lexusjoe7

I purchased a 2010 LX450h with 20,000 miles in September. In the process of checking everything out, I ran into a OBD2 scantool reading that I don't understand. First, the check engine light is not on, and all of the applicable OBD monitor tests are marked pass. There are no current or pending codes. When I look at the detail of the mode 06 test results, all are passed except four tests listed as fail in the category of Purge Tests. These are shown in the attachment. I have disconnected the battery a couple of times to reset things, After several days when all of the monitor tests have completed, the same four Purge tests always show as fail. They don't seem to mean much because they are not keeping the on-board evaporative test from passing, They are failing because the max value is listed as 0. I was curious if anyone else has noticed this or understands what this means.

Tnx joe

FamilyRX

The $D4 is the test for the Purge VSV in the stuck closed position, measured in kPa. The fault code that would set is P0441. I believe the remaining $FF TIDs are reserved values for the manufacturer as I have not seen that test ID listed for the EVAP monitor.

My best guess for the $D4 is that the test has not passed because the test conditions have not been fully satisfied. Some scan tools will list this as "disabled" or "pending". For the $FF tests, I think they are just placeholders in the software.

These are my best guesses based on the information given.

HTH

FamilyRX
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