[inglisleslie]

Had a misfire in cylinder 2...reset codes. Now I have driven 70 miles done about 15 drive cycles and still can't get my last 2 codes to clear. Jeep is not inspected and I need to take it to school with me on Monday. Do I really have to do 40-50 cycles over 500 miles. Any temp thing I can do in PA

[inglisleslie]

bump...for night crew not at the bars

[flatlander757]

MISFIRE MONITOR DRIVE CYCLE INSTRUCTIONS
Do not turn off the ignition switch during the test procedure.
All Onboard System Readiness codes are cleared if the battery is disconnected or when the Powertrain Control Module (PCM) is cleared with the scan tool.
This drive cycle can be used to determine if the Readiness code for this Monitor will run and complete, and if the Malfunction Indicator Lamp (MIL) will remain off after the vehicle is driven.
Operating Ranges: Whenever a range of values is provided, try to operate the vehicle in the middle of the range. For example, if the vehicle speed range is from 45-65 MPH, operate the vehicle at as close as possible to 55 mph. If the Short Term fuel trim range is -20% to +20%; try to operate the vehicle near 0%.
Scan Tool Data: There are certain Parameter Identification (PID) values that must be within range before this Monitor will "run". It can be helpful to pull up these PID items on the scan tool so an assistant can view them during the test.
This information is a representation of a Drive Cycle, and may vary due to software revisions to the PCM.
The Readiness code for this Monitor defaults to "continuous" or "monitoring" because this Monitor runs continuously whenever the engine is running.

MISFIRE MONITOR PRETEST CONDITIONS
MIL is off.
No Emission related DTC's are present.
Ambient battery temperature more than 20ºF
BARO signal more than 22" Hg (altitude less than 8,000 feet )
ECT signal within 20ºF of the BTS signal
Fuel level more than 15%.
Adaptive Numerator Learned = YES
Average RPM Error Too Large = NO
REV'S to Learn Adaptive Numerator = XX
200 REV Counter Counting (OK)
Misfire Disabled = 0 (0=OK)
LO ADAP Numerator Cylinder 2&3 (IC9C) = 1C9C
LO ADAP Numerator Cylinder 2&3 (3800) = 3800
HI ADAP Numerator Cylinder 2&3 (3938) = 3938
HI ADAP Numerator Cylinder 2&3 (7000) = 7000
Average RPM Error Cylinder 2&3 = 0
LO ADAP Numerator Cylinder 4&7 (IC9C) = 1C9C
LO ADAP Numerator Cylinder 4&7 (3800) = 3800
HI ADAP Numerator Cylinder 4&7 (3938) = 3938
HI ADAP Numerator Cylinder 4&7 (7000) = 7000
Average RPM Error Cylinder 4&7 = 0
LO ADAP Numerator Cylinder 5&8 (IC9C) = 1C9C
LO ADAP Numerator Cylinder 5&8 (3800) = 3800
HI ADAP Numerator Cylinder 5&8 (3938) = 3938
HI ADAP Numerator Cylinder 5&8 (7000) = 7000
Average RPM Error Cylinder 5&8 = 0

MISFIRE MONITOR ENABLING CONDITIONS
200 REV Counter Counting (OK)
Average RPM Error Too Large = NO
Engine RPM = Actual Engine Speed
REV Counter = OK (counting)
Misfire Counter Catalyst 200 REV = 0
Misfire Counter Catalyst 600 REV = 0
Misfire Counter Catalyst 1000 REV = 0
Misfire Counter Catalyst 4000 REV = 0
Misfire Disabled = 0 (0=OK)
Misfire Monitor Data = 00
Misfire Monitor Fail This Trip = NO

Look at the conditions required and make sure you meet them all.

[flatlander757]

Originally Posted by inglisleslie

Had a misfire in cylinder 2...reset codes. Now I have driven 70 miles done about 15 drive cycles and still can't get my last 2 codes to clear. Jeep is not inspected and I need to take it to school with me on Monday. Do I really have to do 40-50 cycles over 500 miles. Any temp thing I can do in PA

What codes are you claiming aren't clearing? Disconnect the battery negative lead, touch it to the positive terminal(to discharge all diodes in the system) and reconnect it.

