***How long is a drive cycle?*** - The Saab Link Forums

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Car Problems? NG900 or old 9-3 Only If you're experiencing problems with your NG900 or 9-3, post your question in here. CEL Code or GTFO!

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Old 05-28-2006, 07:45 AM   #1
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***How long is a drive cycle?***

So, how long is it? I had a CEL after Carlisile. Long story short, I think it was something stupid like not having the gas cap on tight enough...

So I reset my battery, and 213 miles later, still no CEL. My car is due for inspection this month (3 days or so). So have I completed a drive cycle yet?
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Old 05-28-2006, 07:54 AM   #2
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do a bit of searching....

and look what shows up

https://www.saablink.net/forum/showth...ht=drive+cycle

basically all those requirements need to bemet, to have the drive cycle be complete. 200 something miles, may or may not be enough.

Go out and do those steps and then you should know for sure.
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Old 05-28-2006, 09:00 AM   #3
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Quote:
Originally Posted by WyldSaabMan
do a bit of searching....

and look what shows up

https://www.saablink.net/forum/showth...ht=drive+cycle

basically all those requirements need to bemet, to have the drive cycle be complete. 200 something miles, may or may not be enough.

Go out and do those steps and then you should know for sure.
Thanks for the info...forgot to even search. Without doing that procedure, which I will try, isnt there a certain mileage that is usually reccomended before you can pronounce the CEL gone? I think its around 100-200 miles, but can anyone confirm this? I just dont know when I can try this test because I'm at the beach and its almost impossible to accelerate and hold a speed described in the check list.
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Old 05-28-2006, 10:11 AM   #4
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Quote:
Generic OBD II "Drive Cycle"

Most OBD II ("On-Board Diagnostics II") diagnostic monitors will run at some time during normal operation of the vehicle.
However, to satisy all of the different Trip enable criteria and run all of the OBD II diagnostic monitors, the vehicle must be driven under a variety of conditions. The following drive cycle will (theoretically) allow all monitors to run on (??) vehicle. (Note: Drive cycle specifics vary by vehicle!)

1. Ensure that the fuel tank is between 1/4 and 3/4 full.
2. Start cold (below 86°F /30°C) and warm up until engine coolant temperature is at least 160° F (typically requires at least one minute; up to 3 minutes).
3. Accelerate to 40-55 MPH at 25% throttle and maintain speed for five minutes.
4. Decelerate without using the brake (coast down) to 20 MPH or less, then stop the vehicle. Allow the engine to idle for 10 seconds, turn the key off, and wait one minute.
5. Restart and accelerate to 40-55 MPH at 25% throttle and maintain speed for two minutes.
6. Decelerate with using the brake [or the clutch!] by coasting down to 20 MPH or less, then stop the vehicle. Allow the engine to idle for 10 seconds, turn the key off, and wait one minute.

General Motors (specific) OBD II Drive Cycle

Performing a GM OBDII Driving cycle:

1. Cold Start. In order to be classified as a cold start the engine coolant temperature must be below 122°F (50°C) and within 11°F (6°C) of the ambient air temperature at startup.
Do not leave the key in prior to the cold start or the heated oxygen sensor diagnostic may not run.
2. Idle. The engine must be run for two and a half minutes with the air conditioner on and rear defroster on. The more electrical load you can apply the better. This will test the O2 heater, Passive Air, Purge "No Flow", Misfire, and - if closed loop is achieved- Fuel Trim.
3. Accelerate. Turn off the air conditioner and all the other loads and apply half throttle until 55mph (88km/hr) is reached. During this time the Misfire, Fuel Trim, and Purge Flow diagnostics will be performed.
4. Hold Steady Speed. Hold a steady speed of 55mph (88km/hr) for 3 minutes. During this time the O2 response, air Intrusive, EGR, Purge, Misfire, and Fuel Trim diagnostics will be performed.
5. Decelerate. Let off the accelerator pedal. Do not shift, touch the brake or clutch. It is important to let the vehicle coast along gradually slowing down to 20 mph (32km/hr). During this time the EGR, Purge and Fuel Trim diagnostics will be performed.
6. Accelerate. Accelerate at 3/4 throttle until 55-60mph (88-96 km/hr). This will perform the same diagnostics as in step 3.
7. Hold Steady Speed. Hold a steady speed of 55mph (88km/hr) for five minutes. During this time, in addition to the diagnostics performed in step 4, the catalyst monitor diagnostics will be performed. If the catalyst is marginal or the battery has been disconnected, it may take 5 complete driving cycles to determine the state of the catalyst.
8. Decelerate. This will perform the same diagnostics as in step 5. Again, don't press the clutch or brakes or shift gears.

Further useful information:
http://lyberty.com/car/drive-cycle.html

got this from mike s
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Old 05-28-2006, 06:41 PM   #5
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Buehler? Buehler?


Anyone know many miles are reccomended to pronounce a CEL "gone?"
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Old 05-28-2006, 06:53 PM   #6
 
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I don't think it can be any more clear.

The whole point of that drive cycle post was to say that there really isn't any specific mileage requirement. The ECU needs to run through its series of diagnostic tests, factoring in time and speed driven, not miles driven.
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Old 05-28-2006, 07:02 PM   #7
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Quote:
Originally Posted by mike saunders
I don't think it can be any more clear.

The whole point of that drive cycle post was to say that there really isn't any specific mileage requirement. The ECU needs to run through its series of diagnostic tests, factoring in time and speed driven, not miles driven.

Thanks Mike, I just figured if I drove "X" number fo miles I would be able to not worry about the CEL.

I just wont be able to run that test for a little bit until I get home, and was wondering about the # of miles I had to travel to not worry about the CEL anymore.
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Old 05-28-2006, 07:07 PM   #8
 
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The mileage thing is odd.

If you drive a 50 miles "normally," say a mix of highway and city driving, you might fulfill the drive cycle. If you drive 200 miles at 30 mph, you still won't fulfill the drive cycle requirements, so the CEL won't clear....or it won't return if there's still a problem.

That's why it's so tricky....
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Old 05-28-2006, 07:24 PM   #9
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Quote:
Originally Posted by mike saunders
The mileage thing is odd.

If you drive a 50 miles "normally," say a mix of highway and city driving, you might fulfill the drive cycle. If you drive 200 miles at 30 mph, you still won't fulfill the drive cycle requirements, so the CEL won't clear....or it won't return if there's still a problem.

That's why it's so tricky....
Yea I hear ya, I will just have to do the test. Thanks again, Mike.
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