Scan Tool Data Definitions

WARNING: This page is about a different car, the 2002 Pontiac Montana, 2002 Oldsmobile Silhouette, and 2002 Chevrolet Venture. However, it is still accessible from the selected car via links, so may be relevant.

Commanded Fan 1/Commanded Fan 2: Scan tool displays ON or OFF. Represents the powertrain control module (PCM) commanded state of the fan 1 (low Speed) and fan 2 (high speed) control circuits.

ECT: The scan tool displays -40-151 °C (-40-304°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 (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: The scan tool displays OK or Fault. This parameter indicates the state of the driver circuit for this device.

FC Relay 2 and 3: The scan tool displays OK or Fault. This parameter indicates the state of the driver circuit for this device.

Fig 1: Diagnostic Trouble Code (DTC) List

Courtesy of GENERAL MOTORS CORP.