Engine-Codes
 
OBDII Code List
 
P0118 1998 HONDA CIVIC

P0118 1998 HONDA CIVIC - Engine Coolant Temperature Sensor 1 Circuit High Voltage

Repair Importance Level: 3/3
Repair Difficulty Level: 2/3  What does this mean?

Possible causes

  • Low Engine Coolant Level
  • Faulty Engine Coolant Temperature (ECT) sensor
  • Faulty Engine Coolant Thermostat
  • Engine Coolant Temperature (ECT) sensor harness is open or shorted
  • Engine Coolant Temperature (ECT) sensor electrical circuit poor connection
  • Tech notes

    First check to see if there are any coolant leaks and if the thermostat is opening, if problem is still there replace the coolant temperature sensor.

    When is the code detected?

    An excessively high voltage from the sensor is sent to ECM.

    Possible symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)
  • P0118 1998 Honda Civic Description

    The Engine Coolant Temperature (ECT) sensor is used to detect the engine coolant temperature. The sensor modifies a voltage signal from the Engine Control Module (ECM). The modified signal returns to the ECM as the engine coolant temperature input. The sensor uses a thermistor which is sensitive to the change in temperature. The electrical resistance of the thermistor decreases as temperature increases.
    OBDII Code P0118 1998 Honda Civic - Engine Coolant Temperature Sensor 1 Circuit High Voltage - Engine-Codes.com

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