23 IAT Circuit - Temperature Out of Range Low

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Description

The air temperature sensor (ATS) is a thermistor located in the air intake passage of the air induction system on the engine. When the sensor is cold it has a high resistance, the resistance decreases as the temperature of the sensor increases. The PCM supplies a five volt signal to the sensor which is also connected to ground. The PCM reads the voltage drop on the sensor signal line to determine air temperature.

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Code Parameters

Code 23 will set if:

  • The PCM sees ATS temperature less than -30°C
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Diagnostic Aids

  • Refer to Temperature vs. Resistance chart.
  • When attempting to diagnose an intermittent problem. use the Scan Tool to review supplemental diagnostic information.
    • The supplemental data can be used to duplicate a problem. Select MALF History from Scan Tool EC menu.
  • Check the tightness of the female terminal grip with a spare male terminal.
  • This code may be set if the vehicle has been in extremely cold ambients. Ask the customer if this has occurred.
  • Code 23 will set if the ATS is disconnected and the ignition is cycled on.
  • ATS may be compared to CTS temperature, with a Scan Tool, if engine has been cooled overnight at ambient temperature. They should be within four degrees of each other with ignition On and engine Off
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