Mazda MX-6 1998, Workshop Manual, Page: 187 / 1282

TROUBLESHOOTING [ENGINE CONTROL FS]
20
FUEL ODOR (IN ENGINE COMPARTMENT)
DESCRIPTION Gasoline fuel smell or visible leaks
POSSIBLE
CAUSE
• Excessive fuel pressure
• Fuel tank vent system blockage
• Purge solenoid valve malfunction
• Charcoal canister malfunction
Warning
Following troubleshooting flow chart contains fuel system diagnosis and repair procedures. Read
following warnings before performing fuel system service:
• 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 leaks 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
REPAIR PROCEDURE” and “AFTER REPAIR PROCEDURE” described in this manual.
ay 0 1 -1 4 BEFORE REPAIR PROCEDURE
c r 0 1 -1 4 AFTER REPAIR PROCEDURE
STEP INSPECTION
ACTION
1
Visually check for fuel leakage at fuel injector
O-ring, pressure regulator and fuel line.
Service as necessary.
Install fuel pressure gauge between fuel filter
and fuel delivery pipe.
Start engine and run at idle.
Does fuel line pressure remain at specification
for 60 seconds when Ignition switch Is turned
ON and OFF?
Fuel line pressure
More than 150 kPa
{1.5 kgf/cm2, 21 psi}
Yes Go to next step.
No Check pressure regulator for high pressure cause.
2 Check for blockage/restriction or open
between engine vacuum port and charcoal
canister.
Check for blockage in fuel tank vent system.
Is fault indicated? Yes Replace vacuum hose.
No Go to next step.
3 Check purge solenoid valve.
Is solenoid operating properly? Yes Go to next step.
No Replace purge solenoid valve.
4 Retrieve and record any continuous memory,
KOEO and KOER DTCs.
Are there any DTCs displayed?
Yes Go to appropriate DTC test.
No Check charcoal canister for fuel saturation. If excess
amount of liquid fuel present, replace charcoal canister.
5 Verify test results. If okay, return to diagnostic index to service any additional symptoms.
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