Mazda MX-6 1998, Workshop Manual, Page: 194 / 1282

TROUBLESHOOTING [ENGINE CONTROL FS]
29 FUEL FILL ISSUES
DESCRIPTION Fuel tank does not fill smoothly
POSSIBLE
CAUSE
• Clogged evaporative emission pipes
• Non return valve malfunction
• Fuel tank pressure control valve malfunction
• Improper use of fuel nozzle
• Inadequate fuel filling speed
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.
xr 0 1 -1 4 BEFORE REPAIR PROCEDURE
xr 0 1 -1 4 AFTER REPAIR PROCEDURE
STEP INSPECTION
ACTION
1 Retrieve and record any continuous memory
KOEO and KOER DTCs.
Are there any DTCs displayed?
Yes DTC displayed:
Go to appropriate DTC test.
No No DTC displayed:
Go to next step.
2
Remove fuel filler pipe.
Make sure non return valve is installed
properly.
Check non return valve operation.
Is non return valve okay?
Yes Check as followings:
• Improper use of fuel nozzle
• Inadequate fuel filling speed
• Fuel tank pressure control valve
No If non return valve installed improperly:
Reinstall non return valve to proper position.
If non return valve does not operate properly:
Replace non return valve.
30 FUEL FILLING SHUT OFF ISSUES
DESCRIPTION Fuel does not shut off properly
POSSIBLE
CAUSE
• Clogged evaporative emission pipes
• Non return valve malfunction
• Fuel shut off valve malfunction
• Fuel nozzle malfunction
• Fuel nozzle does not insert correctly
STEP
INSPECTION ACTION
1 Retrieve and record any continuous memory,
KOEO and KOER DTCs.
Is there any DTC displayed?
Yes, DTC displayed:
Go to appropriate DTC test.
No No DTC displayed:
Go to next step.
2 Remove fuel filler pipe.
Make sure that non return valve installed
properly.
Check non return valve operation.
Is non return valve okay?
Yes Check as following:
• Fuel nozzle malfunction
• Fuel does not insert correctly
• Fuel shut off valve
No If non return valve installed improperly:
Reinstall non return valve to proper position.
If non return valve does not operate properly:
Replace non return valve.
0 1 -0 1 A -1 6 6