As for trouble codes, I wasn't throwing any that I can remember.
The OP has trouble codes.
Yes. The listing of each code the ecm can test and record so the tuner can turn it off or on. Here's a trouble code mask from $42:
Code:
LD4FB FDB $00E0 ; 11. ERROR flag 1
;
; b7 ERROR CODE 12 NO DRP
; b6 ERROR CODE 13 OXYGEN SENSOR
; b5 ERROR CODE 13 OXYGEN SENSOR
: b4 ERROR CODE 15 COOLANT SENSOR LOW
;
; b3 ERROR CODE 21 TPS HIGH
; b2 ERROR CODE 22 TPS LOW
; b1 ERROR CODE 22 TPS LOW
: b0 ERROR CODE 24 Vss
;----------------------------
LD4FD FDB $00E1 ; 12. ERROR flag 2
;
; b7 ERROR CODE 25 not used
; b6 ERROR CODE 31 GOVERNOR FAIL
; b5 ERROR CODE 32 EGR FAILURE
: b4 ERROR CODE 33 MAP SENSOR HIGH
;
; b3 ERROR CODE 34 MAP SENSOR LOW
; b2 ERROR CODE 35 not used
; b1 ERROR CODE 41 not used
: b0 ERROR CODE 42 EST MONITOR ERROR
;----------------------------
LD4FF FDB $00E2 ; 13. ERROR flg 3
;
; b7 ERROR CODE 43 KNOCK SPARK CONTROL FAILURE
; b6 ERROR CODE 44 o2 LEAN
; b5 ERROR CODE 45 o2 RICH
: b4 ERROR CODE 51 PROM ERROR
;
; b3 ERROR CODE 55 ADU ERROR
; b2 ERROR CODE 54 FUEL PUMP RELAY FAILURE
; b1 ERROR CODE 53 not used
: b0 ERROR CODE 52 CAL PACK MISSING
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