COMBUSTION TYPE POWER HEATER SYSTEM, Diagnostic DTC:050, 052, 054, 056

DTC Code DTC Name
050 Detection of No Ignition
052 Safety Time Exceeded
054 High Setting of Flame Cutout
056 Low Setting of Flame Cutout

DESCRIPTION

DTC Code DTC Detection Condition Trouble Area
050 The ECU is locked as a result of 10 successive heater ignition failures.

  • Intake air duct

  • Exhaust air duct

  • Fuel pump filter

  • Heater pump assembly

  • Heater assembly
052 A heater ignition failure is detected.

  • Intake air duct

  • Exhaust air duct

  • Fuel pump filter

  • Heater pump assembly

  • Heater assembly
054 Combustion ends abnormally (High output operation).

  • Intake air duct

  • Exhaust air duct

  • Fuel pump filter

  • Heater pump assembly

  • Heater assembly
056 Combustion ends abnormally (Low output operation).

  • Intake air duct

  • Exhaust air duct

  • Fuel pump filter

  • Heater pump assembly

  • Heater assembly

CAUTION / NOTICE / HINT

Tech Tips


  • Clear the DTCs by pressing the memory clear buttons on the DTC tester to unlock the ECU.

  • Before performing the following procedure, attempt to restart the heater assembly. If the heater assembly is successfully started, confirm that neither DTC 054 nor DTC 056 is output. If neither DTC 054 nor 056 is output, finish troubleshooting because it can be concluded that the system has returned to normal operation.

PROCEDURE


  1. INSPECT INTAKE AIR DUCT


    1. Inspect the intake air duct.

      Result
      Result Proceed to
      There is no problem with the intake air duct A
      The intake air duct is clogged, or other problems are found B

    B

    CLEAN OR REPLACE INTAKE AIR DUCT

    A

  2. INSPECT EXHAUST AIR DUCT


    1. Inspect the exhaust air duct.

      Result
      Result Proceed to
      There is no problem with the exhaust air duct A
      The exhaust air duct is clogged, or other problems are found B

    B

    CLEAN OR REPLACE EXHAUST AIR DUCT

    A

  3. INSPECT HEATER PUMP ASSEMBLY


    1. A01XIICE13

      Remove the heater pump assembly Click here.

    2. 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

    3. 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.

        Note

        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 Click here

    A

  4. CHECK FUEL PUMP FILTER


    1. Replace the fuel pump filter with a new one and check that the condition returns to normal.

      OK
      The heater is ignited normally and starts operating.

    OK

    END (FUEL PUMP FILTER IS DEFECTIVE)

    NG

    REPLACE HEATER ASSEMBLY Click here