DTC P1493: AMBIENT/BATT TEMP SEN VOLTS TOO LOW Dodge Durango I

Note. For connector terminal ID, see CONNECTOR IDENTIFICATION . For wiring diagram, see WIRING DIAGRAMS article.

Note. Ambient/battery temperature sensor voltage is monitored when ignition is on. Ambient/battery temperature sensor is referred to as battery temperature sensor. DTC may be stored in Powertrain Control Module (PCM) if PCM senses voltage from battery temperature sensor is less than .5 volts for 3 seconds. Possible causes are: defective battery temperature sensor, defective PCM, or defective connectors or wiring.

1. Turn ignition on with engine off. Using scan tool, check for DTCs. If DTC SPECIFIC GOOD TRIP counter is displayed and equal to zero, go to next step. If DTC SPECIFIC GOOD TRIP counter is not displayed and equal to zero, go to step 5 .
2. Ensure ignition is on with engine off. Using scan tool in SENSORS mode, monitor AMBIENT/BAT TMP VLT (battery temperature sensor voltage) while disconnecting 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. If battery temperature sensor voltage does not change from less than one volt to more than 4.5 volts, go to next step. If battery temperature sensor voltage changes from less than one volt to more than 4.5 volts, replace battery temperature sensor. Perform «TEST VER-5»(ref-9482-S35719050532000102700000) .
3. Turn ignition off. Ensure battery temperature sensor connector is still disconnected. Disconnect PCM connectors. PCM is located at passenger's side front corner of engine compartment on inner fender panel. Using ohmmeter, check resistance between ground and terminal 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 PCM and battery temperature sensor. Perform «TEST VER-5»(ref-9482-S35719050532000102700000) .
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-5»(ref-9482-S35719050532000102700000) . If resistance is less than 5 ohms, repair Pink/Yellow wire and Black/Light Blue wire between battery temperature sensor and PCM as they are shorted together. Perform «TEST VER-5»(ref-9482-S35719050532000102700000) .
5. Start engine and allow engine to idle. Wiggle wiring harness and connectors between PCM and battery temperature sensor while noting DTC SPECIFIC GOOD TRIP counter. PCM is located at passenger's side front corner of engine compartment on inner fender panel. Battery temperature sensor is located on battery tray, below battery and contains a 2-pin connector with Black/Light Blue and Pink/Yellow wires. If DTC SPECIFIC GOOD TRIP counter does not change to zero while wiggling wiring harness and connectors, go to next step. If DTC SPECIFIC GOOD TRIP counter changes to zero while wiggling wiring harness and connectors, repair wiring or connectors between PCM and battery temperature sensor as necessary. Perform «TEST VER-5»(ref-9482-S35719050532000102700000) .
6. Shut engine off. Ensure ignition is off. Disconnect battery temperature sensor connector and PCM connectors. Inspect battery temperature sensor connector and PCM connectors for corroded, pushed out, miswired or damaged terminals. Inspect wiring harness between battery temperature sensor and PCM for any possible intermittent problems. Also, check for related Technical Service Bulletins (TSBs). If terminals are not corroded, pushed out or damaged and wiring harness is okay, test is complete. If terminals are corroded, pushed out or damaged or wiring harness is damaged, repair as necessary. Perform «TEST VER-5»(ref-9482-S35719050532000102700000) .