Mazda CX-9 Grand Touring. Manual — part 336
5
OPERATION INSPECTION [MZI-
3.7].)
Does the electronic throttle control
system function properly?
No
Repair or replace the malfunctioning part
according to electronic throttle control
system operation inspection results.
6
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.
No
Go to the next step.
7
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.
No
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.
8
Access and monitor BOO, TR PIDs.
Are PIDs values normal?
(See PCM INSPECTION [MZI-3.7] .)
Yes
Go to the next step.
No
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.
9
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
© 2005 Mitchell Repair Information Company, LLC.
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
11
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
© 2005 Mitchell Repair Information Company, LLC.
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
© 2005 Mitchell Repair Information Company, LLC.
STEP
INSPECTION
RESULTS
ACTION
1
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.
No
Service if necessary.
Repeat Step 1.
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.
3
Is engine overheating?
Yes
Go to symptom troubleshooting "No.17
Cooling system concerns - Overheating".
No
Go to the next step.
4
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.
No
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
© 2005 Mitchell Repair Information Company, LLC.
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