DTC P2270, P2272 [MZI-3.7]
id0102d2882400
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DTC P2270 DTC P2272 |
P2270: Rear HO2S (RH) signal stuck lean P2272: Rear HO2S (LH) signal stuck lean |
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DETECTION CONDITION
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• The downstream HO2S is forced rich and monitored by the PCM. The test fails if the PCM does not detect the output of the HO2S in a calibrated amount of time
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POSSIBLE CAUSE
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• Leakage exhaust gas
• Rear HO2S malfunction
• PCM malfunction
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Diagnostic procedure
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STEP |
INSPECTION |
ACTION |
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1
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VERIFY FREEZE FRAME DATA HAS BEEN RECORDED
• Has FREEZE FRAME DATA been recorded?
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Yes
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Go to the next step.
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No
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Record FREEZE FRAME DATA on the repair order, then go to the next step.
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2
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VERIFY RELATED SERVICE INFORMATION AVAILABILITY
• Verify related Service Information availability.
• Is any related Service Information available?
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Yes
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Perform repair or diagnosis according to the available Service Information.
• If the vehicle is not repaired, go to the next step.
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No
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Perform the PCM reprogramming procedure.
(See PCM CONFIGURATION [MZI-3.7].)
Then go to the next step.
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3
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VERIFY RELATED PENDING CODE OR STORED DTCs
• Turn the ignition switch off then to the ON position (Engine off).
• Verify the related PENDING CODE or stored DTCs using the M-MDS.
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Yes
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Go to the appropriate DTC troubleshooting.
(See DTC TABLE [MZI-3.7].)
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No
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Go to the next step.
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4
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IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
• Is DTC P2270 or P2272 on the FREEZE FRAME DATA?
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Yes
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Go to the next step.
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No
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Go to the troubleshooting for the DTC on the FREEZE FRAME DATA.
(See DTC TABLE [MZI-3.7].)
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5
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INSPECT FOR EXHAUST GAS LEAKAGE
Visually inspect for exhaust gas leakage between the TWC and the rear HO2S.
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning parts.
Then go to the next step.
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No
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Go to the next step.
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6
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INSPECT REAR HO2S
• For DTC P02270 Inspect the rear HO2S(RH)
• For DTC P02272 Inspect the rear HO2S(LH)
• Is there any malfunction?
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Yes
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Inspect the related wiring harness.
If there is no malfunction, repair or replace the suspect HO2S.
Then go to the next step.
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No
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Go to the next step.
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7
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VERIFY TROUBLESHOOTING OF DTC P2270, P2272 HAS BEEN COMPLETED
• Verify that all disconnected connectors are reconnected.
• Turn the ignition switch to the ON position (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 KOEO and KOER self-test.
• Retrieve DTCs using the M-MDS.
• Is the PENDING CODE for this DTC present?
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Yes
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Replace the PCM, then go to the next step.
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No
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Go to the next step.
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8
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VERIFY AFTER REPAIR PROCEDURE
• Perform “AFTER REPAIR PROCEDURE”.
• Are any DTC present?
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Yes
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Go to the applicable DTC inspection.
(See DTC TABLE [MZI-3.7].)
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No
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Troubleshooting completed.
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