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  • P1493 Ambient / Battery Temperture Sensor Volts Too Low

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    Mopar1973Man

    DTC P1493: AMBIENT/BATTERY TEMPERATURE SENSOR VOLTS TOO LOW

    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 less than .5 volt, go to next step. If battery temperature sensor voltage is .5 volt or more, go to step 5 .

    2. Turn ignition off. Disconnect battery temperature sensor connector. Battery temperature sensor is located on battery tray, below battery and contains a 2-pin connector with Black/Light Blue and Pink/Yellow wires. Turn ignition on with engine off. Using scan tool, read battery temperature sensor voltage. If battery temperature sensor voltage is 4 volts or less, go to next step. If battery temperature sensor voltage is more than 4 volt, replace battery temperature sensor. Perform TEST VER-5A .

    3. Turn ignition off. Ensure battery temperature sensor connector is still disconnected. Disconnect PCM connectors. PCM is located at passenger's side rear corner of engine compartment. Using ohmmeter, check resistance between ground and terminal No. 2 (Pink/Yellow wire) on battery temperature sensor connector. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground on Pink/Yellow wire between battery temperature sensor and PCM. Perform TEST VER-5A .

    4. Ensure battery temperature sensor connector and PCM connectors are still disconnected. Using ohmmeter, check resistance between terminals No. 1 (Black/Light Blue wire) and No. 2 (Pink/Yellow wire) on battery temperature sensor connector. If resistance is 5 ohms or more, replace PCM. Perform TEST VER-5A . If resistance is less than 5 ohms, repair Black/Light Blue wire and Pink/Yellow wire between PCM and battery temperature sensor as they are shorted together. Perform TEST VER-5A .

    5. Ensure ignition is on with engine off. While using scan tool to monitor battery temperature sensor voltage, wiggle wiring harness and connectors between battery temperature sensor and PCM. Battery temperature sensor is located on battery tray, below battery and contains a 2-pin connector with Black/Light Blue and Pink/Yellow wires. PCM is located at passenger's side rear corner of engine compartment. If battery temperature sensor voltage does not change while wiggling wiring harness and connectors, go to next step. If battery temperature sensor voltage changes while wiggling wiring harness and connectors, repair wiring or connector as necessary. Perform TEST VER-5A .

    6. Turn ignition off. Inspect wiring harness and connectors between battery temperature sensor and PCM. If no problems exist, go to next step. If any problems exist, repair wiring or connectors as necessary. Perform TEST VER-5A .

    7. Ensure ignition is on with engine off. At this time, DTC is intermittent. Using scan tool, go to FREEZE FRAME data and ensure CAUSED BY DTC hex code is the same as DTC on DTC screen. If DTCs displayed are not the same, repair DTC displayed with FREEZE FRAME data. If DTCs displayed are the same, try to duplicate conditions recorded in FREEZE FRAME data. Inspect battery temperature sensor connector and PCM connectors for corroded, pushed out or damaged terminals. Inspect wiring harness and connectors between battery temperature sensor and PCM for chafed, pierced or partially broken wires. If terminals are not corroded, pushed out or damaged and wiring is okay, check for Technical Service Bulletins (TSBs) that may apply. If terminals are corroded, pushed out or damaged, or wiring is damaged, repair as necessary. Perform TEST VER-5A



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