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Home >> Mazda >> 2000 >> Protege DX, Standard >> Repair and Diagnosis (Single Page) >> Engine Performance >> System >> Engine Controls - Self-Diagnostics - 1.6L >> Diagnostic Trouble Code Tests >> DTC P0123: Throttle Position (TP) Sensor Circuit High Input >> Diagnosis & Repair Procedure
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Diagnosis & Repair Procedure

  1. Ensure FREEZE FRAME PID data has been recorded. Check service bulletins. Go to next step.
  2. Turn ignition on. Using scan tool, access PID/DATA MONITOR. Record PID data for TP V. Slowly depress accelerator pedal to wide open throttle. Voltage should increase evenly as throttle opening is increased. If voltage is more than 4.8 volts, go to next step. If voltage is 4.8 volts or less, problem is intermittent (not current).
  3. Turn ignition off. Disconnect TP connector. Check connector and terminals. If no problem is found, go to next step. If problem is found, repair as necessary and go to step  8 .
  4. Check resistance between TP sensor terminals "A" and "B". Resistance should be 3200-4800 ohms. Check resistance between TP sensor terminals "B" and "C". Resistance should be 200-1200 ohms. If resistance is as specified, go to next step. If resistance is not as specified, replace TP sensor. Go to step  8 .
  5. Check continuity between TP harness connector terminal "B" (Orange wire) and ground. If continuity exists, go to next step. If continuity does not exist, repair as necessary and go to step  7 .
  6. Disconnect PCM connector. Check connector and PCM terminals. If any problem is found, repair as necessary and go to step  8 . If no problem is found, go to step  8 .
  7. Check continuity between TP sensor harness connector terminals "A" (Pink/Black wire) and "C" (Brown/Yellow wire). If continuity is not present, go to next step. If continuity is present, repair short between circuits and go to next step.
  8. Reconnect all connectors. Start engine. Clear DTC from memory. See SELF-DIAGNOSTICS - INTRODUCTION - MIATA, MILLENIA, MPV & PROTEGE article. Ensure TP V PID is .1-4.7 volts. Recheck for DTCs. If same DTC is not present, go to next step. If same DTC is present, replace PCM. Go to next step.
  9. Clear DTC from memory. Recheck for DTCs. If any DTC is present, diagnose and repair DTC. If no DTCs are present, test is complete.
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