Re: does a dtc have to be set to clear codes?
[Re: IMGTX]
#3185629
10/22/23 07:26 AM
10/22/23 07:26 AM
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Joined: Dec 2014
Posts: 5,825
ohio
ruderunner
master
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master
Joined: Dec 2014
Posts: 5,825
ohio
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How can one clear codes that don't exist? Why would you try?
On the I/M stuff, you should see the various categories listed as supported or not(N/A) if listed as supported, the following information should give status as ready or not ready.
If there's no codes and everything that is supported has a status of ready, leave it alone!
Last edited by ruderunner; 10/22/23 07:33 AM.
Angry white pureblood male
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Re: does a dtc have to be set to clear codes?
[Re: Andrewh]
#3185668
10/22/23 11:01 AM
10/22/23 11:01 AM
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Joined: Jan 2003
Posts: 12,085
Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,085
Benton, IL.
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I am not clear on your goal here, but why not just take your test vehicle to one of the auto parts stores that offer the free service to double check how your scan tool is reading?
Master, again and still
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Re: does a dtc have to be set to clear codes?
[Re: Andrewh]
#3185714
10/22/23 02:15 PM
10/22/23 02:15 PM
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Joined: Apr 2003
Posts: 12,234
Looking for a way out of Middl...
IMGTX
I Live Here
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I Live Here
Joined: Apr 2003
Posts: 12,234
Looking for a way out of Middl...
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Okay I see what you are doing. If I have no DTC Codes mine will still clear them. It says Erase successful when I try to clear them. The end result is that it will clear the readiness monitors and they will flash at the top of my scanner indicating that the codes were recently erased. Your scanner needs to show the status of the readiness monitors. If they are not set, then the codes have recently been cleared. If they are all ready, and there are no codes it is PROBABLY OK. I have had codes that I could clear and they wouldn't show up for several days or weeks after the readiness monitors were set to OK. Also my scanner will check for OEM specific codes. It isn't great at that but often I can pull codes that the Manufacturer will generate but not trip and OBDII code. Mine is just a $100 to $200 Craftsman which is a re-badged Acctron. Make sure your scanner will display the Rediness Monitors and you should get what you want. Mine are at the top of the screen and display as colored circles with abbreviations like O2 or CAT in them. They change color/flash to indicate not set, set or malfunction. It's also nice to have them be able to scan while driving. I plug it in and drive, it automatically scans every minute while driving. I drive until it resets the monitors or trips a code. Beats having to drive 50 miles and hope the car is ready for emissions / inspection, Maye they all do that 
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Re: does a dtc have to be set to clear codes?
[Re: mopars4ever]
#3185733
10/22/23 04:15 PM
10/22/23 04:15 PM
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Joined: Jan 2003
Posts: 12,085
Benton, IL.
DaveRS23
Special needs idiot
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Special needs idiot
Joined: Jan 2003
Posts: 12,085
Benton, IL.
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Emissions is one of the codes that don`t erase. Pretty sure the dealer is the only one that can erase them. Aren't evap, O2, and EGR emissions related codes? We clear them regularly. And we just have a fairly basic scan tool. Torque app will clear them, too. Or are you talking about different codes? We don't have emission testing here...........at least not yet being Illinois and all.
Master, again and still
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Re: does a dtc have to be set to clear codes?
[Re: DaveRS23]
#3185788
10/22/23 08:34 PM
10/22/23 08:34 PM
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Joined: Oct 2005
Posts: 4,945
WI
Dcuda69
master
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master
Joined: Oct 2005
Posts: 4,945
WI
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The easiest way to check if codes have been cleared(which also resets monitor status) is to access Mode 6. Find a scan tool that will access all 9(or 10) Global OBD II modes. Great info available in "global" OBD including monitor status and raw sensor data. Google OBD modes 1-10
Last edited by Dcuda69; 10/22/23 08:42 PM.
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Re: does a dtc have to be set to clear codes?
[Re: IMGTX]
#3185799
10/22/23 09:20 PM
10/22/23 09:20 PM
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Joined: Dec 2014
Posts: 5,825
ohio
ruderunner
master
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master
Joined: Dec 2014
Posts: 5,825
ohio
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Okay I see what you are doing. If I have no DTC Codes mine will still clear them. It says Erase successful when I try to clear them. The end result is that it will clear the readiness monitors and they will flash at the top of my scanner indicating that the codes were recently erased. Your scanner needs to show the status of the readiness monitors. If they are not set, then the codes have recently been cleared. If they are all ready, and there are no codes it is PROBABLY OK. I have had codes that I could clear and they wouldn't show up for several days or weeks after the readiness monitors were set to OK. Also my scanner will check for OEM specific codes. It isn't great at that but often I can pull codes that the Manufacturer will generate but not trip and OBDII code. Mine is just a $100 to $200 Craftsman which is a re-badged Acctron. Make sure your scanner will display the Rediness Monitors and you should get what you want. Mine are at the top of the screen and display as colored circles with abbreviations like O2 or CAT in them. They change color/flash to indicate not set, set or malfunction. It's also nice to have them be able to scan while driving. I plug it in and drive, it automatically scans every minute while driving. I drive until it resets the monitors or trips a code. Beats having to drive 50 miles and hope the car is ready for emissions / inspection, Maye they all do that This is pretty correct. As far as testing your scanner, find a coworker who has a check engine light and plug into their car.
Angry white pureblood male
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