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 MANUALSCADILLAC2002ELDORADO V8-4.6L VIN YREPAIR AND DIAGNOSISENGINE, COOLING AND EXHAUSTCOOLING SYSTEMTESTING AND INSPECTIONSCAN TOOL TESTING AND PROCEDURESSCAN TOOL DATA DEFINITIONS
2002 Cadillac Eldorado V8-4.6L VIN Y
Scan Tool Data Definitions
2002 Cadillac Eldorado V8-4.6L VIN YSECTION Scan Tool Data Definitions
Scan Tool Data Definitions
ECT: The scan tool displays -40°C to +150°C (-40°F to +302°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, internal resistance decreases, 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. This parameter indicates the PCM commanded state of the low speed cooling fans.
FC Relay 2 and S/P Command: The scan tool displays ON or OFF. This parameter indicates the PCM commanded state of the high speed cooling fans.
Low Coolant Level: Displays On or OFF. The status of the discrete engine coolant level switch signal. The instrument cluster uses this input to determine display of the CHECK COOLANT LEVEL message on the DIC.
ECT: The scan tool displays -40°C to +150°C (-40°F to +302°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, internal resistance decreases, 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. This parameter indicates the PCM commanded state of the low speed cooling fans.
FC Relay 2 and S/P Command: The scan tool displays ON or OFF. This parameter indicates the PCM commanded state of the high speed cooling fans.
Low Coolant Level: Displays On or OFF. The status of the discrete engine coolant level switch signal. The instrument cluster uses this input to determine display of the CHECK COOLANT LEVEL message on the DIC.
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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.