NO.7 SLOW RETURN TO IDLE [MZI-3.5]
DESCRIPTION AND POSSIBLE CAUSES
DIAGNOSTIC PROCEDURE
DIAGNOSTIC PROCEDURE
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?
Yes
Go to the next step.
No
Repair or replace the malfunctioning
part.
27
Is the engine compression correct?
Yes
Inspect the valve timing.
No
Inspect for causes.
28
z
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.
z
If vehicle is repaired, troubleshooting completed.
z
If vehicle is not repaired or additional diagnostic information is not
available, replace the PCM.
(see
PCM REMOVAL/INSTALLATION [MZI-3.5]
.)
7
SLOW RETURN TO IDLE
DESCRIPTION
Engine takes more time than normal to return to idle speed.
POSSIBLE CAUSE
z
CHT sensor malfunction
z
Thermostat is stuck open.
z
Throttle body malfunction
z
Air leakage from intake-air system
STEP INSPECTION
RESULTS ACTION
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?
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.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE Symptom Troubleshooting (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:27:37 AM
Page 37
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