Mazda CX-9 Grand Touring 2009 Manual page 1367

Collapsed or restricted
intake-air system
Restricted fuel return line
4
Are all items normal?
Connect the M-MDS to the DLC-
2.
Turn the ignition switch to the
5
ON position (Engine off).
Retrieve any DTCs.
Are there any DTCs displayed?
Install the fuel pressure gauge
between the fuel pipe and the fuel
distributor.
Start the engine and idle it.
Measure fuel line pressure during
6
idle.
Is fuel line pressure correct during
idle?
(See FUEL LINE PRESSURE
INSPECTION [MZI-3.7] .)
Perform the spark test.
(See ENGINE CONTROL
SYSTEM OPERATION
7
INSPECTION [MZI-3.7].)
Is strong blue spark visible at
each cylinder?
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
8
Information and perform repair or diagnosis.
NO.20 FUEL ODOR (IN ENGINE COMPARTMENT) [MZI-3.7]
2008 Mazda CX-9 Grand Touring
2008 ENGINE Symptom Troubleshooting (MZI-3.7) - Mazda CX-9
No
Yes
No
Yes
No
Yes
No
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] .)
Service if necessary.
Repeat Step 4.
DTC is displayed:
Go to the appropriate DTC inspection.
(See DTC TABLE [MZI-3.7] .)
No DTC is displayed:
Go to the next step.
Go to the next step.
Low:
Inspect the fuel line for clogging.
If there is no malfunction, replace the fuel pump
unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION [MZI-3.7] .)
High:
Replace the fuel pump unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION [MZI-3.7] .)
Inspect the CMP sensor.
(See CAMSHAFT POSITION (CMP) SENSOR
INSPECTION [MZI-3.7] .)
Repair or replace the malfunctioning part according
to spark test result.