DTC P1682: CHARGING SYSTEM VOLTAGE TOO LOW Dodge Durango I

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

Note. Charging system voltage is monitored when ignition is on and engine is more than 1500 RPM for 25 seconds. DTC may be stored in Powertrain Control Module (PCM) if PCM regulates generator field with no detected field problems but voltage output does not increase. Possible causes are: defective battery temperature sensor, defective PCM, or defective connectors or wiring.

1. Ensure battery is fully charged and generator drive belt is in good condition and properly adjusted before proceeding. Start engine and allow engine to idle. Using scan tool, read target charging voltage. If target charging voltage is more than 15.1 volts, go to next step. If target charging voltage is 15.1 volts or less, go to step 4 .
2. Ensure engine is idling and at normal operating temperature. Using scan tool, read temperature of battery temperature sensor. Using thermometer, measure underhood temperature near battery tray. If underhood temperature is not within 10 degrees of temperature of battery temperature sensor, go to next step. If underhood temperature is within 10 degrees of temperature of battery temperature sensor, go to step 4 .
3. Shut engine off. Ensure ignition is 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 electrical terminals on battery temperature sensor connector. 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 zero volts, replace PCM. Perform «TEST VER-3»(ref-9482-S32123480852000102700000) . PCM is located at passenger's side front corner of engine compartment on inner fender panel. If battery temperature sensor voltage is zero volts, replace battery temperature sensor. Perform «TEST VER-3»(ref-9482-S32123480852000102700000) .
4. Shut engine off. Ensure ignition is off. Connect voltmeter between positive terminal on the battery and positive battery terminal on rear of the generator. Start engine and warm engine to normal operating temperature. Note voltage reading. If voltage is .4 volt or less, go to next step. If voltage is more than .4 volt, repair high resistance between positive battery terminal and positive battery terminal on rear of the generator. Perform «TEST VER-3»(ref-9482-S32123480852000102700000) .
5. Shut engine off. Ensure ignition is off. Connect voltmeter between case of generator and negative battery terminal. Start engine and warm engine to normal operating temperature. Note voltage reading. If voltage is .1 volt or less, go to next step. If voltage is more than .1 volt, repair generator for high resistance between generator case and negative battery terminal. Perform «TEST VER-3»(ref-9482-S32123480852000102700000) .
6. Ensure engine is idling and at normal operating temperature. Turn on all accessories. Adjust engine speed to 1600 RPM. Using scan tool, read target charging voltage and charging voltage. Compare the 2 readings. If difference between the 2 readings is more than one volt, go to next step. If difference between the 2 readings is one volt or less, test is complete.
7. Shut engine off. Turn ignition on with engine off. Using scan tool, actuate generator field driver. Using voltmeter, check voltage at each terminal in 2-wire connector at rear of generator. If voltage is less than 3 volts at either terminal, go to next step. If voltage is 3 volts or more at both terminals, charging system is operating properly at this time. Test is complete.
8. Ensure ignition is on with engine off. Using scan tool, check for DTCs and record FREEZE FRAME data. Using scan tool, clear DTCs from PCM. Turn ignition off. Inspect PCM connectors, battery temperature sensor connector and 2-wire connector at rear of generator for corroded, pushed out or damaged terminals. If terminals are not corroded, pushed out or damaged, go to next step. If terminals are corroded, pushed out or damaged, repair as necessary. Perform «TEST VER-3»(ref-9482-S32123480852000102700000) .
9. Turn ignition on with engine off. Using scan tool, actuate generator field driver. Using voltmeter, check voltage at terminal No. 1 (White/Dark Blue wire) in 2-wire connector at rear of generator. If voltage is more than 10 volts, go to next step. If voltage is 10 volts or less, repair open on White/Dark Blue wire between PCM and 2-wire connector at rear of generator. Perform «TEST VER-3»(ref-9482-S32123480852000102700000) . PCM is located at passenger's side front corner of engine compartment on inner fender panel.
10. Turn ignition off. Disconnect 2-wire connector at rear of generator and 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 No. 10 (Dark Green wire) on PCM connector C2. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground on Dark Green wire between PCM and 2-wire connector at rear of generator. Perform «TEST VER-3»(ref-9482-S32123480852000102700000) .
11. Ensure 2-wire connector at rear of generator and PCM connectors are still disconnected. Using ohmmeter, check resistance between terminal No. 2 (Dark Green wire) on 2-wire connector at rear of generator and terminal No. 10 (Dark Green wire) on PCM connector C2. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open on Dark Green wire between PCM and 2-wire connector at rear of generator. Perform «TEST VER-3»(ref-9482-S32123480852000102700000) .
12. Ensure 2-wire connector at rear of generator and PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and terminal No. 25 (White/Dark Blue wire) on PCM connector C3. If resistance is 5 ohms or more, replace PCM. Perform «TEST VER-3»(ref-9482-S32123480852000102700000) . If resistance is less than 5 ohms, repair short to ground on White/Dark Blue wire between PCM and 2-wire connector at rear of generator. Perform «TEST VER-3»(ref-9482-S32123480852000102700000) .