DTC    052    Safety Time Exceeded

for Preparation Click here


DESCRIPTION


DTC No.
DTC Detection Condition
Trouble Area
052
A heater ignition failure is detected.
  1. Air duct
  2. Exhaust pipe
  3. Heater pump assembly
  4. Fuel pump filter (heater pump assembly)
  5. Power heater ECU (combustion heater assembly)

INSPECTION PROCEDURE

CAUTION:
  1. In some cases, the combustion heater, air duct and exhaust pipe are extremely hot. When performing the inspection, wear protective gloves and do not touch these parts with bare hands.
  2. When performing the inspection, wear a face mask to prevent direct inhalation of exhaust gas.

1.INSPECT FUEL PIPE

  1. Check that there is no fuel leakage between heater pump assembly and combustion heater assembly.


Result 
Result
Proceed to
There is no problem in the fuel pipe.
A
There is problem in the fuel pipe.
B


B
REPAIR OR REPLACE FUEL PIPE (Click here)
A


2.INSPECT AIR DUCT

  1. Perform the following checks for the air duct.

    1. The air duct is not clogged with foreign matter.
    2. Air intake is normal.
    3. The air duct is correctly installed to the combustion heater assembly.
    4. There are no defects that would cause air to leak from the intake air duct.

    Result 
    Result
    		Proceed to
    There is no problem with the air duct.
    		A
    There is problem with the air duct.
    		B



B
CLEAN OR REPLACE AIR DUCT (Click here)
A


3.INSPECT EXHAUST PIPE

  1. Perform the following checks for the exhaust pipe.

    1. The exhaust pipe is not clogged with foreign matter.
    2. Air exhaust is normal.
    3. The exhaust pipe is correctly installed to the combustion heater assembly.
    4. There are no defects that would cause air to leak from the exhaust pipe.

    Result 
    Result
    		Proceed to
    There is no problem with the exhaust pipe.
    		A
    There is problem with the exhaust pipe.
    (exhaust pipe)
    		B
    There is problem with the exhaust pipe.
    (exhaust pipe sub-assembly)
    		C



B
CLEAN OR REPLACE EXHAUST PIPE (Click here)

C
CLEAN OR REPLACE EXHAUST PIPE SUB-ASSEMBLY (Click here)
A


4.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


5.REPLACE FUEL PUMP FILTER (HEATER PUMP ASSEMBLY)

  1. Replace the fuel pump filter (heater pump assembly) with a new one (Click here).

  1. Check that the condition returns to normal.

    OK:
    The combustion heater assembly is ignited normally and it starts operating.



NG
REPLACE COMBUSTION HEATER ASSEMBLY (Click here)
OK

END (FUEL PUMP FILTER IS FAULTY)