DTC P1492: AMBIENT/BATT TEMP SEN VOLTS TOO HIGH 1. Turn ignition on with engine off. Using scan tool, read battery temperature sensor voltage. Battery temperature sensor voltage may also be referred to as BTS voltage. If battery temperature sensor voltage is more than 4.5 volts, go to next step. If battery temperature sensor voltage is 4.5 volts or less, go to step 6 . 2. Turn ignition off. Disconnect battery temperature sens