Mazda CX-9 Grand Touring. Manual — part 335
14
Connect the M-MDS to the DLC-2.
Start the engine and idle it.
Access LONG FT1 PID, LONG FT2 PID.
Measure LONG FT1 PID, LONG FT2 PID
at idle.
Is PID value normal?
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.
15
Disconnect the vacuum hose between the
purge solenoid valve and the intake
manifold from purge solenoid valve side.
Plug opening end of vacuum hose.
Start the engine.
Does the engine condition improve?
Yes
Check if purge solenoid valve is stuck
open mechanically.
Inspect EVAP control system.
No
Go to the next step.
16
Remove and shake the PCV valve.
Does the PCV valve rattle?
Yes
Go to the next step.
No
Replace the PCV valve.
17
Visually inspect the exhaust system part.
Is there any deformed exhaust system part?
Yes
Replace the suspected part.
No
Go to the next step.
18
Visually inspect the CMP sensor and teeth
of camshaft.
Are the CMP sensor and teeth of camshaft
normal?
Yes
Go to the next step.
No
Replace the malfunctioning part.
19
Inspect variable valve timing control
system operation.
(See ENGINE CONTROL SYSTEM
OPERATION INSPECTION [MZI-
3.7].)
Does variable valve timing control system
function properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part.
20
Is engine compression correct?
Yes
Inspect the valve timing.
No
Inspect for causes.
21
Verify test results.
If normal, return to diagnostic index to service any additional symptoms.
(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
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:10:05 AM
Page 46
© 2005 Mitchell Repair Information Company, LLC.
NO.9 FAST IDLE/RUNS ON [MZI-3.7]
NO.9 FAST IDLE/RUNS ON (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
DIAGNOSTIC PROCEDURE
NO.9 FAST IDLE/RUNS ON (MZI-3.7) DIAGNOSTIC PROCEDURE
If vehicle is not repaired or additional diagnostic information is not available,
replace the PCM.
(See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
9
FAST IDLE/RUNS ON
DESCRIPTION
The engine speed continues at fast idle after warm-up.
The engine runs after the ignition switch is turned off.
POSSIBLE CAUSE
CHT sensor malfunction
Air leakage from intake-air system
Throttle body malfunction
Accelerator pedal position sensor misadjustment
Cruise control system operation improperly
Improper load signal input
Improper operation of electronic throttle control system
STEP
INSPECTION
RESULTS
ACTION
1
Connect the M-MDS to the DLC-2.
Access ECT PID.
Start and warm up engine to normal
operating temperature.
Is ECT PID between 82-112°C
{180-234°F}?
Yes
Go to the next step.
No
ECT PID is higher than 112°C {234°F}:
Go to symptom troubleshooting "No.17 Cooling
system concerns - Overheating".
ECT PID is less than 82°C {180°F}:
Go to symptom troubleshooting "No.18 Cooling
system concerns - Runs cold".
2
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.
Yes
Go to the next step.
If the AC_REQ PID is not normal:
Inspect A/C switch, refrigerant pressure
switch, and fan switch, and related wiring
harness for vibration or intermittent
open/short circuit.
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 47
© 2005 Mitchell Repair Information Company, LLC.
NO.10 LOW IDLE/STALLS DURING DECELERATION [MZI-3.7]
NO.10 LOW IDLE/STALLS DURING DECELERATION (MZI-3.7) DETECTION CONDITIONS AND
POSSIBLE CAUSES
3
Access and monitor PSP and TR
PIDs.
Are PIDs values normal?
(See PCM INSPECTION [MZI-
3.7] .)
No
If the TR PID is not normal:
Inspect TR switch and related wiring
harness for vibration or intermittent
open/short circuit.
If the PSP PID is not normal:
Inspect power steering switch and related
wiring harness for vibration or intermittent
open/short circuit.
4
Is there air leakage felt or heard at
intake-air system components while
racing engine to higher speed?
Yes
Repair or replace parts if necessary.
No
Inspect the following:
Electronic throttle control system
operation
Accelerator pedal position sensor
5
Verify test results.
If normal, return to diagnostic index to service any additional symptoms.
(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.
If vehicle is not repaired or additional diagnostic information is not available,
replace the PCM.
(See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
10
LOW IDLE/STALLS DURING DECELERATION
DESCRIPTION
Engine stops unexpectedly at the beginning of deceleration or recovery from
deceleration.
Vacuum leakage
Improper operation of electronic throttle control system
Air leakage from intake-air system
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 48
© 2005 Mitchell Repair Information Company, LLC.
DIAGNOSTIC PROCEDURE
NO.10 LOW IDLE/STALLS DURING DECELERATION (MZI-3.7) DIAGNOSTIC PROCEDURE
POSSIBLE
CAUSE
Improper air/fuel mixture ratio control
Evaporative emission control system malfunction
Accelerator pedal position sensor or related circuit malfunction
Accelerator pedal position sensor misadjustment
TP sensor or related circuit malfunction
MAF sensor or related circuit malfunction
Brake switch or related circuit malfunction
TR switch or related circuit malfunction
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:
Proper routing of and no damage
to vacuum lines
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.
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