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.
Scan Tool Data Definitions
- Aux. Coolant Pump Relay
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This parameter indicates when the auxiliary engine coolant pump is on or off.
- Coolant Level Switch - Range: Low/OK
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This parameter indicates when the engine coolant level is low. The scan tool displays Low when the PCM detects the engine coolant level switch is open.
- Displayed Coolant Temperature - Range: 32-127° C (89-260° F)
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This data is the coolant temperature the Instrument Cluster is attempting to display on the coolant temperature gauge. This data may differ from the monitored coolant temperature for a period of time due to filtering. The data may also differ from the monitored coolant temperature when coolant temperature is not in the range of 71-127° C (160-260° F) since the display is limited to these values. If a Class 2 communication failure occurs, this data will be at the minimum value of 32° C (89° F).
- ECT - Range: -40° C to +150° C (-40° F to +302° F)
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The PCM applies 5.0 volts to the ECT sensor circuit. The sensor is a thermistor which changes internal resistance as the engine temperature changes. When the sensor is cold (internal resistance high), the PCM senses a high signal voltage and interprets the voltage 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.
- Monitored Coolant Temperature - Range: 40-215° C (40-419° F)
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This data is the clusters measurement of the engine coolant temperature as provided by the PCM on the Class 2 serial data line.
- SGCM Fan Speed
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This parameter indicates the commanded SGCM coolant fan speed. The scan tool displays 0-100%.
- SGCM Pump Status
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This parameter indicates the commanded SGCM coolant pump state. The scan tool displays On and Off.
- SGCM Temperature
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This parameter indicates the average coolant temperature of the SGCM coolant. The scan tool displays -40° C to +150° C.
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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.