DTC    051    Cold Blow Time Exceeded

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DESCRIPTION


DTC No.
DTC Detection Condition
Trouble Area
051
After the combustion heater is turned on, the temperature of the flame sensor is 90°C (194°F) or more for 600 seconds or more before the heater ignites.
Power heater ECU (combustion heater assembly)

INSPECTION PROCEDURE

HINT:
Before performing the following inspections, attempt to restart the combustion heater. If the combustion heater is successfully started, confirm that DTC 051 is not output. If DTC 051 is not output, stop troubleshooting because it can be concluded that the system has returned to normal operation.

1.INSPECT EXHAUST PIPE

  1. Check that hot exhaust gas is coming out of the exhaust pipe.

    CAUTION:
    1. The exhaust pipe and muffler are extremely hot. 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.


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


2.REPLACE COMBUSTION HEATER ASSEMBLY

  1. Replace the combustion heater assembly (Click here).


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END (COMBUSTION HEATER ASSEMBLY IS FAULTY)