LEMON Manuals: Even more car manuals for everyone: 1960-2025
Home >> Mazda >> 2005 >> 3 i, Standard >> Repair and Diagnosis >> Engine Performance >> System >> On-Board Diagnostic [Engine Control System] >> DTC P2274 >> Diagnostic procedure
April 5, 2026: LEMON Manuals is launched! Read the announcement.

Diagnostic procedure

DTC P2274 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.
No Record the FREEZE FRAME DATA and DIAGNOSTIC MONITORING TEST RESULTS on the repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify related Technical Service Bulletin(s) 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.
No Go to the next step.
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.
  • Are other DTCs present?
 Yes Go to the applicable DTC inspection.
(See DTC TABLE )
No Go to the next step.
4 IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA 
  • Is DTC P2274 on FREEZE FRAME DATA?
 Yes Go to the next step.
No Go to the FREEZE FRAME DATA DTC inspection.
(See DTC TABLE )
5 VERIFY CURRENT INPUT SIGNAL STATUS OF REAR HO2S 
  • Start the engine and warm it up completely.
  • Access O2S13(1)/O2S12(2) PID using WDS or equivalent.
  • Check PID under following the accelerator pedal condition (in PARK (ATX) or NEUTRAL (MTX)).
  • 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 the accelerator pedal (lean condition)
 Yes Go to the next step.
No Visually inspect for any gas leakage between the TWC and the rear HO2S.

Then go to Step 10.
6 INSPECT THE FUEL LINE PRESSURE  Yes Inspect the malfunctioning part according to the inspection results.
Then go to the next step.
No Go to the next step.
7 INSPECT THE PURGE SOLENOID VALVE  Yes Replace the purge solenoid valve, then go to Step 10. (See INTAKE-AIR SYSTEM HOSE ROUTING DIAGRAM [LF] or INTAKE-AIR SYSTEM HOSE ROUTING DIAGRAM [L3] .)
No Go to the next step.
8 INSPECT THE FUEL INJECTOR  Yes Replace the fuel injector, then go to Step 10.
(See FUEL INJECTOR REMOVAL/INSTALLATION .)
No Go to the next step.
9 INSPECT THE ENGINE COOLANT PASSAGE FOR THE ENGINE COOLANT LEAKAGE  Yes Repair or replace the malfunctioning part according to the inspection results.
Then go to the next step.
No Go to the next step.
10 VERIFY TROUBLESHOOTING OF THE DTC P2274 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 .)
No Go to the next step.
11 VERIFY AFTER REPAIR PROCEDURE  Yes Go to the applicable DTC inspection.
(See DTC TABLE )
No Troubleshooting completed.
(1) California emission regulation applicable model
(2) Except for California emission regulation applicable model
scientia non olet · About LEMON Manuals