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SFI SYSTEM, Diagnostic DTC:P144C, P144D

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

Refer to DTC P0412 (Click here).

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CAUTION / NOTICE / HINT

Note:

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

Tip:

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.

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PROCEDURE


  1. Click here

    INSPECT AIR PUMP HEATER RELAY (AIR PMP HTR)


    1. Inspect the integration relay (AIR PMP HTR) (Click here).


    • OKClick here
    • NG

      REPLACE INTEGRATION RELAY (AIR PMP HTR)

  2. Click here

    CHECK AIR PUMP HEATER RELAY (POWER SOURCE)


    1. Remove the integration relay (AIR PMP HTR).

    2. B001Z5BE03

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

      Standard Voltage
      Table 1. for LHD:
      Tester Connection Condition Specified Condition
      1Y-1 - Body ground Always 11 to 14 V
      Table 2. for RHD:
      Tester Connection Condition Specified Condition
      1X-1 - Body ground Always 11 to 14 V
      Table 3. Text in Illustration
      *A for LHD:
      *B for RHD:
      *a Front view of wire harness connector (to Integration Relay)

    3. Reinstall the integration relay (AIR PMP HTR).


    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

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


    1. Remove the integration 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
      1P-10 - C45-61 (HAI1) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      1P-10 or C45-61 (HAI1) - Body ground Always 10 kΩ or higher

    4. Reinstall the integration relay (AIR PMP HTR).

    5. Reconnect the ECM connector.


    • OK

      REPLACE ECM (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR