Mazda MX-6 1998, Workshop Manual

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TROUBLESHOOTING [ENGINE CONTROL KL]
DTC P0455 Evaporative emission control system leak detected (Gross leak)
DESCRIPTION
• DTC P0455 indicates substantial leak or blockage has been detected in Evaporative
Emission System.
[Possible Cause]
• Purge solenoid valve malfunction • Barometric absolute pressure sensor malfunction
• CDCV malfunction • Fuel tank level sensor malfunction
• Loose fuel filler cap • Fuel tank pressure sensor malfunction
• Charcoal canister malfunction • Engine coolant temperature sensor malfunction
• Catch tank malfunction • Intake air temperature sensor malfunction
• Pressure control valve malfunction • Throttle position sensor malfunction
• Cracked fuel tank • Mass air flow sensor malfunction
• Fuel tank component parts poorly installed • Vehicle speed sensor malfunction
• Evaporative hose damaged or loose • Poor connection of connector
• Insufficient manifold absolute pressure
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.
c r 0 1 -1 4 BEFORE REPAIR PROCEDURE
c r 0 1 -1 4 AFTER REPAIR PROCEDURE
STEP INSPECTION ACTION
1 CHECK FOR OTHER CONTINUOUS
MEMORY DTC
Check for other Continuous Memory DTCs
which could cause this DTC.
• Key off.
• NGS tester connected.
• Key on, engine off.
• Retrieve and record any Continuous
Memory DTCs.
• Are there any other continuous Memory
DTCs present?
Yes DISREGARD Evaporative Emission Monitor DTC at this
time.
Go to appropriate DTC test.
No Go to next step.
2 CHECK FOR KEY ON ENGINE OFF (KOEO)
SELF TEST
• Activate key on, engine off (KOEO) self
test.
• Are any Key On Engine Off DTCs
displayed?
Yes Go to DTC charts and PROCEED as required.
No
Go to next step.
3
CHECK FOR KEY ON ENGINE RUNNING
(KOER) SELF TEST
• Key on, engine running.
• Warm up engine to normal operating
temperature.
• Activate key on, engine running (KOER)
self test.
• Are any key On Engine Running DTCs
displayed?
Yes Go to DTC charts and PROCEED as required.
No
Go to next step.
4 CHECK FOR INTAKE MANIFOLD VACUUM
• Key off.
• Attach vacuum gauge to intake manifold
vacuum source beside purge control
system.
• Key on, engine running.
• Warm up engine to normal operating
temperature.
• Measure intake manifold vacuum.
•
Did manifold vacuum rise above 54 kPa
{407 mmHg, 16 InHg}.
Yes DISCONNECT vacuum gauge.
RECONNECT all components.
Go to next step.
No INSPECT and SERVICE troubles on air intake and
engine.
RECONNECT all components.
RESET PCM to completely clear DTCs.
tr After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
0 1 -0 1 B -7 6