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9653xxxx cold start ignition maps: need clarification

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Old Dec 30, 2009, 03:10 PM
  #16  
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Originally Posted by acamus View Post
MUT_1E is a bit array

--------------------------------------------
Bit position definitions (15-0, L-R)
--------------------------------------------
0: Coolant Temperature
1: Manifold Absolute Pressure
2: Unknown
3: Unknown
4: Is Immobilizer confirmed
5: Unknown
6: Unknown
7: Unknown
8: Unknown
9: Unknown
10: Unknown
11: Unknown
12: Unknown
13: Unknown
14: Unknown
15: Is in idle
Since MUT1E is only a byte, and we are looking at the second part of the word that makes up the total RAM address, I assume MUT1E only shows bits 0-7? Or is it bits 8-15?

Logging MUT1E for more then a quick spin around the block has been reviling.



Sub_18468 seems to be looking for bit.0 and bit.4.
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Old Dec 31, 2009, 08:37 AM
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Sorry guys....I didn't mean to start a fire. I just stated my observation.

All of your code talk is wonderful, but can you break it down to the user level for those of us that cannot follow the code? I would be more than happy to test anything out that you all find, but I need to have it broken down a bit.
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Old Dec 31, 2009, 08:57 AM
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Originally Posted by 03whitegsr View Post
Since MUT1E is only a byte, and we are looking at the second part of the word that makes up the total RAM address, I assume MUT1E only shows bits 0-7? Or is it bits 8-15?
SH2 is big-endian, so it should be bits 0-7. If you want to see the whole picture, you'll want to log the other byte as well, but only a couple of bits appeared to be in use when I did a really quick scan through 9653 for them; I'd assume more "interesting" ROMs would have a lot more going on there.
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Old Dec 31, 2009, 03:46 PM
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Originally Posted by Appauldd View Post
Sorry guys....I didn't mean to start a fire. I just stated my observation.

All of your code talk is wonderful, but can you break it down to the user level for those of us that cannot follow the code? I would be more than happy to test anything out that you all find, but I need to have it broken down a bit.
Think of it more as an open discussion to help figure out how the second sub works at his point. The talk of MUT_1E is because it is a fairly unknown RAM variable that happens to be used in both of the subs related to warmup ignition retard (and it sounds like warm up fuel enrichment as well). I was data logging it to try and get a better understanding of what it is doing.

The first sub that has the first and second tables l2r99gst posted is pretty straight forward. It's ignition and it deals with warmup retard and EGR retard. It gets added directly to the interpolated timing (if octane is not 100) from the low and high octane ignition maps.

The second sub (sub_18468) where the second group of maps l2r99gs-t posted is much more complicated. It has several different RAM addresses it looks at and writes too and would take a fair bit of time to work all the way through.

If somebody else has interest in going through sub_18468 that knows code well, I'd like to go through it as well and compare notes at the end to see if I can work it out correctly.
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Old Sep 4, 2011, 04:46 PM
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Old Sep 9, 2011, 05:34 PM
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Originally Posted by kronik5383 View Post
bump
What do you want to know?
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Old Sep 9, 2011, 07:22 PM
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is there a cold start ignition map confirmed, if yes, at what address, and is there a cold start fuel map
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Old Jul 7, 2017, 10:51 PM
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Can someone please tell me what the cold start ignition map address is for 8890015? Thanks
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