can anyone explain what do these two tables do :

Idle Error - Normal
Idle Error - A/C On

thanks in advance

 

+1 on that.

 

bump for any input

 

That RPM scaling cannot be right either. It would make more sense to be multiplied by 3 or 4.

-Jamie

 

bump for answers

 

ISCV step change for a given rpm error from target idle rpm.

 

The rpm scaling cannot be right, can it?

-Jamie

 

well nobody has specified what is in their definition table, or from what ROM, so I cant say if its right or not.
But,

for an Evo7, the rpm scale should read:
rpm Steps
0____0
62___2
125__4
188__6
250__8
312__10
375__10
438__10
500__10

for an Evo8, the rpm scale should read:
rpm__ Steps
0____0
31___1
62___2
94___3
125__4
156__4
188__4
219__4
250__4

These are both JDM, but I would expect USDM to be the same.

 

That's what I have in my 88590715 map.

 

I believe mine went up to 250rpm in 9417 bit I could be mistaken. You would imagine that it would go up to actual idle RPM.

 

Doesn't need to go up to idle rpm. Unless I'm mistaken, it works sort of like the boost error correction table. If rpm is x away from desired idle rpm, then it adjusts ISC steps/demand by the relevant value.

 

Hmm, seems like this may be useful for cars that don't catch idle and almost stall during clutch-in decel. This is assuming this table is active u det those conditions.

-Jamie

 

I played around with this table trying to fix exactly what you're talking about, and it did make a difference. Increasing the adjustment too much will cause the rpm to overshoot the desired idle rpm.

 

+1 on what Raptord says, it is active, but dont go mad or the idle will start hunting