Pic. 2.242. Wiring diagram for coolant temperature sensor with ECU
Conditions for storing fault codes
The ECU memorizes code P0116 and turns on the engine control system malfunction indicator lamp if the actual sensor performance for 0.2 s in two driving cycles is more than 20°C below the ECU mode curve (determined by the amount of fuel supplied, ambient temperature and engine running time). This code indicates an unusual coolant temperature reading from the coolant temperature sensor or the ECU. The ECU sets code P0117 and turns on the engine management system malfunction indicator lamp if the coolant temperature sensor outputs a temperature value below -45°C for 0.2 s in two driving cycles.
The ECU sets code P0118 and turns on the engine management system malfunction indicator lamp if the coolant temperature sensor outputs a temperature value above 140°C for 0.2 seconds in two driving cycles.
Note. The DTOZH resistance varies with temperature as follows:
- 5900 Ohm at 0°C;
- 2500 Ohm at 20°C;
- 300 Ohm at 80°C.
Examination
Remove the coolant temperature sensor from the intake manifold.
Pic. 2.243. Checking the resistance of the coolant temperature sensor
Check the resistance of the sensor by immersing its sensing element in hot water (pic. 2.243).
If the resistance deviates from the norm, replace the sensor.
Installation
Apply LOCTITE 962T or equivalent to the threads of the sensor.
Install the coolant temperature sensor and tighten to the specified torque.
The moment of an inhaling of the gauge of temperature of a cooling liquid: 15–20 Н·м.