2000 Cadillac CateraFACTORY OEM SERVICE PROCEDURE

Charging System Test

  1. Turn off all electrical loads. Start engine. Connect scan tool. With scan tool, view IGNITION 1 parameter in Powertrain Control Module (PCM) data list. If voltage is 11.0-15.5 volts, go to next step. If voltage is not 11.0-15.5 volts, check wiring and connections.
  2. Turn ignition off. Connect charging system tester to battery. Operate engine at 2500 RPM. Adjust carbon pile as necessary in order to obtain maximum current output. If current output is not 74-94 amps, go to next step. If current output is 74-94 amps, go to step  8.
  3. Maintain engine speed at 2500 RPM and continue to operate generator at load test value. Measure voltage drop between generator output terminal and battery positive terminal. If voltage drop is not over 0.5 volt, go to next step. If voltage drop is less than 0.5 volt, go to step  5.
  4. Maintain engine speed at 2500 RPM and continue to operate generator at load test value. Measure voltage drop between battery negative terminal and generator metal housing. If voltage drop is not over 0.5 volt, go to step  7. If voltage drop is less than 0.5 volt, go to step  6.
  5. Check Red wire between generator output terminal and battery positive terminal for high resistance or poor connections. See WIRING DIAGRAMS . If problem was not found, go to next step. If problem was found, repair and go to step  8.
  6. Repair high resistance or poor connection in ground circuit between battery negative terminal and generator housing. See WIRING DIAGRAMS . Go to step  8.
  7. Replace generator. See GENERATOR  under REMOVAL & INSTALLATION.
  8. Operate system to verify repair.
Factory Service Tools

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.

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