Mazda CX-9 Grand Touring. Manual - part 336

OPERATION INSPECTION [MZI-
3.7].)
Does the electronic throttle control
system function properly?

Repair or replace the malfunctioning part

according to electronic throttle control

system operation inspection results.

Disconnect the vacuum hose between the
purge solenoid valve and the intake
manifold from purge solenoid valve side.
Plug opening end of vacuum hose.
Drive the vehicle.
Does the engine condition improve?

Yes

Inspect the evaporative emission control
system.

Go to the next step.

Connect the M-MDS to the DLC-2.
Access APP1, APP2, APP3, TP1, TP2,
MAF and VSS PIDs.
Monitor each PID while driving vehicle.
(See PCM INSPECTION [MZI-3.7] .)
Are PIDs normal?

Yes

Go to the next step.

APP1, APP2, APP3 PIDs:

Inspect the accelerator pedal position sensor.

TP1, TP2 PID:

Inspect TP sensor.

MAF PID:

Inspect MAF sensor.

VSS PID:

Inspect VSS.

Access and monitor BOO, TR PIDs.
Are PIDs values normal?
(See PCM INSPECTION [MZI-3.7] .)

Yes

Go to the next step.

If the BOO PID is not normal:



Inspect brake switch, and related

wiring harness for vibration or
intermittent open/short circuit.

If the TR PID is not normal:



Inspect TR switch and related wiring

harness for vibration or intermittent

open/short circuit.



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] .)

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 50

NO.11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES,
BUCK/JERK, HESITATION/STUMBLE, SURGES [MZI-3.7]

NO.11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK,
HESITATION/STUMBLE, SURGES (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE
CAUSES

ENGINE STALLS/QUITS-ACCELERATION/CRUISE
ENGINE RUNS ROUGH-ACCELERATION/CRUISE
MISSES-ACCELERATION/CRUISE
BUCK/JERK-ACCELERATION/CRUISE/DECELERATION
HESITATION/STUMBLE-ACCELERATION
SURGES-ACCELERATION/CRUISE

DESCRIPTION



Engine stops unexpectedly at the beginning of acceleration or during
acceleration.



Engine stops unexpectedly while cruising.



Engine speed fluctuates during acceleration or cruising.



Engine misses during acceleration or cruising.



Vehicle bucks/jerks during acceleration, cruising, or deceleration.



Momentary pause at beginning of acceleration or during acceleration



Momentary minor irregularity in engine output



Improper A/C system operation



Erratic signal or no signal from CMP sensor



Air leakage from intake-air system parts



Purge solenoid valve malfunction



Improper operation of electronic throttle control system



Erratic signal from CKP sensor



Low engine compression



Vacuum leakage



Poor fuel quality



Main relay intermittent malfunction



Throttle body malfunction



Engine overheating



Spark plug malfunction



Improper air/fuel mixture ratio control operation



Erratic signal to ignition coil



Air cleaner restriction



PCV valve malfunction



Fuel flow into evaporative purge hose



Improper valve timing due to jumping out timing chain

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 51

DIAGNOSTIC PROCEDURE

NO.11 ENGINE STALLS/QUITS, ENGINE RUNS ROUGH, MISSES, BUCK/JERK,
HESITATION/STUMBLE, SURGES (MZI-3.7) DIAGNOSTIC PROCEDURE

POSSIBLE

CAUSE



Restriction in exhaust system



Intermittent open or short circuit in fuel body pump circuit



Inadequate fuel pressure



Fuel pump mechanical malfunction



Check valve (two-way) malfunction integrated with fuel tank



Fuel leakage from fuel injector



Fuel injector clogging



Fuel line restriction or clogging



Pressure regulator malfunction (built-in fuel pump unit)



Erratic signal form APP sensor



Erratic signal form TP sensor



Intermittent open or short circuit of MAF sensor, TP sensor, APP sensor and
VSS



ATX malfunction



Loose attaching bolts or worn engine mounts

WARNING:

The following troubleshooting flow chart contains the fuel system diagnosis
and repair procedures. Read the following warnings before servicing the fuel
system:



Fuel vapor is hazardous. It can easily ignite, causing serious injury and
damage. Always keep sparks and flames away from fuel.



Fuel line spills and leakage are dangerous. Fuel can ignite and cause
serious injuries or death and damage. Fuel can also irritate skin and
eyes. To prevent this, always complete "BEFORE SERVICE
PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this
manual.

(See BEFORE SERVICE PRECAUTION [MZI-3.7] .)

(See AFTER SERVICE PRECAUTION [MZI-3.7] .)

CAUTION:



Disconnecting/connecting quick release connector without cleaning it
may cause damage to fuel pipe and quick release connector. Always
clean quick release connector joint area before
disconnecting/connecting, and make sure that it is free of foreign
material.

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 52

STEP

INSPECTION

RESULTS

ACTION

Verify the following:



Vacuum connection



Air cleaner element



No air leakage from intake-air
system



No restriction of intake-air system



Proper sealing of intake manifold
and components attached to intake
manifold



Ignition wiring



Fuel quality (such as proper octane,
contamination, winter/summer
blend)



Electrical connections



Smooth operation of throttle valve

Are all items normal?

Yes

Go to the next step.

Service if necessary.

Repeat Step 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-3.7] .)

No DTC is displayed:

Go to the next step.

Is engine overheating?

Yes

Go to symptom troubleshooting "No.17
Cooling system concerns - Overheating".

Go to the next step.

Connect the M-MDS to the DLC-2.
Access APP1, APP2, APP3, RPM, VPWR,
MAF, TP1, TP2 and VSS PIDs.
Drive the vehicle with monitoring PIDs.
Are PIDs within specifications?
(See PCM INSPECTION [MZI-3.7] .)

Yes

Go to the next step.

APP1, APP2, APP3 PIDs:

Inspect if output signal from APP sensor

changes smoothly.

RPM PID:

Inspect the CKP sensor and related wiring

harness for vibration or intermittent

open/short circuit.

VPWR PID:

Inspect for open circuit intermittently.

MAF PID:

Inspect for open circuit of the MAF sensor

and related wiring harness intermittently.

TP1, TP2 PID:

Inspect if output signal from TP sensor

changes smoothly.

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 53

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