COMBUSTION TYPE POWER HEATER SYSTEM, Diagnostic DTC:047,048 and 049

DTC Code DTC Name
047 Short in Heater Fuel Pump Circuit
048 Heater Fuel Pump Malfunction
049 Heater Fuel Pump Output Error

DESCRIPTION

DTC No.

Detection Item

DTC Detection Condition

Trouble Area

047

Short in Heater Fuel Pump Circuit

A short is detected in the heater pump assembly circuit.

  • Harness or connector between heater pump assembly and heater assembly

  • Harness or connector between heater pump assembly and body ground

  • Heater pump assembly

  • Heater assembly

048

Heater Fuel Pump Malfunction

Operation stop of the heater pump assembly is detected. (Open in the circuit)

  • Harness or connector between heater assembly and heater pump assembly

  • Harness or connector between heater pump assembly and body ground

  • Heater pump assembly

  • Heater assembly

049

Heater Fuel Pump Output Error

An error is detected in output to the heater pump assembly.

  • Harness or connector between heater assembly and heater pump assembly

  • Harness or connector between heater pump assembly and body ground

  • Heater pump assembly

  • Heater assembly (ECU)

WIRING DIAGRAM

E267055E01

PROCEDURE

  1. CHECK HARNESS AND CONNECTOR (HEATER ASSEMBLY - HEATER PUMP ASSEMBLY)

    1. Disconnect the A42 heater assembly connector.

    2. Disconnect the A99 heater pump assembly connector.

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A42-2 (L) - A99-1

      Always

      Below 1 Ω

      A42-2 (L) - Body ground

      Always

      10 kΩ or higher

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (HEATER PUMP ASSEMBLY - BODY GROUND)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      A99-2 - Body ground

      Always

      Below 1 Ω

    Result

    Proceed to

    OK

    NG
    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT HEATER PUMP ASSEMBLY

    1. E124460C01

      *a

      Component without harness connected

      (Heater Pump Assembly)

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

      Standard Resistance

      Tester Connection

      Condition

      Specified Condition

      1 - 2

      Always

      9 to 12 Ω

    2. Inspect heater pump assembly operation.

      1. Connect a positive (+) lead from the battery to terminal 1 and a negative (-) lead to terminal 2, and check the pressure of the hose by hand.

        Note:

        This inspection must be done quickly (within 10 seconds) to prevent damage to the heater pump assembly.

        OK

        Pressure is applied to the hose.

    Result

    Proceed to

    OK

    NG
    OK

    REPLACE HEATER ASSEMBLY

    Click hereClick hereClick here

    NG

    REPLACE HEATER PUMP ASSEMBLY

    Click hereClick hereClick hereClick here