MAZDA6 (3.0L)

WARNING: This page is about a different car, the 2003 Mazda Protege5, 2003 Mazda Protege, 2003 Mazda MX-5 Miata, 2003 Mazda MPV, and 2003 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

Visually check Mass Airflow/Intake Air Temperature (MAF/IAT) sensor for cracks, bent or corroded terminals, or damage. If any fault is present, replace MAF/IAT sensor. If MAF/IAT sensor is okay, connect scan tool to DLC-2. Access MAF PID. See MAF/IAT SENSOR SPECIFICATIONS (A/T) or MAF/IAT SENSOR SPECIFICATIONS (M/T) . If MAF PID value is not as specified, check for open or short circuit. Go to next step.

Open Circuit Inspection

Disconnect PCM 104-pin harness connector and MAF/IAT sensor 5-pin harness connector. Check for continuity between following terminals:
- MAF/IAT sensor 5-pin harness connector terminal "A" and main relay 4-pin harness connector terminal "C" (White wire).
- MAF/IAT sensor 5-pin harness connector terminal "B" and PCM 104-pin harness connector terminal No. 77 (Gray wire).
- MAF/IAT sensor 5-pin harness connector terminal "C" and PCM 104-pin harness connector terminal No. 88 (Gray/Black 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.

Short Circuit Inspection

Check for continuity between following:
- MAF/IAT sensor 5-pin harness connector terminal "A" (White wire) and body GND.
- MAF/IAT sensor 5-pin harness connector terminal "B" (Gray wire) and power supply.
- MAF/IAT sensor 5-pin harness connector terminal "C" (Gray/Black wire) and power supply.
- MAF/IAT sensor 5-pin harness connector terminal "C" (Gray/Black wire) and body GND.
If continuity is present, repair short circuit to ground in suspect wire or replace wire harness.