Sprinter 2500 L5-2.7L DSL Turbo (2003)
Engine - Coolant Temperature Sensor/Switch: Description and Operation
ENGINE COOLANT TEMP SENSOR
DESCRIPTION
The ECM determines the operating temperature of the engine by using the signal from the coolant temperature sensor. The coolant temperature sensor
has a negative temperature coefficient (NTC) resistor contained in the plastic housing. NTC means; the higher the temperature, then the lower the
resistance. The ECM also uses the coolant temperature sensor signal to calculate glow plug relay triggering. If the coolant temperature sensor fails
during operation, the ECM will switch on the cooling fan to prevent engine overheating (A/C models only).
