NO.20 FUEL ODOR (IN ENGINE COMPARTMENT) [MZR 1.3, MZR 1.5]

id0103d7802600

20

FUEL ODOR (IN ENGINE COMPARTMENT)
DESCRIPTION
•  Gasoline fuel smell or visible leakage.
POSSIBLE CAUSE
•  Excessive fuel pressure
―  Restriction in fuel line
―  Pressure regulator malfunction (built-into fuel pump unit)
―  Fuel pump mechanical malfunction
•  Fuel leakage from fuel system
•  Fuel injector malfunction
•  Fuel tank vent system blockage
•  Purge solenoid valve malfunction
•  Charcoal canister malfunction
•  Continuous memory DTC is stored
•  Charcoal canister malfunction
•  PCM malfunction
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 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 [MZR 1.3, MZR 1.5].) (See AFTER SERVICE PRECAUTION [MZR 1.3, MZR 1.5].)
Caution
•  Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to 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

RESULTS

ACTION
1
INSPECT FUEL LINE PRESSURE
•  Visually inspect for fuel leakage at the fuel injector O-ring and fuel line.
•  Install the fuel pressure gauge between fuel pipe and fuel distributor.
•  Start the engine and idle it.
•  Measure the fuel line pressure during idle.
•  Is there any malfunction?
Yes
Replace the fuel pump unit.
(See FUEL PUMP UNIT REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)
No
Go to the next step.
2
INSPECT FUEL TANK VENT SYSTEM
•  Inspect for blockage/restriction or open between engine vacuum port and charcoal canister.
•  Inspect for blockage in the fuel tank vent system.
•  Is there any malfunction?
Yes
Replace the vacuum hose.
No
Go to the next step.
3
INSPECT PURGE SOLENOID VALVE
•  Inspect the purge solenoid valve operation.
•  Is there any malfunction?
Yes
Replace the purge solenoid valve.
(See PURGE SOLENOID VALVE REMOVAL/INSTALLATION [MZR 1.3, MZR 1.5].)
No
Go to the next step.
4
VERIFY PCM DTC
•  Perform the PCM DTC inspection using the M-MDS.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZR 1.3, MZR 1.5].)
No
Inspect the charcoal canister for fuel saturation.
•  If an excess amount of liquid fuel is present:
―  Replace the charcoal canister.
5
Verify test results.
•  If normal, return to the diagnostic index to service any additional symptoms.
•  If the malfunction remains, inspect the related Service 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, replace the PCM.