NO.20 FUEL ODOR (IN ENGINE COMPARTMENT) [MZI-3.7]

id0103d2802600

20

FUEL ODOR (IN ENGINE COMPARTMENT)
DESCRIPTION
•  Gasoline fuel smell or visible leakage.
POSSIBLE CAUSE
•  Fuel leakage from fuel system
•  Excessive fuel line pressure
―  Pressure regulator malfunction (built-in fuel pump unit)
•  Fuel tank vent system blockage
•  Purge solenoid valve malfunction
•  PCM DTC is stored.
•  Charcoal canister malfunction
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.

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION
1
Visually inspect for fuel leakage at fuel injector O-ring and fuel line.
Service if necessary.
Install the fuel pressure gauge between fuel pipe and fuel distributor.
Start the engine and idle it.
Measure the fuel line pressure during idle.
(See FUEL LINE PRESSURE INSPECTION [MZI-3.7].)
Is the fuel line pressure correct during idle?
Yes
Go to the next step.
No
Replace the fuel pump unit. (Pressure regulator malfunction)
(See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZI-3.7].)
2
Inspect for following:
•  Blockage/restriction or open circuit in wiring harness between engine vacuum port and charcoal canister
•  Blockage in fuel tank vent system
Is there any malfunction?
Yes
Replace the vacuum hose.
No
Go to the next step.
3
Inspect the purge solenoid valve.
(See PURGE SOLENOID VALVE INSPECTION [MZI-3.7].)
Is the solenoid operating properly?
Yes
Go to the next step.
No
Replace the purge solenoid valve.
(See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [MZI-3.7].)
4
Turn the ignition switch to the ON position (Engine off).
Retrieve any PCM DTCs using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [MZI-3.7].)
Are there any DTCs displayed?
Yes
DTC is displayed:
•  Go to the appropriate DTC inspection.
No
No DTC is displayed:
•  Inspect the charcoal canister for fuel saturation.
―  If excess amount of liquid fuel is present, replace the charcoal canister.
5
•  Verify test results.
―  If normal, return to diagnostic index to service any additional symptoms.
―  If malfunction remains, inspect related Service 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.