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HOMESERVICE MANUALSCHEVROLET1998SUBURBAN K2500, 7.4 J, PART TIMEREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 707 (ENGINE COOLING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSCAN TOOL DATA DEFINITIONS
1998 Chevrolet Suburban K2500, 7.4 J, Part Time

Scan Tool Data Definitions

1998 Chevrolet Suburban K2500, 7.4 J, Part TimeSECTION Scan Tool Data Definitions
WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Coolant Temperature:  The scan tool displays -40°C to +151°C (-40°F to +304°F). This data is the coolant temperature the Instrument Cluster is attempting to display on the coolant temperature gage.

ECT:  The scan tool displays -40°C to +151°C (-40°F to +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 Command:  The scan tool displays On or Off. This parameter indicates the state of the driver circuit for this device.

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

Coolant Level Input:  The scan tool displays OK or Low. If the ground circuit opens, the scan tool will display Low.

Fig 1: Diagnostic Trouble Code (DTC) List
G01971731Courtesy of GENERAL MOTORS CORP.
RENDER: 1.0x

NO RELATED

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