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

A01IQIUE02

INSPECTION PROCEDURE

PROCEDURE


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


    1. A01IPGHE04
      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 A41 heater connector.

    2. Disconnect the A42 pump connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A41-2 (L) - A42-1 (B2) Always Below 1 Ω
      A41-2 (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. A01ISXLE05
      Text in Illustration
      *1

      Front view of wire harness connector

      (to Heater Pump Assembly)

      Disconnect the A42 pump connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A42-2 (E2) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT HEATER PUMP ASSEMBLY


    1. A01ITQWE06

      Remove the heater pump assembly with the fuel hose still connected Click here.

    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. Apply battery voltage to the heater pump assembly and check the pressure of the hose by hand.

      OK
      Measurement Condition Specified Condition

      Battery positive (+) → Terminal 1

      Battery negative (-) → Terminal 2

      		 Pressure is applied to the hose

      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.


    NG

    REPLACE HEATER PUMP ASSEMBLY Click here

    OK

    REPLACE HEATER ASSEMBLY Click here