P0118 (U5/Low Emissions)

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




ENABLE CONDITION

GENERAL DRIVING CYCLE
Always perform the diagnosis continuously.

DIAGNOSTIC METHOD




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

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)