Tried to run evap test on 1999 chevy tahoe and scan tool came up error and said evap machine wont run 1gnek13rsj493587.Tried several time and kept coming up with error message.
evap test wont run
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What version of software?
Which Evap test?
Purge and Seal or Evap Service Bay Test?
Many times the ESBT will be denied due to codes, engine temp, tank fill, unstable RPM, unstable fuel level etc..
Could you post a screenshot? Use the S button and capture the image.
It sounds like a scanner issue, due to the "Machine" terminology though.
Do you know what version of software you using? That may be helpful.
Thanks, BobComment
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The spec for the fuel level PERCENT-!!! (is SnapOn listening-???) is usually BETWEEN 15% and 85%. The occasional vehicle specs 20% and 88% so just make sure you have a little more than a 1/2 tank.
Take a look at the criteria to enable the system to self test in a bunch of the P044x codes....P0440, P0442 and especially P0446 in your information database such as AllData.....
There should be about 4 different evap tests you can run as Bob says.
Purge solonoid ON/OFF
Vent solonoid ON/OFF
Purge & Seal
Then finally the Evap-Service-Bay-Test, which will raise the ECT temperature allowed to run the test, which is higher than the 38-F to 86-F window that the code criteria requires (aproximate guess here but you get the idea...look at the code charts for details).
This last one, the EVAP Service Bay Test, is not in every GM vehicle's PCM, so I don't use it very often. Sometimes it's there but SnapOn doesn't show it, sometimes it's not in the PCM and SnapOn does show it.
The first three tests should be active regardless of the ECT, IAT and FTL% but the vehicle's self tests and the EVAP SBT do require the enabling criteria to be met.
When you are looking at the fuel-tank-pressure pid, it will show in mmHG for vacuum on your scanner. To convert to INCHES OF WATER COLUMN, as the code charts direct you to look at, use the mmHG value and either multiply or divide by 1.86 and 0.5353, (eg; -14.5 mmHG = 7.76 inH2O)
HTHComment
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