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Home >> Mazda >> 2000 >> MX-5 Miata Base, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P1631: Generator Output Malfunction >> Diagnosis & Repair Procedure

Diagnosis & Repair Procedure

  1. Check service bulletins. Go to next step.
  2. Turn ignition on. Using scan tool, access PID/DATA MONITOR. Record PID data for ALT V. Start engine. If ALTT V PID is less than 8.4 volts, go to next step. If ALTT V PID is 8.4 volts or more, problem is intermittent (not current).
  3. Turn ignition off. check belt tensioner. If belt tensioner is out of limits or belt is faulty, repair as necessary and go to step  10. If no problem is found, go to next step.
  4. Turn ignition off. Disconnect PCM connectors. Inspect PCM and harness connector terminals. If no problem is found, go to next step. If any terminal is faulty, repair as necessary and go to step  10.
  5. Disconnect generator connector. Inspect generator and harness connector terminals. If no problem is found, go to next step. If any terminal is faulty, repair as necessary and go to step  10.
  6. Check continuity between generator harness connector terminal "D" (Gray/Red wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground. Go to step  10.
  7. Check continuity between generator harness connector terminal "P" (Gray wire) and ground. If continuity is not present, go to next step. If continuity is present, repair short to ground. Go to step  10.
  8. Check continuity of Gray/Red wire between harness connector terminal "D" and PCM connector No. 1 terminal "O". If continuity is present, go to next step. If continuity is not present, repair Gray/Red wire and go to step  10.
  9. Check continuity of Gray wire between harness connector terminal "P" and PCM connector No. 1 terminal "T". If continuity is present, replace generator and go to next step. If continuity is not present, repair Gray wire and go to next step.
  10. Connect all connectors. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Turn ignition off. Start engine. If same DTC is not present, go to next step. If same DTC is present, replace PCM. Go to next step.
  11. Erase DTC. See CLEARING CODES in SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. If any DTC is present, go to appropriate test. If no DTC is present, test is complete.
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