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 MANUALSCHEVROLET2006MONTE CARLO V6-3.9L VIN 1REPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTCOOLING SYSTEMTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL DATA DEFINITIONS
2006 Chevrolet Monte Carlo V6-3.9L VIN 1
Scan Tool Data Definitions
2006 Chevrolet Monte Carlo V6-3.9L VIN 1SECTION Scan Tool Data Definitions
Scan Tool Data Definitions
ECT
The scan tool displays -40 to +151±C (-40 to +304±F). The engine coolant temperature (ECT) sensor is mounted in the coolant stream. The powertrain control module (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 (internal resistance high), the PCM monitors a high signal voltage and interprets it as a cold engine. As the sensor warms and internal resistance decreases, the voltage signal decreases and the PCM interprets the lower voltage as a warm engine.
Engine Coolant Fan LX9/3.5L only
The scan tool displays OFF and ON. When the scan tool displays FC Relay 1 Commanded, the PCM is commanding the cool fan 1 relay ON. When the PCM commands the cool fan 1 relay ON, the left cooling fan is enabled in low speed. When the scan tool displays FC Relay 2 and 3 Commanded, the PCM is commanding the cool fan 1, cool fan 2, and S/P fan relays ON. When the cool fan 1, cool fan 2, and S/P fan relays are ON, the left and right cooling fans are enabled in high speed. When all fan relays are activated, the left and right cooling fans are enabled in high speed.
RENDER: 1.0x
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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.