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P1492 Ambient / Battery Temp Sensor Too High

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Mopar1973Man

By Mopar1973Man

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 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. Connect jumper wire between engine ground and terminal No. 2 (Pink/Yellow wire) on battery temperature sensor connector. Turn ignition on with engine off. Using scan tool, read battery temperature sensor voltage. If battery temperature sensor voltage is one volt or more, go to next step. If battery temperature sensor voltage is less than one volt, repair open on Black/Light Blue wire between battery temperature sensor, joint connector No. 1 and PCM. This is the ground circuit for battery temperature sensor. Joint connector No. 1 is located in power distribution center at driver's side front corner of engine compartment. See Fig. 54 . PCM is located at passenger's side rear corner of engine compartment. Perform TEST VER-5A .

3. Turn ignition off. Disconnect jumper wire from engine ground and reconnect to terminal No. 1 (Black/Light Blue wire) on battery temperature sensor connector. Ensure other end of jumper wire is still connected to terminal No. 2 (Pink/Yellow wire) on battery temperature sensor connector. Turn ignition on with engine off. Using scan tool, read battery temperature sensor voltage. If battery temperature sensor voltage is one volt or more, go to next step. If battery temperature sensor voltage is less than one volt, replace battery temperature sensor sensor. Perform TEST VER-5A .

4. Ensure ignition is on with engine off. Using voltmeter, check voltage at terminal No. 2 (Pink/Yellow wire) on battery temperature sensor connector. If voltage is 6 volts or less, go to next step. If voltage is more than 6 volts, repair short to voltage on Pink/Yellow wire between battery temperature sensor and PCM. PCM is located at passenger's side rear corner of engine compartment. Perform TEST VER-5A .

5. 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 terminal No. 2 (Pink/Yellow wire) on battery temperature sensor connector and terminal No. 15 (Pink/Yellow wire) on PCM connector C3. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-5A . If resistance is 5 ohms or more, repair open on Pink/Yellow wire between battery temperature sensor and PCM. Perform TEST VER-5A .

6. 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 .

7. 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 .

8. Turn ignition 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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