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Unread 02-14-2010, 03:32 PM   #1
urezki
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Retrieving OBD's codes

Hello Folk,

It's my second thread :-) Now i am confused a bit regarding obtaining
codes from the OBD2 system. According to

Jeep Grand Cherokee WK - Diagnostic Trouble Codes

documentation (see Retrieving codes (2005-2010 Grand Cherokee) section) am trying to receive them, i.e. i do following steps:

Off > On > Off > On > Off > On

and at the third "On" the odometer has to list the codes if they are, otherwise the message "Done" should appear.
The problem is that, i see nothing, i.e. no "Done" message, no error codes, i see just my mileage.

I have Jeep Grand Cherokee 2005 3.7L Laredo.

I am to obtain error codes, cause my Malfunction Indicator Lamp is light on, after engine starting.

Could you help me guys ? What am i doing wrong ?

Thank you.

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Unread 02-14-2010, 04:50 PM   #2
LTrainGC
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You have to do it rapidly. Off/On/Off/On/Off/On - on the third time to "on" it should list your codes. Make sure you are turning the key to "on" and not just "acc" too.
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Unread 02-14-2010, 05:27 PM   #3
urezki
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It looks like funny, but really nothing happens. I went through the all possible variants with different speed of switching from the "Off" to "On" position. I definitely do that rapidly and wait on the third time when it's in "On" position. I have 4 ignition key positions: OFF, ACC, ON, START.

1) Insert ignition key (OFF pos)
2) turn it to ON;
3) back to OFF;
4) again to ON;
5) back to OFF;
6) go to ON, it's final state.

btw, i do that within 5 second interval as it proposed in the manual.
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Unread 02-14-2010, 09:32 PM   #4
JMorash
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Invest in a OBD Scanner. Cheapest out there is about 30 bucks. That will give you the codes you desire.
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Unread 02-15-2010, 05:55 AM   #5
urezki
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I've already done it :-) but i thought that it's possible to obtains codes using just
ignition key, at least documentation says about that.

Thank you.
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Unread 02-19-2010, 05:41 PM   #6
urezki
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Finely i read codes, and got one P0573. Something wrong with my brake system.
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Unread 02-19-2010, 06:01 PM   #7
Texas WJ
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P0573 - Cruise Control/Brake Switch A Circuit High


Was your Jeep recently stuck in some deep snow?


I was looking around and found this code mentioned in relation to rocking the vehicle back and forth to get out of a snow bank. It's from the 300C forums, so I don't know if that's directly related to your problems though.

Link #1
Link #2
Link #3
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Unread 02-20-2010, 01:33 PM   #8
urezki
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Yes exactly, it happened immediately after moving back and forward, in order to get out of the snow bank, after that the MIL began lighting,
but i couldn't realize how it can influence on such behavior. Thank you for the links, they describe the problem exactly what i have :-)

Now i understand what i did wrong, i shifted the gear selector without well pressing the brake pedal.

Thank you.
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Unread 02-21-2010, 07:33 PM   #9
Texas WJ
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No problem. You should be able to clear the code from the computer and have no more worries about the light.
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Unread 03-06-2010, 10:08 AM   #10
urezki
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Thank you for your answers folks.

Yesterday i cleared this code, and MIL is not light now. So, now i have another problem, may be :-)
When i turn my ignition key to the ON position, the MIL it's not flashing at first, but approximately 10 sec. MIL begins to flash with one small sound, then after ~5 sec it's just light. After that i start my engine, the MIL symbol comes off.

Could you help me to understand what's going on ?
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Unread 03-06-2010, 02:07 PM   #11
Texas WJ
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Do you think you could post of the video of the problem?
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Unread 03-06-2010, 07:06 PM   #12
urezki
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Yes, i made a small video that illustrate the problem, see the link:

2shared - download mil.avi
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Unread 03-07-2010, 01:04 PM   #13
urezki
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i.e. When i turn the ignition key to the ON position, the MIL is flashing for about 10 sec, and then
return to being fully illuminated till i start the engine. When the engine is run, the MIL symbol come off, i.e. as it has to be.
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Unread 03-10-2010, 10:32 AM   #14
Texas WJ
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Sorry man, I don't know what's going on with that check engine light. I'll bump this back to the top to see if anyone else knows the answer.

Have you tried pulling the code again?
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Unread 03-10-2010, 11:23 AM   #15
urezki
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Well, i can try, but i believe there will not be any new errors, cause if they were the MIL will be light constantly while rocking.

Of course i will try, but i think it will have no results.
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