COMBUSTION TYPE POWER HEATER SYSTEM Power Heater Fuel Pump Circuit

DTC Code DTC Name
Power Heater Fuel Pump Circuit

DESCRIPTION

When the heater switch assembly is turned on, the heater pump assembly receives a drive voltage from the heater assembly. The heater pump assembly provides the heater assembly with fuel necessary for combustion, allowing the heater assembly to operate.

WIRING DIAGRAM

E267498E02

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. E267499C02

      *a

      Front view of wire harness connector

      (to Heater Pump Assembly)

      Disconnect the heater pump assembly connector.

    2. 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. E267500N01

      Remove the heater pump assembly.

      Click hereClick 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. 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
    NG

    REPLACE HEATER PUMP ASSEMBLY

    Click hereClick here

    OK

  4. CHECK HEATER ASSEMBLY

    1. E267499C03

      *a

      Front view of wire harness connector

      (to Heater Pump Assembly)

      Disconnect the heater pump assembly connector.

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

      Standard Voltage

      Tester Connection

      Condition

      Specified Condition

      A29-1 (B2) - Body ground

      Engine running

      Heater switch assembly on

      11 to 14 V

      A29-1 (B2) - Body ground

      Engine running

      Heater switch assembly off

      Below 1 V

    Result

    Proceed to

    OK

    NG
    OK

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE

    Click here

    NG

    REPLACE HEATER ASSEMBLY

    Click hereClick here