EE dissection

**kur4o** · 07-12-2016

Originally Posted by jthompson122183

i was curious about the 21cd table on the tside and got the first pic as a response
i'm interested in the three bytes before each one of these tables shown in the second and third pic, there is 4 tables in this area also.
Are these the points in which the pcm can say the o2 sensor can swing back the other direction "Flyback Voltage" like the 4th picture
the first of the three bytes has something to do with tps, is this min or max tps that the pcm uses to determine when to use the next two bytes?

Attachment 10717 Attachment 10718 Attachment 10719 Attachment 10720

Tps byte is used when the timer of the table expires.
It is a min threshold to completely skip table lookup.

Table skip is set once per ignition cycle when timer expires and tps threshold is reached.

Other two bytes are used to skip table lookup when ad 02 voltage is outside of the two bytes range.

**jthompson122183** · 09-01-2016

per tc : t-side

$33A7 is the shift pressure offset vs. TPS - 2nd Gear - Performance Mode
$33B8 is the shift pressure offset vs. TPS - 3rd Gear - Performance Mode
$33C9 is the shift pressure offset vs. TPS - 4th Gear - Performance Mode

$34A6 is the upshift delay vs. TPS 1->2 shift
$34B7 is the upshift delay vs. TPS 2->3 shift
$34C8 is the upshift delay vs. TPS 3->4 shift

$3440 is the ramp 2 pressure delta vs. TPS 1->2 shift
$3451 is the ramp 2 pressure delta vs. TPS 2->3 shift
$3462 is the ramp 2 pressure delta vs. TPS 3->4 shift

$3473 is the pressure ramp 2 time vs. TPS 1->2 shift
$3484 is the pressure ramp 2 time vs. TPS 2->3 shift
$3495 is the pressure ramp 2 time vs. TPS 3->4 shift

**jthompson122183** · 09-01-2016

per tc :t-side 2224 sets the number of consecutive failures or passes required to log a passed or failed coolant system closed loop temperature diagnostic test.
t-side 2225 is the first of a group of O2 sensor response diagnostic parameters

**jthompson122183** · 09-01-2016

per tc: t-side
$33DA is the start of the 1-2, 2-3, 3-4 Pressure ramp delay time (secs) vs TPS
$340D starts the 1-2, 2-3, 3-4 Pressure delta Ramp vs TPS

**jthompson122183** · 11-01-2016

What is the equation for grams/cylinder? the location of cylinder mass air correction vs tps is at $24C3 eside. The 96-97 also has this table

Attachment 11032

**steveo** · 11-02-2016

thats an interesting correction factor, can you confirm its effect and ill add it to my xdf? looks like a good place to tune idle/decel fuel for maf cars.

**jthompson122183** · 11-04-2016

Originally Posted by steveo

thats an interesting correction factor, can you confirm its effect and ill add it to my xdf? looks like a good place to tune idle/decel fuel for maf cars.

Attachment 11035