COMBUSTION TYPE POWER HEATER SYSTEM, Diagnostic DTC:047, 048, 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. DTC Detection Condition Trouble Area
047 A short is detected in the heater pump assembly circuit.

  • Wire harness or connector between combustion heater assembly and heater fuel pump sub-assembly

  • Wire harness or connector between heater fuel pump sub-assembly and body ground

  • Heater fuel pump sub-assembly

  • Power heater ECU (combustion heater assembly)
048

Operation stop of the heater pump assembly is detected.

(Open in the circuit)

  • Wire harness or connector between combustion heater assembly and heater fuel pump sub-assembly

  • Wire harness or connector between heater fuel pump sub-assembly and body ground

  • Heater fuel pump sub-assembly

  • Power heater ECU (combustion heater assembly)
049 An error is detected in output to the heater pump assembly.

  • Wire harness or connector between combustion heater assembly and heater fuel pump sub-assembly

  • Wire harness or connector between heater fuel pump sub-assembly and body ground

  • Heater fuel pump sub-assembly

  • Power heater ECU (combustion heater assembly)

WIRING DIAGRAM

A005L8DE03
*a HEATER FUEL PUMP SUB-ASSEMBLY
*b POWER HEATER ECU (COMBUSTION HEATER ASSEMBLY)

PROCEDURE


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


    1. Disconnect the A29 power heater ECU (combustion heater assembly) connector.

    2. Disconnect the A30 heater fuel pump sub-assembly connector.

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

      Standard Resistance (Check for Open)
      Tester Connection Condition Specified Condition
      A29-2 (L) - A30-1 (+B) Always Below 1 Ω
      Standard Resistance (Check for Short)
      Tester Connection Condition Specified Condition
      A29-2 (L) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A30-2 (E2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT HEATER PUMP ASSEMBLY


    1. A005IGRE09
      Text in Illustration
      *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
      A30-1 (+B) - A30-2 (E2) Always 9 to 12 Ω

    2. Inspect heater fuel pump sub-assembly operation.


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

        CAUTION:


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

        • Always switch the voltage on and off on the battery side, not the heater fuel pump sub-assembly side.

        • Keep the heater fuel pump sub-assembly as far away from the battery as possible.

        OK
        Pressure is applied to the hose.

    OK

    REPLACE COMBUSTION HEATER ASSEMBLY Click here

    NG

    REPLACE HEATER FUEL PUMP SUB-ASSEMBLY Click here