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DTC P1633: Battery Overcharge: Testing

NOTE: Check for service bulletins and on-line information.
  1. Turn ignition on. Using scan tool, monitor ALTT V and B+ PIDs. Start engine. If ALTT V PID is more than 18.5 volts and B+ PID is less than 16 volts, go to next step. If ALTT V PID is 18.5 volts or less, problem is intermittent. See TROUBLE SHOOTING - NO CODES article.
  2. Disconnect generator connector. Check connector and generator terminals. If no problems are present, go to next step. If any problems are present, repair as necessary. After repair, go to step  7 .
  3. Turn ignition on. Check voltage between generator harness connector terminal "D" (White/Red wire) and ground. If battery voltage is present, go to next step. If battery voltage is not present, problem is at generator. Go to step  6 .
  4. Turn ignition off. Disconnect PCM connector. PCM is mounted to passenger floor, behind glove box. Check connector and PCM terminals. If no problems are present, go to next step. If any problems are present, repair as necessary. After repair, go to step  7 .
  5. Turn ignition on. Check voltage between generator harness connector terminal "D" (White/Red wire) and ground. If battery voltage is not present, go to step  7 . If battery voltage is present, repair short to power on White/Red wire between PCM and generator. After repair, go to step  7 .
  6. Check voltage between generator terminal "D" and ground. If battery voltage is not present, go to next step. If battery voltage is present, replace generator. After repair, go to next step.
  7. Reconnect all components. Turn ignition off, then on. Recheck DTCs. If same DTC is present, replace PCM and go to next step. If same DTC is not present, go to next step.
  8. Perform after repair procedure. See AFTER REPAIR PROCEDURE  . If no DTC is present, testing is complete. If any DTC is present, go to appropriate test for diagnosis and repair.
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