There should be no codes after that.

If there are, then they're still active and you still have something wrong.

AFTER the codes are cleared and gone, then you can do the drive cycles.

Note that there are about 8 drive cycles that need completed, some need completed before others will even start... which is why it will take generally a hundred+ miles to make it ready for smog testing.

[inglisleslie]

Originally Posted by flatlander757

What codes are you claiming aren't clearing? Disconnect the battery negative lead, touch it to the positive terminal(to discharge all diodes in the system) and reconnect it.

There should be no codes after that.

If there are, then they're still active and you still have something wrong.

AFTER the codes are cleared and gone, then you can do the drive cycles.

Note that there are about 8 drive cycles that need completed, some need completed before others will even start... which is why it will take generally a hundred+ miles to make it ready for smog testing.

thanks for the tips. i actually dont have an OBD II scanner...my shop does and he said he had the engine cylinder 2 missfire code due to a spark plug gap being off...he fixed it and said he reset the PCM. he did not give me the PXXX code and i didnt confirm that he held the batt + to - terminal for a minute. He just told me to drive it around all weekend and hopefully it would relearn the adaptive engine diagnostics(but i have been reading it takes up to 40-50 drive cycles). Again, im not throwing any codes anymore...just in the relearning drive cycle process of my ?PCM?

Question:
Can a drive cycle only begin with a cold start? i dont think so because it takes up to 8 hrs for a cold start?....im just waiting like 2-3 hrs before my drive cycles

[Jonny Jeep]

The 50 drive cycles over 500 miles is only if the adaptive memory has been reset. If you don't have any current codes don't worry about it. Here's more on the adaptive memory reset, check post 11 in this thread...

http://www.jeepbbs.net/forums/showthread.php?t=6779

[Rammer500]

You said the codes were reset and the check engine light is on. You must have an active code then. Either it reappeared, or you have a new one.

[flatlander757]

Originally Posted by inglisleslie

thanks for the tips. i actually dont have an OBD II scanner...my shop does and he said he had the engine cylinder 2 missfire code due to a spark plug gap being off...he fixed it and said he reset the PCM. he did not give me the PXXX code and i didnt confirm that he held the batt + to - terminal for a minute. He just told me to drive it around all weekend and hopefully it would relearn the adaptive engine diagnostics(but i have been reading it takes up to 40-50 drive cycles). Again, im not throwing any codes anymore...just in the relearning drive cycle process of my ?PCM?

Question:
Can a drive cycle only begin with a cold start? i dont think so because it takes up to 8 hrs for a cold start?....im just waiting like 2-3 hrs before my drive cycles

For the O2 sensor drive cycle, it has to be sitting for 8hrs before a restart. For the EVAP drive cycle, it takes 10hrs before a restart for the drive cycle to be in the clear to run.

And while the information I'm looking at doesn't say so... I'm fairly confident that for the misfire drive cycle to start, the O2, catalyst, and EVAP drive cycles need to be completed first. I had some vehicle a few weeks ago that had a misfire and I had to hit all the drive cycles over the course of 2 days.

It's not so much that it takes 400-500 miles to drive it... it's that it probably takes that long with peoples' normal driving habits before they hit all the parameters in the drive cycles in order.



For pulling codes, cycle your key on-off-on-off-on and the dash will tell you the codes. It will read off whatever it has, then say DONE when it's finished... if there are no codes will will go straight to DONE.

[flatlander757]

Here are all the drive cycle requirements:

CATALYST MONITOR DRIVE CYCLE INSTRUCTIONS
Do not turn off the ignition switch during the test procedure.
All Onboard System Readiness codes are cleared if the battery is disconnected or when the Powertrain Control Module (PCM) is cleared with the scan tool.
This drive cycle can be used to determine if the Readiness code for this Monitor will run and complete, and if the Malfunction Indicator Lamp (MIL) will remain off after the vehicle is driven.
Operating Ranges: Whenever a range of values is provided, try to operate the vehicle in the middle of the range. For example, if the vehicle speed range is from 45-65 MPH, operate the vehicle at as close as possible to 55 mph. If the Short Term fuel trim range is -20% to +20%; try to operate the vehicle near 0%.
Scan Tool Data: There are certain Parameter Identification (PID) values that must be within range before this Monitor will "run". It can be helpful to pull up those PID items on the scan tool so an assistant can view them during the test.
This information is a representation of a Drive Cycle, and may vary due to software revisions to the PCM.

