LEMON Manuals: Even more car manuals for everyone
Home >> Mazda >> 2003 >> Protege ES, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0123: Throttle Position Sensor Circuit - High Input >> Diagnostic Procedure

Diagnostic Procedure

  1. Verify Related Repair Information Availability -  Turn ignition off. Connect scan tool to DLC-2. Turn ignition on, engine off. Monitor for FREEZE FRAME DATA and ensure data has been recorded. Check service bulletins for repair information related to this DTC. If repair information is not available, go to next step. If repair information is available, perform diagnosis and repair as necessary. After repair, go to next step.
  2. Check TP Sensor Connector -  Turn ignition off. Ensure TP sensor 3-pin harness connector is connected securely. If TP sensor connector is securely connected, go to next step. If TP sensor connector is loose, reconnect TP sensor 3-pin harness connector securely. After repair, go to step  8.
  3. Inspect TP Sensor Connector For Poor Connection -  Disconnect TP 3-pin harness connector. Check for poor connection due to damaged, pulled-out terminals, corrosion, etc. If no problem is found, go to next step. If problem is found, repair as necessary. After repair, go to step  8.
  4. Check TP Sensor Resistance -  Check resistance between TP sensor terminals "A" and "B". See Figure. Resistance reading should be 3200-4800 ohms. Check resistance between TP sensor terminals "B" and "C". Resistance reading should be 200-1200 ohms. If both resistance readings are as specified, go to next step. If both resistance readings are not as specified, replace TP sensor. After repair, go to step  8.
  5. Verify TP Sensor Ground Circuit For Open Circuit At TP Sensor Connector -  Check continuity between ground and TP sensor 3-pin harness connector terminal "B" (Orange wire). See Figure. If continuity is not present, go to next step. If continuity is present, go to step  7.
  6. Check PCM Connector -  Disconnect PCM 104-pin harness connector. Check for poor connection due to damaged, pulled-out terminals, corrosion, etc. If any problem is found, repair as necessary and go to step  8. If no problem is found, repair open circuit in Orange wire between TP sensor 3-pin harness connector terminal "B" and PCM 104-pin harness connector terminal No. 91. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  8.
  7. Verify TP Signal Circuit For Short To Constant Voltage Circuit -  Check continuity between TP sensor 3-pin harness connector terminals "A" and "C". See Figure. If continuity is not present, go to next step. If continuity is present, repair short between circuits. After repair, go to next step.
  8. Verify Trouble Shooting Of DTC P0123 Completed -  Reconnect all connectors. Turn ignition on, engine off. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. Race engine several times. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0123 is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL, OVERHAUL & INSTALLATION article. After repair, go to next step. If same DTC P0123 is not present, go to next step.
  9. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If no other DTCs are present, testing is complete. If any other DTC is present, follow appropriate DTC diagnostic procedure. See DIAGNOSTIC TROUBLE CODE DEFINITIONS .
scientia non olet · About LEMON Manuals