Air Injection

��r Pump And Valve For Secondary Air Injection:

WIRING DIAGRAM

Pump And Valve For Secondary Air Injection: Component Location:

COMPONENT LOCATION VIEW

Pump And Valve For Secondary Air Injection: Component ID:

COMPONENT ID
75 Distribution block (+30 circuit) on the battery tray.
159 Distribution terminal (+15 circuit), in main fuse box behind the glove box access flap.
324 Relay, secondary air injection, in main fuse box in front of the battery.
325 Secondary air injector behind the left- hand headlamp.
326 Secondary air injection pump, behind the left-hand headlamp.
342a Main fuse box, in engine bay in front of the battery.
430 Saab Trionic control module, in engine bay on the left behind the bulkhead partition.
510 Motronic M2.8.1 control module in the engine bay behind the bulkhead partition.
587 Motronic M5.2 control module in the engine bay behind the bulkhead partition.

2-Pin Connector
H2-79 Connector beside the air pump.

10-Pin Connector
H10-15 Behind the left-hand headlamp.

70-Pin Connector
H70-1 In the engine bay, behind the bulkhead partition.

Grounding Points
G30 Grounding point, on left-hand structural member behind the left-hand headlamp.

DESCRIPTION OF OPERATION
In certain markets the engine management system is equipped with a secondary air injection system. This consists of an air pump and a valve.

Both these components are controlled by their own control modules, which ground relay 324. The coil of this relay is supplied with current from distribution terminal 159. The relay contact is connected to distribution block 75.

To get the catalytic converter working as soon as possible after a cold start, ambient air is pumped into the exhaust manifold where the oxygen in the air starts a chemical combustion process.

When the engine has started, secondary air injection pump 326 starts and boost pressure control valve 325 opens the connection to the exhaust manifold.

The function is time and temperature dependent. The boost pressure control valve closes and the pump stops after a maximum of 80 seconds or when engine temperature reaches 65 °C.

Secondary Air Injection Pump 326
When the engine management system's control module grounds relay 324, the relay contact closes and current is supplied to the pump via maxi fuse 1. The pump then starts.

Secondary Air Injection Control Valve 325
When relay 324 operates, current is also supplied to the valve via fuse 13. The valve then opens.

FAULT DIAGNOSIS HINTS
1. Check that current is supplied to the relay contact and relay coil.
2. Check fuse 1 (maxi) and fuse 13.
3. Check the cables, connectors and grounding points in question.