2009 Manual page 1351

2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
other symptoms exist, go to the
next step.
Connect pressure gauge to the A/C low and
11
high side pressure lines.Turn the A/C on
and measure low side and high side
pressures.Are pressures within
specifications?(See REFRIGERANT
PRESSURE CHECK .)
Inspect for A/C cut-off operation.
(See ENGINE CONTROL SYSTEM
12
OPERATION INSPECTION [MZI-3.7].)
Does the A/C cut-off function properly?
Disconnect the vacuum hose between the
purge solenoid valve and the intake
manifold from purge solenoid valve side.
13
Plug opening end of vacuum hose.
Drive the vehicle.
Does the engine condition improve?
Visually inspect the CMP sensor and
projections of camshaft pulley.
14
Are the CMP sensor and projections of
camshaft pulley normal?
Inspect the variable valve timing control
system operation.
(See ENGINE CONTROL SYSTEM
15
OPERATION INSPECTION [MZI-3.7].)
Does the variable valve timing control
system function properly?
16 Is the engine compression correct?
Verify test results.
If normal, return to diagnostic index to service any additional symptoms.
17
(See SYMPTOM DIAGNOSTIC INDEX [MZI-3.7].)
If malfunction remains, inspect related Service Bulletins and/or On-line Repair
Information and perform repair or diagnosis.
2008 Mazda CX-9 Grand Touring
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
(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
Go to the next step.
Inspect A/C cut-off system components.
Inspect if purge solenoid valve is stuck
open mechanically.
Inspect the evaporative emission control
system.
(See ENGINE CONTROL SYSTEM
OPERATION INSPECTION [MZI-
3.7].)
Go to the next step.
Go to the next step.
Replace the malfunctioning part.
Go to the next step.
Repair or replace the malfunctioning part
according to variable valve timing control
system inspection results.
Inspect the following:
Valve timing
Internal transaxle components
Brake system for dragging
Inspect for cause.