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 assembly circuit.

  • Harness or connector

  • Heater pump assembly

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

  • Harness or connector

  • Heater pump assembly

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

  • Harness or connector

  • Heater pump assembly

  • Heater assembly (ECU)

WIRING DIAGRAM

A004RZVE01
*a Heater Pump Assembly
*b Heater Assembly

PROCEDURE


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


    1. A004SERE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Heater Assembly)
      *2

      Front view of wire harness connector

      (to Heater Pump Assembly)

      Disconnect the A54 heater assembly connector.

    2. Disconnect the A55 heater pump assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A54-2 (L) - A55-1 (B2) Always Below 1 Ω
      A54-2 (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. A004P1ZE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Heater Pump Assembly)

      Disconnect the A55 heater pump assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A55-2 (E2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT HEATER PUMP ASSEMBLY


    1. A004S1RE03
      Text in Illustration
      *1

      Component without harness connected

      (Heater Pump Assembly)

      Disconnect the A55 heater pump assembly connector.

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

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

    3. 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.

      Note


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

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

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

      OK
      Pressure is applied to the hose.

    OK

    REPLACE HEATER ASSEMBLY Click here

    NG

    REPLACE HEATER PUMP ASSEMBLY Click here