No.20 Fuel Odor (In Engine Compartment)[L3 With Tc] - Mazda CX-7 2007 Workshop Manual

SYMPTOM TROUBLESHOOTING [L3 WITH TC]

NO.20 FUEL ODOR (IN ENGINE COMPARTMENT)[L3 WITH TC]

20 FUEL ODOR (IN ENGINE COMPARTMENT)
DESCRIPTION Gasoline fuel smell or visible leakage
• Excessive fuel pressure
• Purge solenoid valve malfunction
• Fuel system vent system blockage
• Evaporative gas leakage
• Improper connection of evaporative related vacuum hoses
• Charcoal canister malfunction
• Fuel leakage from fuel system
Warning
The following troubleshooting flow chart contains the fuel system diagnosis and repair
procedures. Read the following warnings before performing the fuel system services:
• Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always
POSSIBLE CAUSE keep sparks and flames away from fuel.
• Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or
death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete
"BEFORE REPAIR ROCEDURE" and "AFTER REPAIR PROCEDURE" described in this
manual.
Caution
• Disconnecting/connecting the quick release connector without cleaning it may possibly
cause damage to the fuel pipe and quick release connector. Always clean the quick release
connector joint area before disconnecting/connecting, and make sure that it is free of
foreign material.
Diagnostic procedure
STEP INSPECTION
1 Visually inspect fuel leakage at fuel line.
Is there any fuel leakage?
2 Inspect the vacuum hose routine.
(See01-13-4 VACUUM HOSE ROUTING
DIAGRAM[L3 WITH TC].)
Are vacuum hoses routines properly?
3 Perform the Evaporative Emission (EVAP)
System Leak Inspection.
(See01-03-78 ENGINE CONTROL SYSTEM
OPERATION INSPECTION[L3 WITH TC].)
Is there any problem found?
4 Inspect the airflow of purge solenoid valve.
(See01-16-9 PURGE SOLENOID VALVE
INSPECTION[L3 WITH TC].)
Is the purge solenoid airflow properly?
5 Connect the M-MDS to the DLC-2.
Access the FUEL_PRESPID.
Monitor the FUEL_PRES PID while idle and race
the engine.
Is the FUEL_PRES PID indicate15 MPa {153
2
kgf/cm , 2175 psi} or less?
5 Verify test results.
• If normal, return to the diagnostic index to service any additional symptoms.
• If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the
repair or diagnosis.
— If the vehicle is repaired, troubleshooting is completed.
— If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later
calibration is available. Retest.
End Of Sie
(See01-14-4 BEFORE REPAIR PROCEDURE[L3 WITH TC].)
(See01-14-4 AFTER REPAIR PROCEDURE[L3 WITH TC].)
RESULTS
Yes Service if necessary.
No Go to the next step.
Yes Go to the next step.
No Reconnect the vacuum hose.
Yes Repair or replace suspected part according to the
inspection results.
No Go to the next step.
Yes Go to the next step.
No Replace the purge solenoid valve.
Yes Inspect the charcoal canister for fuel saturation.
If excess amount of liquid fuel is present, replace the
charcoal canister.
No Inspect the fuel pressure sensor and the high pressure
fuel pump.
(See01-40-35 FUEL PRESSURE SENSOR
INSPECTION[L3 WITH TC].)
(See01-14-19 HIGH PRESSURE FUEL PUMP
INSPECTION[L3 WITH TC].)
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ACTION
01-03–65
01-03