Fig. 99. Elements of the additional air supply system: 1 - air channel in the cylinder head; 2 - bolt, 25 Nm; 3 - vacuum hose; 4 - lifting eye; 5 - holder; 6 - additional inlet valve */**; 7 - plug-in block; 8 - vacuum hose; 9 - inlet hose; 10 - Air pump motor*; 11 - plug-in block; 12 - holder; 13 - bolt, 10 Nm; 14 - Hose clamp; 15 - pressure hose; 16 - holder; 17 - combination valve; 18 - bolt, 15 Nm; 19 - O-ring ___________ * The condition of this part is monitored by the self-diagnosis device. ** The condition of the part is monitored in the "final conclusion on malfunctions"
After each subsequent engine start and until the engine temperature reaches 85°C, the additional air supply system (Fig. 99) is switched on with a delay of 20 s and operates at engine idle for 5 s, while the system operation is monitored by a self-diagnostic device.
The condition of the additional air supply system components is monitored either in the "final conclusion on malfunctions" or if any defect appears, it will be recorded in the malfunction recorder. When accessing the memory of the malfunction recorder (work is carried out at the service station), the fault is easy to diagnose and can then be corrected.
For some positions (Fig. 99) the following additional explanations are given:
- additional air is pumped into air duct 1 of the cylinder head;
- lifting eye 4 is screwed on the left side of the cylinder head;
- an additional air supply valve is screwed into clamp 5;
- plug connector 7 is placed on the inlet valve (black);
- vacuum hose 8 is connected between the upper part of the intake manifold and the fuel distribution line;
- the inlet hose 9 comes from the top of the air filter. Its connection must be tight, without air entering;
- plug 11 is for the air pump motor. It is black and has two pin terminals;
- holder 12 holds the air pump motor. It is screwed into the cooling fan air intake;
- hose clamp 14 secures the inlet hose;
- pressure hose 15 is attached between pump motor 10 and combination valve 17;
- holder 16 secures the combination valve to the oil level dipstick guide tube;
- always replace the O-ring 19.
(The original can be seen on the portal: www.VWmanual.ru)
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