9-5 SE Sedan (9600) V6-3.0L Turbo (B308) (1999)
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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 near the steering wheel. The relay supplies the fuel pump and oxygen sensor
preheater with current.
The fuel pump relay is controlled from pin 50 which is grounded so that the relay will operate.
When the ignition switch is turned to "ON," the fuel pump relay operates for 1 second. This is to build up pressure before pre-injection, which takes
place when the crankshaft begins to rotate.
Diagnostics
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In the event of a break or short-circuit to ground, diagnostic trouble code P1654 will be generated.
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In the event of a short-circuit to B+, diagnostic trouble code P1655 will be generated.
NOTE: The pump runs for 1 second when the ignition is switched on.
