Code 14: Coolant Temp Sensor Signal Volt Low: Notes

As the engine warms, sensor resistance becomes less and monitored voltage drops. At normal engine operating temperature, voltage will measure about 1.5-2.0 volts.

1. Code 14 will set if monitored voltage indicates a coolant temperature greater than 284°F (140°C) for .4 second or more.
2. This test determines if circuit No. 410 is shorted to ground, which will cause the conditions for Code 14. If Code 14 is set, the ECM uses a default coolant value of about 120°F (49°C). However, the "Scan" tester will read the actual temperature indicated by the sensor.