Mazda CX-9 Grand Touring 2009 Manual page 1337

2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Connect the M-MDS to the DLC-2.
Start the engine and idle it.
Access LONG FT1 PID, LONG FT2 PID.
14
Measure LONG FT1 PID, LONG FT2 PID
at idle.
Is PID value normal?
Disconnect the vacuum hose between the
purge solenoid valve and the intake
manifold from purge solenoid valve side.
15
Plug opening end of vacuum hose.
Start the engine.
Does the engine condition improve?
Remove and shake the PCV valve.
16
Does the PCV valve rattle?
Visually inspect the exhaust system part.
17
Is there any deformed exhaust system part?
Visually inspect the CMP sensor and teeth
of camshaft.
18
Are the CMP sensor and teeth of camshaft
normal?
Inspect variable valve timing control
system operation.
(See ENGINE CONTROL SYSTEM
19 OPERATION INSPECTION [MZI-
3.7].)
Does variable valve timing control system
function properly?
20 Is engine compression correct?
Verify test results.
If normal, return to diagnostic index to service any additional symptoms.
21
(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.
If vehicle is repaired, troubleshooting completed.
2008 Mazda CX-9 Grand Touring
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
Yes
No
LONG FT1 PID, LONG FT2 PID is out of
specification.
Less than specification (too rich):
Inspect EVAP control system.
Greater than specification (too lean):
Inspect for air leakage at intake-air
system components.
If system is normal, go to the
next step.
Check if purge solenoid valve is stuck
open mechanically.
Inspect EVAP control system.
Go to the next step.
Go to the next step.
Replace the PCV valve.
Replace the suspected part.
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.
Inspect the valve timing.
Inspect for causes.