SFI SYSTEM, Diagnostic DTC:P144C, P144D

DTC Code DTC Name
P144C Open in Secondary Air Injection System Heater Control Circuit
P144D Short in Secondary Air Injection System Heater Control Circuit

DESCRIPTION

The ECM operates the FUEL PMP/AIR PMP HTR relay which causes the air pump heater to operate.

DTC No. Detection Item DTC Detection Condition Trouble Area MIL Memory
P144C Open in Secondary Air Injection System Heater Control Circuit Open or short in the air pump heater circuit for 5 seconds (1 trip detection logic).

  • Open or short in air pump heater circuit

  • FUEL PMP/AIR PMP HTR relay

  • ECM

 Comes on DTC stored
P144D Short in Secondary Air Injection System Heater Control Circuit Open or short in the air pump heater circuit for 5 seconds (1 trip detection logic).

  • Open or short in air pump heater circuit

  • FUEL PMP/AIR PMP HTR relay

  • ECM

 Comes on DTC stored

MONITOR DESCRIPTION

Frequency of operation Continuous

CONFIRMATION DRIVING PATTERN


  1. Connect the GTS to the DLC3.

  2. Turn the ignition switch to ON and turn the GTS on.

  3. Clear the DTCs (even if no DTCs are stored, perform the clear DTC operation).

  4. Turn the ignition switch off and wait for at least 30 seconds.

  5. Turn the ignition switch to ON and turn the GTS on.

  6. Wait for 10 seconds.

  7. Enter the following menus: Powertrain / Engine and ECT / Active Test / Activate the Air Pump Heater.

  8. Activate the air pump heater for 10 seconds or more.

    Tech Tips


    • The Active Test activates the air pump heater for up to 60 seconds.

    • To protect the air pump heater, do not perform this test more than 4 times in a row.

  9. Enter the following menus: Powertrain / Engine and ECT / Trouble Code.

  10. Read Pending DTCs.

    Tech Tips


    • If a pending DTC is output, the system is malfunctioning.

    • If a pending DTC is not output, perform the following procedure.

  11. Enter the following menus: Powertrain / Engine and ECT / Utility / All Readiness.

  12. Input the DTC: P144C or P144D.

  13. Check the DTC judgment result.

    GTS Tester Display Description
    NORMAL

    • DTC judgment completed

    • System normal
    ABNORMAL

    • DTC judgment completed

    • System abnormal
    INCOMPLETE

    • DTC judgment not completed

    • Perform driving pattern after confirming DTC enabling conditions
    UNKNOWN

    • Unable to perform DTC judgment

    • Number of DTCs which do not fulfill DTC preconditions has reached ECU memory limit

    Tech Tips


    • If the judgment result shows NORMAL, the system is normal.

    • If the judgment result shows ABNORMAL, the system has a malfunction.

WIRING DIAGRAM

Refer to DTC P0412.

Click here

CAUTION / NOTICE / HINT

Note


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

  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

Tech Tips

Read freeze frame data using the GTS. 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. INSPECT FUEL PMP/AIR PMP HTR RELAY


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

      Click here

      Result
      Proceed to
      OK
      NG

    NG

    REPLACE FUEL PMP/AIR PMP HTR RELAY

    OK

  2. CHECK FUEL PMP/AIR PMP HTR RELAY (POWER SOURCE)


    1. Remove the FUEL PMP/AIR PMP HTR relay from the engine room relay block and junction block assembly.

    2. Disconnect the cable from the negative (-) battery terminal.

    3. Disconnect the cable from the positive (+) battery terminal.

    4. 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 2 - Battery positive (+) terminal Always Below 1 Ω
      FUEL PMP/AIR PMP HTR relay terminal 2 or Battery positive (+) terminal - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Remove the FUEL PMP/AIR PMP HTR relay from the engine room relay block and junction 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 - G142-4 (HAI1) Always Below 1 Ω
      FUEL PMP/AIR PMP HTR relay terminal 1 or G142-4 (HAI1) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR