Neon L4-2.0L VIN C (1997)
Fuel Pump Relay: Description and Operation
Fuel Pump Relay Operation
NAME OF CODE:
Fuel Pump Relay Control Circuit
WHEN MONITORED:
With the ignition key ON and battery voltage greater than 10 volts.
SET CONDITION:
An open or shorted condition is detected in the fuel pump relay control circuit.
THEORY OF OPERATION:
The fuel pump relay controls the 12-volt source to the fuel pump. If the vehicle is equipped with a power distribution center, the relay is located in
the Power Distribution Center (PDC). One side of the relay control coil is supplied with 12 volts when the ignition switch is turned to the "RUN"
position. The circuit is completed when the other side of the relay coil is grounded by the powertrain control module (PCM). The PCM grounds
the relay when the ignition switch is in either the RUN or CRANK position and engine RPM is detected. If engine RPM is not detected, the PCM
will remove the fuel pump relay control circuit ground.
POSSIBLE CAUSES:
-
Relay coil open or shorted
-
Fused ignition switch output circuit open
-
Fuel pump relay control circuit is open or shorted
-
Inoperative circuit driver in powertrain control module
