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.

A01GJ9RE04
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

  • F/PMP relay

  • ECM

WIRING DIAGRAM

A01GJQ3E02

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.

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 ECM (FPR VOLTAGE)


    1. A01GJ89E23

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

    2. Inspect the F/PMP relay Click here.


    NG

    REPLACE FUEL PUMP RELAY (F/PMP)

    OK

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

    A01GHQWE02

    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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here