Hi, If you have truble code check/service engine soon light on,then go to your local Autozone part store for a free scan. If not,i'm going to start with haveing you check the cooling fan relay,this can be found in the power distribution box,this can be found in the engine compartment.I would change places with another relay with the same number on it. If this takes care of it,buy a new relay and it was an easy fix. If not here's tests you will have to do as long as you have a digital volt meter.
Operation
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 compares the ECT, Intake Air Temperature (IAT), and Ambient Air Temperature (AAT) under cold start conditions. Following a start to run delay time, the sensor values are compared. If the one sensor value is not within a specified range of the other two sensors, the value is determined to be irrational
2.7L, 3.5L & 5.7L Engines
- Turn the ignition off.
- Disconnect the Engine Coolant Temperature Sensor (ECT) harness connector.
- Turn the ignition on.
- With a scan tool, read the ECT sensor voltage.
- The sensor voltage should be approximately 5.0 volts (plus or minus .1 volt) with the connector disconnected.
- Turn the ignition off.
- Connect a jumper wire between the (K2) Engine Coolant Temperature Sensor (ECT) signal circuit and the (K900) sensor ground circuit in the ECT harness connector.
- Turn the ignition on.
- With a scan tool, read the voltage.
- The sensor voltage should be approximately 0.0 volts (plus or minus .1 volt) with the jumper wire in place.
- If voltage is present as stated suspect faulty ECT sensor.
I hope this helps,Thank You for using fixya, iluv2fish..... Ray.......
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