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Home >> Mazda >> 2013 >> 5 Grand Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 58 (Engine Controls [Self-Diagnostics 2.3L]) >> Diagnostic Tests >> DTC P0102: Mass Airflow/Intake Air Temperature Sensor Circuit - Low 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  8.
  4. Inspect Power Supply Circuit For Open Circuit -  Turn ignition on, engine off. Inspect voltage at MAF/IAT sensor 5-pin harness connector terminal "A" (White wire). See Fig 1. If battery voltage is present, go to next step. If battery voltage is not present, check for open circuit in White wire between MAF/IAT sensor 5-pin harness connector terminal "A" and main relay (inside engine fuse/relay box). See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Repair or replace harness. After repair, go to step  8.
    Fig 1: Identifying MAF/IAT Sensor Circuits & Harness Connector Terminals
    G00221497Courtesy of MAZDA MOTORS CORP.
  5. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM 30-pin harness connector. Inspect for poor connection (such as damaged, pulled-out pins, corrosion). If malfunction is not present, go to next step. If any malfunction is present, repair terminal. After repair, go to step  8.
  6. Inspect MAF/IAT Sensor Signal Circuit For Open Circuit -  Check for continuity in Gray/Black wire between MAF/IAT sensor 5-pin harness connector terminal "C" and PCM 30-pin harness connector terminal "1P". If continuity is present, go to next step. If continuity is not present, repair open circuit in Gray/Black wire between MAF/IAT sensor 5-pin harness connector terminal "C" and PCM 30-pin harness connector terminal "1P". After repair, go to step  8.
  7. Inspect MAF/IAT Sensor Signal Circuit For Shorts -  Check continuity between following circuits:
    • MAF/IAT sensor 5-pin harness connector terminal "C" (Gray/Black wire) and body ground.
    • MAF/IAT sensor 5-pin harness connector terminal "C" (Gray/Black wire) and terminal "B" (Gray wire).
    If continuity is present, repair short circuit in suspected wire or replace harness. After repair, go to next step. If continuity is not present, replace MAF/IAT sensor. After repair, go to next step.
  8. Verify Trouble Shooting Of DTC P0102 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 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.
  9. 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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