Mazda MX-6 1998, Руководство по ремонту

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TROUBLESHOOTING [ENGINE CONTROL FS]
DTC P0442 Evaporative emission control system leak detected (Small leak)
DESCRIPTION
• DTC P0442 indicates leak has been detected [as small as 1 mm (0.040 inch)] in
Evaporative Emission System.
[Possible Cause]
• Purge solenoid valve malfunction • Fuel tank level sensor malfunction
• Canister Drain Cut Valve (CDCV) malfunction • Fuel tank pressure sensor malfunction
• Loose fuel filler cup • Engine coolant temperature sensor malfunction
• Charcoal canister malfunction • Intake air temperature sensor malfunction
• Catch tank malfunction • Throttle position sensor malfunction
• Pressure control valve malfunction • Mass air flow sensor malfunction
• Cracked fuel tank • Vehicle speed sensor malfunction
• Fuel tank component parts poorly installed • Poor connection of connector
• Evaporative hose damaged or loose
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.
tr 0 1 -1 4 BEFORE REPAIR PROCEDURE
o - 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 Evaporative Emission
Monitor 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
Go to appropriate DTC test.
DISREGARD Evaporative Emission Monitor DTC at this
time.
No Go to next step.
2 CHECK FOR KOEO SELF TEST
• Activate key on, engine off (KOEO)
self-test.
• Are any KOEO DTCs displayed?
Yes Go to appropriate DTC test.
No Go to next step.
3
CHECK FOR KOER SELF TEST
• Key on, engine running.
• Warm up engine to normal operating
temperature.
• Activate key on, engine running (KOER)
self-test.
• Are any KOER DTCs displayed?
Yes Go to appropriate DTC test.
No Go to next step.
4 INSPECTION OF FUEL FILLER CAP
• Key off.
• Disconnect NGS tester.
• Confirm filler cap is not either
disconnected, loose or damaged.
Note
• When filler caps other than order entry
system (OES) caps are attached, it is
considered abnormal.
• Is fault detected?
Yes REPLACE or PROPERLY attach the filler cap.
RESET PCM to completely clear DTCs.
c r After Repair Procedure
COMPLETE OBD II Drive Mode.
RERUN OBD Test.
No Go to next step.
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