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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 60 (Engine Controls [Self-Diagnostics 2.3L]) >> Diagnostic Tests >> DTC P0103: Mass Airflow/Intake Air Temperature Sensor Circuit - High Input >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different car, the 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
  1. If FREEZE FRAME DATA has been recorded, go to next step. If FREEZE FRAME DATA has not been recorded, record FREEZE FRAME DATA. Go to next step.
  2. Verify Related Repair Information Availability -  Check for related Service Bulletins and/or on-line repair information availability. If any related repair information is available, perform repair or diagnosis according to available repair information. If vehicle is not repaired, go to next step. If related repair information is not available, go to next step.
  3. Inspect MAF/IAT Sensor Connector For Poor Connection -  Turn ignition off. Disconnect MAF/IAT sensor 5-pin harness connector. Inspect for poor connection (such as damaged, pulled-out terminals, corrosion). If malfunction is not present, go to next step. If any malfunction is present, repair or replace suspected terminal or MAF/IAT sensor. After repair, go to step  7.
  4. Inspect MAF Signal Circuit For Short To Power Circuit -  Turn ignition on, engine off. Measure voltage between MAF/IAT sensor 5-pin harness connector terminal "C" (Gray/Black wire) and body ground. See Figure. If no voltage is present, go to next step. If voltage is present, repair short circuit to voltage in Gray/Black wire between MAF/IAT sensor 5-pin harness connector terminal "C" and PCM 30-pin harness connector terminal "1P". See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  7.
  5. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM harness connectors. Inspect for poor connection (such as damaged, pulled-out terminals, corrosion). If malfunction is not present, go to next step. If a malfunction is present, repair terminal. After repair, go to step  7.
  6. Inspect MAF/IAT Sensor Ground Circuit For Open Circuit -  Check for continuity between MAF/IAT sensor 5-pin harness connector terminal "B" and GND. If continuity is present, replace MAF/IAT sensor. After repair, go to next step. If continuity is not present, repair open circuit in Gray wire between MAF/IAT sensor 5-pin harness connector terminal "B" and ground terminal. After repair, go to next step.
  7. Verify Trouble Shooting Of DTC P0103 Completed -  Make sure to reconnect all disconnected connectors. Turn ignition on, engine off. Clear DTC from PCM memory using WDS or equivalent. Start engine and warm it up completely. If same DTC is present, replace PCM. For PCM removal and installation, see POWERTRAIN CONTROL MODULE under COMPUTERIZED ENGINE CONTROLS in REMOVAL & INSTALLATION article. After repair, go to next step.
  8. Verify After Repair Procedure -  Using scan tool, perform After Repair Procedure. See AFTER REPAIR PROCEDURE . If any DTCs are present, go to appropriate DTC inspection. Refer to DIAGNOSTIC TROUBLE CODE DEFINITIONS . If no DTCs are present, trouble shooting is complete.
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