SFI SYSTEM, Diagnostic DTC:P0230

DTC Code DTC Name
P0230 Fuel Pump Primary Circuit

DESCRIPTION

The FUEL PMP/AIR PMP HTR relay switches the fuel pump speed according to the engine conditions. The fuel pump operates when the ECM receives the STA signal and NE signal. The FUEL PMP/AIR PMP HTR relay is turned on while the engine is idling or operating at low load. This causes current to flow through the fuel pump resistor to the fuel pump. The fuel pump then operates at low speed. The FUEL PMP/AIR PMP HTR relay is turned off while the engine is cranking or operating at high load. The fuel pump then operates at normal speed.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P0230 Fuel Pump Primary Circuit

Open or short in FUEL PMP/AIR PMP HTR relay circuit

(1 trip detection logic)

  • Open or short in FUEL PMP/AIR PMP HTR relay circuit

  • FUEL PMP/AIR PMP HTR relay

  • ECM

 - DTC stored

MONITOR DESCRIPTION

This DTC is designed to detect a malfunction in the FUEL PMP/AIR PMP HTR relay circuit. When the system is normal, battery voltage is applied to the FPR terminal of the ECM while the FUEL PMP/AIR PMP HTR relay is off. If battery voltage is not applied to the FPR terminal while the FUEL PMP/AIR PMP HTR relay is off, the ECM interprets this as a malfunction. The ECM then illuminates the MIL and stores a DTC.

WIRING DIAGRAM

B0026GAE01

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

Tech Tips

Read freeze frame data using the GTS. The ECM records vehicle and driving condition information as freeze frame data the moment a DTC is stored. 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. INSPECT FUEL PUMP RELAY (FUEL PMP/AIR PMP HTR)


    1. Inspect the FUEL PMP/AIR PMP HTR relay.

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE RELAY (FUEL PMP/AIR PMP HTR)

    OK

  2. CHECK TERMINAL VOLTAGE (FUEL PMP/AIR PMP HTR RELAY)

    B0028QMC01
    *1 Engine Room Relay Block Assembly
    *2 FUEL PMP/AIR PMP HTR

    1. Remove the FUEL PMP/AIR PMP HTR relay from the Engine Room Relay Block Assembly.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      FUEL PMP/AIR PMP HTR relay terminal 2 - Body ground Cranking 11 to 14 V
      FUEL PMP/AIR PMP HTR relay terminal 2 - Body ground Ignition switch ON 0 to 3 V
      Result
      Proceed to
      OK
      NG

    NG

    CHECK FUEL PUMP CONTROL CIRCUIT Click here

    OK

  3. CHECK HARNESS AND CONNECTOR (FUEL PMP/AIR PMP HTR RELAY - ECM)


    1. Remove the FUEL PMP/AIR PMP HTR relay from the Engine Room Relay Block Assembly.

    2. Disconnect the ECM connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      FUEL PMP/AIR PMP HTR relay terminal 1 - G87-4 (FPR) Always Below 1 Ω
      FUEL PMP/AIR PMP HTR relay terminal 1 or G87-4 (FPR) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (FUEL PMP/AIR PMP HTR RELAY - ECM)