P04 Custom Code

For discussion and distribution of custom code and hacks
zack4200
Posts: 80
Joined: Sat Jun 25, 2022 1:35 am
cars: 1982 Chevy Chevette 3400 LA1 swapped
1986 Chevy Chevette
1998 Chevy s10

Re: P04 Custom Code

Post by zack4200 »

ProfessWRX
Posts: 139
Joined: Tue Oct 03, 2023 9:33 am
cars: 04 Monte SSSC
04 Tahoe
92 Trans Am
Location: AZ USA

Re: P04 Custom Code

Post by ProfessWRX »

Ok, so since nobody has posted this info anywhere that I've seen:

The extra unused PCM input for an O2 Sensor in the L67 cars is Clear 12. This corresponds with FFFFFD09 in all P04 PCMs. This is Loaded into Software register: FFFF8EC2 in 12588500. This pin can then be used for any custom work you want done with a voltage input.
ProfessWRX
Posts: 139
Joined: Tue Oct 03, 2023 9:33 am
cars: 04 Monte SSSC
04 Tahoe
92 Trans Am
Location: AZ USA

Re: P04 Custom Code

Post by ProfessWRX »

Here's a custom subroutine hooked into the Fan Coolant temp Lookup routine. This is hooked where OS check if the Fan temps are controlled by BCM. My code instead jumps to this subroutine. Checks for the performance mode and if in performance mode subtracts 40C from the Fan Turn On/Off temps and jumps back.
The second subroutine is a duplicate but is different as the Fan 2 turns ons are loaded into d4 instead of d3. I probably could have done this a cleaner way but it was easy.

Code: Select all

ROM:0006E350     ; =============== S U B R O U T I N E =======================================
ROM:0006E350
ROM:0006E350
ROM:0006E350     sDropFan1OnTemps:                       ; CODE XREF: sCoolantFan1+16Ap
ROM:0006E350 000                 tst.b   (pPerformanceMode).w ; for Performance mode
ROM:0006E354 000                 bne.s   loc_6E35A       ; Branch to 6E35A if in performance mode
ROM:0006E356 000                 move.l  a1,d3           ; Load OEM values
ROM:0006E358 000                 rts                     ; Go back to stock code
ROM:0006E35A     ; ---------------------------------------------------------------------------
ROM:0006E35A
ROM:0006E35A     loc_6E35A:                              ; CODE XREF: sDropFan1OnTemps+4j
ROM:0006E35A 000                 move.l  a1,d3           ; Pull OEM value
ROM:0006E35C 000                 move.w  #$400,d0        ; 
ROM:0006E360 000                 sub.w   d0,d3           ; Subtract 40C from value
ROM:0006E362 000                 rts                     ; Return to Stock code
ROM:0006E362     ; End of function sDropFan1OnTemps
ROM:0006E362
ROM:0006E364
ROM:0006E364     ; =============== S U B R O U T I N E =======================================
ROM:0006E364
ROM:0006E364
ROM:0006E364     sDropFan2OnTemps:                       ; CODE XREF: sCoolantFan2:loc_4C350p
ROM:0006E364 000                 tst.b   (pPerformanceMode).w ; Test an Operand
ROM:0006E368 000                 bne.s   loc_6E36E       ; Branch if Not Equal
ROM:0006E36A 000                 move.l  a1,d4           ; Move Data from Source to Destination
ROM:0006E36C 000                 rts                     ; Return from Subroutine
ROM:0006E36E     ; ---------------------------------------------------------------------------
ROM:0006E36E
ROM:0006E36E     loc_6E36E:                              ; CODE XREF: sDropFan2OnTemps+4j
ROM:0006E36E 000                 move.l  a1,d4           ; Move Data from Source to Destination
ROM:0006E370 000                 move.w  #$400,d0        ; Move Data from Source to Destination
ROM:0006E374 000                 sub.w   d0,d4           ; Subtract
ROM:0006E376 000                 rts                     ; Return from Subroutine
ROM:0006E376     ; End of function sDropFan2OnTemps
ROM:0006E376
ROM:0006E376     ; ---------------------------------------------------------------------------
Fan 1 Hook:

