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Home >> GMC >> 1995 >> Forward Control 4.3 Z, Automatic >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 4.3L >> Trouble Code Charts >> Code P0113, IAT Sensor Circuit High Input - "S" & "T" Series 4.3L (VIN W) >> Notes

Code P0113, IAT Sensor Circuit High Input - "S" & "T" Series 4.3L (VIN W): Notes

Intake Air Temperature (IAT) sensor is a thermistor. Control module applies and monitors 5 volts on circuit to sensor. When air is cold, sensor resistance is high and control module will measure a high signal voltage. If air is warm, sensor resistance is low causing control module to measure low voltage. With Code P0113 set, control module will use a default value of about 63°F (17°C) for intake air temperature. Code P0113 does not illuminate Malfunction Indicator Light (MIL).

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. Tech 1 may be used to diagnose this fault since control module transmits actual values when fault is present. A grounded circuit will cause Tech 1 to display a temperature of about 297°F (147°C).
  2. If Tech 1 displays -40° with IAT sensor disconnected, control module and wiring are okay. Replace IAT sensor.
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