Check Engine Light Reset - Page 2 - JeepForum.com

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post #16 of 30 Old 03-27-2012, 11:37 PM
Knuckelhead
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Quote:
Originally Posted by jeepinjeffrey View Post
Yes you can have the coed show up in the little odometer screen and use that chart to decode the codes.

For a 1998 - Present TJ
in 1998, Chrysler upgraded the Jeep's internals to include their revised system used across many Chrysler fuel-injection models. This newer system still provides for reading the codes yourself. But how you do it and actual codes themselves are different from the 1997 and earlier models.

The method you use to view the engine diagnostics is now different. Starting in 1998, the method of repeatedly switching on/off of the ignition is now used for programming the new Chrysler Sentry Key system. The Sentry Key was introduced in 1998 as an optional feature and by 2000 was standard on all TJs. Some 1998 models without the Sentry Key system may still use the older procedure. The way to tell if your Jeep has the Sentry Key system is if the plastic head on your keys are gray--you do. Black headed keys mean you don't have the Sentry Key system.

So on TJs with the newer diagnostic system, to see the codes you put the key into the ignition, push and hold down the odometer reset button, turn the key to RUN, then release the odometer reset button. When you do this you are rewarded with dancing number displays, the firmware version number, any error codes, then a diagnostic test of all the dash indicators and gauges. The gauges will, one by one, go through a calibration--the needles moving and stopping at major increments so you can check their alignment with the dial markings.

Output from the newer onboard diagnostics is easier to read now, as you get full 4-digits codes for much greater detail.
I can not read any codes on my odometer in my 2000 Sport. I have to use a code reader.

My 2000 also doesn't have the Sentry system.

If you hold down the odometer reset button and turn the key on, all it does is an instrument cluster test, no OBD II display.

Where do you come up with this stuff?...

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post #17 of 30 Old 03-27-2012, 11:39 PM
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Quote:
Originally Posted by jeepinjeffrey View Post
or try this
put key in ignition
turn key "on"
turn key "off"

turn key "on"
turn key "off"

turn key "on"
turn key "off"

Code displays on odometer
If you follow that sequence, nothing will be displayed on any TJ odometer...
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post #18 of 30 Old 03-28-2012, 08:25 AM
GM92
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Quote:
Originally Posted by jeepinjeffrey View Post
or try this
put key in ignition
turn key "on"
turn key "off"

turn key "on"
turn key "off"

turn key "on"
turn key "off"

Code displays on odometer
Well he was close, 3rd time leave key on until code(s) or "done" is displayed in odometer. May not work on '00 - '02 models due to PCM differences.

From the FSM: After three good trips the MIL is extinguished and the Task Manager automatically switches the trip counter to a warm-up cycle ounter. DTCs are automatically erased following 40 warm-up cycles if the component does not fail again.

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post #19 of 30 Old 03-28-2012, 08:32 AM
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wow. okay this saves me a trip to Autozone to have them read. as always, thanks fellers
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post #20 of 30 Old 03-28-2012, 08:32 AM
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Quote:
Only hard codes will come back on after you pull the battery ...soft codes will be wiped clean
What is the diff? I had a MAP sensor code come up. It was cleared and never came back. I have been wondering if it is still there.
Quote:
I can not read any codes on my odometer in my 2000 Sport.
same here.... atleast not with the on/off method
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post #21 of 30 Old 03-28-2012, 08:44 AM
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Quote:
Originally Posted by GM92 View Post
Well he was close, 3rd time leave key on until code(s) or "done" is displayed in odometer. May not work on '00 - '02 models due to PCM differences.

From the FSM: After three good trips the MIL is extinguished and the Task Manager automatically switches the trip counter to a warm-up cycle ounter. DTCs are automatically erased following 40 warm-up cycles if the component does not fail again.
It will work for the 2002, one thing i didn't see mentioned is don't turn the key to crank ...just to the "accessory on" position
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post #22 of 30 Old 03-28-2012, 10:54 PM
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Quote:
Originally Posted by Knuckelhead View Post

Where do you come up with this stuff?...
I googled it and got if from a website sorry.

