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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Gauges & Instrument Panels >> Meter / Gauge System (Except 12.3 Inch Display) - Diagnostic Codes & Symptom Tests (1 Of 2) >> METER / GAUGE SYSTEM (except 12.3 Inch Display) >> DTC B1503-09: Exhaust Heat Management Component Failure [12/2019 - ] >> Procedure

DTC B1503-09: Exhaust Heat Management Component Failure [12/2019 - ]: Procedure

  1. READ VALUE USING TECHSTREAM (COOLANT TEMPERATURE) 
    1. Put the engine in inspection mode (maintenance mode).

      Refer to INSPECTION MODE PROCEDURE [12/2019 - ]

    2. Read the Data List according to the display on the Techstream.

      Body Electrical > Combination Meter > Data List 

      Tester Display Measurement Item Range Normal Condition Diagnostic Note
      Coolant Temperature Engine coolant temperature Min.: 0.0°C, Max.: 127.1°C or Unset 75 to 100°C: After warming up engine -

      Body Electrical > Combination Meter > Data List 

      Tester Display
      Coolant Temperature

      OK

      Engine coolant temperature displayed on the Techstream is 75 to 100°C after the engine is warmed.

      NOTE:

      If the engine coolant temperature exceeds 100°C, the cooling system is malfunctioning. Stop the engine immediately.

      HINT: 

      The coolant temperature value in this inspection is the data sent from the engine coolant temperature sensor for the SFI system.

      Result

      Proceed to
      OK
      NG

    Result: 

    NG 

    GO TO EXHAUST HEAT RECIRCULATION SYSTEM. Refer to  PROBLEM SYMPTOMS TABLE [12/2019 - ] 

    Result: 

    OK 

    See step  2

  2. CHECK FOR DTC (METER / GAUGE SYSTEM) 
    GTY857462Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    *a Front view of wire harness connector
    (to Temperature Switch)
    1. Turn the ignition switch off.
    2. Disconnect the Q2 temperature switch connector.
    3. Connect SST to terminal Q2-2 (TWS2) and body ground.
      • SST: 09843-18040 
    4. Turn the ignition switch to ON.
    5. Clear the DTCs.

      Body Electrical > Combination Meter > Clear DTCs 

    6. Check for DTCs.

      Body Electrical > Combination Meter > Trouble Codes 

      Result

      Result Proceed to
      DTC B1503-09 is not output A
      DTC B1503-09 is output B

    Result: 

    A 

    REPLACE TEMPERATURE SWITCH. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    B 

    See step  3

  3. CHECK HARNESS AND CONNECTOR (TEMPERATURE SWITCH - COMBINATION METER ASSEMBLY) 
    1. Disconnect the SST.
    2. Disconnect the H21 combination meter assembly connector.
    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance

      Tester Connection Condition Specified Condition
      Q2-2 (TWS2) - H21-38 (TWS2) Always Below 1 Ω
      Q2-1 (GND) - Body ground Always Below 1 Ω

      Result

      Proceed to
      OK
      NG

    Result: 

    OK 

    REPLACE COMBINATION METER ASSEMBLY. Refer to  REMOVAL [12/2019 - ] 

    Result: 

    NG 

    REPAIR OR REPLACE HARNESS OR CONNECTOR 

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