METER / GAUGE SYSTEM Engine Coolant Temperature Gauge Malfunction

DESCRIPTION

In this circuit, the meter CPU receives engine coolant temperature signals from the ECM. The meter CPU displays engine coolant temperature that is calculated based on the data received from the ECM.

WIRING DIAGRAM

A01DYP6E06
A01DYP6E07
A01DYP6E08
A01DYP6E09
A01DYP6E10

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC


    • *1: for 1KD-FTV, 2KD-FTV, 5L-E

    • *2: for 1TR-FE, 2TR-FE, 1GR-FE


    1. Check for DTCs of the ECD system*1 or SFI system*2.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output (for 1KD-FTV, 2KD-FTV, 5L-E) B
      DTC is output (for 1TR-FE, 2TR-FE, 1GR-FE) C

    B

    GO TO ECD SYSTEM

    C

    GO TO SFI SYSTEM

    A

  2. CHECK HARNESS AND CONNECTOR (COMBINATION METER ASSEMBLY - ECM)


    • *1: for 1KD-FTV, 2KD-FTV

    • *2: for 2TR-FE

    • *3: for 1GR-FE

    • *4: for 5L-E


    1. Disconnect the C25 combination meter assembly connector.

    2. Disconnect the E5*1 or E10*2 or E13*3 or E20*4 ECM connector.

    3. Measure the resistance of the wire harness side connectors.

      Standard Resistance
      for 1KD-FTV w/o DPF, 2KD-FTV w/o DPF
      Tester Connection Condition Specified Condition
      C25-4 (TEMP) - E5-2 (THWO) Always Below 1 Ω
      C25-4 (TEMP) or E5-2 (THWO) - Body ground Always 10 kΩ or higher
      for 1KD-FTV w/ DPF, 2KD-FTV w/ DPF
      Tester Connection Condition Specified Condition
      C25-4 (TEMP) - E30-16 (THWO) Always Below 1 Ω
      C25-4 (TEMP) or E30-16 (THWO) - Body ground Always 10 kΩ or higher
      for 1TR-FE, 2TR-FE
      Tester Connection Condition Specified Condition
      C25-4 (TEMP) - E10-14 (THWO) Always Below 1 Ω
      C25-4 (TEMP) or E10-14 (THWO) - Body ground Always 10 kΩ or higher
      for 1GR-FE
      Tester Connection Condition Specified Condition
      C25-4 (TEMP) - E13-14 (THWO) Always Below 1 Ω
      C25-4 (TEMP) or E13-14 (THWO) - Body ground Always 10 kΩ or higher
      for 5L-E
      Tester Connection Condition Specified Condition
      C25-4 (TEMP) - E20-8 (THWO) Always Below 1 Ω
      C25-4 (TEMP) or E20-8 (THWO) - Body ground Always 10 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. REPLACE COMBINATION METER ASSEMBLY


    1. Replace the combination meter assembly with a new or normally functioning one Click here.

      OK
      The operation of the engine coolant temperature gauge returns to normal.

    NG

    REPLACE ECM

    OK

    END (COMBINATION METER ASSEMBLY IS DEFECTIVE)