Dtc P0116 Engine Coolant Temperature Circuit Range / Performance Problem

Engine Hybrid System. Land Cruiser. Urj200, 202 Grj200 Vdj200
3Ur-Fe Engine Control. Land Cruiser. Urj200, 202 Grj200 Vdj200

DESCRIPTION

MONITOR DESCRIPTION

INSPECTION PROCEDURE

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

INSPECT WATER INLET SUB-ASSEMBLY WITH THERMOSTAT

DTC P0116 Engine Coolant Temperature Circuit Range / Performance Problem


DESCRIPTION

Refer to DTC P0115 (Click here).

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 sub-assembly with thermostat
  2. 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 is output 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 engine switch on (IG).

  1. Turn the tester on.

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

  1. Read the DTC.

    Result
    Result
    		Proceed to
    P0116 is output
    		A
    P0116 and other DTCs are output
    		B



B
GO TO DTC CHART (Click here)
A


2.INSPECT WATER INLET SUB-ASSEMBLY WITH THERMOSTAT

  1. Remove the water inlet sub-assembly with thermostat (Click here).

  1. Measure the valve opening temperature of the water inlet sub-assembly with thermostat.

    Standard opening temperature:
    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.

  1. Reinstall the water inlet sub-assembly with thermostat (Click here).



NG
REPLACE WATER INLET SUB-ASSEMBLY WITH THERMOSTAT (Click here)
OK

REPLACE ENGINE COOLANT TEMPERATURE SENSOR (Click here)