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Home >> Chevrolet >> 1995 >> Lumina Base >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - 3.4L >> ECM/Pcm Code Charts >> Code P0117, Coolant Temp. Sensor Low Temperature Indicated >> Notes

Code P0117, Coolant Temp. Sensor Low Temperature Indicated: Notes

ECT sensor uses a thermistor to control signal voltage to PCM. PCM applies and monitors a 5-volt reference signal to sensor. When engine coolant is cold, sensor (thermistor) resistance is high and PCM will sense a high signal voltage. As engine coolant increases, sensor resistance becomes less and PCM voltage drops.

NOTE: Test numbers refer to numbers on diagnostic chart.
  1. Determines if conditions necessary to set Code P0117 exist.
  2. Determines if sensor signal circuit is shorted to ground.
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