Dtc P0116 Engine Coolant Temperature Circuit Range / Performance


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


DESCRIPTION

Refer to DTC P0115 (LandCruiser RM000000PF50ZYX_01.html).

DTC No.
DTC Detection Condition
Trouble Area
P0116
When either of the following conditions is met (2 trip detection logic):
  1. When a cold engine is started and the engine is warmed up, the engine coolant temperature sensor value does not change.
  2. After the warmed up engine is stopped and then the next cold engine start is performed, the engine coolant temperature sensor value does not change.
  1. Water inlet with thermostat
  2. Engine coolant temperature sensor
The engine coolant temperature 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 engine coolant temperature remains within 3°C (5.4°F) of the initial engine coolant temperature.

MONITOR DESCRIPTION

  1. Engine coolant temperature sensor cold start monitor
    When a cold engine start is performed and then the engine is warmed up, if the engine coolant temperature sensor value does not change, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is stored.
  1. Engine coolant temperature sensor soak monitor
    If the engine coolant temperature sensor value does not change after the warmed up engine is stopped and then the next cold engine start is performed, it is determined that a malfunction has occurred. If this is detected in 2 consecutive driving cycles, the MIL is illuminated and a DTC is stored.
  1. Engine coolant temperature sensor high side stuck monitor
    The engine coolant temperature monitors the sensor voltage and uses this value to calculate the engine coolant temperature. If the sensor voltage output deviates from the normal operating range, the ECM interprets this deviation as a malfunction in the engine coolant temperature sensor and stores the DTC.

INSPECTION PROCEDURE

HINT:
  1. If DTC P0115, P0117 or P0118 is stored simultaneously with DTC P0116, the engine coolant temperature sensor may have an open or short circuit. Troubleshoot those DTCs first.
  2. Read freeze frame data using the GTS. 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 GTS to the DLC3.

  1. Turn the engine switch on (IG).

  1. Turn the GTS on.

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

  1. Read the DTCs.


Result
Result
Proceed to
P0116
A
P0116 and other DTCs
B


B
GO TO DTC CHART (LandCruiser RM000002ZSO015X.html)
A


2.INSPECT WATER INLET WITH THERMOSTAT

  1. Remove the water inlet with thermostat (LandCruiser RM000002BG803TX.html).

  1. Measure the valve opening temperature of the thermostat.

    Standard value:
    80 to 84°C (176 to 183°F)
    HINT:
    1. In addition to the above check, confirm that the valve is completely closed when the temperature is below the standard.
    for Automatic Transmission
    1. Perform "Inspection After Repair" after replacing the engine coolant temperature sensor (LandCruiser RM000004NJC03SX.html).


NG
REPLACE WATER INLET WITH THERMOSTAT (LandCruiser RM000002BG803TX.html)
OK

REPLACE ENGINE COOLANT TEMPERATURE SENSOR (LandCruiser RM000000PWT056X.html)