Combustion Type Power Heater System Diagnosis System

Heater & Air Conditioning System. Lexus Is250, Is220D. Gse20 Ale20
Heater. Lexus Is250, Is220D. Gse20 Ale20

  1. DIAGNOSTICS FUNCTION

  1. DESCRIPTION OF DISPLAY AND BUTTONS

  1. FAULTY MEMORY

  1. FAIL-SAFE

Combustion Type Power Heater System -- Diagnosis System


NOTICE:
The cause of failures (such as abnormal voltage, overheat, a short-circuit, breakage of functional components, etc.) and repair methods are shown by connecting the DTC tester and reading DTCs.

DIAGNOSTICS FUNCTION

  1. Connect connector A of the DTC tester to the vehicle wire harness, and connector B of the DTC tester to the power heater connector.

  2. Start the engine.



  3. Pressing the DTC calling button displays a 3-digit number DTC.


    Lexus Is250, Is220D. Gse20 Ale20.Heater.Combustion Type Power Heater System.Combustion Type Power Heater System Diagnosis System


DESCRIPTION OF DISPLAY AND BUTTONS
  1. AF: Current Malfunction (Blinking in the event of a current malfunction)
  2. Diag: DTC (Example: 064 Flame sensor break)
  3. Memory Clear buttons: Clear DTC memory (Press both buttons together for more than 2 seconds.)
  4. > Button: Scrolls up DTC memory (The 5 history codes can be stored.)
  5. < Button: Scrolls down DTC memory (The 5 history codes can be stored.)

FAULTY MEMORY

  1. The ECU is able to store up to 5 DTCs in memory. If it is full, new data is written over F5.


FAIL-SAFE

  1. If the glow plug breaks, the ECU detects the breakage and stops the automatic operation to prevent burner heater operation.