P1939
Fuel fired heater control - circuit high
P1938
Fuel fired heater control - circuit low
P1937
Fuel fired heater control - circuit/open
P1936
Clutch switch/sensor signal
P1935
Brake switch/sensor signal
P1934
Vehicle speed signal
P1933
Fuel level signal
P1932
Fuel additive level - circuit low
P1931
Fuel additive pump control - circuit high
P1928
Fuel additive pump control - circuit/open