EVAP monitor incomplete

Tiny
MACGUNTHER
  • MEMBER
  • 2003 TOYOTA TUNDRA
  • V8
  • 2WD
  • AUTOMATIC
  • 179,000 MILES
Scan tool says evap monitor incomplete but has no check engine light.
Saturday, May 30th, 2020 AT 3:32 PM

3 Replies

Tiny
KASEKENNY
  • MECHANIC
  • 18,907 POSTS
This monitor needs to run in order for the system to operate properly. It will run just under normal driving, you just have to give it time.
However, I attached the process to force it to run if you want to perform this procedure.

Let me know if you have questions. Thanks
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Saturday, May 30th, 2020 AT 3:45 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,452 POSTS
To add some info, the lack of the monitor itself being set would not set a code to trigger the check engine light. However there could be a reason it hasn't set that just has not triggered the light yet.
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Saturday, May 30th, 2020 AT 8:06 PM
Tiny
KASEKENNY
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Good point Steve. I did not think about a pending code which will not show up on some generic code readers until it goes active.

So if you run the procedure and the monitor does not pass then scan for codes with a scan tool that we know will pick up pending codes.

Keep us posted. Thanks.
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Saturday, May 30th, 2020 AT 8:57 PM

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