3.
Has a problem been found?
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure
▶ Go to "Component Inspection" procedure
The PCM 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 PCM monitors the control circuit between the fuel pump relay and the PCM. When the ignition switch is turned ON, the PCM energizes the fuel pump relay, which sends power to the fuel pump.
PCM sets DTC P0230 if the PCM detects the fuel pump relay control circuit is open, short to ground or battery.
ITEM | DETECTING CONDITION | POSSIBL ECAUSE |
DTC Strategy | ● Check open or short to ground/battery in control circuit | ● Open or short in harness ● Contact resistance in connectors ● Faulty fuel pump relay |
Enable Condition | ● 10V ＜ Battery voltage ＜ 16V | |
Threshold Value | ● Open, short to battery or short to ground | |
Diagnostic Time | ● 3 seconds |
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 "Component Inspection" procedure
Remove the fuel pump relay.
Ignition "ON" & Engine "OFF".
Measure the voltage between terminal 5 of the fuel pump relay harness connector and chassis ground.
Measure the voltage between terminal 1 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 PCM connector
Ignition "ON" & 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 69 of the PCM harness connector.
Specification : Approx 0Ω
Is resistance within the specification?
▶ Thoroughly Check for poor connection between PCM and component: backed out terminal, improper mating, broken locks or poor terminal to wire connection. Repair as necessary and go to "Verification of Vehicle Repair" procedure.
▶ Repair as necessary and go to "Verification of Vehicle Repair" procedure.
Ignition "OFF" & Engine "OFF"
Remove the fuel pump relay.
Apply 12V and a ground to 5 and 3 of the fuel pump relay(Component side).
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.
