TJ Drive Cycle... Reset Monitors for Smog Test

**SuperWade2** · 02-07-2011, 08:07 PM

This is as much a question as it is me working thru an issue and talking to myself, maybe it will help someone down the road...

My Cali TJ has an incomplete registration... I can't get it smogged because I have 2 monitors that have not "reset" since the last last battery disconnect. This doesn't mean it can't pass the test, it means the test machines won't even run the tests.

In short here is what I've done since reconnecting battery a couple weeks ago.

No Check Engine Light (before or after battery disconnect), No Stored ECU Fault Codes per ODB2 Reader
Driven ~150 Miles since reconnecting battery, mix of Hwy, City, Short Trips, Medium trips (40-50 mi).
Probably 30 or so Cold to Warm Starts

These are the two monitors that are "Incomplete" per the Smog Machine at Shop as well as my Android ODB2 App (Torque) as seen here.

I've found a couple posts from past threads that discuss The "Chrysler Drive Cycle" to reset the monitors (and tired to quote the original posters)

Quote:

Originally Posted by Jonny Jeep

The chysler drive cycle may help...

http://www.obd2.com/support/reprog/d..._procedure.pdf

Quote:

Originally Posted by jgorm

Here is the Chrysler drive cycle.
Rick Escalambre

You only need 1 cold start and 2 hot starts.

Quote:

Originally Posted by Jerry Bransford

The TJ's OBDII PCM (computer) won't pass diagnostics in many states including California until it has had somewhere between 30 and 50 full cold to warm starts. In other words, you can't just sit there and start the engine repeatedly to clear the DTC that says it was recently reset.

Quote:

Originally Posted by robncar

Try this...

Readiness code reset routine:

Start engine, idle cold for approx. 2 min, 10 secs.

Accelerate to 20-30 MPH, Maintain steady speed for approx 3 min, 15 secs.

Accelerate to 40-60 MPH, Maintain steady speed for approx 15 mins.

Decelrate and come to a stop. Idle in gear for approx 5 mins.

Please feel free to add if there is something else I need to be checking...

I'm going to try to go thru the formal Chrysler Drive Cycle in specific order tomorrow at lunch if I can and see what happens.

Wade

chris142 · 02-07-2011, 08:39 PM

Used to they would smog it with 2 incompletes? Did the law change reciently? Went through this with our shop truck 2 years ago. It had 4 incompletes so I took it to lunch and went back. Had 2 still but it still passed.

**SuperWade2** · 02-07-2011, 08:47 PM

Quote:

Originally Posted by chris142

Used to they would smog it with 2 incompletes? Did the law change reciently? Went through this with our shop truck 2 years ago. It had 4 incompletes so I took it to lunch and went back. Had 2 still but it still passed.

Yes, the shop said it was a recent change from 2 incomplete's OK to only 1 incomplete now...not sure exactly when, and I guess I'm taking their word for it.

Wade

chris142 · 02-07-2011, 08:55 PM

Wouldn't suprize me if the rules did change. I searched on the CARB website with no luck.

http://www.arb.ca.gov/homepage.htm

**SuperWade2** · 02-07-2011, 08:58 PM

Quote:

Originally Posted by chris142

Wouldn't suprize me if the rules did change. I searched on the CARB website with no luck.

http://www.arb.ca.gov/homepage.htm

Some info here about Readiness Test/ODB and Smog testing worth adding to the thread, but not a distinction on # of incomplete tests

http://www.autorepair.ca.gov/80_BARR...bd_ii_faqs.pdf

this says 1, although not Offical DMV stuff..

http://www.smogtips.com/smog-questio...n-ready-status

tjchad · 02-08-2011, 04:16 PM

Mine hasn't passed yet either. I had an engine light (PO455) and disco'd the battery for 30 minutes. Jeep did not pass because there was no data for the test. I drove it around for about 50 miles and the light came back on. I now have 2 codes, the PO455 and a PO- I forget- it could not detect a crank reference signal or something. P1$$'g me off.

JeffBowser · 02-08-2011, 04:26 PM

Jerry's quote is spot on, but my recollection was more like 100 cycles.

silver97tj · 02-08-2011, 04:36 PM

hi all

this is why I like this forum can always learn something new and useful

Robert J. yates · 02-08-2011, 05:22 PM

The easiest way to re-set the monitors is to take it out wheeling for a day and then go get it smogged. Drive it to the trail, wheel it and drive it home. BTDT on the incompletes due to me pulling my Unichip right before a smog test.

