8051 lt1 mode 4 commands

Found from a definition file with unknown author.
Some are tested and working



the format of the Mode 4 command to PCM is described below. 12 data bytes are used.
;byte 1 028a enable control
;; b0 AC Clutch
;; b1 AIR Pump
;; b2 Fan1
;; b3 Fan2
;; b4 CCPDC
;; b5 set what m001b-m0041=128
;; b6 extend IAC
;; b7 set BLM? set cell#?
;;byte 2 028b control command for 028a
;; b0 AC Clutch
;; b1 AIR Pump
;; b2 Fan1
;; b3 Fan2
;; b4 CCPDC on/off
;;byte 3 028c enable control
;; b0 007e b1 ?
;; b1 0080 b3 SkipShift?
;; b2 MIL?
;; b3 007e b2 ?
;; b4 tes_2 b3
;; b5 tes_2 b2
;;byte 4 028d control command for 028c
;;byte 5 028e enable control
;; b0 TCC Enable
;; b1 TCC Ctrl
;; b2 shift sol - Gear
;; b3 shift sol - Gear
;; b4 zero trans adapts
;; b5 BLM update
;; b6 Closed Loop
;; b7 IAC PID
;;byte 6 028f control command for 028e
;; b0 TCC Enable
;; b1 TCC Ctrl
;; b2 Gear b0
;; b3 Gear b1
;; b4 preload trans adapts
;; b5 BLM update enable/disable
;; b6 Closed Loop enable/disable
;; b7 IAC PID enable/disable
;;byte 7 0290 select PWM 1 control
;; b0 LinePressure enable
;; b1 32DSS enable
;; b2 EGRDC enable
;; b3 something enable, disable EGR override
;; b4 IAC enable
;; b5 IAC 1=RPM,0=steps
;; b6 AFR command
;; b7 Cylinder Fuel Cut enable
;;byte 8 0291 PWM 1 Command Duty Cycle (LinePress, 32DSS, EGR)
;;byte 9 0292 IAC Command
;;byte 10 0293 AFR Command, CylNumToCut
;;byte 11 0294 select PWM 2 control
;; b0 SpkControl enable
;; b1 SpkCmd 1=Ret, 0=Adv
;; b2 SpkCmd 1=Delta, 0=Absolute
;; b3 CCP enable
;;byte 12 0295 PWM 2 Command Duty Cycle (CCPDC, SpkAdv)

hex to bin 0 0 0 0 0 0 0 0
b7 b6 b5 b4 b3 b2 b1 b0

(afr x 10) to hex
(%dc x 2.55) to hex
(rpm x 0.08) to hex
(counts x 1) to hex
(spark degree x 1) to hex

SAMPLE COMMANDS

CLEAR MODE 4 EFFECT
F4 62 04 00 00 00 00 00 00 00 00 00 00 00 00

AFR 12.8
F4 62 04 00 00 00 00 00 00 40 00 00 80 00 00

wow good find! i was aware of some of those mode 4 commands, but not afr and spark? and i thought IAC could only be set RPM target

that's going to be very helpful

Here are some more sample commands and explanation.
At the end of the command is added checksum byte.


If anyone can help
I need,
commands for BLM reset,
memory write command( i guess it exist),
MODE 5 commnand - motor rehome ,for abs delphi vi modul used in f-body 93-97 and other old gm cars
it is very useful for bleeding brakes

delphi abs vi
MODE F5: MOTOR REHOME - in this mode the tech 1 commands the EBCM to rehome the motors on the hydrauic modulator/master cylinder assembly. this mode should ALWAYS be used prior to bleeding the brake system.





f4 62 04 +
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Spark retard delta
00 00 00 00 00 00 00 00 00 00 07 xx
spark retard absolute
00 00 00 00 00 00 00 00 00 00 03 xx
spark advence delta
00 00 00 00 00 00 00 00 00 00 05 xx
spark advance absolute
00 00 00 00 00 00 00 00 00 00 01 xx
xx=spark degree [ (spark degree x 1) to hex ]
__________________________________
ccp enable dc
00 00 00 00 00 00 00 00 00 00 08 xx
xx=%dc [ (%dc x 2.55) to hex ]
__________________________________
afr command
00 00 00 00 00 00 40 00 00 xx 00 00
xx=afr -> 12.0 = $78, 12.5 = $7d, 12.8 = $80, 13.0 = $82, 13.2 = $84, 13.5 = $87, 15.0 = $96, 15.5 = $9b, 16.0 = $a0, 16.5 = $a5, 17.0 = $aa
__________________________________
open loop
00 00 00 00 40 00 00 00 00 00 00 00
blm freeze update
00 00 00 00 20 00 00 00 00 00 00 00
ccp disable
10 00 00 00 00 00 00 00 00 00 00 00
open loop + disable blm update + ccp disable
10 00 00 00 60 00 00 00 00 00 00 00
open loop + disable blm update + ccp disable + afr 12.8
10 00 00 00 60 00 40 00 00 80 00 00
open loop + disable blm update + ccp disable + afr 12.8 +delta spark advance
10 00 00 00 60 00 40 00 00 80 05 xx
xx=delta spark advance [ (spark degree x 1) to hex ]
___________________________________

trans control 1st gear
00 00 00 00 0C 0C 00 00 00 00 00 00
trans control 2nd gear
00 00 00 00 0C 04 00 00 00 00 00 00
trans control 3rd gear
00 00 00 00 0C 00 00 00 00 00 00 00
trans control 4th gear
00 00 00 00 0C 08 00 00 00 00 00 00

Delta Spark Advance/Retard is added to all other spark components (base spark, warmup, knock, trac control, etc).
Absolute Spark command, will completely overrides
ALL spark components, until the mode4 command is stopped
_________________________________________

MODE 3 memory dump command
$F4,$58,$03,$xx,$xx
$xx,$xx= memory address
memory address 001c= $00,$1c
_____________________________________________
Transmission adapt learned pressure modifier values

memory (T side)
$1830 - $1840 Gear 2 Adapt Cells 0-16
$1841 - $1851 Gear 3 Adapt Cells 0-16

Automatic Transmission Adapt Learned Pressure Modifier Values
are output in mode1 message 6, along with a couple variables. To get the
adapt cell values (memory $1830 to $1840 for 2nd gear cells 0-16 & memory $1841 to $1851 for 3rd gear cells 0-16), use this memory dump command.
look in the comm window to see the request & the returned adapt values
the adapt value is the 4th byte of the Recv data.
convert to psi if needed, psi = N *.125 -16
$80 is 0 psi
$00 is -16 psi
$FF is 16


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mode 3 blm
Left BLMs $001c thru $002e
Right BLMS $002f thru $0041
$F4,$58,$03,$xx,$xx
look in the comm window to see the request & the returned values


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