Fuel pump of FR type GDI engine is controlled low or high speed by turning on or off fuel pump relay and fuel pump relay (low). During start the engine, WOT, acceleration, the ECM operates fuel pump at a high speed by turning on fuel pump relay and fuel pump relay (low) and during idle, a constant vehicle speed, ECM operates fuel pump at a low speed by turning on fuel pump relay and turning off fuel pump relay (low). On low speed mode, Fuel pump is powered through resister line, in case of high speed mode, fuel pump is powered through the line not passing through resister.
ECM monitors fuel pump resister circuit continuously. If an open or short in the circuit is detected ECM sets a P0232 DTC.
Item
Detecting Condition
Possible Cause
DTC Strategy
Signal Low or High
Poor connection
Open or short in fuel pump resister circuit
Fuel Pump Resister
Enable Conditions
Battery Voltage between 11V and 16V
Threshold value
Open or short
Diagnosis Time
Continuous (more than 5 sec. failure for every 10 sec.test)
MIL On Condition
NO MIL ON(DTC only)