CATALYST MONITOR PRETEST CONDITIONS
MIL is off.
No emission related diagnostic trouble codes (DTC's) are present.
BTS signal range from 21-130ºF.
Catalyst temperature range from 0-2,040ºF.
ECT signal from 147-260ºF.
Open Throttle Time from 3.0-13.9 minutes.
VSS Range from 45-100 mph.
VSS MPH Time between 1 and 100 minutes.

CATALYST MONITOR ENABLING CONDITIONS
Catalyst temperature range from 0-2,040ºF.
Engine speed range from 1, 344-2,048 RPM.
Exhaust time from 3.0-13.9 minutes.
MAP signal from 12-30" Hg.
Minimum Test Time from 0.3-13.9 minutes.
VSS range from 50-65 MPH.

MISFIRE MONITOR DRIVE CYCLE INSTRUCTIONS
Do not turn off the ignition switch during the test procedure.
All Onboard System Readiness codes are cleared if the battery is disconnected or when the Powertrain Control Module (PCM) is cleared with the scan tool.
This drive cycle can be used to determine if the Readiness code for this Monitor will run and complete, and if the Malfunction Indicator Lamp (MIL) will remain off after the vehicle is driven.
Operating Ranges: Whenever a range of values is provided, try to operate the vehicle in the middle of the range. For example, if the vehicle speed range is from 45-65 MPH, operate the vehicle at as close as possible to 55 mph. If the Short Term fuel trim range is -20% to +20%; try to operate the vehicle near 0%.
Scan Tool Data: There are certain Parameter Identification (PID) values that must be within range before this Monitor will "run". It can be helpful to pull up these PID items on the scan tool so an assistant can view them during the test.
This information is a representation of a Drive Cycle, and may vary due to software revisions to the PCM.
The Readiness code for this Monitor defaults to "continuous" or "monitoring" because this Monitor runs continuously whenever the engine is running.

MISFIRE MONITOR PRETEST CONDITIONS
MIL is off.
No Emission related DTC's are present.
Ambient battery temperature more than 20ºF
BARO signal more than 22" Hg (altitude less than 8,000 feet )
ECT signal within 20ºF of the BTS signal
Fuel level more than 15%.
Adaptive Numerator Learned = YES
Average RPM Error Too Large = NO
REV'S to Learn Adaptive Numerator = XX
200 REV Counter Counting (OK)
Misfire Disabled = 0 (0=OK)
LO ADAP Numerator Cylinder 2&3 (IC9C) = 1C9C
LO ADAP Numerator Cylinder 2&3 (3800) = 3800
HI ADAP Numerator Cylinder 2&3 (3938) = 3938
HI ADAP Numerator Cylinder 2&3 (7000) = 7000
Average RPM Error Cylinder 2&3 = 0
LO ADAP Numerator Cylinder 4&7 (IC9C) = 1C9C
LO ADAP Numerator Cylinder 4&7 (3800) = 3800
HI ADAP Numerator Cylinder 4&7 (3938) = 3938
HI ADAP Numerator Cylinder 4&7 (7000) = 7000
Average RPM Error Cylinder 4&7 = 0
LO ADAP Numerator Cylinder 5&8 (IC9C) = 1C9C
LO ADAP Numerator Cylinder 5&8 (3800) = 3800
HI ADAP Numerator Cylinder 5&8 (3938) = 3938
HI ADAP Numerator Cylinder 5&8 (7000) = 7000
Average RPM Error Cylinder 5&8 = 0

MISFIRE MONITOR ENABLING CONDITIONS
200 REV Counter Counting (OK)
Average RPM Error Too Large = NO
Engine RPM = Actual Engine Speed
REV Counter = OK (counting)
Misfire Counter Catalyst 200 REV = 0
Misfire Counter Catalyst 600 REV = 0
Misfire Counter Catalyst 1000 REV = 0
Misfire Counter Catalyst 4000 REV = 0
Misfire Disabled = 0 (0=OK)
Misfire Monitor Data = 00
Misfire Monitor Fail This Trip = NO

