Hyundai Santa Fe: Engine Control System / Engine Coolant Temperature Sensor (ECTS). Description and operation
Engine Coolant Temperature Sensor (ECTS) is located in the engine coolant passage
of the cylinder head for detecting the engine coolant temperature. The ECTS
uses a thermistor whose resistance changes with the temperature.
The electrical resistance of the ECTS decreases as the temperature increases,
and increases as the temperature decreases. The reference +5V is supplied to
the ECTS via a resistor in the ECM. That is, the resistor in the ECM and the
thermistor in the ECTS are connected in series. When the resistance value of
the thermistor in the ECTS changes according to the engine coolant temperature,
the output voltage also changes.
During cold engine operation, the ECM increases the fuel injection duration
and controls the ignition timing using the information of engine coolant temperature
to avoid engine stalling and improve drivability.

Inspection
1.
Turn the ignition switch OFF.
2.
Disconnect the IATS connector.
3...
Specification
Temperature [°C (°F)]
Resistance (kΩ)
-40 (-40)
41.74 - 54.54
-30 (-22)
23...
Other information:
Troubleshooting
Category
Error symptoms
inspection item
Detailed inspection item
Related parts
Lighting
•
HUD not working
•
Lighting brightness not automatically controlled (no difference
between day and night)
•
Check the lighting control
•
Check the ambient light sensor operation
•
Check the CAN communication
•
Check the lighting control in the cluster USM
→ If working, HUD has no problem...
Description
The Alternator has eight built-in diodes, each rectifying AC current to DC current.
Therefore, DC current appears at alternator "B" terminal.
In addition, the charging voltage of this alternator is regulated by the battery
voltage detection system...
Categories

1. Inside door handle
2. Power window switches
3. Power window lock button/Electronic child safety lock button
4. Side view mirror folding button
5. Side view mirror control switch
6. Central door lock switch
7. Instrument panel illumination control switch
read more