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. 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

B0044CLE01
*a Heater Pump Assembly
*b Heater Assembly

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
    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
    OK
  3. INSPECT HEATER PUMP ASSEMBLY


    1. B0042Z1C01
      *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
    NG