DTC P1682: CHARGING SYSTEM VOLTAGE TOO LOW Jeep Cherokee II рестайлинг

Note. For connector terminal identification, see CONNECTOR IDENTIFICATION . For circuit identification and wiring diagram, see CHEROKEE wiring diagram in WIRING DIAGRAMS article.

Note. DTC P1682: CHARGING SYSTEM VOLTAGE TOO LOW is monitored with engine running at more than 1500 RPM for more than 25 seconds. DTC may be stored in Powertrain Control Module (PCM) when PCM senses attempts to regulate generator field indicate no field problems but voltage output does not increase. Possible causes are: defective Battery Temperature Sensor (BTS), defective generator, defective PCM, defective connector or defective wiring.

1. Turn ignition off. Ensure battery is fully charged and generator belt and tension are okay. Start engine and allow it to idle. Using scan tool, read TARGET CHARGING voltage. If voltage is more than 15.1 volts, go to next step. If voltage is 15.1 volts or less, go to step 5).
2. Turn ignition on, with engine off. Using scan tool, read BTS temperature. Using a thermometer, measure underhood temperature near battery tray. If BTS temperature is not within 10 degrees of underhood temperature, go to next step. If BTS temperature is within 10 degrees of underhood temperature, go to step 5).
3. Turn ignition off. Disconnect BTS connector. BTS is located under battery. Clean and/or repair connector as necessary. Connect jumper wire across BTS sensor terminals. Turn ignition on, with engine off. Using scan tool, read BTS voltage. If voltage is zero, replace BTS. Perform TEST VER-3A. If voltage is not zero, go to next step.
4. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-3A.
5. Ensure engine is still idling Turn all accessories off. Manually set engine speed to 1600 RPM. Using scan tool, read TARGET CHARGING voltage and CHARGING voltage. Compare readings and monitor voltage. If voltage difference is more than one volt, go to next step. If voltage difference is not more than one volt, go to step 14).
6. Start engine and allow it to idle. Using a voltmeter, check voltage between positive battery post and Generator (GEN) positive battery cable terminal. If voltage is .4 volt or less, go to next step. If voltage is more than .4 volt, repair positive battery circuit for high resistance between battery and generator. Perform TEST VER-3A.
7. Ensure ignition is off. Using voltmeter, check voltage between generator case and negative battery post. Start engine and warm to normal operating temperature. If voltage is .1 volt or less, go to next step. If voltage is more than .1 volt, repair ground circuit for high resistance between battery and generator. Perform TEST VER-3A.
8. Turn engine off. Turn ignition on, with engine off. Using scan tool, actuate GEN field driver circuit. Using voltmeter, check voltage at both generator field terminals. If voltage is less than 3 volts at either terminal, go to next step. If voltage is 3 volts or more at both terminal, charging system is okay at this time. Perform TEST VER-3A.
9. Turn ignition off. Disconnect PCM connectors. PCM is located in engine compartment. See PCM LOCATION table under SYSTEM DIAGNOSTICS. Clean and/or repair connectors as necessary. Using an ohmmeter, check resistance between ground and PCM connector, GEN field driver circuit (Dark Green wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair GEN field driver circuit for short to ground and replace PCM. Perform TEST VER-3A.
10. Turn ignition off. Ensure PCM connectors are still disconnected. Using ohmmeter, check resistance of GEN field driver circuit (Dark Green wire) between PCM and generator. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open GEN field driver circuit. Perform TEST VER-3A.
11. Turn ignition off. Ensure PCM connectors are still disconnected. Using ohmmeter, check resistance between ground and PCM connector, GEN field source circuit (Dark Green/Orange wire). If resistance is 5 ohms or more, go to next step. If resistance is less than 5 ohms, repair GEN field source circuit for short to ground and replace PCM. Perform TEST VER-3A.
12. Turn ignition off. Ensure PCM connectors are still disconnected. Using ohmmeter, check resistance of GEN field source circuit (Dark Green/Orange wire) between PCM and generator. If resistance is less than 5 ohms, go to next step. If resistance is 5 ohms or more, repair open GEN field source circuit. Perform TEST VER-3A.
13. At this time, PCM is assumed to be defective. Replace PCM. Perform TEST VER-3A.
14. Ensure engine is still idling Using a voltmeter, check voltage between positive battery post and GEN positive battery cable terminal. If voltage is .4 volt or less, go to next step. If voltage is more than .4 volt, repair positive battery circuit for high resistance between battery and generator. Perform TEST VER-3A.
15. Turn engine off. Using a voltmeter, check voltage between generator case and negative battery post. Start engine and warm to normal operating temperature. If voltage is .1 volt or less, test is complete. If voltage is more than .1 volt, repair ground circuit for high resistance between battery and generator. Perform TEST VER-3A.