Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.

DTC P2271 [L3] DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	VERIFY FREEZE FRAME DATA AND DIAGNOSTIC MONITORING TEST RESULTS HAVE BEEN RECORDED Have FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS (HO2S related) been recorded?	Yes	Go to the next step.
1		No	Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2	VERIFY REPAIR INFORMATION AVAILABILITY Verify related service Bulletins and/or on-line repair information availability. Is any related repair information available?	Yes	Perform repair or diagnosis according to the available repair information. If the vehicle is not repaired, go to the next step.
2		No	Go to the applicable DTC inspection. (See DTC TABLE .)
3	VERIFY RELATED PENDING CODE OR STORED DTC Turn the ignition switch off, then to the ON position (Engine off). Verify the related PENDING CODE or stored DTCs. Is DTC P2196 present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE .)
3		No	Go to the next step.
4	IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA Is DTC P2271 on FREEZE FRAME DATA?	Yes	Go to the next step.
4		No	Go to FREEZE FRAME DATA DTC inspection. (See DTC TABLE .)
5	VERIFY CURRENT INPUT SIGNAL STATUS OF MIDDLE HO2S Start the engine and warm it up completely. Access O2S12 PID using the WDS or equivalent. Check PID under following accelerator pedal condition (in PARK). Is PID reading normal? More than 0.45 V when accelerator pedal is suddenly depressed (rich condition). Less than 0.45 V just after release of accelerator pedal (lean condition)	Yes	Go to the next step.
5		No	Visually inspect for any gas leakage between the exhaust manifold and the middle HO2S. If there is no leakage, replace the middle HO2S. (See EXHAUST SYSTEM REMOVAL/INSTALLATION .) Then go to the next step.
6	VERIFY TROUBLESHOOTING OF DTC P2271 COMPLETED Make sure to reconnect all disconnected connectors. Clear the DTC from the PCM memory using the WDS or equivalent. Stop the vehicle and access ON BOARD READINESS TEST to inspect drive mode completion status. Verify O2S_EVAL PID changes to yes. If not, perform the DRIVE MODE again. Is the PENDING CODE for this DTC present?	Yes	Replace the PCM, then go to the next step. (See PCM REMOVAL/INSTALLATION .)
6		No	Go to the next step.
7	VERIFY AFTER REPAIR PROCEDURE Perform "AFTER REPAIR PROCEDURE". (See AFTER REPAIR PROCEDURE .) Is any DTC present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE .)
7		No	Troubleshooting completed.