Mazda CX-9 Grand Touring 2007 Manual page 854

2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
26 Inspect the variable valve timing
control system operation.
(See ENGINE CONTROL SYSTEM
OPERATION INSPECTION [MZI-
3.5].)
Does variable valve timing control
function properly?
27 Is the engine compression correct?
28
Verify test results.
If normal, return to diagnostic index to service any additional symptoms.
(See ENGINE SYMPTOM TROUBLESHOOTING [MZI-3.5].)
If malfunction remains, inspect related Service Bulletins and/or On-line Repair
Information and perform repair or diagnosis.
NO.7 SLOW RETURN TO IDLE [MZI-3.5]
DESCRIPTION AND POSSIBLE CAUSES
7 SLOW RETURN TO IDLE
DESCRIPTION Engine takes more time than normal to return to idle speed.
POSSIBLE CAUSE
DIAGNOSTIC PROCEDURE
DIAGNOSTIC PROCEDURE
STEP INSPECTION
1 Connect the M-MDS to the DLC-2.
Turn the ignition switch to the ON position
(Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
2007 Mazda CX-9 Grand Touring
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-3.5] .)
CHT sensor malfunction
Thermostat is stuck open.
Throttle body malfunction
Air leakage from intake-air system
Yes Go to the next step.
No Repair or replace the malfunctioning
part.
Yes Inspect the valve timing.
No Inspect for causes.
RESULTS ACTION
Yes DTC is displayed:
Go to the appropriate DTC
inspection.
(see DTC TABLE [MZI-3.5] .)
No No DTC is displayed:
Go to the next step.