disable nearly all OBD tests

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Dec 26, 2009 | 05:05 PM

#16

0xDEAD

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From: central pa

Also, off topic. Does anybody know how to disable P0622 alternator F terminal?

Dec 27, 2009 | 01:38 PM

#17

Ceddy

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From: Reading, PA

Quote:

Originally Posted by 0xDEAD

When I set myfred's bit to 0 in a USDM 2003 evo 8 ecu running the JDM ROM I evoscan can not scan my ecu for CEL codes.

Periphery2 bit 0 = 0, messes with the BaudRate/Protocol Selection Flags on some roms. Setting this back to 1 should allow CEL retrieval.

Quote:

Originally Posted by 0xDEAD

Also, off topic. Does anybody know how to disable P0622 alternator F terminal?

Don't know, but if you are going to do process of elimination, Periphery3, Bit 0 or 4, would be my best guess.

Dec 27, 2009 | 03:03 PM

#18

0xDEAD

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From: central pa

Thankyou ceddy. While I don't mind the "hack method" of shooting in the dark, having an educated starting point is always preferred.

Dec 28, 2009 | 03:25 PM

#19

fostytou

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From: Aurora, IL

Quote:

Originally Posted by mrfred

Some of these tests may only be found on Evo 9s. I think P0069 and P0090 are only on Evo 9s. I agree that there are some tests that are good to keep active. What I find interesting about the global disable is that some of the OBD CELs, such as the rear O2 heater CEL, cannot be stopped just by disabling the rear O2 heater test, so I wonder if the global disable somehow can stop the CEL for those kinds of tests.

On a follow up to the last part of my other question, does this disable routines also, or simply the test/CEL?

I'm speaking specifically of things like disabling the EGR/EVAP stuff changing the routine that changes timing at cruise or the EGR disable periphery that seems to cause cold start issues for some people, etc etc.

Dec 28, 2009 | 03:57 PM

#20

Ceddy

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From: Reading, PA

Quote:

Originally Posted by fostytou

MrFred's Global Bit, only effects Perphery2 and 3, the CEL tests.

The actual emissions equipment control routines are controlled mostly by Perphery0, and are not effected by the Global bit.

Jan 4, 2010 | 12:19 PM

#21

fostytou

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From: Aurora, IL

Quote:

Originally Posted by Ceddy

MrFred's Global Bit, only effects Perphery2 and 3, the CEL tests.

The actual emissions equipment control routines are controlled mostly by Perphery0, and are not effected by the Global bit.

Sorry if I'm dragging this out, I just want things to be clear.

I'm referring to this post (follow it back through the rabbit hole for more info)
https://www.evolutionm.net/forums/7639580-post145.html

MrFred suggested that some routines were enabled/disabled by the FCA / P2 flags.