9-5 (9600) L4-2.3L Turbo (2.3 T) (2006)
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Fuel Pump Relay: Description and Operation
Fuel Pump Relay
The fuel pump relay is located in the relay holder under the dashboard by the steering wheel. The relay supplies the fuel pump and the oxygen sensor
pre-heating.
The fuel pump relay is controlled from pin 50, which is grounded to operate the relay.
When the ignition is turned to the "ON" position, the fuel pump relay will operate for 1 second. This is to build up pressure prior to pre-injection, which
is performed when the crankshaft starts to rotate.
Diagram
Diagnosis
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Diagnostic trouble code P1645 will be generated in the event of a break or short-circuit to ground.
