DTC P1492: AMBIENT/BATT TEMP SEN VOLTS TOO HIGH 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 more than 4.9 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 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. Using ohmmeter, check resistance between ground and terminal No. 1 (Black/Light Blue wire) on battery temperature sensor connector. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open on Black/Light Blue wire between PCM and battery temperature sensor. PCM is located at passenger's side front corner of engine compartment on inner fender panel. Perform «TEST VER-5»(ref-9482-S35719050532000102700000) .
3. Ensure ignition is off and 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 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, go to next step. If resistance is 5 ohms or more, repair open on Pink/Yellow wire between battery temperature sensor and PCM. Perform «TEST VER-5»(ref-9482-S35719050532000102700000) .
4. Ensure ignition is off and battery temperature sensor connector is still disconnected. Reinstall PCM connectors. Start engine and allow engine to idle. Using voltmeter, check voltage at terminal No. 2 (Pink/Yellow wire) on battery temperature sensor connector. If voltage is 5.5 volts or less, shut engine off. Go to next step. If voltage is more than 5.5 volts, repair short to voltage on Pink/Yellow wire between battery temperature sensor and PCM. Perform «TEST VER-5»(ref-9482-S35719050532000102700000) .
5. Ensure battery temperature sensor connector is still disconnected. Turn ignition on with engine off. Using scan tool in SENSORS mode, read AMBIENT/BAT TMP VLT (battery temperature sensor voltage) while connecting jumper wire between terminals No. 1 (Black/Light Blue wire) and No. 2 (Pink/Yellow wire) on battery temperature sensor connector. If battery temperature sensor voltage changes from more than 4.5 volts to less than one bolt, replace battery temperature sensor. Perform «TEST VER-5»(ref-9482-S35719050532000102700000) . If battery temperature sensor voltage does not change from more than 4.5 volts to less than one bolt, replace PCM. Perform «TEST VER-5»(ref-9482-S35719050532000102700000) .
6. 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) .
7. 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) .