DTC P2271, P2273 [MZI-3.7 (PCM CONNECTOR (2 TYPES))]

id0102e3882500

DTC P2271

DTC P2273

P2271: Rear HO2S (RH) signal stuck rich

P2273: Rear HO2S (LH) signal stuck rich
DETECTION CONDITION
•  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.
POSSIBLE CAUSE
•  Rear HO2S malfunction
•  PCM malfunction

Diagnostic procedure

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 SERVICE INFORMATION AVAILABILITY
•  Verify related Service Information availability.
•  Is any related Service Information available?
Yes
Perform repair or diagnosis according to the available Service Information.
•  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
•  Turn the ignition switch 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 (PCM CONNECTOR (2 TYPES))].)
No
Go to the next step.
4
IDENTIFY TRIGGER DTC FOR FREEZE FRAME DATA
•  Is DTC P2271 or P2273 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 (PCM CONNECTOR (2 TYPES))].)
5
INSPECT REAR HO2S
•  For DTC P2271 Inspect the rear HO2S(RH)
•  For DTC P2273 Inspect the rear HO2S(LH)
(See REAR HEATED OXYGEN SENSOR (HO2S) INSPECTION [MZI-3.7 (PCM CONNECTOR (2 TYPES))].)
•  Is there any malfunction?
Yes
Inspect the related wiring harnesses.
If there is no malfunction, replace the HO2S.
(See REAR HEATED OXYGEN SENSOR (HO2S) REMOVAL/INSTALLATION [MZI-3.7 (PCM CONNECTOR (2 TYPES))].)
No
Go to the next step.
6
VERIFY TROUBLESHOOTING OF DTC P2271, P2273 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?
Yes
Replace the PCM, then go to the next step.
(See PCM REMOVAL/INSTALLATION [MZI-3.7].)
No
Go to the next step.
7
VERIFY AFTER REPAIR PROCEDURE
•  Perform “AFTER REPAIR PROCEDURE”
•  Are any DTC present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [MZI-3.7 (PCM CONNECTOR (2 TYPES))].)
No
Troubleshooting completed.