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Symptom: P1493-AMBIENT/BATTERY TEMPERATURE SENSOR VOLTAGE When Monitored and Set Condition: P1493-AMBIENT/BATTERY TEMPERATURE SENSOR VOLTAGE TOO LOW When Monitored: With the ignition on. Set Condition: The PCM senses the voltage from the Battery Temperature Sensor below 0.5 of a volt for 3 seconds. POSSIBLE CAUSES BATTERY TEMP SENSOR VOLTS BELOW 0.5 OF A VOLT BATTERY TEMPERATURE SENSOR (K25) BATTERY TEMP SIGNAL CIRCUIT SHORTED TO GROUND (K25) BATTERY TEMP SIGNAL CIRCUIT SHORTED TO THE (K900) SENSOR GROUND PCM TEST ACTION APPLICABILITY 1 Ignition on, engine not running. t, monitor the Ambient/Battery Temperature Sensor voltage. Is the voltage below 0.5 of a volt? All Yes → Go To 2 No → Refer to the INTERMITTENT CONDITION Symptom (Diagnos- tic Procedure). 2 Ignition on, engine not running. t in sensors, read the Battery Temp Sensor voltage. Disconnect the Battery Temp Sensor harness connector. All Yes → Replace the Battery Temperature Sensor. Perform POWERTRAIN VERIFICATION TEST VER - 5. No → Go To 3 3 Turn the ignition off. All Yes → Repair the short to ground in the (K25) Batt Temp Signal circuit. Perform POWERTRAIN VERIFICATION TEST VER - 5. No → Go To 4 163 DRIVEABILITY - GAS |