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post #23 of 30 Old 03-28-2012, 11:23 PM
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Quote:
Originally Posted by jeepinjeffrey View Post
I googled it and got if from a website sorry.
Well, it would help if you'd stop posting things as fact when you don't know if they are...
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post #24 of 30 Old 09-15-2012, 04:58 PM
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It's not your gas cap. It's a $12.00 gasket that's located between the muffler and the polution devise. Call your dealer, they'll know what it's called and tell you it's location. Very easy fix. Had the same problem.
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post #25 of 30 Old 06-06-2013, 07:04 PM
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Bringing this thread back from the dead.

My check engine light came on yesterday. A few days ago the engine would bog down and then come back to life while I heard a loud clanking sound under the Jeep. This happened a few times then stopped. Then yesterday the Check Engine light came on and has stayed on, but it has not bogged down since.

Quote:
Originally Posted by jeepinjeffrey View Post
Yes you can have the coed show up in the little odometer screen and use that chart to decode the codes.

For a 1998 - Present TJ
in 1998, Chrysler upgraded the Jeep's internals to include their revised system used across many Chrysler fuel-injection models. This newer system still provides for reading the codes yourself. But how you do it and actual codes themselves are different from the 1997 and earlier models.

The method you use to view the engine diagnostics is now different. Starting in 1998, the method of repeatedly switching on/off of the ignition is now used for programming the new Chrysler Sentry Key system. The Sentry Key was introduced in 1998 as an optional feature and by 2000 was standard on all TJs. Some 1998 models without the Sentry Key system may still use the older procedure. The way to tell if your Jeep has the Sentry Key system is if the plastic head on your keys are gray--you do. Black headed keys mean you don't have the Sentry Key system.

So on TJs with the newer diagnostic system, to see the codes you put the key into the ignition, push and hold down the odometer reset button, turn the key to RUN, then release the odometer reset button. When you do this you are rewarded with dancing number displays, the firmware version number, any error codes, then a diagnostic test of all the dash indicators and gauges. The gauges will, one by one, go through a calibration--the needles moving and stopping at major increments so you can check their alignment with the dial markings.

Output from the newer onboard diagnostics is easier to read now, as you get full 4-digits codes for much greater detail.
Quote:
Originally Posted by Knuckelhead View Post
If you follow that sequence, nothing will be displayed on any TJ odometer...
I tried it.. nothing happened.

Quote:
Originally Posted by jeepinjeffrey View Post
or try this
put key in ignition
turn key "on"
turn key "off"

turn key "on"
turn key "off"

turn key "on"
turn key "off"

Code displays on odometer
This worked.. sort of. It went through all the gauge readings, but did not show an error code. All it showed was my odometer reading.

I don't want to go to the auto parts store and have them check it, because I don't want them selling me useless items to "fix" it, such as blinker fluid.

Any more suggestions?

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post #26 of 30 Old 06-06-2013, 10:05 PM
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Quote:
Originally Posted by ScruffMcGruff View Post
I tried it.. nothing happened.
You need a code reader for your 1998...
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post #27 of 30 Old 06-07-2013, 06:33 AM
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Quote:
Originally Posted by Knuckelhead View Post
If you follow that sequence, nothing will be displayed on any TJ odometer...
works on my tj odometer..Maybe I don't have a TJ

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post #28 of 30 Old 06-07-2013, 06:52 AM
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Quote:
You need a code reader for your 1998...
Do you have any recommendations for a code reader? I have been wanting to buy a good one.
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post #29 of 30 Old 06-07-2013, 03:20 PM
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Quote:
Originally Posted by TJJeepJosh View Post
works on my tj odometer..Maybe I don't have a TJ
If your key is in the off position, nothing will be displayed in the odometer display...
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post #30 of 30 Old 06-07-2013, 03:21 PM
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Quote:
Originally Posted by purplepig View Post
Do you have any recommendations for a code reader? I have been wanting to buy a good one.
I bought a cheap one from HF, maybe someone else can make a recommendation?...
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