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Home >> Mazda >> 2002 >> Tribute LX, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 61 (Engine Controls [Self-Diagnostics 3.0L]) >> Diagnostic Tests >> DTC P0112: Intake Air Temperature 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. Check for poor connection (such as damaged, pulled-out pins, and corrosion). If no malfunction is present, go to next step. If any malfunction is present, repair or replace terminals. After repair, go to step  8.
  4. Inspect MAF/IAT Sensor Signal Circuit For Short To Ground -  Turn ignition off. Disconnect MAF/IAT sensor 5-pin harness connector. Check for continuity between MAF/IAT sensor 5-pin harness connector terminal "D" and body ground. See Fig 1. If continuity is not present, go to next step. If continuity is present, repair short circuit to ground in Blue/Black wire between MAF/IAT sensor 5-pin harness connector terminal "D" and PCM 104-pin harness connector terminal No. 39 or replace wire harness. See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. After repair, go to step  8.
    Fig 1: Identifying MAF/IAT Sensor Circuits & Harness Connector Terminals
    G00221541Courtesy of MAZDA MOTORS CORP.
  5. Inspect MAF/IAT Sensor Circuits For Short To Each Other -  Turn ignition off. Check for continuity between MAF/IAT sensor 5-pin harness connector terminal "D" (Blue/Black wire) and terminal "E" (Brown wire). If continuity is not present, go to next step. If continuity is present, repair short between circuits in wire harness between MAF/IAT sensor 5-pin harness connector and PCM 104-pin harness connector. After repair, go to step  8.
  6. Inspect MAF/IAT Sensor -  Inspect MAF/IAT sensor. Refer to INTAKE AIR TEMPERATURE SENSOR under ENGINE SENSORS & SWITCHES in SYSTEM & COMPONENT TESTING - MAZDA6, MIATA, MPV, PROTEGE & PROTEGE5 article. If MAF/IAT sensor is okay, go to next step. If MAF/IAT sensor is faulty, replace MAF/IAT sensor. After repair, go to step  8.
  7. Inspect PCM Connector For Poor Connection -  Turn ignition off. Disconnect PCM 104-pin harness connector. Check for poor connection (such as damaged, pulled-out pins, and corrosion). If no malfunction is present, go to next step. If any malfunction is present, repair or replace terminal. After repair, go to next step.
  8. Verify Trouble Shooting Of DTC P0112 Is Completed -  Make sure to reconnect all disconnected connectors. Clear DTC from PCM memory using WDS or equivalent. See CLEARING DIAGNOSTIC TROUBLE CODES  under SELF-DIAGNOSTIC SYSTEM. Turn ignition off. Start engine and warm it up completely. If same DTC is not present, go to next step. 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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