Want this question answered?
# Disconnect negative battery cable # Place protective covers on each fender # Drain the cooling system # If equipped with an air pump it as follows: Loosen thermactor pump adjusting bolt and remove belt.Remove thermactor pump hose clamp located below the thermactor pump # Remove the thermactor pump bracket bolts # Remove thermactor pump and bracket as an assembly # Loosen the water pump idler pulley and remove the belt from the water pump pulley # Disconnect the heater hose at the water pump or the water pump inlet tube.Disconnect the water pump inlet tube if equipped # Clean any old gasket material that may remain on the engine surface
On the passenger side under the hood there is two fuse boxes. the smaller one will have the two fuses for the air pump. The top 50 amp fuse is for the air pump the bottom one is the Air relay.
A P0411 code means: Secondary Air Injection System upstream flow. The air pump supplies oxygen to the exhaust manfolds during the first few minutes after the car is started. The PCM controls the EAM relay which controls the EAM air pump. Check: The 30 amp fuse label "Thermactor Pump Fuse." Voltage to the air pump should be battery voltage. The air hoses on the air pump for damage or blockage. Check the vacuum hoses to the one or two vacuum controled air diverter valves. PCM controled vaccum switch for deverter values. This link here may be of some help http://v8sho.com/SHO/DTCP0411P1411DiagnosticRoutines.htm
If the secondary air injection failure code comes up you shold propably check the air pump fuse. I think it is call the air pump. The fuse is rather big. Sometimes water gets into the air pump and causes it to trip out. the fuse is loacated on the front pasengerside close to the bumper. Some people say that you will know that the fuse is out on the air pump because the hood light goes out. That's not really true in all cases.
# Disconnect negative battery cable # Drain the cooling system # If equipped with an air pump it as follows: Loosen thermactor pump adjusting bolt and remove belt.Remove thermactor pump hose clamp located below the thermactor pump # Remove the thermactor pump bracket bolts # Remove thermactor pump and bracket as an assembly # Loosen the water pump idler pulley and remove the belt from the water pump pulley # Disconnect the heater hose at the water pump or the water pump inlet tube.Disconnect the water pump inlet tube if equipped # Clean any old gasket material that may remain on the engine surface
Fuel pump relay fuse is under the hood drivers side next to air filter.
check fuse/relay then if not that idle air control valve 'throttle control sensor' map sensor' electronic control module' test them all.
check the front under the car and see if levelers are broken off there on the lower control arm in the front
Something is wrong with the rear air shocks- either it is the shocks them selves or most of the time the air pump... But first check your fuse to the air pump. see owners manual for fuse location.
You can reset your 1999 Cadillac Deville air conditioning control by removing the air conditioning control fuse. Keep the fuse out for 10 seconds and then replace it to its original position.
I had to dig out an old Haynes repair manual for that question The managed air thermactor system injects fresh air into the hot exhaust gasses leaving the exhaust ports to reduce the concentration of carbon monoxide and hydrocarbons and convert them into carbon dioxide and water (Helpfull)
The fuse is next to battery; under the horn, in the opening in the fender well.