Combustion Type Power Heater System Power Heater Fuel Pump Circuit


DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

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

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

INSPECT HEATER PUMP ASSEMBLY

CHECK HEATER ASSEMBLY

COMBUSTION TYPE POWER HEATER SYSTEM - Power Heater Fuel Pump Circuit


DESCRIPTION

When the heater switch assembly (power heater switch) 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


Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Combustion Type Power Heater System Power Heater Fuel Pump Circuit


INSPECTION PROCEDURE

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

  1. Disconnect the A97 heater assembly connector.

  1. Disconnect the A96 heater pump assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A97-2 (L) - A96-1 (B2)
    		Always
    		Below 1 Ω
    A97-2 (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)


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Combustion Type Power Heater System Power Heater Fuel Pump Circuit

  1. Disconnect the heater pump assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A96-1 (E2) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Heater Pump Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT HEATER PUMP ASSEMBLY


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Combustion Type Power Heater System Power Heater Fuel Pump Circuit

  1. Remove the heater pump assembly (LandCruiser RM000005TNE000X.html).

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    2 (B2) - 1 (E2)
    		Always
    		9 to 12 Ω

  1. Inspect heater pump assembly operation.

    1. Connect a positive (+) lead from the battery to terminal 2 (B2) and a negative (-) lead to terminal 1 (E2), and check the pressure of the hose by hand.

      NOTICE:
      This inspection must be done quickly (within 10 seconds) to prevent damage to the heater pump assembly.
      Result
      Result
      		Proceed to
      The pressure is applied to the hose
      		A
      The pressure is not applied to the hose
      		B


B
REPLACE HEATER PUMP ASSEMBLY (LandCruiser RM000005TNE000X.html)
A


4.CHECK HEATER ASSEMBLY


    Land Cruiser, Land Cruiser Prado. Grj150 Trj150,155 Kdj150,155 Lj150, Gdj150,155.Heating Air Conditioning.Air Conditioning System (For Automatic Air Conditioning System).Combustion Type Power Heater System Power Heater Fuel Pump Circuit

  1. Disconnect the heater pump assembly connector.

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A96-2 (B2) - Body ground
    		Engine running, heater switch assembly (power heater switch) on
    		11 to 14 V
    A96-2 (B2) - Body ground
    		Engine running, heater switch assembly (power heater switch) off
    		Below 1 V
    Text in Illustration
    *a
    		Front view of wire harness connector
    (to Heater Pump Assembly)


NG
REPLACE HEATER ASSEMBLY (LandCruiser RM000005TN8000X.html)
OK

PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE (LandCruiser RM0000027G700WX.html)