Drive cycle questions - Toyota Nation Forum : Toyota Car and Truck Forums
Corolla 9th Gen/1st Gen Matrix (2003-2008) 9th generation Corolla and 1st generation Matrix discussion.

 
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post #1 of 10 Old 12-03-2017, 03:39 PM Thread Starter
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Drive cycle questions

Hi, I drive a 2003 corolla s, 4 cylinder. I'm trying to get it smogged. Check engine light was on a few months ago, code was P0420. I then disconnected the battery to swap out my radio. Code was cleared, I waited for it to come back. It didn't. OK, must be something transient I think.

Flash forward to last week. I go to get my car smogged and fail because a number of tests aren't ready. Mechanic gives me vague directions on how to do a drive cycle. I look up more specific directions. They include:
1. starting the drive cycle after the car has sat for 8 hours, and idling for 3 minutes
2. Driving at 40 mph for 10 minutes

I keep forgetting to stop and let the engine idle when I get into my car to get somewhere, and there isn't anywhere around me where I can drive 40 (highway speed is 65, streets are 30)

Do I have to do all of these exact things for a drive cycle, in sequence, all together to perform one whole and complete drive cycle in one sitting, or will it work if I do each component of them, and not necessarily in order? Apparently it's not "a normal driving cycle" for me
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post #2 of 10 Old 12-03-2017, 03:41 PM Thread Starter
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Basically, if I don't perform all of the actions that result in a complete drive cycle for the ecu all in sequence in one sitting, do I have to wait till the next day for my engine to cool down to room temperature and attempt to do a complete cycle in one sitting? Or are the tests run independently and the ecu records a result once each of them has been independently completed?
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post #3 of 10 Old 12-03-2017, 04:29 PM Thread Starter
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Ok, using a better code reader, looks like the catalyst monitor test isn't ready. How do I make it ready? Doea the service bulletin for the 2002 corolla apply to the 2003 corolla?
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post #4 of 10 Old 12-03-2017, 10:47 PM
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http://justsmogs.com/2016/05/1996-to...rive-patterns/ You must let it idle until warmed up (temp gauge in the middle), it will take 5-15 mins of idling in cold weather. Then go out and drive a mix of city and highway. Come back and do it again the next day. It may take several attempts and warm up cycles to complete the drive cycle.
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post #5 of 10 Old 12-03-2017, 11:09 PM Thread Starter
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Are there any actions that will spoil an attempt at running a cycle and require you to start over? I tried driving it according to the Toyota 2002 ECU service bulletin (start hot, drive at 40-55 for 7 minutes, then slow down to 35-45 for 7 minutes) on the freeway.

Are there exact guidelines? The graph they show implies to me that it's 7 unbroken minutes of driving within that exact range, neither going over or under, soft accel and decel, no stops and no turning off in between. Can I, for instance, stop or slow down? What if I momentarily exceed those speeds? What if I drive at those speeds for those exact amounts of time? Does the test have to repeat a certain number of times?

Is there anyone that knows how the software for ECUs operates? Is there a guaranteed, testable, and repeatable way to make the ECU run the test and return a usable result that will pass smog?
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post #6 of 10 Old 12-03-2017, 11:27 PM
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every car has specific monitor parameters... the 'real world' parameter is 'drive it for a week'... that will set the most stubborn of monitors...




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post #7 of 10 Old 12-06-2017, 07:59 AM
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Never heard of a drive cycle, lol... weird.

Here before we smog, we usually just drive it a mix of city and highway... people will usually tell you to take it on the highway and give it a good spirited drive before going back to the emission center, this way the engine is fully warmed up.



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post #8 of 10 Old 12-25-2017, 08:51 PM
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IME, my code reader says if the "readiness monitors" are OK. You might have warm up cycles to get increment.
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post #9 of 10 Old 12-25-2017, 10:30 PM
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About an hour on the highway driving normally with traffic (accelerating and coasting as normal) should clear the cat monitor, if it's still hanging it may be on the threshold of failing and passing.
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post #10 of 10 Old 12-30-2017, 09:23 PM
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Are you in California? The only monitor that does not need to be ready is egr. Hard to believe that the cat monitor isn't ready. You may have an issue with one or both o2 sensors. Could also be a cat problem.

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