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Old 07-23-2021, 03:47 PM   #1
retiredincary
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Default Driving Cycle

Car is a 2009 Saturn Aura. This morning the battery died and had to be replaced. Unfortunately I have to have the car safety inspected. I took it in and it failed because of replacing the battery. They said I should look up Driving Cycle for 2009 Saturn Aura. I did this, but haven't found anything. Any suggestions on how to get this car to pass inspection would be greatly appreciated.
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Old 07-23-2021, 05:41 PM   #2
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Default Re: Driving Cycle

Here's one link describing GMs (emissions) drive cycle; https://repairpal.com/estimator/satu...cle-test-cost/

Briefly put, every vehicle made since 1996 performs emissions self tests every time the engine is started, car driven, effectively monitoring emissions whenever the engine's running. If there were zero issues (check engine light off) before the battery died and you were due state emissions inspection immediately afterwards, the engine computer lost all emissions parameters from the power disconnect. All you need to do is drive for a few days or so as new emissions parameters are learned and memorized. Not having any error codes before replacing the battery usually means the computer relearns new values and ultimately passes all emissions self tests, ready for emissions inspection.

The best way to determine whether or not your car is ready for emissions inspection is with a reader capable of displaying readiness monitors. Simply plugging in a reader to display readiness status every day should tell you whether self tests of emissions are ready or not. You're concerned with either a READY or NOT READY status on a reader. READY (check engine light off) tells you your car has met federal/state emissions and passes before driving into an inspection station. Some vehicles can learn new values in a single drive while others may require a few days or more as varied daily driving situations are different from one driver to another. Emissions inspectors see the same readiness monitors on their state computers when recording data as most generic readers display.

The computer defaults to factory values but requires a period of approximately 50 miles of combined city/highway driving to fulfill a list of monitors that are learned during the drive cycle. If you search for GMs drive cycle, you'll read of a torturous routine. In reality, simply driving a few days or so will meet the requirements as the emissions program learns new values. These are also referred to as readiness monitors like engine coolant temperatures from cold engine startup until fully warmed up in a predetermined time reference to determine if the thermostat is operating correctly or not. Other monitors are the evaporative emission system to test and ensure the fuel vapors are retained and not vented to the atmosphere, collecting vapors into a charcoal canister via tubing and valves to the fuel tank. Throttle position, map, maf, intake air temperature make up the list of monitors.
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Old 07-25-2021, 06:14 PM   #3
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Default Re: Driving Cycle

See:
https://www.saturnfans.com/forums/sh...85&postcount=7
...
2008 Saturn Aura XE 3.5L 4 spd
2000 Saturn SL1 1.9L SOHC (Retired)
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