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 (No. 3 meter circuit plate) detects a malfunction in the water temperature sensor that is connected to the combination meter assembly (No. 3 meter circuit plate) via a direct line.

DTC No. DTC Detection Condition Trouble Area
B1503

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


  1. Coolant temperature sensor operation malfunction

  2. Coolant temperature sensor circuit open or short

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

  • Harness or connector

  • Water temperature sensor

  • Combination meter assembly (No. 3 meter circuit plate)

Tech Tips

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

WIRING DIAGRAM

A01JAIYE02

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: 80 to 100°C (176 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 80 to 100°C (176 to 212°F) after warming up

    NG

    GO TO EXHAUST HEAT RECIRCULATION SYSTEM Click here

    OK

  2. CHECK HARNESS AND CONNECTOR (NO. 3 METER CIRCUIT PLATE - WATER TEMPERATURE SENSOR)


    1. Disconnect the G2 connector.

    2. Disconnect the L27 connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G2-2 (TWS3) - L27-16 (TWS3) Always Below 1 Ω
      G2-1 (E2) - L27-9 (E2) Always Below 1 Ω
      G2-2 (TWS3) or L27-16 (TWS3) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. WATER TEMPERATURE SENSOR


    1. A01JB7LE01

      Remove the water 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 WATER TEMPERATURE SENSOR Click here

    OK

    REPLACE COMBINATION METER ASSEMBLY (NO. 3 METER CIRCUIT PLATE)