Code: Select all

ROM:0004C146 022                 jsr     sDropFan1OnTemps ; Jump to Custom Subroutine
ROM:0004C14C 022                 bra.s   loc_4C168       ; Branch skipping some OEM code to the correct spot.
Edit: tested, works.
Tyson
Posts: 53
Joined: Fri Nov 13, 2015 10:52 am
cars: 2000 Pontiac Grand Prix GTP, 1998 Tahoe, 2004 duramax lly, 2008 duramax and meany more I'm a mechanic/tuner

Re: P04 Custom Code

Post by Tyson »

If it wasn't answered the urban tables act as so. If your in manual 1st and run past the set urban speed then go below then try ago above again it will shift at the set urban speed. If you hit the rev limiter before the urban speed the urban speed shift will never happen. Basically it needs to see the urban speed for a 2nd time to make the shift.
Tyson
Posts: 53
Joined: Fri Nov 13, 2015 10:52 am
cars: 2000 Pontiac Grand Prix GTP, 1998 Tahoe, 2004 duramax lly, 2008 duramax and meany more I'm a mechanic/tuner

Re: P04 Custom Code

Post by Tyson »

Happy to answer any questions I can on the l67. I did alot of playing with my 2000 gtp with the tiny tuner and dhp power tuner and Tunercats. Have lots of bin file if needed as well.
kur4o
Posts: 996
Joined: Sun Apr 10, 2016 9:20 pm

Re: P04 Custom Code

Post by kur4o »

Tyson wrote: Sun Jun 23, 2024 8:05 am Happy to answer any questions I can on the l67. I did alot of playing with my 2000 gtp with the tiny tuner and dhp power tuner and Tunercats. Have lots of bin file if needed as well.
More bin files will be always welcomed.
Tyson
Posts: 53
Joined: Fri Nov 13, 2015 10:52 am
cars: 2000 Pontiac Grand Prix GTP, 1998 Tahoe, 2004 duramax lly, 2008 duramax and meany more I'm a mechanic/tuner

Re: P04 Custom Code

Post by Tyson »

here is a 2003 stock chevy Impala l36 3.8 Read from Dhp powr Tuner
Attachments
OK Tire Impala Stock File.bin
(512 KiB) Downloaded 22 times
Tyson
Posts: 53
Joined: Fri Nov 13, 2015 10:52 am
cars: 2000 Pontiac Grand Prix GTP, 1998 Tahoe, 2004 duramax lly, 2008 duramax and meany more I'm a mechanic/tuner

Re: P04 Custom Code

Post by Tyson »

2003 L36 GT Pontiac Grand Prix also a Dhptuner read
Attachments
2003 Stock GT Grand Prix.bin
(512 KiB) Downloaded 26 times
Tyson
Posts: 53
Joined: Fri Nov 13, 2015 10:52 am
cars: 2000 Pontiac Grand Prix GTP, 1998 Tahoe, 2004 duramax lly, 2008 duramax and meany more I'm a mechanic/tuner

Re: P04 Custom Code

Post by Tyson »

97 GTP L67
Attachments
97 L67 Os-16252965 Grand Prix.bin
(512 KiB) Downloaded 25 times
Tyson
Posts: 53
Joined: Fri Nov 13, 2015 10:52 am
cars: 2000 Pontiac Grand Prix GTP, 1998 Tahoe, 2004 duramax lly, 2008 duramax and meany more I'm a mechanic/tuner

Re: P04 Custom Code

Post by Tyson »

a few diffrent reads i have that all open and are usable in dhp
Attachments
2000 Buick Century LG8 3.1L - Stock - 12203659.bin
(512 KiB) Downloaded 26 times
2000 Camaro L36 12203793.bin
(512 KiB) Downloaded 20 times
2000 Bonneville L67 - Stock - 12214055.bin
(512 KiB) Downloaded 25 times
2000 Bonneville L36 - Stock - 9389670.bin
(512 KiB) Downloaded 22 times
2000 Alero LA1 - Stock - 12201467.bin
(512 KiB) Downloaded 28 times
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