72 Engine Cooling System - Temperature Low

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Description

The coolant temperature sensor (CTS) is a thermistor located in a coolant passage on the engine. When coolant temperature is cold the sensor has a high resistance, as temperature increases the resistance of the sensor decrease. The PCM provides a five volt signal to the coolant sensor, which is also connect to PCM ground. The PCM reads the voltage drop on the signal line to determine coolant temperature.

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Information Flag Parameters

Information Flag 72 will set if:

  • The coolant temperature is below 0°C (32°F) after the engine has been running for more than five minutes.

DIAGNOSTIC AIDS

  • Information Flag 72 indicates lower than normal coolant temperatures and does not indicate a faulty CTS subsystem.

Possible causes of low coolant temperature

  • Thermostat stuck open
  • Cooling fan always on

NOTICE: Information flags should be used for diagnostic purposes only. They do not necessarily indicate component malfunction/failure.

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