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Thread: OBD2 LT1 XDF $EE EEX creation

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  1. #11
    Fuel Injected!
    Join Date
    Jan 2019
    Location
    Canada
    Posts
    483
    Hi,

    Still at looking through the '97 Flash code. Are the response codes known? Look at this code segment

    Code:
    *************************************************
    * SEND MESSAGE: 
    *************************************************
    1B80  CC 80 86           LDD    #$8086        ; SUB-PARAMEATER 80 = D/L & EXECUTE
    1B83  DD 15              STD    @$15        ; 
    
    1B85  CC 18 76           LDD    #$1876        ; TSIDE MODE 36 REPLY
    1B88  DD 13              STD    @$13        ; 
    
    1B8A  C6 06              LDAB    #$06        ; MESSAGE LENGTH
    1B8C  BD 02 3E           JSR    $023E        ; SEND MESSAGE TO DLC
    
    1B8F  CE 03 FF           LDX    #$03FF        ; ZERO THE INTERNAL RAM
    1B92  6F 00              CLR    $00,X        ; 
    1B94  09                 DEX            ; 
    1B95  26 FB              BNE    $1B92        ; 
    1B97  6F 00              CLR    $00,X        ; 
    
    1B99  CE 40 00           LDX    #$4000        ; SEND BREAK SYMBOL
    1B9C  FF 10 60           STX    $1060        ; FROM DLC
    
    1B9F  20 FE              BRA    $1B9F        ; LOOP UNTIL WATCHDOG HITS
    
    
    This results in a reply of 6C F0 18 76 80 86
                                |  |  |  |  |  |
    Priority -------------------   |  |  |  |  |
    Destination tester ------------   |  |  |  |
    Source TSide ---------------------   |  |  |
    Reply to mode 36 -------------------    |  |
    Submode D/L & execute ------------------   |
    Code unknown to me ------------------------
    Do we have any info regarding the reply code? The one shown sends the message just before returning to normal operation with a watchdog reset. My guess it is a "done and happy" message.

    -Tom
    Last edited by Tom H; 05-10-2020 at 01:47 PM.

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