Air Injection: Service and Repair

Secondary Air Injection (AIR) system components, removing and installing


NOTE:
- Cylinder bank 1 is located on right side in direction of travel.
- Cylinder bank 2 is located on left side in direction of travel.


Component locations of the relays and fuses in protective housing (plenum chamber, left) Fig. 1.







1 Pressure hose
- Check for secure fitting
- To disengage, squeeze together at front
2 Seal
3 Combination valve
- Cylinder bank 1
4 Combination valve
- Cylinder bank 2
5 Vacuum connection
- at upper part of intake manifold, item 11
6 Flange
- at cylinder head
7 Connecting piece
8 Bracket
- for oil separator
9 10 Nm
10 Vacuum hose
- from Left Electro-Hydraulic Engine Mount Solenoid Valve-N144-
11 Secondary Air Injection (AIR) Solenoid Valve -N112-*
12 Check-valve
- Note installed position
13 Mounting clip
14 Air filter housing
15 Secondary Air Injection (AIR) Pump Motor-V101-*

Fig. 1 Component locations of the relays and fuses in protective housing (plenum chamber, left)







1 Fuse for injectors -S116-
for Cylinder 1 Fuel Injector -N30- to Cylinder 4 Fuel Injector -N33-, Cylinder 5 Fuel Injector -N83- to Cylinder 8 Fuel Injector -N86-
2 Engine Control Module (ECM) Fuse -S102-
for Motronic Engine Control Module (ECM) -J220-
3 Fuse for ignition coil terminal 15 -S115-
for Ignition Coil 1 with Power Output Stage -N70-, Ignition Coil 2 with Power Output Stage -N127-, Ignition Coil 3 with Power Output Stage -N291-, Ignition Coil 4 with Power Output Stage -N292-, Ignition Coil 5 with Power Output Stage -N323- to Ignition Coil 8 with Power Output Stage -N326-
4 Fuse for secondary air pump -S130- for Secondary Air Injection (AIR) Pump Relay
5 Motronic Engine Control Module (ECM) Power Supply Relay -J271-
6 Secondary Air Injection (AIR) Pump Relay -J299-
7 Engine Electronics Fuse -S282-for several relays
8 Auxiliary Engine Coolant (EC) Pump Relay -J496-


NOTE:
- Remove battery Ground (GND) strap if tools are necessary for removal of relays or control modules from the relay carrier.
- Obtain radio code for radios with anti-theft coding before disconnecting battery.
- Check relay activation.