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HOMESERVICE MANUALSPONTIAC2008GRAND PRIX BASEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 58 (ENGINE COOLING)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DATA DEFINITIONS
2008 Pontiac Grand Prix Base

Scan Tool Data Definitions

2008 Pontiac Grand Prix BaseSECTION Scan Tool Data Definitions
WARNING: This page is about a different car, the 2007 Hummer H2. However, it is still accessible from the selected car via links, so may be relevant.
ECT - Range: -40°C to +150°C (-40°F to +302°F)

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.

Displayed Coolant Temperature - Range: 32-127°C (89-260°F)

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).

Monitored Coolant Temperature - Range: 40-215°C (40-419°F)

This data is the clusters measurement of the engine coolant temperature as provided by the PCM on the class 2 serial data line.

RENDER: 1.0x

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Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
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  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
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