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

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

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

  • Heater pump assembly

  • Power heater ECU (combustion heater assembly)
048

Operation stop of the heater pump assembly is detected.

(Open in the circuit)
049 An error is detected in output to the heater pump assembly.
Table 1. *a Heater Pump Assembly *b Power Heater ECU (Combustion Heater Assembly)
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WIRING DIAGRAM

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PROCEDURE


  1. Click here

    INSPECT HEATER PUMP ASSEMBLY


    1. Inspect the heater pump assembly (Click here).


  2. Click here

    CHECK HARNESS AND CONNECTOR (POWER HEATER ECU (COMBUSTION HEATER ASSEMBLY) - HEATER PUMP ASSEMBLY)


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

    2. Disconnect the A30 heater pump assembly connector.

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

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

    • OKClick here
    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. Click here

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


    1. Disconnect the A30 heater pump assembly connector.

    2. 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

    • OK

      REPLACE COMBUSTION HEATER ASSEMBLY (Click here)

    • NG

      REPAIR OR REPLACE HARNESS OR CONNECTOR