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Home >> Mazda >> 2003 >> Protege ES, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Self-Diagnostics >> Diagnostic Tests >> DTC P0113: Intake Air Temperature 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 step  6.
  2. Inspect IAT Sensor Connector For Poor Connection -  Disconnect IAT sensor. Check for poor connection due to damaged, pulled-out terminals, corrosion, etc. If problem is not found, go to next step. If problem is found, repair as necessary. After repair, go to step  9.
  3. Inspect IAT Sensor -  Measure resistance between IAT sensor terminals. If resistance reading is 270-2900 ohms, go to next step. If resistance reading is not as specified, replace IAT sensor. After repair, go to step  9.
  4. Inspect IAT Sensor Signal Circuit For Short To Power -  Turn ignition on, engine off. Measure voltage between ground and IAT sensor harness connector terminal "B" (Blue/White wire). If battery voltage is not present, go to next step. If battery voltage is present, repair short circuit to power in Blue/White wire between IAT sensor harness connector "B" and PCM 104-pin harness connector terminal No. 39. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  9.
  5. Inspect IAT Sensor Ground Circuit For Short To Power -  Measure for voltage between ground and IAT sensor harness connector terminal "A" (Orange wire). If battery voltage is not present, go to next step. If battery voltage is present, repair short circuit to power in Orange wire between IAT sensor harness connector terminal "A" and PCM connector terminal No. 91. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. Go to step  9.
  6. Inspect PCM Connector Poor Connection -  Turn ignition off. Disconnect PCM 104-pin harness connector. See Figure. Check for poor connection due to damaged, pulled-out terminals, corrosion, etc. If problem is not found, go to next step. If problem is found, repair as necessary. After repair, go to step  9.
  7. Inspect IAT Sensor Signal Circuit For Open Circuit -  Connect 104-pin Breakout Box (49-UN01-130) to PCM harness connector only. See Figure. Check for continuity between IAT sensor harness connector terminal "B" (Blue/White wire) and breakout box terminal No. 39. If continuity is present, go to next step. If continuity is not present, repair open circuit in Blue/White wire IAT sensor harness connector terminal "B" and PCM 104-pin harness connector terminal No. 39. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. After repair, go to step  9.
  8. Inspect IAT Sensor Ground Circuit For Open Circuit -  Check for continuity between IAT sensor harness connector terminal "A" (Orange wire) and breakout box terminal No. 91. See Figure. If continuity is present, go to next step. If continuity is not present, repair open circuit in Orange wire between IAT sensor harness connector terminal "A" and PCM 104-pin harness connector terminal No. 91. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS. Go to next step.
  9. Verify Trouble Shooting Of DTC P0113 Completed -  Reconnect all connectors. Turn ignition on, engine off. Clear DTCs. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Start engine. Check for DTCs. See RETRIEVING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. If DTC P0113 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 P0113 is not present, go to next step.
  10. 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 .
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