4.
Read "DTC Status" parameter.
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.
ECM sets DTC P0230 if the ECM detects the fuel pump relay control circuit is open, shorted to ground or battery.
Item | Detecting Condition | Possible Cause |
DTC Strategy | ● Check open or short to ground/battery in control circuit | ● Open or short in harness ● Contact resistance in connectors ● Faulty relay |
Enable Conditions | ● Battery voltage〉10V | |
Threshold Value | ● Short to ground, line break or short to battery | |
Diagnostic Time | ● 1.5 sec |
Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
Press F4(DTAL) to select DTC information from the DTCs menu.
Confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
Read "DTC Status" parameter.
Is parameter displayed "History(Not Present) fault"?
History (Not Present) fault : DTC occurred but has been cleared.
Present fault : DTC is occurring at present time.
▶ Fault is intermittent caused by poor contact in the sensor's and/or ECM's connector or was repaired and ECM memory was not cleared. Thoroughly check connectors for loose or poor connections, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
▶ Go to "Component Inspection" procedure.
Many malfunctions in the electrical system are caused by poor harness(es) and terminals. Faults can also be caused by interference from other electrical systems, and mechanical or chemical damage.
Thoroughly check connectors for looseness, poor connection, bending, corrosion, contamination, deterioration, or damage.
Has a problem been found?
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
▶ Go to "Power Supply Circuit Inspection" procedure.
Remove the fuel pump relay.
Ignition "ON" & Engine "OFF".
Measure the voltage between terminal 1 of the fuel pump relay harness connector and chassis ground.
Measure the voltage between terminal 5 of the fuel pump relay harness connector and chassis ground.
Specification : Approx. B+
Is voltage within the specification?
▶ Go to "Control Circuit Inspection" procedure.
▶ Check for an open or short to ground in the power supply circuit. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for short to ground in control circuit.
Ignition "OFF" & Relay connector : Disconnected.
Measure resistance between terminal 3 of the relay harness connector and chassis ground.
Specification : Infinite
Is resistance within the specification?
▶ Go to next step as below.
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for short to power in control circuit.
Disconnect ECM connector.
Ignition "ON" and Engine "OFF".
Measure voltage between terminal 3 of the relay harness connector and chassis ground.
Specification : Approx 0V
Is voltage within the specification?
▶ Go to next step as below
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Check for open in control harness.
Measure resistance between terminals 3 of the relay harness connector and 10 of the ECM harness connector.
Specification : Approx 0Ω
Is resistance within the specification?
▶ Thoroughly check connectors for loose or poor connections, bending, corrosion, contamination, deterioration, or damage. Repair or replace as necessary and go to "Verification of Vehicle Repair" procedure.
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Ignition "OFF".
Remove the fuel pump relay.
Apply 12V and a ground to 5 and 3 terminals of the fuel pump relay
Check if the fuel pump relay works well when it is energized. (If the fuel pump relay works normally, a clicking sound can be heard.)
Does the fuel pump relay operate normally?
▶ Go to next step as below.
▶ Check relay for contamination, deterioration, or damage. Substitute with a known-good relay and check for proper operation. If the problem is corrected, replace relay and then go to "Verification of Vehicle Repair" procedure.
After a repair, it is essential to verify that the fault has been corrected.
Connect scan tool and select "Diagnostic Trouble Codes(DTCs)" mode.
Press F4(DTAL) and confirm that "DTC Readiness Flag" indicates "Complete". If not, drive the vehicle within conditions noted in the freeze frame data or enable conditions.
Read "DTC Status" parameter.
Is parameter displayed "History(Not Present) fault"?
▶ System performing to specification at this time. Clear the DTC.
▶ Go to the applicable troubleshooting procedure.
