MAZDA6 (2.3L)

1. Resistance Inspection
   
   Disconnect MAF/IAT sensor 5-pin harness connector. See Fig 1. Using DVOM, measure resistance between MAF/IAT sensor 5-pin connector terminals "D" and "E". See MAF/IAT SENSOR RESISTANCE SPECIFICATIONS (MAZDA6 & MPV)  table. If MAF/IAT sensor is okay, check for open or short circuit. Go to next step. If resistance readings are not as specified, replace MAF/IAT sensor.
2. Open Circuit Inspection
   
   Check for continuity between following terminals:
   • MAF/IAT sensor 5-pin harness connector terminal "D" and PCM 30-pin harness connector terminal No. 2E (Blue/Black wire). See Fig 2.
   • MAF/IAT sensor 5-pin harness connector terminal "E" and PCM 30-pin harness connector terminal No. 2H (Brown wire).

   If continuity is present, go to next step. If continuity is not present, repair open circuit in suspect wire or replace wire harness. See appropriate WIRING DIAGRAM under ENGINE PERFORMANCE in SYSTEM WIRING DIAGRAMS.

3. Short Circuit Inspection
   
   Check for continuity between following:
   • MAF/IAT sensor 5-pin harness connector terminal "E" (Brown wire) and power supply.
   • MAF/IAT sensor 5-pin harness connector terminal "D" (Blue/Black wire) and power supply.
   • MAF/IAT sensor 5-pin harness connector terminal "D" (Blue/Black wire) and ground.

If continuity is present, repair short circuit in suspect wire or replace wire harness.

Fig 1: Identifying MAF/IAT Sensor 5-Pin Connector & Terminals (Mazda6)

Courtesy of MAZDA MOTORS CORP.

Fig 2: Identifying MAF/IAT Sensor 5-Pin Harness Connector & Terminals (Mazda6)

Courtesy of MAZDA MOTORS CORP.