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 AIR PMP HTR relay which causes the air pump heater to operate.

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

  • Open or short in AIR PMP HTR relay circuit

  • AIR PMP HTR relay

  • ECM
P144D Open or short in the AIR PMP HTR relay circuit for 5 seconds (1 trip detection logic).

  • Open or short in AIR PMP HTR relay circuit

  • AIR PMP HTR relay

  • ECM

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.

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 PMP HTR RELAY


    1. Inspect the AIR PMP HTR relay Click here.


    NG

    REPLACE AIR PMP HTR RELAY

    OK

  2. CHECK AIR PMP HTR RELAY (POWER SOURCE)


    1. Remove the AIR PMP HTR relay.

    2. B001CP1E01
      Text in Illustration
      *1 Engine Room Relay Block
      *2 AIR PMP HTR Relay

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      AIR PMP HTR relay terminal 1 - Body ground Engine switch on (IG) 11 to 14 V

    3. Reinstall the AIR PMP HTR relay.


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Remove the AIR PMP HTR relay.

    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 PMP HTR relay terminal 2 - G56-30 (HAI1) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      AIR PMP HTR relay terminal 2 or G56-30 (HAI1) - Body ground Always 10 kΩ or higher

    4. Reinstall the AIR PMP HTR relay.

    5. Reconnect the ECM connector.


    OK

    REPLACE ECM Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR