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DTC P0118 ENGINE COOLANT TEMPERATURE CIRCUIT HIGH INPUT

DTC P0118 ENGINE COOLANT TEMPERATURE CIRCUIT HIGH INPUT

OUTLINE OF DIAGNOSIS

Detect the open or short circuit of engine coolant temperature sensor. Judge NG when out of the standard value.

COMPONENT DESCRIPTION


(1)

Connector

(A)

Resistance value (kΩ)

(2)

Thermistor element

(B)

Temperature °C (°F)



ENABLE CONDITION

Secondary Parameters Enable Conditions
None



GENERAL DRIVING CYCLE

Always perform the diagnosis continuously.

DIAGNOSTIC METHOD

Judge NG when the continuous time of completing the malfunction criteria below becomes more than 0.5 seconds. Judge OK and clear the NG when the malfunction criteria below are not completed.

Judgment Value

Malfunction Criteria Threshold Value
Output voltage

≥ 4.716 V



Time Needed for Diagnosis: 0.5 seconds

Malfunction Indicator Light Illumination: Illuminates as soon as the malfunction occurs.

DTC CLEAR CONDITION


When the OK idling cycle was completed 40 times in a row

When “Clear Memory” was performed


MALFUNCTION INDICATOR LIGHT CLEAR CONDITION


When the OK driving cycle was completed 3 times in a row

When “Clear Memory” was performed


FAIL SAFE


Engine coolant temperature process: Fix the engine coolant temperature at 70°C (158°F).

ISC feedback: Calculate the target engine speed setting the engine coolant temperature to 70°C (158°F).

ISC learning: Not allowed to learn.

Heavy fuel judgment control: Not allowed to carry out the heavy judgment.

Air conditioner control: Not allowed to turn the air conditioner to ON.

Radiator fan control: Both main and sub fan turn to ON.

Increase compensation factor at high coolant temperature: Increase normally occurs with high temperature and other conditions; however, occurs with other conditions except coolant temperature condition.

Tumble generator valve control: Open the tumble generator valve.


ECM OPERATING AT DTC SETTING

Memorize the freeze frame data. (For test mode $02)