DOWNSTREAM HO2S MONITOR DRIVE CYCLE INSTRUCTIONS
Do not turn off the ignition switch during the test procedure.
All Onboard System Readiness codes are cleared if the battery is disconnected or when the Powertrain Control Module (PCM) is cleared with the scan tool.
This drive cycle can be used to determine if the Readiness code for this Monitor will run and complete, and if the Malfunction Indicator Lamp (MIL) will remain off after the vehicle is driven.
Operating Ranges: Whenever a range of values is provided, try to operate the vehicle in the middle of the range. For example, if the vehicle speed range is from 45-65 MPH, operate the vehicle at as close as possible to 55 mph. If the Short Term fuel trim range is -20% to +20%; try to operate the vehicle near 0%.
Scan Tool Data: There are certain Parameter Identification (PID) values that must be within range before this Monitor will "run". It can be helpful to pull up those PID items on the scan tool so an assistant can view them during the test.
This information is a representation of a Drive Cycle, and may vary due to software revisions to the PCM.

DOWNSTREAM HO2S MONITOR PRETEST CONDITIONS
MIL is off.
No emission related diagnostic trouble codes (DTC's) are present.
MAX Delay Time from 0.0-5.8 minutes.

DOWNSTREAM HO2S MONITOR ENABLING CONDITIONS
Engine speed range from 1,344-2,400 RPM.
MAP range from 11.8-30" Hg.
VSS range between 50-65 MPH.

UPSTREAM HO2S MONITOR DRIVE CYCLE INSTRUCTIONS
Do not turn off the ignition switch during the test procedure.
All Onboard System Readiness codes are cleared if the battery is disconnected or when the Powertrain Control Module (PCM) is cleared with the scan tool.
This drive cycle can be used to determine if the Readiness code for this Monitor will run and complete, and if the Malfunction Indicator Lamp (MIL) will remain off after the vehicle is driven.
Operating Ranges: Whenever a range of values is provided, try to operate the vehicle in the middle of the range. For example, if the vehicle speed range is from 45-65 MPH, operate the vehicle at as close as possible to 55 mph. If the Short Term fuel trim range is -20% to +20%; try to operate the vehicle near 0%.
Scan Tool Data: There are certain Parameter Identification (PID) values that must be within range before this Monitor will "run". It can be helpful to pull up those PID items on the scan tool so an assistant can view them during the test.
This information is a representation of a Drive Cycle, and may vary due to software revisions to the PCM.

UPSTREAM HO2S MONITOR PRETEST CONDITIONS
MIL is off.
No emission related diagnostic trouble codes (DTC's) are present.
BTS signal between 21-130ºF.
ECT signal from 147-260ºF.
Open Throttle Time from 1.0-13.9 minutes.
VSS signal between 10-100 MPH.

UPSTREAM HO2S MONITOR ENABLING CONDITIONS
Adaptive Cell ID number between 0.0 and 20.0.
Exhaust Time from 1.1-13.9 minutes.
Engine speed range between 448-992 RPM.
Maximum Test Time between 0-1.6 minutes.
VSS range between 0-5 MPH.

FUEL SYSTEM MONITOR DRIVE CYCLE INSTRUCTIONS
Do not turn off the ignition switch during the test procedure.
All Onboard System Readiness codes are cleared if the battery is disconnected or when the Powertrain Control Module (PCM) is cleared with the scan tool.
This drive cycle can be used to determine if the Readiness code for this Monitor will run and complete, and if the Malfunction Indicator Lamp (MIL) will remain off after the vehicle is driven.
Operating Ranges: Whenever a range of values is provided, try to operate the vehicle in the middle of the range. For example, if the vehicle speed range is from 45-65 MPH, operate the vehicle at as close as possible to 55 mph. If the Short Term fuel trim range is -20% to +20%; try to operate the vehicle near 0%.
Scan Tool Data: There are certain Parameter Identification (PID) values that must be within range before this Monitor will "run". It can be helpful to pull up those PID items on the scan tool so an assistant can view them during the test.
This information is a representation of a Drive Cycle, and may vary due to software revisions to the PCM.
The Readiness code for this Monitor defaults to "continuous" or "monitoring" because this Monitor runs continuously when the engine runs in Closed Loop.

