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  • P1682 Charging System Voltage Too Low

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    DTC P1682: CHARGING SYSTEM VOLTAGE TOO LOW

    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 abe referred to as BTS voltage. If battery temperature sensor voltage is more than zero volts, replace PCM. Perform TEST VER-3A . PCM is located at passenger's side rear corner of engine compartment. If battery temperature sensor voltage is zero volts, replace battery temperature sensor. Perform TEST VER-3A .

    4. 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, go to step 12 .

    5. 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-3A .

    6. 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-3A .

    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.

    8. Turn ignition off. Disconnect PCM connectors. PCM is located at passenger's side rear corner of engine compartment. Disconnect round 2-wire connector at rear of the generator. 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 round 2-wire connector for the generator and replace PCM. Perform TEST VER-3A .

    9. Ensure PCM connectors and round 2-wire connector at rear of generator are still disconnected. Using ohmmeter, check resistance between terminal No. 1 (Dark Green wire) on round 2-wire connector for the 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 round 2-wire connector for the generator. Perform TEST VER-3A .

    10. Ensure PCM connectors and round 2-wire connector at rear of generator are still disconnected. Using ohmmeter, check resistance between ground and terminal No. 25 (Dark Blue wire) on PCM connector C3. If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair short to ground on Dark Blue wire between PCM and round 2-wire connector for the generator. Perform TEST VER-3A .

    11. Ensure PCM connectors and round 2-wire connector at rear of generator are still disconnected. Using ohmmeter, check resistance between terminal No. 2 (Dark Blue wire) on round 2-wire connector for the generator and terminal No. 25 (Dark Blue wire) on PCM connector C3. If resistance is less than 5 ohms, replace PCM. Perform TEST VER-3A . If resistance is 5 ohms or more, repair open on Dark Blue wire between PCM and round 2-wire connector for the generator. Perform TEST VER-3A .

    12. Shut engine off. Ensure ignition is off. Connect voltmeter between positive battery terminal on rear of generator and positive battery terminal. 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 on Black wire and Red wire between generator and the battery. Perform TEST VER-3A .

    13. Turn ignition off. Connect voltmeter between generator case and negative battery terminal. Start engine and warm engine to normal operating temperature. Note voltage reading. If voltage is .1 volt or less, test is complete. If voltage is more than .1 volt, repair generator ground for high resistance between generator case and negative battery terminal. Perform TEST VER-3A .


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