An OBDII question for you all...

My PCM supports Mode $19 requests. Request is four bytes format like:
Code:
BANK0:CF01 *************************************************
BANK0:CF01 * MODE $19: REQUEST DTCS BY STATUS
BANK0:CF01 * REQUESTS  H0,H1,H2,$19,$XX,$FF,$00    RETURN DTCS
BANK0:CF01 *       H0,H1,H2,$19,$XX,$FF,$FF    COUNT OF DTC
BANK0:CF01 *
BANK0:CF01 * STATUS IS XX --> ANY/ALL OF THE BITS ORED TOGETHER
BANK0:CF01 * $80 - MIL ILLUMINATED
BANK0:CF01 * $40 - MIL PENDING
BANK0:CF01 * $20 - MIL PREVIOUSLY ILLUMINATED -OLD CODE
BANK0:CF01 * $10 - STORED TROUBLE CODE (FREEZE FRAMD DATA AVAILABLE)
BANK0:CF01 * $08 - GM SPECIFIC STATUS 1
BANK0:CF01 * $04 - GM SPECIFIC STATUS 0
BANK0:CF01 * $02 - CURRENT DTC CODE
BANK0:CF01 * $01 - IMMATURE DTC CODE
BANK0:CF01 *************************************************
This all looks a lot like the Mode $18 listed in SAE J2190 -> in fact so much the same I wonder if some thing changed along the way or ??

Can anyone tell me where Mode $19 is speced or any details? If you have the document, that would be icing on the cake.

Thanks,
-Tom