Fuel Pump Relay Control Circuit

NAME OF CODE
Fuel Pump Relay Control Circuit

WHEN MONITORED
With the ignition key on and battery voltage greater than 10.4 volts

SET CONDITION
An open or shorted condition is detected in the the pump relay control circuit.

THEORY OF OPERATION
The fuel pump relay controls the 12-volt source to the fuel pump. 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. The Powertrain Control Module (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
- Connector terminals
- Connector wires