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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 P2270:00, P2272:00 [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 P2270:00 or P2272:00 on the 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 DTC 
  • 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.
  • Are DTCs P2271:00 or P2273:00 present?
 Yes Go to the next step.
No Unable to duplicate or identify the concern this time.
6 INSPECT 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 component
    • 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
  • With the transaxle in P or N position, position it on a hoist.

    (See JACKING POSITIONS, VEHICLE LIFT (2 SUPPORTS) AND SAFETY STAND (RIGID RACK) POSITIONS .)

  • Visually inspect for:
    • Exhaust leaks at flanges and gaskets
    • HO2S not tightened to specification
    • Physical exhaust system concerns
    • Aftermarket exhaust system
    • Punctures or cracks in the catalyst
  • Is a concern present?
 Yes Repair or replace malfunctioning part, then go to Step 10.
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 resistance between the following PCM harness-side connector terminals and battery negative terminal.

    For DTC P2270:00: 

    • Terminal 3Z

    For DTC P2272:00: 

    • Terminal 3AB
  • Measure the resistance between the following on the PCM harness-side connector

    For DTC P2270:00: 

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

    For DTC P2272:00: 

    • 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 10.
8 INSPECT HO2S CIRCUIT FOR OPEN CIRCUIT IN WIRING HARNESS 
  • PCM and suspect HO2S connectors are disconnected.
  • Measure the resistance between the following on the wiring harness-side connector.

    For DTC P2270:00: 

    • PCM terminal 3Z and HO2S (RH) terminal B
    • PCM terminal 2G and HO2S (RH) terminal D

    For DTC P2272:00: 

    • HO2S terminal 3AB and HO2S (LH) terminal B
    • PCM terminal 2G and HO2S (LH) terminal D
  • Are the resistances less than 5 ohms?
 Yes Go to the next step.
No Repair for an open circuit, then go to Step 10
9 INSPECT HO2S CIRCUIT FOR OPEN OR SHORT CIRCUIT TO GROUND IN HO2S 
  • PCM and suspect HO2S connectors are disconnected
  • Connect 5A fuse jumper wire between suspect HO2S wiring harness-side connector terminal B and C.
  • Switch the ignition ON (Engine off)
  • Access and monitor the following PCM the HO2S signal PID using the M-MDS:

    For DTC P2270:00: 

    • O2S12

    For DTC P2272:00: 

    • 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.)
10 VERIFY TROUBLESHOOTING OF DTC P2270:00, P2272:00 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.
11 VERIFY AFTER REPAIR PROCEDURE 
 Yes Go to the applicable DTC inspection.
(See DTC TABLE [MZI-3.7] .)
No Troubleshooting completed.
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