HT4100 4.1, 4.5, 4.9 Discussion, 1990 feleetwood codes on air control panel in Cadillac Engine Technical Discussion; hi still looking for a post on the codes . not what they mean but the buttons to push to ...
a). Off and Warmer together on the ECC.
b). Watch for codes on the FUEL DISPLAY,
c). at 7.0 press the HI button once E.9.5 will be displayed on FD
d). Press the econ and warmer button together, display will show E.5.0
e). Press HI to get to ECM override E.5.4 Cylinder balance test.
f). Warmer cycles through INJ 01-08, cooler turns off each injector drive cct.