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Home >> Toyota >> 2004 >> Highlander Limited, FWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 891 (Engine Control System (Diagnostic Codes & Symptom Tests)) >> DTC/Circuit Diagnosis >> DTC P0117, P0118: ECT Sensor >> Diagnosis Procedure

Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK GROUND CONNECTIONS 
    1. Turn ignition switch OFF.
    2. Loosen and retighten three ground screws on the body.

      Refer to "GROUND INSPECTION ".

      Fig 1: Identifying Body Ground Screws
      G08690479Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO 2.

      NG: Repair or replace ground connections.

  2. CHECK ECT SENSOR POWER SUPPLY CIRCUIT 
    1. Disconnect engine coolant temperature (ECT) sensor (1) harness connector.
      Fig 2: Identifying Engine Coolant Temperature Sensor And Intake Manifold
      G08690480Courtesy of NISSAN NORTH AMERICA, INC.
    2. Turn ignition switch ON.
    3. Check voltage between ECT sensor (1) terminal 1 and ground with CONSULT or tester.

      Voltage: Approximately 5 V 

      Fig 3: Checking Voltage Between ECT Sensor Terminal 1 And Ground
      G08690481Courtesy of NISSAN NORTH AMERICA, INC.

      OK or NG 

      OK: GO TO  4.

      NG: GO TO 3.

  3. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connector F26, F201
    • Harness for open or short between ECM and engine coolant temperature sensor

      : Repair open circuit or short to ground or short to power in harness or connectors.

  4. CHECK ECT SENSOR GROUND CIRCUIT FOR OPEN AND SHORT 
    1. Turn ignition switch OFF.
    2. Disconnect ECM harness connector.
    3. Check harness continuity between ECT sensor terminal 2 and ECM terminal 67.

      Refer to WIRING DIAGRAM .

      Continuity should exist. 

    4. Also check harness for short to ground and short to power.

      OK or NG 

      OK: GO TO  6.

      NG: GO TO 5.

  5. DETECT MALFUNCTIONING PART 

    Check the following.

    • Harness connector F26, F201
    • Harness for open and short between ECT sensor and ECM

      : Repair open circuit or short to ground or short to power in harness or connectors.

  6. CHECK ENGINE COOLANT TEMPERATURE SENSOR 

    Refer to "COMPONENT INSPECTION ".

    OK or NG 

    OK: GO TO 7.

    NG: Replace engine coolant temperature sensor. Refer to "EXPLODED VIEW ".

  7. CHECK INTERMITTENT INCIDENT 

    Refer to "HOW TO CHECK TERMINAL " and "INTERMITTENT INCIDENT ".

    INSPECTION END 

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