DTC    047    Short in Heater Fuel Pump Circuit

DTC    048    Heater Fuel Pump Malfunction

DTC    049    Heater Fuel Pump Output Error

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DESCRIPTION


DTC No.
DTC Detection Condition
Trouble Area
047
A short is detected in the heater pump assembly circuit.
  1. Wire harness or connector between combustion heater assembly and heater pump assembly
  2. Wire harness or connector between heater pump assembly and body ground
  3. Heater pump assembly
  4. Power heater ECU (combustion heater assembly)
048
Operation stop of the heater pump assembly is detected.
(Open in the circuit)
  1. Wire harness or connector between combustion heater assembly and heater pump assembly
  2. Wire harness or connector between heater pump assembly and body ground
  3. Heater pump assembly
  4. Power heater ECU (combustion heater assembly)
049
An error is detected in output to the heater pump assembly.
  1. Wire harness or connector between combustion heater assembly and heater pump assembly
  2. Wire harness or connector between heater pump assembly and body ground
  3. Heater pump assembly
  4. Power heater ECU (combustion heater assembly)

WIRING DIAGRAM


E176187E01


INSPECTION PROCEDURE

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


    E176772E01

  1. Disconnect the A45 power heater ECU (combustion heater assembly) connector.

  1. Disconnect the A42 heater pump assembly connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A45-2 (L) - A42-1 (+B)
    		Always
    		Below 1 Ω
    A45-2 (L) - Body ground
    		Always
    		10 kΩ or higher

  1. Reconnect the heater pump assembly connector.

  1. Reconnect the power heater ECU (combustion heater assembly) connector.

Text in Illustration 
*1
Front view of wire harness connector
(to Power Heater ECU (Combustion Heater Assembly))
*2
Front view of wire harness connector
(to Heater pump assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


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

  1. Disconnect the A42 heater pump assembly connector.



    E176913E01

  1. 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

  1. Reconnect the heater pump assembly connector.

Text in Illustration 
*1
Front view of wire harness connector
(to Heater pump assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


3.INSPECT HEATER PUMP ASSEMBLY

  1. Disconnect the A42 heater pump assembly connector.



    E176914E01

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

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

  1. Inspect heater pump assembly operation.

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

      CAUTION:
      1. This inspection must be done quickly (within 10 seconds) to prevent damage to the heater pump assembly.
      2. Always switch the voltage on and off on the battery side, not the heater pump assembly side.
      3. Keep the heater pump assembly as far away from the battery as possible.

      OK:
      Pressure is applied to the hose.

  1. Reconnect the heater pump assembly connector.

Text in Illustration 
*1
Component without harness connected
(Heater pump assembly)


NG
REPLACE HEATER PUMP ASSEMBLY (Click here)
OK

REPLACE COMBUSTION HEATER ASSEMBLY (Click here)