FUEL SYSTEM MONITOR PRETEST CONDITIONS
MIL is off.
No emission related diagnostic trouble codes (DTC's) are present.
BTS signal between 21ºF and 130ºF.

FUEL SYSTEM MONITOR ENABLING CONDITIONS
MAP signal from 7-30" Hg

COMPONENT MONITOR DRIVE CYCLE INSTRUCTIONS
Do not turn off the ignition switch during the test procedure.
All Onboard System Readiness codes are cleared if the battery is disconnected or when the Powertrain Control Module (PCM) is cleared with the scan tool.
This drive cycle can be used to determine if the Readiness code for this Monitor will run and complete, and if the Malfunction Indicator Lamp (MIL) will remain off after the vehicle is driven.
Operating Ranges: Whenever a range of values is provided, try to operate the vehicle in the middle of the range. For example, if the vehicle speed range is from 45-65 MPH, operate the vehicle at as close as possible to 55 mph. If the Short Term fuel trim range is -20% to +20%; try to operate the vehicle near 0%.
Scan Tool Data: There are certain Parameter Identification (PID) values that must be within range before this Monitor will "run". It can be helpful to pull up those PID items on the scan tool so an assistant can view them during the test.
The Readiness code for this Monitor defaults to "continuous" or "monitoring" because this Monitor runs continuously when the engine is cranking or running.
This information is a representation of a Drive Cycle, and may vary due to software revisions to the PCM.

COMPONENT MONITOR PRETEST CONDITIONS
MIL is off.
Battery voltage between 11-16v.
Key on or engine running at idle or cruise speed.

HO2S HEATER MONITOR DRIVE CYCLE INSTRUCTIONS
Do not turn off the ignition switch during the test procedure.
All Onboard System Readiness codes are cleared if the battery is disconnected or when the Powertrain Control Module (PCM) is cleared with the scan tool.
This drive cycle can be used to determine if the Readiness code for this Monitor will run and complete, and if the Malfunction Indicator Lamp (MIL) will remain off after the vehicle is driven.
Operating Ranges: Whenever a range of values is provided, try to operate the vehicle in the middle of the range. For example, if the vehicle speed range is from 45-65 MPH, operate the vehicle at as close as possible to 55 mph. If the Short Term fuel trim range is -20% to +20%; try to operate the vehicle near 0%.
Scan Tool Data: There are certain Parameter Identification (PID) values that must be within range before this Monitor will "run". It can be helpful to pull up those PID items on the scan tool so an assistant can view them during the test.
This information is a representation of a Drive Cycle, and may vary due to software revisions to the PCM.

HO2S HEATER MONITOR PRETEST CONDITIONS
Engine cool-down period completed (requires a key-off period of 8 hours).
MIL is off.
No emission related diagnostic trouble codes (DTC's) are present.
ECT signal between -50ºF and 104ºF at startup.
ECT and BTS signals within 14.4ºF (8ºC) of the each other at startup.
HO2S-12 (Bank 1 Sensor 2) signal between 4.0-5.0v.
HO2S-22 (Bank 2 Sensor 2) signal between 4.0-5.0v.

HO2S HEATER MONITOR ENABLING CONDITIONS
Battery voltage from 10.5-15.0v.

EVAP LDP MONITOR DRIVE CYCLE INSTRUCTIONS
Do not turn off the ignition switch during the test procedure.
All Onboard System Readiness codes are cleared if the battery is disconnected or when the Powertrain Control Module (PCM) is cleared with the scan tool.
This drive cycle can be used to determine if the Readiness code for this Monitor will run and complete, and if the Malfunction Indicator Lamp (MIL) will remain off after the vehicle is driven.
Operating Ranges: Whenever a range of values is provided, try to operate the vehicle in the middle of the range. For example, if the vehicle speed range is from 45-65 MPH, operate the vehicle at as close as possible to 55 mph. If the Short Term fuel trim range is -20% to +20%; try to operate the vehicle near 0%.
Scan Tool Data: There are certain Parameter Identification (PID) values that must be within range before this Monitor will "run". It can be helpful to pull up those PID items on the scan tool so an assistant can view them during the test.
This information is a representation of a Drive Cycle, and may vary due to software revisions to the PCM.

