DTC P0116 1GR-FE

DESCRIPTION

MONITOR DESCRIPTION

INSPECTION PROCEDURE

CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0116)

INSPECT WATER INLET WITH THERMOSTAT

DTC P0116 Engine Coolant Temperature Circuit Range / Performance Problem

Description DTC

Refer to DTC P0115.

DTC Code DTC Detection Condition Trouble Area
P0116 The Engine Coolant Temperature (ECT) is between 35°C and 60°C (95°F and 140°F) when the engine is started, and conditions (a) and (b) are met (2 trip detection logic):
  1. (a) The vehicle is driven at varying speeds (accelerated and decelerated).
  2. (b) The ECT remains within 3°C (5.4°F) of the initial ECT.
  1. Water inlet with thermostat
  2. Engine Coolant Temperature (ECT) sensor

Monitor description

The ECT sensor is used to monitor the ECT. The ECT sensor has a built-in thermistor with a resistance that varies according to the temperature of the engine coolant. When the ECT is low, the resistance of the thermistor increases. When the temperature is high, the resistance drops. These variations in the resistance are reflected in the output voltage from the ECT sensor.

The ECM monitors the sensor voltage and uses this value to calculate the ECT. If the sensor output voltage deviates from the normal operating range, the ECM interprets this deviation as a malfunction in the ECT sensor and stores the DTC.

Example:

Upon starting the engine, the ECT is between 35°C and 60°C (95°F and 140°F). If after driving for 250 seconds, the ECT remains within 3°C (5.4°F) of the starting temperature, the DTC is stored (2 trip detection logic).

Inspection procedure

HINT:

  1. If any of DTCs P0115, P0117, P0118 or P0125 are stored simultaneously with DTC P0116, the ECT sensor may have an open or a short circuit. Troubleshoot those DTCs first.
  2. Read freeze frame data using the intelligent tester. Freeze frame data records the engine condition when malfunctions are detected. When troubleshooting, freeze frame data can help determine if the vehicle was moving or stationary, if the engine was warmed up or not, if the air fuel ratio was lean or rich, and other data from the time the malfunction occurred.

1.CHECK ANY OTHER DTCS OUTPUT (IN ADDITION TO DTC P0116)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Enter the following menus: Powertrain / Engine and ECT / DTC.

  1. Read the DTC.

Result
Result Proceed to
P0116 A
P0116 and other DTCs B
  B  
GO TO DTC CHART
 
A  
   

2.INSPECT WATER INLET WITH THERMOSTAT

  1. Remove the water inlet with thermostat.

  1. Measure the valve opening temperature of the thermostat.

    Standard value:

    80 to 84°C (176 to 183°F)

    HINT:

    In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.

  NG  
REPLACE WATER INLET WITH THERMOSTAT
 
OK  
   
REPLACE ENGINE COOLANT TEMPERATURE SENSOR