AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System), Diagnostic DTC:14

DTC Code DTC Name
14 Engine Coolant Temperature Communication Circuit

DESCRIPTION

The engine coolant temperature sensor connected to the ECM detects the engine coolant temperature, which is used for warm up control when the engine is cold. The engine coolant temperature sensor sends a signal to the air conditioning amplifier assembly via the ECM.

DTC Code DTC Detection Condition Trouble Area
14 An open or short in engine coolant temperature communication circuit

  • SFI system

  • Air conditioning amplifier assembly

  • Harness or connector

WIRING DIAGRAM

A01J6I9E01

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK FOR DTC (ENGINE CONTROL SYSTEM)


    1. Clear the DTCs.

    2. Check the DTC.

      Result
      Result Proceed to
      DTC (P0115, P0117 or P0118) is not output. A
      DTC (P0115, P0117 or P0118) is output. (for 2TR-FE) B
      DTC (P0115, P0117 or P0118) is output. (for 1GR-FE) C

    B

    GO TO SFI SYSTEM Click here

    C

    GO TO SFI SYSTEM Click here

    A

  2. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - ECM)


    1. Disconnect the A38 air conditioning amplifier assembly connector.

    2. Disconnect the E9*1 or E13*2 ECM connector.


      • *1: for 2TR-FE

      • *2: for 1GR-FE

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

      Standard Resistance
      for 2TR-FE
      Tester Connection Condition Specified Condition
      A38-8 (TW) - E9-14 (THWO) Always Below 1 Ω
      A38-8 (TW) - Body ground Always 10 kΩ or higher
      for 1GR-FE
      Tester Connection Condition Specified Condition
      A38-8 (TW) - E13-9 (THWO) Always Below 1 Ω
      A38-8 (TW) - Body ground Always 10 kΩ or higher
      Result
      Result Proceed to
      OK (When troubleshooting according to problem symptoms table.) A
      OK (When troubleshooting according to DTC.) B
      NG C

    B

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    A

    PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE Click here