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Home >> Mazda >> 2012 >> 6 i Touring >> Repair and Diagnosis >> External Pages >> Different car >> Section 632 (On-Board Diagnostic (Engine Control System MZI-3.7) (5 Of 5)) >> DTC P2271:00, P2273:00 [MZI-3.7] >> Diagnostic procedure

Diagnostic procedure

WARNING: This page is about a different car, the 2009 Mazda 6. However, it is still accessible from the selected car via links, so may be relevant.
STEP INSPECTION ACTION
1 VERIFY FREEZE FRAME DATA HAS BEEN RECORDED 
  • Has FREEZE FRAME DATA been recorded?
 Yes Go to the next step.
No Record FREEZE FRAME DATA on the repair order, then go to the next step.
2 VERIFY RELATED REPAIR INFORMATION AVAILABILITY 
  • Verify related Service Bulletins and/or on-line repair information availability.
  • Is any related Service Bulletins available?
 Yes Perform repair or diagnosis according to the available Service Bulletins.
  • If the vehicle is not repaired, go to the next step.
No Perform the PCM reprogramming procedure.
(See PCM CONFIGURATION [MZI-3.7] .) Then go to the next step.
3 VERIFY RELATED PENDING CODE OR STORED DTCs 
  • Switch the ignition off then to the ON position (Engine off).
  • Verify the related PENDING CODE or stored DTCs using the M-MDS?
 Yes Go to the appropriate DTC troubleshooting.
(See DTC TABLE [MZI-3.7] .)
No Go to the next step.
4 IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA 
  • Is DTC P2271:00 or P2273:00 on FREEZE FRAME DATA?
 Yes Go to the next step.
No Go to the troubleshooting for the DTC on the FREEZE FRAME DATA.
(See DTC TABLE [MZI-3.7] .)
5 INSPECT FOR KOER DTCS 
  • Switch the ignition ON (Engine off)
  • Clear the DTCs.
  • Start the engine
  • Run the engine at approximately 2, 000 RPM Maintain the engine speed for 3 min.
  • Retrieve the continuous memory DTCs
  • Is DTC P2271:00 or P2273:00 present?
 Yes Go to the next step.
No Unable to duplicate or identify the concern at this time
6 CHECK IF HO2S SIGNAL LEVEL IS TOO HIGH 
NOTE:
  • Fuel calculations can be affected by unmetered air leaks.

  • Switch the ignition off
  • Carefully inspect the following areas for potential air leaks:
    • Hoses connecting to the MAF sensor assembly
    • Hoses connecting to the throttle body
    • Intake manifold gasket leaks
    • PCV system
    • Vacuum lines are disconnected
    • Improperly seated engine oil dipstick, tube or oil fill cap
    • Exhaust leaks at flanges and gaskets
  • Is a concern present?
 Yes Repair or replace malfunctioning part, then go to Step 11.
No Go to the next step.
7 INSPECT FOR SHORT CIRCUIT BETWEEN CIRCUITS IN HO2S WIRING HARNESS 
  • Switch the ignition off
  • Disconnect the PCM and suspect HO2S connectors
  • Measure the voltage between following PCM wiring harness-side connector terminal and battery negative terminal.

    For DTC P2271:00: 

    • Terminal 3Z

    For DTC P2273:00: 

    • Terminal 3AB
  • Are the resistances less than 1.0?
 Yes Go to the next step.
No Repair for a short circuit, then go to Step 11.
8 INSPECT FOR SHORT CIRCUIT BETWEEN CIRCUITS IN HO2S WIRING HARNESS 
  • PCM and suspect HO2S connectors are disconnected
  • Measure the resistance between the following on the PCM wiring harness-side connector.

    For DTC P2271:00: 

    • Terminal 3Z and terminal 2G
    • Terminal 3Z and terminal 3N

    For DTC P2273:00: 

    • Terminal 3AB and terminal 2G
    • Terminal 3AB and terminal 3AM
  • Are the resistances greater than 10 kilohms?
 Yes Go to the next step.
No Repair for a short circuit, then go to Step 11
9 INSPECT HO2 CIRCUIT FOR SHORT CIRCUIT TO POWER SUPPLY IN WIRING HARNESS 
  • Disconnect the PCM and suspect HO2S connectors
  • Measure the voltage between the following suspect HO2S terminal and on the harness-side connector.

    For DTC P2271:00: 

    • HO2S (RH) terminal B

    For DTC P2273:00: 

    • HO2S (LH) terminal B
  • Are the resistances greater than 10 kilohms?
 Yes Go to the next step.
No Repair for a short circuit, then go to Step 11.
10 CHECK HO2S CIRCUIT VOLTAGE FOR SHORT CIRCUIT TO POWER SUPPLY IN HO2S 
  • Switch the ignition off.
  • Reconnect PCM connector.
  • Disconnect the suspect HO2S connector.
  • Connect a 5A fuse jumper wire between terminal B and C on the suspect HO2S wiring harness-side connector.
  • Start the engine and run it at idle
  • Access and monitor the following PCM the HO2S Signal PID using the M-MDS.

    For DTC P2271:00: 

    • O2S12

    For DTC P2273:00: 

    • O2S22
  • Is the voltage greater than 1.5 V?
 Yes Replace the suspect HO2S.
(See HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [MZI-3.7] .)
Then go to the next step.
No Go to the next step.
(The system is operating normally at this time. The concern may have been caused by a loose or corroded connector.)
11 VERIFY TROUBLESHOOTING OF DTC P2271:00, P2273:00 HAS BEEN COMPLETED 
  • Verify that all disconnected connectors are reconnected.
  • Switch the ignition ON (Engine off)
  • Clear the DTC from the PCM memory using the M-MDS
  • Perform no load racing at the engine speed of 2, 500-3, 500 RPM for 60s or more, then idle the engine for 60s or more.
  • Perform the KOER self-test.
  • Retrieve DTCs using the M-MDS.
  • Is the PENDING CODE for this DTC present?
 Yes Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [MZI-3.7] .)
No Go to the next step.
12 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection
(See DTC TABLE [MZI-3.7] )
No Troubleshooting completed.
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