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 Code DTC Detection Condition Trouble Area
047 A short is detected in the heater pump circuit.

  • Harness or connector

  • Heater pump assembly

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

  • Harness or connector

  • Heater pump assembly

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

  • Harness or connector

  • Heater pump assembly

  • Heater assembly

WIRING DIAGRAM

A01XG1GE03
*a Heater Pump Assembly
*b Heater Assembly

PROCEDURE


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


    1. Disconnect the A97 heater assembly connector.

    2. Disconnect the A96 heater pump assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A97-2 (L) - A96-2 (B2) Always Below 1 Ω
      A97-2 (L) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01XCAIE02
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Heater Pump Assembly)

      Disconnect the heater pump assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A96-1 (E2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT HEATER PUMP ASSEMBLY


    1. A01XIICE13

      Remove the heater pump assembly Click here.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      2 (B2) - 1 (E2) Always 9 to 12 Ω

    3. Inspect the heater pump assembly operation.


      1. Connect a positive (+) lead from the battery to terminal 2 (B2) and a negative (-) lead to terminal 1 (E2), 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.

      Result
      Result Proceed to
      The pressure is applied to the hose A
      The pressure is not applied to the hose B

    A

    REPLACE HEATER ASSEMBLY Click here

    B

    REPLACE HEATER PUMP ASSEMBLY Click here