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Home >> Mazda >> 2012 >> 6 i Touring >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 23 (On-Board Diagnostic [Engine Controls MZI 3.7] (5 Of 5)) >> DTC P2271:00, P2273:00 >> Diagnostic Procedure

Diagnostic Procedure

WARNING: This page is about a different variant/trim than selected.
STEP INSPECTION ACTION
1 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 .)
2 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.
3 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 .)
Then go to the next step.
4 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 .)
No Go to the next step.
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 HO2CIRCUIT FOR SHORT CIRCUIT 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 .)
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.

    (See KOEO/KOER SELF TEST .)

  • Is the PENDING CODE for this DTC present?
 Yes Repeat the inspection from Step 1.

Go to the next step.
No Go to the next step.
12 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE .)
No Troubleshooting completed.
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