Misfire DTC and MAP thresholds

Knifey · **Joined:** Thu Nov 25, 2010 5:50 am **Posts:** 16

Guess I should elaborate - I have an 818s kit car using a pretty heavily altered EJ255. It has a pretty light flywheel, and there is low load on the crank due to not having power steering or A/C. I'm getting a lot of phantom misfires. ECU code is A8DK101X

I've spent a few days trying to learn how to do this sort of digging into the ECU. I got Ghidra and have been able to set ROM/RAM mapping and (I think) get some disassembly done. I followed another thread and think I located the SSMBase table, but I'm not too confident there. That's about as far as I got, I tried to follow the guide here but I don't have anything labeled or defined so I can't really get past step 1. Really in over my head here, I don't know anything about processors or programming at all.

I did try to use the defs for A8DK100I in ecuflash and it produced what looked like a "partial" table for the MAP threshold, and a table of completely random numbers for the other table.

zero knowledge · **Joined:** Thu Dec 06, 2012 7:25 pm **Posts:** 64

A8DK101X

Code:

      <table name="Misfire Count MAP Threshold" category="Misfire" address="C52F8" type="2D" level="1" scaling="Pressure (bar)">
      <table name="X" category="Misfire" address="C52C0" type="X Axis" elements="14" scaling="RPM"/>
      </table>

      <table name="Misfire DTC Threshold" category="Misfire" address="C5808" type="3D" level="1" scaling="Misfire DTC">
      <table name="Engine Load" address="C57A8" type="X Axis" elements="10" scaling="EngineLoad(g/rev)1"/>
      <table name="Engine Speed" address="C57D0" type="Y Axis" elements="14" scaling="RPM"/>
      </table>

Knifey · **Joined:** Thu Nov 25, 2010 5:50 am **Posts:** 16

Thank you, that worked!!

DYERANDSONS · **Joined:** Sat Aug 24, 2024 2:17 pm **Posts:** 34

az1g701v misfire counter addresses ecuflash can anyone specify i put 11 lbs flywheel on new motor and im right on edge at idle

td-d · **Posted:** Mon Aug 26, 2024 4:14 pm

DYERANDSONS wrote:

az1g701v misfire counter addresses ecuflash can anyone specify i put 11 lbs flywheel on new motor and im right on edge at idle

Code:

Misfire_Count_MAP_Threshold   C5C1C   
Misfire_Count_MAP_Threshold_Y_Axis   C5BE4   
Misfire_DTC_threshold   C6434   
Misfire_DTC_threshold_X_Axis   C63D4   
Misfire_DTC_threshold_Y_Axis    C63FC   

DYERANDSONS · **Joined:** Sat Aug 24, 2024 2:17 pm **Posts:** 34

YOU ROCK

DYERANDSONS · **Joined:** Sat Aug 24, 2024 2:17 pm **Posts:** 34

AE5I910V FROM 11 STI FROM FIRST POST WHAT DO I USE TO DEFINE MISFIRE COUNTER ADDRESSES FROM DATA

Guero · **Joined:** Tue Mar 18, 2014 10:23 am **Posts:** 8

I think I found them for A2ZJ710J using Win OLS5... I'm in way over my head though.

Code:

 <table name="Misfire DTC Threshold" category="Misfire" address="59e70" type="3D" level="1" scaling="Misfire DTC">
      <table name="Engine Load" address="59e08" type="X Axis" elements="12" scaling="EngineLoad(g/rev)1"/>
      <table name="Engine Speed" address="59e38" type="Y Axis" elements="14" scaling="RPM"/>
   </table>

<table name="Misfire Count MAP Threshold A" category="Misfire" address="59730" type="2D" level="1" scaling="psiabsolute">
      <table name="X" category="Misfire" address="596F8" type="X Axis" elements="14" scaling="RPM"/>
      </table>

<table name="Misfire Count MAP Threshold B" category="Misfire" address="596C0" type="2D" level="1" scaling="psiabsolute">
      <table name="X" category="Misfire" address="59688" type="X Axis" elements="14" scaling="RPM"/>
      </table>

<table name="Misfire Count MAP Threshold C" category="Misfire" address="595E0" type="2D" level="1" scaling="psiabsolute">
      <table name="X" category="Misfire" address="595A8" type="X Axis" elements="14" scaling="RPM"/>
      </table>

<table name="Misfire Count MAP Threshold D" category="Misfire" address="59650" type="2D" level="1" scaling="psiabsolute">
      <table name="X" category="Misfire" address="59618" type="X Axis" elements="14" scaling="RPM"/>

RomRaider

Misfire DTC and MAP thresholds

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