METER / GAUGE SYSTEM, Diagnostic DTC:B1503

DTC Code DTC Name
B1503 Exhaust Heat Management Warning Detected

DESCRIPTION

This DTC is stored when the combination meter assembly detects a malfunction in the engine coolant temperature sensor that is connected to the combination meter assembly via a direct line.

DTC No. DTC Detection Condition Trouble Area
B1503

When IG voltage is 9.5 V or more and the following condition is detected:


  1. Engine coolant temperature sensor operation malfunction

  2. Engine coolant temperature sensor circuit open or short

  3. Engine coolant temperature is 120°C (248°F) or more

  • Harness or connector

  • Engine coolant temperature sensor

  • Combination meter assembly

Tech Tips

This DTC is for the engine coolant temperature sensor which is used to detect the engine engine coolant temperature for the exhaust heat recirculation system, not for the engine coolant temperature sensor which is used for the SFI system.

WIRING DIAGRAM

A003Z40E09

INSPECTION PROCEDURE

PROCEDURE


  1. READ VALUE USING INTELLIGENT TESTER


    1. Set the vehicle in the maintenance mode using the intelligent tester Click here.

    2. Connect the intelligent tester to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the intelligent tester on.

    5. Enter the following menus: Body / Combination Meter / Data List.

    6. Check the values by referring to the table below.

      Combination Meter
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      Coolant Temperature Engine coolant temperature/-40 to 127.5°C (-40 to 261.5°F) After warming up: 75 to 100°C (167 to 212°F)

      • If -40°C (-40°F): Sensor circuit open

      • If 140°C (284°F) or more: Sensor circuit shorted
      OK
      Engine coolant temperature displayed on the intelligent tester is 75 to 100°C (167 to 212°F) after warming up

    NG

    GO TO EXHAUST HEAT RECIRCULATION SYSTEM Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (COMBINATION METER - ENGINE COOLANT TEMPERATURE SENSOR)


    1. Disconnect the F2 connector.

    2. Disconnect the H19 connector.

    3. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      F2-2 (TWS3) - H19-26 (TWS3) Always Below 1 Ω
      F2-1 (E2) - H19-34 (E2) Always Below 1 Ω
      F2-2 (TWS3) or H19-26 (TWS3) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. INSPECT ENGINE COOLANT TEMPERATURE SENSOR


    1. A003XSAE05
      Text in Illustration
      *a

      Component without harness connected

      (Engine Coolant Temperature Sensor)
      *b Resistance kΩ
      *c Temperature °C (°F)

      Remove the engine coolant temperature sensor Click here.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      1 (E2) - 2 (TWS3) Temperature is 20°C (68°F) 2.32 to 2.59 kΩ
      1 (E2) - 2 (TWS3) Temperature is 80°C (176°F) 0.310 to 0.326 kΩ

    NG

    REPLACE ENGINE COOLANT TEMPERATURE SENSOR Click here

    OK

    REPLACE COMBINATION METER ASSEMBLY Click here