DTC P2271, P2273 [MZI-3.7]
DTC P2271, P2273 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
DIAGNOSTIC PROCEDURE
DTC P2271, P2273 (MZI-3.7) DIAGNOSTIC PROCEDURE
7
z
Verify that all disconnected connectors
are reconnected.
z
Turn the ignition switch to the ON
position (Engine off).
z
Clear the DTC from the PCM memory
using the M-MDS.
z
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.
z
Perform the KOEO and KOER self-test.
z
Retrieve DTCs using the M-MDS.
z
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.
8
VERIFY AFTER REPAIR PROCEDURE
z
Perform "AFTER REPAIR
PROCEDURE".
(See
AFTER REPAIR PROCEDURE
[MZI-3.7]
.)
z
Are any DTC present?
Yes Go to the applicable DTC inspection. (See
DTC TABLE [MZI-3.7]
.)
No
Troubleshooting completed.
DTC P2271
P2271: Rear HO2S (RH) signal stuck rich
DTC P2273
P2273: Rear HO2S (LH) signal stuck rich
DETECTION
CONDITION
z
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
z
Rear HO2S malfunction
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA
HAS BEEN RECORDED
z
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.
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:43 AM
Page 418
© 2005 Mitchell Repair Information Company, LLC.
