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

E181362E02

PROCEDURE

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

    1. U123703E01

      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
      Table 1. Text in Illustration

      *1

      Front view of wire harness connector

      (to Heater Assembly)

      *2

      Front view of wire harness connector

      (to Heater Pump Assembly)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

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

    1. U123707E01

      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
      Table 2. Text in Illustration

      *1

      Front view of wire harness connector

      (to Heater Pump Assembly)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

  3. INSPECT HEATER PUMP ASSEMBLY

    1. E176914E06

      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.

    REPLACE HEATER ASSEMBLY

    (Click here)

    REPLACE HEATER PUMP ASSEMBLY

    (Click here)