Enable DTC but disable CEL

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Topic: Enable DTC but disable CEL - 03 vs 01 ? (Read 4121 times)

elRey

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	Enable DTC but disable CEL - 03 vs 01 ? « on: May 04, 2014, 10:01:09 AM »

Hello,

I want to maintain DTC but prevent it from throw CEL/MIL.
Is it has simple as only have the first bit set and leave second bit zero in faultclass?

Specfically, I want misfires (all, even per cyl) DTCs to be enabled, but don't want them turning on CEL.

Thanks,
Rey


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ddillenger

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	Re: Enable DTC but disable CEL - 03 vs 01 ? « Reply #1 on: May 04, 2014, 10:17:56 AM »

I'm not sure you can do that. The misfires have a different routine entirely for flashing the CEL if the threshold is reached. I don't think error classing will be sufficient.


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elRey

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	Re: Enable DTC but disable CEL - 03 vs 01 ? « Reply #2 on: May 04, 2014, 11:42:10 AM »

I don't mind the flashing CEL when actively misfiring. It's the presistent CEL due to stored misfire DTCs I'm trying to address.


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ddillenger

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	Re: Enable DTC but disable CEL - 03 vs 01 ? « Reply #3 on: May 04, 2014, 12:02:28 PM »

Can I ask why you're willing to live with misfires and just hide the symptoms? Deka's at idle?


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elRey

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	Re: Enable DTC but disable CEL - 03 vs 01 ? « Reply #4 on: May 04, 2014, 02:10:05 PM »

Quote from: ddillenger on May 04, 2014, 12:02:28 PM

Can I ask why you're willing to live with misfires and just hide the symptoms? Deka's at idle?

Nail on the head. More specifically - right off idle. torque reserve handled idle, but any throttle (B_ll = false) and torque reserve is turned off. e.g. where KFMRESNL does not apply. Want to avoid a high temin to acheive 14.7

Also, dealing with a particularly bad set of 870s that vary quite a bit from one to the other.


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ddillenger

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	Re: Enable DTC but disable CEL - 03 vs 01 ? « Reply #5 on: May 04, 2014, 02:17:50 PM »

Any reason not to just modify NMIALU/MIDLU to be right above idle?

Just curious Tongue


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