DTC P1478: Battery Temp Sensor Volts Out Of Limit: Description

NOTE: Battery temperature sensor is may also be referred to as ambient temperature sensor.

Ambient temperature sensor voltage is monitored when ignition is on. DTC will set in PCM memory if PCM senses ambient temperature sensor voltage is more than 4.9 volts or less than .1 volt for more than 3.2 seconds. Possible causes are: defective ambient temperature sensor, high resistance in ambient temperature sensor ground circuit, high resistance in ambient temperature sensor signal circuit or defective PCM.