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DTC B1493: Generator "F" Terminal High: Testing

  1. If body function controller (BFC) diagnostic system check has been performed, go to next step. If body function controller (BFC) diagnostic system check has not been performed, go toBODY FUNCTION CONTROLLER (BFC) DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
  2. Disconnect generator connector. Turn ignition switch to RUN position, engine off. Using scan tool, read generator PWM. If scan tool displays zero percent, go to next step. If scan tool does not display zero percent, go to step  5 .
  3. Reconnect generator connector. Start engine. Using scan tool, read generator Pulse Width Modulation (PWM) from PCM. If scan tool displays greater than 50 percent, go to next step. If scan tool does not display greater than 50 percent, go to step  5 .
  4. Replace generator. See appropriate GENERATORS & REGULATORS article in STARTING & CHARGING SYSTEMS. After repairs, go to next step.
  5. Disconnect generator connector. Disconnect PCM Blue 80-pin connector C1 (2.4L) or PCM Clear 80-pin connector C2 (3.1L). Using DVOM, measure voltage at generator terminal "C" (Gray wire). See WIRING DIAGRAMS  . If reading is zero volts, go to step  7 . If reading is not zero volts, go to next step.
  6. Repair short to voltage in Gray wire between generator and PCM. After repairs, go to step  8 .
  7. Replace PCM. See appropriate REMOVAL, OVERHAUL & INSTALLATION article in ENGINE PERFORMANCE. After repairs, go to next step.
  8. Reconnect all disconnected components and connectors. Clear DTCs. Perform BODY FUNCTION CONTROLLER (BFC) DIAGNOSTIC SYSTEM CHECK  under SYSTEM TESTS.
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