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Symptom: P1492-AMBIENT/BATT TEMP SEN VOLTS TOO HIGH When Monitored and Set Condition: P1492-AMBIENT/BATT TEMP SEN VOLTS TOO HIGH When Monitored: With the ignition key on. Set Condition: The PCM senses the voltage from the AMBIENT/BATT temperature sensor to be above 4.9 volts for 3 seconds. POSSIBLE CAUSES SENSOR GROUND CIRCUIT OPEN AMBIENT/BATT SIGNAL CIRCUIT OPEN AMBIENT/BATT SIGNAL CIRCUIT SHORTED TO VOLTAGE AMBIENT/BATT TEMPERATURE SENSOR PCM WIRING HARNESS INTERMITTENT TEST ACTION APPLICABILITY 1 Turn the ignition on. t, read DTC’s. Is the DTC Good Trip Counter displayed and equal to zero for P1492? All Yes → No → 2 Turn the ignition off. Disconnect the AMBIENT/BATT Temperature Sensor harness All No → Repair the open Sensor Ground circuit. Yes → 3 Turn the ignition off. Disconnect the AMBIENT/BATT harness connector. Disconnect All No → Repair the open circuit. Yes → 20 CHARGING |