Ram Truck 1500, 2500 & 3500 (2006-2008)

Operation

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The Engine Coolant Temperature (ECT) sensor is used to sense engine coolant temperature. The sensor protrudes into an engine water jacket.

The ECT sensor is a two-wire Negative Thermal Coefficient (NTC) sensor. Meaning, as engine coolant temperature increases, resistance (voltage) in the sensor decreases. As temperature decreases, resistance (voltage) in the sensor increases.

The PCM uses inputs from the ECT sensor for the following calculations:



For engine coolant temperature gauge operation through CAN Bus communications
 
Injector pulse-width
 
Spark-advance curves
 
ASD relay shut-down times
 
Idle Air Control (IAC) motor key-on steps
 
Pulse-width prime-shot during cranking
 
O2 sensor closed loop times
 
Purge solenoid on/off times
 
Cooling fan control
 
Temperature gauge operation
 
A/C cutoff at high coolant temperatures
 
EGR solenoid on/off times (if equipped)
 
Leak Detection Pump operation (if equipped)
 
Radiator fan relay on/off times (if equipped)
 
Target idle speed
 

 
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