SFI SYSTEM (w/ Dual VVT-i), 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 air pump heater relay which causes the air pump heater to operate.

DTC No. DTC Detection Condition Trouble Area
P144C Open or short in the air pump heater relay circuit for 5 seconds (1 trip detection logic).

  • Open or short in air pump heater relay circuit

  • Air pump heater relay

  • ECM
P144D Open or short in the air pump heater relay circuit for 5 seconds (1 trip detection logic).

  • Open or short in air pump heater relay circuit

  • Air pump heater relay

  • ECM

MONITOR STRATEGY

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 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
    N/A

    • 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.

INSPECTION PROCEDURE

Note


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

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

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 AIR PUMP HEATER RELAY (AIR PMP HTR)


    1. Inspect the air pump heater relay (AIR PMP HTR) Click here.


    NG

    REPLACE AIR PUMP HEATER RELAY (AI-PMP HTR)

    OK

  2. CHECK AIR PUMP HEATER RELAY (POWER SOURCE)


    1. Remove the air pump heater relay (AIR PMP HTR).

    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
      Air pump heater relay (AIR PMP HTR) terminal 2 - Battery positive (+) terminal Always Below 1 Ω
      Air pump heater relay (AIR PMP HTR) terminal 2 or Battery positive (+) terminal - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (ECM - AIR PUMP HEATER RELAY (AIR PMP HTR))


    1. Remove the air pump heater relay (AIR PMP HTR).

    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
      Air pump heater relay (AIR PMP HTR) terminal 1 - B94-25 (HAI1) Always Below 1 Ω
      Air pump heater relay (AIR PMP HTR) terminal 1 or B94-25 (HAI1) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

    REPLACE ECM Click here