Z32 idle adjustment tables

[Torque]

Hello there,


Could someone shed some light on the Idle stabilization tables on the Z32 ECU?
On the original image (Z32) these are all ZERO.

Cheers,

Andrew
(sent from a train in Germany @ 235km/h using my phone as a modem )

[Matt]

The idle stabilization tables were around the timing routines. I believe they were to adjust the timing but don't appear to be used due to the values they contain. Eric might know the answer to this one. I never looked at the code too closely for it

[Torque]

Hi Matt,

Yes ... in the Z32 images the values are all ZERO, but on the RB25DET they are set to some values.

I don't know how the Z32 determines the idle ignition range, but maybe it just does what ever is necessary (timing wise) to keep the engine
idling neatly.


And I am curious about attached table ... why is the Y-Axis in mV?

Has it something to do with AFM?

[Matt]

Just looking this up now

R32 RB20 Sign Name/explanation The number of bytes Lattice point Unit

7940 840 TADVLN Idle stabilization control limiter 1×16 LNRPM:100rpm Deg (ADV)
7950 850 TRETLM Idle stabilization control limiter 1×16 LNRPM:100rpm Deg (RET)
7980 880 TADVPS Control of idle stabilization 1×16 △ N:200rpm Deg (ADV)
7990 890 TRETPG Control of idle stabilization 1×16 △ N:200rpm Deg (RET)

The mV only for min was a typo in the code (should be DEG BDTC... fixed that)

[Torque]

Ohh ... that makes more sense then.
Not mV, but degrees.

My problems was that the idle was somehow rough once I switched into neutral.
But once I went into a gear (without releasing the clutch) idle was just fine.

So I figured something must be wrong with the idle tables.

I also noticed that while idling ignition was between 5 BTDC and 10 ATDC.

I then changed the idle tables to allow 15 ATDC and now engine is a happy bunny at idle