DevilDogDoc · 02-08-2011, 05:27 PM

That's weird, my 97 I had smogged in June, I was doing something and disconnected the battery the day before oops! Went to smog the next day drove about 20 miles to get there passed just fine with a rattling cat and a 180 thermo! Passed real clean too not just barely.... Tech didn't mention any incompletes and I did tell him about the disconnect and he said hmm might cause an issue but it was fine. Maybe the rules did change recently.

**SuperWade2** · 02-08-2011, 05:43 PM

I tried to do the Drive Cycle Reset before work this AM...Living where I do, I don't have a lot of places that I can go for multiple minutes/miles at a constant throttle/speed (at least not 30-45mph). I followed these Drive Cycle things pretty much to the letter first thing and got squat (meaning 2 two monitors were still "incomplete").

Went again at lunch, tried to find another stretch of road where I could go without hills or stoplights, or whatnot to run through the Drive Cycle steps.

About 1/2 way through (15-20 minutes of driving), I finally had the EVAP monitor complete (per my Android ODB2 Reader app from about). Drove it straight to the shop where I do my smog, and it passed with flying colors.

I can't say if it was the 30-35 for 2-3 miles, or if it just finally had enough starts/stops to complete the testing. I ended up at 170 miles between battery reconnect and the EVAP monitor resetting...normally that is about 30+ days of driving for me that I did all in the last 10 or so.

The Cat monitor never reset...

inglisleslie · 08-20-2011, 08:09 PM

I am going through the same problem right now...nor inspected...trying to get inspected...had a cylinder 2 misfire.fixed.reset codes. now waiting on PCM to "have enough data". I have driven 50-60 miles and have cycled the engine from a cold start 10-15 times...any suggestions?

temporary inspection or registration? there has to be some state law to allow people to drive their car the required "50 driving cycles and 500 miles" like the Chrysler technician says in order to have the PCM learn the adaptive engine diagnostics!!!!!

Can I get a note from my shop in case i get pulled over by the bear for not having windshield stickers and a license sticker that expired June, 2010?

HELP college classes start on Monday, 400 miles away from where I live...and I need to get the smog part of my inspection done before i head up...I don't want to do the resistor fix to tricking the jeep about higher temp because that does not fix the problem of other sensors being within 11* of each other

**rusty762** · 05-15-2013, 09:38 AM

Reviving an old thread to vent, today was the fourth day I visited my local smog station.

My monitors will not run so no pass, the shop recommended I drive it for 30-40 miles before bringing it in, tried that this morning and still no joy. This is the first vehicle I have owned that has not passed a smog test the first time. When I asked for an explanation as to what I can do to get the monitors to run they are saying it is completely random and that some vehicles need to be driven 1000 miles before the monitors run? WTF! This is ridiculous, they have waved the $55 charge for each diagnostic, ****ing california and their smog laws, on top of this the codes my jeep has been throwing 0455, 0456 and 0457 I am starting to regret my purchase of a newer vehicle and am starting to miss my FJ!

**SuperWade2** · 05-15-2013, 04:05 PM

Quote:

Originally Posted by rusty762

Reviving an old thread to vent, today was the fourth day I visited my local smog station.

My monitors will not run so no pass, the shop recommended I drive it for 30-40 miles before bringing it in, tried that this morning and still no joy. This is the first vehicle I have owned that has not passed a smog test the first time. When I asked for an explanation as to what I can do to get the monitors to run they are saying it is completely random and that some vehicles need to be driven 1000 miles before the monitors run? WTF! This is ridiculous, they have waved the $55 charge for each diagnostic, ****ing california and their smog laws, on top of this the codes my jeep has been throwing 0455, 0456 and 0457 I am starting to regret my purchase of a newer vehicle and am starting to miss my FJ!

I feel your frustrations... I don't remember how many miles I finally had to drive to get it to go... I think it was several hundred (and My Jeep is normally 1000-1500 mi/year now)... My lesson was to never let the battery die or be removed any time before I need to Smog a vehicle!