1. Fuel Pump Relay
The ECM provides ground to one side of the coil in the fuel pump relay to control the fuel pump relay. The other side of the fuel pump relay coil is connected to fuel pump relay, which activates when the ignition switch is ON. The ECM monitors the control circuit between the fuel pump relay and the ECM. When the ignition switch is turned ON, the ECM energizes the fuel pump relay, which sends power to the fuel pump.
Fuel pump relay is located in EMS box of junction box. EMS box integrates main relay, A/C comp. realy, fuel pump relay, ECU fuse and fuel pump fuse.
If there is Open in fuel pump circuit, ECM sets DTC P0230.
Item
Detecting Condition
Possible Cause
DTC Strategy
Circuit continuity check, open
Poor connection
Open or short to ground in power circuit
Open in control circuit
Fuel pump relay
Enable Conditions
Engine speed > 240
Battery voltage = 10.7~16V
Threshold Value
Disconnected
Short circuit to battery
Short circuit to GND
Diagnostic Time
Continuous
MIL ON Condition
DTC only