1048OA AIR INTAKE/VACUUM CIRCUIT CHECK - Alfa - 159 - eLearn

	CHECK TO BE PERFORMED	RESOLUTION IF THE CHECK IS NOT OK
1	Check the vacuum supply system components/functions: in particular, check for leaks or blockages.Check the seal of the secondary air inlet/turborcharging system hoses.Also check for any obstructions or porosity.Check for leaks in the intercooler.Check that the pipe restriction bands in the air intake/inlet system are correctly fitted.Check the hoses and connected pipes to identify any obstructions, damage etc.Check that the debimeter is not contaminated.Check the exhaust gas turbocharger and exhaust system components/functions	If possible, renew the pipes. Otherwise replace the faulty components Op. 1048A VACUUM AIR CIRCUIT
2	Check that the air filter is not contaminated	Replace the filter element Op. 1048A14 AIR CLEANER FILTER ELEMENT - REPLACE.
3	Check that the air filter is correctly fitted	Refit correctly Op. 1048A14 AIR CLEANER FILTER ELEMENT - REPLACE.
4	Turn the ignition key to the OFF position.Disconnect the vacuum hose from the vacuum pumpConnect a pressure gauge between the vacuum pump and the hose (see following figure).Start the engine, adjust to idle speed and check that the reading on the pressure gauge is -0.7 and 1.0 bars	Replace the vacuum unit Op. 3330D30 VACUUM PUMP - R+R

	CHECK TO BE PERFORMED	RESOLUTION IF THE CHECK IS NOT OK
5	Turn the ignition key to the OFF position.Reconnect the hose to the vacuum pumpDisconnect the vacuum hose from the turbocharge actuator solenoid (see following figure).Connect the pressure gauge between the solenoid and the hose.Start the engine and adjust to idle speed.Select the following control unit at the diagnostic equipment: EDC16C39 Diesel electronic injection control unit.Carry out active diagnosis: Turbo regulator, ensuring that it is successful	Replace the solenoid valve Op. 1064B42 SOLENOID CONTROLLING TURBOCHARGER VANE POSITION ACTUATOR - R.R

	CHECK TO BE PERFORMED	RESOLUTION IF THE CHECK IS NOT OK
6	Check that the vacuum read on the pressure gauge during active diagnosis is between -0.5 and 1.0 bars.	Check the turbo pressure control solenoid is operating correctly See Test 1064BB CHECK ON OPERATION OF SUPERCHARGING PRESSURE SOLENOID VALVE (PIERBURG)
7	Turn the ignition key to the OFF position.Reconnect the vacuum hose to the turbocharger actuator solenoid.Start the engine and adjust to idle speed.Select the following parameters in the parameter screen: EGR valve opening and measured Air Mass.Set conditions where the EGR valve is open and check that the intake air mass is between 20 and 40 kg/h	Check the exhaust gas recovery solenoid is operating correctly See Test 1080CB E.G.R. SOLENOID FUNCTIONAL TEST
8	Then return to idle speed.Set conditions where the EGR valve is closed and in these conditions check that the intake air mass is between 40 and 60 kg/h	Replace the debimeter Op. 1060G10 AIR FLOW METER - R.R.