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Engine Computer Reset For Smog Test
http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=65973		 Page 1 of 1
Author:  yakers [ Wed Mar 21, 2012 1:44 pm ]
Post subject:  Engine Computer Reset For Smog Test
Does anyone know the procedure for resetting the CRD Computer (power control module?) for smog tests? I was advised by both the dealer/mechanic and smog shop that my Jeep needs to run some time (dealer said 200 miles) before it can be tested for smog. Evidently in the 90's people just cleared off their codes and had a quick smog check, imagine that. Now there is some system that requires some use in miles and types of driving (heard 30 cold starts) before a smog test can be taken. Is this true for our CRD too? Is there some formula to follow?
Author:  fratichelli [ Wed Mar 21, 2012 1:49 pm ]
Post subject:  Re: Engine Computer Reset For Smog Test
I don't know if yours is different, but for a 2002, you turn the ignition on without cranking. If after 20 seconds the engine light goes out it is ready for a smog test.
Author:  papaindigo [ Wed Mar 21, 2012 2:56 pm ]
Post subject:  Re: Engine Computer Reset For Smog Test
Some degree of truth some degree of total BS. See http://www.arb.ca.gov/msprog/obdprog/obdfaq.htm and search for the word "readiness". Apparently on an OBD II system if codes have been recently reset or repairs made the system takes a bit of driving before it essentially gets to the point where the system is ready to start monitoring and until that happens there is a not ready flag set. The above site says drive for a week or so to clear all the readiness flags.

I presume if you failed because of readiness flags they were telling you to drive a bit before coming back. On the other hand if they did not do an OBD II test at all and just told you to drive that's BS.
Author:  fratichelli [ Wed Mar 21, 2012 3:20 pm ]
Post subject:  Re: Engine Computer Reset For Smog Test
From the manual.

Normally, the OBD II system will be ready. The OBD II system may not be ready if your vehicle was recently serviced, recently had a dead battery or a battery replacement.

If the OBD II system should be determined not ready for the I/M test, your vehicle may fail the test.

Your vehicle has a simple ignition key-actuated test, which you can use prior to going to the test station. To check if your vehicle’s OBD II system is ready, you must do the following:

1. Turn the ignition switch to the ON position, but do not crank or start the engine.

2. If you crank or start the engine, you will have to start this test over.

3. As soon as you turn the ignition switch to the ON position, you will see the MIL symbol come on as part of a normal bulb check.

4. Approximately 15 seconds later, one of two things will happen:

a. The MIL will flash for about 10 seconds and then return to being fully illuminated until you turn OFF the ignition or start the engine. This means that your vehicle’s OBD II system is not ready and you should not proceed to the I/M station.

b. The MIL will not flash at all and will remain fully illuminated until you turn OFF the ignition or start the engine. This means that your vehicle’s OBD II system is ready and you can proceed to the I/M station.

If your OBD II system is not ready, you should see your authorized dealer or repair facility. If your vehicle was recently serviced or had a battery failure or replacement, you may need to do nothing more than drive your vehicle as you normally would in order for your OBD II system to update. A recheck with the above test routine may then indicate that the system is now ready.

Regardless of whether your vehicle’s OBD II system is ready or not, if the MIL is illuminated during normal vehicle operation you should have your vehicle serviced before going to the I/M station. The I/M station can fail your vehicle because the MIL is on with the engine running.
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