DIAGNOSTIC PROCEDURE
NO.10 LOW IDLE/STALLS DURING DECELERATION (MZI-3.7) DIAGNOSTIC PROCEDURE
POSSIBLE
CAUSE
z
Improper air/fuel mixture ratio control
z
Evaporative emission control system malfunction
z
Accelerator pedal position sensor or related circuit malfunction
z
Accelerator pedal position sensor misadjustment
z
TP sensor or related circuit malfunction
z
MAF sensor or related circuit malfunction
z
Brake switch or related circuit malfunction
z
TR switch or related circuit malfunction
z
Improper A/C magnetic clutch operation
STEP
INSPECTION
RESULTS
ACTION
1
Does the engine idle roughly?
Yes
Go to symptom troubleshooting "No.8
Engine runs rough/rolling idle".
(See
NO.8 ENGINE RUNS
ROUGH/ROLLING IDLE [MZI-3.7]
.)
No
Go to the next step.
2
Turn off the A/C switch and fan switch.
Does the A/C magnetic clutch engage?
Yes
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]
.)
No
Go to the next step.
3
Verify the following:
z
Proper routing of and no damage
to vacuum lines
z
No air leakage from intake-air
system
Are all items normal?
Yes
Go to the next step.
No
Service if necessary.
Repeat Step 3.
4
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-3.7]
.)
No
No DTC is displayed:
Go to the next step.
Perform the electronic throttle control
system operation inspection.
(See
ENGINE CONTROL SYSTEM
Yes
Go to the next step.
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:10:05 AM
Page 49
© 2005 Mitchell Repair Information Company, LLC.
