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Complete drive cycle before inspection?

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Old 01-12-2011, 06:37 PM
ducktruck ducktruck is offline
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Default Complete drive cycle before inspection?

2001 ram 1500 5.9L

I have to get my truck inspected in the next few days. Is there a more Dodge specific "drive cycle" I should run before taking it in? Or is something like this generic one good?

Any idea how many times I'd have to do this to get it "ready?"

Thanks,
Mike


Quote:
Originally Posted by http://www.lyberty.com/car/drive-cycle.html
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 86F /30C) 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.
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Old 01-12-2011, 07:51 PM
slider15004x4 slider15004x4 is offline
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I have never did anything special before going in for inspection. I just make sure that if I have reset the error codes in the computer recently, I drive around for about 30 miles to allow the PCM to recode itself or whatever it's called and thisisonly done for emissions testing.
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Old 01-12-2011, 09:15 PM
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Why would you have to do a drive cycle? They scan your computer and check what comes out the tailpipe.
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Old 01-12-2011, 09:41 PM
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I just give mine a good Italian tune up before I take it into the bay...
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Old 01-13-2011, 09:55 AM
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Quote:
Originally Posted by PurplDodge View Post
Why would you have to do a drive cycle? They scan your computer and check what comes out the tailpipe.
The computer can return a "not ready" message if the reset was too recent. In my state, AZ, it's an auto fail.
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Old 01-13-2011, 10:01 AM
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Quote:
Originally Posted by slider15004x4 View Post
I have never did anything special before going in for inspection. I just make sure that if I have reset the error codes in the computer recently, I drive around for about 30 miles to allow the PCM to recode itself or whatever it's called and thisisonly done for emissions testing.
Good to hear. Thanks.
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Old 01-13-2011, 10:49 AM
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Quote:
Originally Posted by ducktruck View Post
The computer can return a "not ready" message if the reset was too recent. In my state, AZ, it's an auto fail.
From what I know with my shop is if the PCM is not ready the emissions machine will not allow the test to proceed, but is not an auto fail. It just needs to be tested again. This is in PA.
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Old 01-13-2011, 11:23 AM
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there are rediness codes. after resetting the CEL, the PCM will need to still clear the cycles. In order to due so, you must drive about 200 miles. try to do half highway, and half city driving so the PCM can learn each condition.

I worked as a state inspector, and this is how we got them done.
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Old 01-13-2011, 12:31 PM
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I've never had to drive that far to have the codes cycle but I guess better safe than sorry. It would suck having to go back another time just because the PCM is ready.
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Old 01-13-2011, 05:17 PM
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Well, for what it's worth, it passed. I drove 53 miles after the battery was reconnected. But, I also ran through that "generic drive cycle" routine. Bad experiment, so who knows.

Thanks for the help.
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Last edited by ducktruck; 01-13-2011 at 05:19 PM.. Reason: typo
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