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 circuit.

  • Harness or connector

  • Heater pump assembly

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

  • Harness or connector

  • Heater pump assembly

  • Heater assembly
049 Heater Fuel Pump Output Error An error is detected in output to the heater pump.

  • Harness or connector

  • Heater pump assembly

  • Heater assembly

WIRING DIAGRAM

A01QRFWE01
*a Heater Pump Assembly
*b Heater Assembly

PROCEDURE


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


    1. Disconnect the A33 heater assembly connector.

    2. Disconnect the A29 heater pump assembly connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A33-2 (L) - A29-1 (B2) Always Below 1 Ω
      A33-2 (L) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. Disconnect the heater pump assembly connector.

    2. A01QSIAC01
      *a

      Front view of wire harness connector

      (to Heater Pump Assembly)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A29-2 (E2) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT HEATER PUMP ASSEMBLY


    1. Remove the heater pump assembly.

      Click here

    2. A01QPMMN01

      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. Inspect heater pump assembly operation.


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

        OK
        The pressure is applied to the hose.
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE HEATER ASSEMBLY Click here

    NG

    REPLACE HEATER PUMP ASSEMBLY Click here