Last post on Jul 17, 2012 at 8:21 PM
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Toyota Sienna, Scheduled Maintenance, Van
#1 of 2 SMOG test fails - O2 and EVAP not ready.
Jul 16, 2012 (2:09 pm)
I needs some help here for 2004 Siena LE with 8 seats.
This car is daily driven, without disconnecting battery or jump-start
after the repalement of old battery four years ago.
Its SMOG inspection fails because of MIL/ODB II not ready at California.
When I use a scanner, I find that there have two monitors not ready
1): O2 sensor 2): EVAP.
1): There has NO error code, (completed or pending).
2): MIL (Check Engine Light) is NOT on.
3): Five monitors (misfire, fuel, comp, caly, and o2 Heater ) are completed.
During 06/13 - 07/04 three weeks, the van only has been driven
two times (since the owner is traveled out of USA). After 7/04,
the van has been driven daily with about 150 miles. Driving
looks noraml in any conditions. There has NO OEM part
replacement about 02 sensor or EVAP system. The SMOG technican
told me to drive more time and check again in a week.
Any comments? Thanks.
#2 of 2 Re: SMOG test fails - O2 and EVAP not ready. [shued]
Jul 17, 2012 (8:21 pm)
Unfortunately, we don't know why it's not in a readiness state on all tests, or how long it has been that way. Did sitting cause it (doubtful, but you never know. Never heard of readiness timing out, but there is always a first), or has it been stuck here forever?
I think I would try a total reset and see if it will fight it's way back to full readiness status, or if something else is major wrong that's preventing it. Either thru the OBD port or disconnect the battery and step on the brake to crash any retained power in the system.
If you reset it, be prepared for it to idle / run poorly for a few days and up to 100 miles. There is a TSB about throttle-by-wire systems (they don't use an idle air control valve) being sensitive to recalibration after ECU interruptions. You may have to clean the throttle body so that the butterfly can find the right angle for air/fuel mixture.