EVAP LEAK DETECTION PUMP (LDP) MONITOR PRETEST CONDITIONS
Cold engine startup (requires a key-off period of 8-10 hours).
MIL is off.
No emission related diagnostic trouble codes (DTC's) are present.
Ambient temperature between 40-90ºF at startup. OVER 90 DEGREES? FORGET ABOUT IT.
BARO signal range from 22.1-31.0" Hg.
BTS signal range between 21-130ºF at startup.
ECT signal within 18ºF of the BTS signal at startup.
Fuel level between 15-85%. FULL TANK? WON'T RUN THE MONITOR

EVAP LEAK DETECTION PUMP (LDP) MONITOR ENABLING CONDITIONS
Battery voltage range from 10.5-15.5v.
Vacuum range from 4.9-31.0" Hg.
Vehicle speed from 0-10 MPH.

You have to hit all the drive cycles, and I THINK in some specific order because some depend on others to have passed before starting.

The only one that you can "force" is the EVAP system... you need a DRB3 scan tool to run an "Evap forced monitor" test to check for EVAP leaks.

Hopefully now you can see why some say it takes 400-500 miles to run all the tests.

edit: I bolded a few of the things that may be controllable/possible issues. I didn't bold the same thing on every monitor, but a lot of them are required for multiple drive cycle monitors... such as the battery temp sensor and coolant temp sensor. The only way they'll be close to each other in temp is when the Jeep has been sitting overnight and the coolant temp is near ambient temp, which the battery will be too.

[inglisleslie]

WOW thank you...but wow what a PITA!!! i just got my registration sticker for my license plate today so the only thing im missing is the inspection and emissions stickers on my front windshield...which isnt nearly as bad as not having the car properly registered...I have to drive a few hundred miles to state college tomorrow so maybe they will clear then!

[Knuckelhead]

Originally Posted by flatlander757

For pulling codes, cycle your key on-off-on-off-on and the dash will tell you the codes. It will read off whatever it has, then say DONE when it's finished... if there are no codes will will go straight to DONE.

That won't work on his 2000 TJ...

[flatlander757]

Originally Posted by Knuckelhead

That won't work on his 2000 TJ...

That's weird... I know the 97s will at least flash the CEL on and off to correspond to a 2 digit code... freaking Chrysler and their "in between years"

[inglisleslie]

Originally Posted by flatlander757

That's weird... I know the 97s will at least flash the CEL on and off to correspond to a 2 digit code... freaking Chrysler and their "in between years"

I can hold the odometer button while I turn the key 2 clicks(not starting) and then let go. My odometer counts from all 1 to all 9 as the gauges do a test cycle...then no code flashes...it just goes straght to showing my miles traveled.

Again I don't have any codes, just in the PCM relearning process with drive cycles

[flatlander757]

Originally Posted by inglisleslie

I can hold the odometer button while I turn the key 2 clicks(not starting) and then let go. My odometer counts from all 1 to all 9 as the gauges do a test cycle...then no code flashes...it just goes straght to showing my miles traveled.

Again I don't have any codes, just in the PCM relearning process with drive cycles

You should be able to go to a parts store that does free scanning with one of the cheapie scanners. Go through the menu, first scan for codes and make sure none are present... if anything then maybe P1000 will be(drive cycles not yet completed).

Then see if you can find something in the menu about drive cycle monitors... it should tell you which ones are ready/OK and which ones have not passed yet. Once you figure that out you can hopefully change your driving habits to make it hit the drive cycles needed to be in the clear.

edit: This will work on the cheapie scanner that Advance Auto Parts loans out. The one I went to makes you give them your license as collateral, then you go out and scan for codes or whatever. Give it back and get your license back.

[inglisleslie]

all fixed it was a bad speed sensor in the jb ss sye kit. got it replaced and everything works fine...finally, 6 months later my CEL light is no more