DTC P2270, P2272 [MZI-3.7]
DTC P2270, P2272 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
DIAGNOSTIC PROCEDURE
DTC P2270, P2272 (MZI-3.7) DIAGNOSTIC PROCEDURE
11
VERIFY TROUBLESHOOTING OF
DTC P2196, P2198 HAS BEEN
COMPLETED
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 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.
12
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 P2270
P2270: Rear HO2S (RH) signal stuck lean
DTC P2272
P2272: Rear HO2S (LH) signal stuck lean
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
z
Leakage exhaust gas
STEP
INSPECTION
ACTION
VERIFY FREEZE FRAME DATA HAS
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 416
© 2005 Mitchell Repair Information Company, LLC.
