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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. See Figure. Inspect for poor connection (such as damaged, pulled-out pins, corrosion). If malfunction is not present, go to next step. If any malfunctions are present, repair or replace terminal. After repair, go to step  7.
  4. Classify MAF/IAT Sensor Malfunction Or Harness Malfunction -  Connect WDS or equivalent to DLC-2. Access IAT PID. Verify IAT PID value when disconnecting MAF/IAT sensor 5-pin harness connector. If IAT PID value changed, replace MAF/IAT sensor. After repair, go to step  7
  5. Inspect IAT Signal Circuit For Short To Ground -  Turn ignition off. Disconnect PCM connectors. Check for continuity between ground and MAF/IAT sensor 5-pin harness connector terminal "D" (Blue/Black wire). See Figure. 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 30-pin harness connector terminal "2E". See ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS article in ELECTRICAL. Go to step  7.
  6. Inspect IAT Circuits For Short -  Check 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 circuit or replace wire harness. After repair, go to next step.
  7. Verify Trouble Shooting Of DTC P0112 Is Completed -  Make sure to reconnect all disconnected connectors. Clear DTC from PCM memory using WDS or equivalent. Turn ignition off. Start engine and warm it up completely. If PENDING CODE of same DTC is not present, go to next step. If PENDING CODE of 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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