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Code 15, Coolant Sensor Temperature Too Low: Notes

Fig 1: Code 15, Fow Chart (1 of 2) - Coolant Sensor Temp Too Low
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Fig 2: Code 15, Fow Chart (2 of 2) - Coolant Sensor Temp Too Low
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  1. Checks to see if code was set as a result of hard failure or intermittent condition. Code will set if engine has been running for more than 60 seconds. Signal voltage indicates a coolant temperature less than -35°F (-37°C).
  2. This test simulates conditions for a Code 14. If the ECM recognizes the grounded circuit (low voltage), and displays a high temperature, the ECM and wiring are okay.
  3. This test will determine if there is a wiring problem or a faulty ECM. If circuit No. 452 is open, there may also be a Code 21 stored.
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