SFI SYSTEM, Diagnostic DTC:P0230

DTC Code DTC Name
P0230 Fuel Pump Primary Circuit

DESCRIPTION

When the engine is cranked, a signal is sent from the main body ECU's STSW terminal to the ECM's STSW terminal. Then voltage travels from the ECM's STAR terminal through the park/neutral position switch to the ST relay coil. The STAR terminal also sends a signal to the STA terminal. When the STA signal and NE signal are input to the ECM, the ECM interior's Tr1 turns ON, which causes power to be supplied to the C/OPN relay coil (C/OPN ON). As a result, the F/PMP relay actuates, which causes the fuel pump to operate. If the engine is operating and NE signals are being output, the ECM interior's Tr1 is ON (C/OPN ON), and the fuel pump will continue operating. The fuel pump has a high and low speed setting. When the engine is starting or operating with a heavy load, the ECM interior's Tr2 turns ON to actuate the F/PMP relay so that the fuel pump operates at the high speed setting. When the engine is idling or operating with a light load, the Tr2 turns OFF, and current flows through the fuel pump resistor to the fuel pump so that the fuel pump operates at the low speed setting.

A016346E01
DTC No. DTC Detection Condition Trouble Area
P0230

Open or short in F/PMP relay circuit

(1 trip detection logic)

  • Open or short in F/PMP relay circuit

  • FUEL PUMP relay (F/PMP)

  • ECM

WIRING DIAGRAM

A0160FLE08

This troubleshooting procedure is based on the premise that the engine is started. If the engine is not started, proceed to Problem Symptoms Table Click here.

INSPECTION PROCEDURE

Tech Tips

Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

PROCEDURE


  1. CHECK FUEL PUMP OPERATION


    1. Check if there is pressure in the fuel inlet hose.

      Tech Tips

      If there is fuel pressure, the sound of fuel flowing can be heard.


    NG

    GO TO FUEL PUMP CONTROL CIRCUIT Click here

    OK

  2. CHECK ECM (FRP VOLTAGE)


    1. A015Z7TE87

      Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Condition Specified Condition
      A5-6 (FPR) - E6-1 (E1) STA signal ON 11 to 14 V
      A5-6 (FPR) - E6-1 (E1) STA signal OFF 0 to 3 V

    NG

    INSPECT FUEL PUMP RELAY (F/PMP) Click here

    OK

    REPLACE ECM Click here

  3. INSPECT FUEL PUMP RELAY (F/PMP)


    1. A0160W2E01

      Remove the F/PMP relay from the engine room No. 2 relay block.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 4 When no battery applied to terminals 1 and 2 Below 1 Ω
      3 - 4 When battery voltage is applied to terminals 1 and 2 10 kΩ or more

    3. Reinstall the F/PMP relay.


    NG

    REPLACE FUEL PUMP RELAY (F/PMP)

    OK

  4. CHECK HARNESS AND CONNECTOR (F/PMP RELAY - ECM)


    1. A0160KGE02

      Remove the F/PMP relay from the engine room No. 2 relay block.

    2. Disconnect the ECM connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      F/PMP relay (2) - A5-6 (FPR) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      F/PMP relay (2) or A5-6 (FPR) - Body Ground Always 10 kΩ or higher

    4. Reinstall the F/PMP relay.

    5. Reconnect the ECM connector.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (F/PMP RELAY - ECM)

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (F/PMP RELAY - C/OPN RELAY)