$58 F50 array

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Oct 8, 2007 | 03:33 AM

fury pilot

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Joined: May 2006

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From: England

Engine: GM 2.0XE

$58 F50 array

Anybody know what the F50 look-up array in $58 is for?

PROMgrammer calls F50 'Bias temp vs COOLTSU' (i.e. CTS at start up).

It seems to be used in closed loop code (where it is added onto whichever is the lowest of: CTS at startup and CTS), but I haven't worked through that yet (and was hoping not to have to, as I plan to always run open loop).

The standard Sunbird version of F50 is a bit weird too. I could maybe understand if the values at one end were all non-zero, and the other end all zero, but they're mixed up.

Oct 8, 2007 | 01:38 PM

RBob

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From: Chasing Electrons

Car: check

Engine: check

Transmission: check

Re: $58 F50 array

It is a strange one, no doubt about it. The turbo GrandAm also has values that vary inconsistently. Here is what I have for the table & section of code:

Code:

;-------------------------------
;                       ;
;-------------------------------
        FCB      87     ; -40
        FCB      71     ; -28
        FCB      55     ; -16
        FCB      39     ;  -4
        FCB       0     ;   8
        FCB      63     ;  20
        FCB      47     ;  32
        FCB       0     ;  44
        FCB       0     ;  56
        FCB       0     ;  68
        FCB       0     ;  80

LDC29:  BRCLR   L00C6;$01,LDC33 ; aldl mode 4 command
        BRSET   L00C7;$01,LDC5A ; aldl mode 4 command
        BRA     LDC12           ; bra to reset INT & variables

LDC33:  BRSET   L0024;$20,LDC5A ; MW2, Diagnostic Switch In ALDL Position
        LDAB    L009D           ; su coolant, N = (C + 40) * 256/192
        CMPB    L0034           ; cts, linearized, default/mat on err
        BLS     LDC3F           ;
        LDAB    L0034           ; cts, linearized, default/mat on err
                                ;
LDC3F:  ADDB    L00F4           ; Coolant Bias for SU CTS
        BCS     LDC47           ;
                                ;
        CMPB    L0034           ; cts, linearized, default/mat on err
        BLS     LDC5A           ; bra if SU/CTS+bias <= current CTS
                                ;
LDC47:  BRSET   L0030;$40,LDC5A ; MWAF1, Rich - Lean Flag (1 = Rich, 0 = Lean)
        CMPA    #128            ; cmp INT & neut
        BCS     LDC5A           ; bra if INT < 128, removing fuel
                                ;
        BRCLR   L0029;$80,LDC12 ; closed throttle flg, bra to reset INT & variab
                                ;
        LDAB    L0050           ; mph * 3.2
        CMPB    LC657           ; 1.6 mph, mph * 3.2 thres for low spd VE% tbl
        BCC     LDC12           ; bra if > 1.6 mph to reset INT & variables
                                ;
        ;
        ; test for x-cnt timeout
        ;
LDC5A:  LDAB    L0076           ; no x-cnt timer
        CMPB    L0077           ; x-cnt expected timeout
        BLS     LDC87           ;
                                ;
        BCLR    L0030;$20       ; MWAF1, First Time CIL Flag
        CLR     L0076           ; no x-cnt timer

        ;
        ; no x-cnt, move INT

RBob.