Repairing Manual 2004-2005 Mazda3 Engine Controls – MIL ON/DTC P0172/P2178/P2188

Repairing Manual 2004-2005 Mazda3 Engine Controls – MIL ON/DTC P0172/P2178/P2188

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2004-2005 MAZDA3 – MIL ILLUMINATION – P0172/P2178/P2188 SET APPLICABLE MODEL(S)/VINS 2004-2005 Mazda3 vehicles with VINs lower than JM1BK**** **350581 ( produced before July 1, 2005) DESCRIPTION Some vehicles may experience MIL Illumination with DTC P0172/P2178/P2188 stored in PCM memory. This may be caused by a poor connection between the terminal and harness wire at the airflow sensor connector. Other possible causes for this condition are as follow: – Erratic signal from air flow sensor due to foreign material. – Oxygen sensor malfunction. – Engine coolant temperature sensor malfunction. – Purge solenoid valve malfunction. DTCs vary depending on vehicle. -

P0172 (Fuel system too rich) – California Spec 2.0L – P2178 (Fuel system too rich at off idle) – Federal Spec 2.0L All 2.3L – P2188 (Fuel system too rich at idle) – Federal Spec 2.0L All 2.3L Customers having this concern should have their vehicle repaired using the following repair procedure. REPAIR PROCEDURE 1. Verify customer concern. 2. Record radio presets. 3. Remove battery cover and battery duct. See Workshop Manual section 01-17 BATTERY REMOVAL/INSTALLATION. Use flat screwdriver to remove clip if necessary. 4. Disconnect negative battery cable using 10mm wrench. Zoom 5. Disconnect airflow sensor connector. Sized for Print Zoom 6. Identify and carefully cut Black, protective tube of airflow sensor harness using scissors. Sized for Print 7. Using 1/16″ (1.7mm) wide pin extractor from Terminal repair kit, remove Black ground wire terminal from airflow sensor connector. Cut off ground wire terminal at base with wire cutter. 9. Remove approximately 1/2″ (10mm) of insulation from Black ground wire.