Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET2003MONTE CARLO V6-3.8L VIN KREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTCOOLING SYSTEMTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL DATA DEFINITIONS
2003 Chevrolet Monte Carlo V6-3.8L VIN K
Scan Tool Data Definitions
2003 Chevrolet Monte Carlo V6-3.8L VIN KSECTION Scan Tool Data Definitions
Scan Tool Data Definitions
ECT Sensor: The scan tool displays -40°C to +151°C (-40°F to +304°F). The Engine Coolant Temperature (ECT) sensor is mounted in the coolant stream. The PCM applies 5 volts to the ECT sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold the PCM monitors a high signal voltage and interprets it as a cold engine. As the sensor warms the voltage signal decreases and the PCM interprets the lower voltage as a warm engine.
FC Relay 1 Command: The scan tool displays On or Off. The PCM is commanding Fan Control relay 1 On when the scan tool indicates On. When the PCM commands the Fan Control relay 1 On, both fans are enabled on low speed.
FC Relay 2 and 3 Command: The scan tool displays On or Off. The PCM is commanding all 3 fan control relays on when the scan tool indicates On. When all fan control relays are activated, both cooling fans are enabled on high speed.
FC Relay 1 Circuit Status: The scan tool displays OK, Fault, or Invalid State. This parameter indicates the state of the driver circuit for this device.
FC Relay 2 and 3 Circuit Status: The scan tool displays OK, Fault, or Invalid State. This parameter indicates the state of the driver circuit for this device.
ECT Sensor: The scan tool displays -40°C to +151°C (-40°F to +304°F). The Engine Coolant Temperature (ECT) sensor is mounted in the coolant stream. The PCM applies 5 volts to the ECT sensor circuit. The sensor is a thermistor which changes internal resistance as temperature changes. When the sensor is cold the PCM monitors a high signal voltage and interprets it as a cold engine. As the sensor warms the voltage signal decreases and the PCM interprets the lower voltage as a warm engine.
FC Relay 1 Command: The scan tool displays On or Off. The PCM is commanding Fan Control relay 1 On when the scan tool indicates On. When the PCM commands the Fan Control relay 1 On, both fans are enabled on low speed.
FC Relay 2 and 3 Command: The scan tool displays On or Off. The PCM is commanding all 3 fan control relays on when the scan tool indicates On. When all fan control relays are activated, both cooling fans are enabled on high speed.
FC Relay 1 Circuit Status: The scan tool displays OK, Fault, or Invalid State. This parameter indicates the state of the driver circuit for this device.
FC Relay 2 and 3 Circuit Status: The scan tool displays OK, Fault, or Invalid State. This parameter indicates the state of the driver circuit for this device.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.