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1999 Toyota Corolla EVAP Malfunction

Tiny
ANGLING
  • MEMBER
  • 1999 TOYOTA COROLLA
  • 4 CYL
  • FWD
  • AUTOMATIC
  • 175,000 MILES
I have a code of po440 which says I have a " evap emissions control system malfunction" on my code reader. How do I know what to replace in the system? Should I replace one thing at a time and take a hap hazard approach? Will this be costly? Are there tests I could make? Are the tools expensive for these tests?
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Thursday, June 12th, 2008 AT 10:02 PM

1 Reply

Tiny
MMPRINCE4000
  • MECHANIC
  • 8,548 POSTS
You would need a factory manual which has a flowchart that describes specific steps to isolate the problem e.G. "If 12V at terminal C, then go to step 3, otherwise replace (specific part)".
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Monday, June 16th, 2008 AT 6:59 AM

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