СИСТЕМА SFI, Diagnostic DTC:P0230

DTC Code DTC Name
P0230 Fuel Pump Primary Circuit

DESCRIPTION

When the engine is cranked, a signal is sent from the ignition control 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 STARTER 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.

A001CLWE07
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

A001CGLE02

This troubleshooting procedure is based on the premise that the engine is started. If the engine is not started, proceed to the problem symptoms table Click here.

CAUTION / NOTICE / HINT

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 ECM (FPR VOLTAGE)


    1. A001DW8E02

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

      Standard voltage
      Tester Connection Condition Specified Condition
      A14-6 (FPR) - E3-1 (E1) STA signal ON 11 to 14 V
      A14-6 (FPR) - E3-1 (E1) STA signal OFF 0 to 3 V

    NG

    REPLACE ECM Click here

    OK

  2. INSPECT FUEL PUMP RELAY (F/PMP)


    1. A001DQ3

      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 voltage is 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

    NG

    REPLACE FUEL PUMP RELAY (F/PMP)

    OK

  3. CHECK HARNESS AND CONNECTOR (FUEL PUMP RELAY (F/PMP) - ECM)

    A001BR5E02
    *1 Engine Room No. 2 Relay Block
    *2 ECM Connector

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

    2. Disconnect the A14 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) - A14-6 (FPR) Always Below 1 Ω
      Standard resistance (Check for short)
      Tester Connection Condition Specified Condition
      F/PMP relay (2) or A14-6 (FPR) - Body Ground Always 10 kΩ or higher

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR