DTC P2270, P2272 [MZI-3.5]
DTC P2270, P2272 (MZI-3.5) DETECTION CONDITION AND POSSIBLE CAUSES
DIAGNOSTIC PROCEDURE
DTC P2270, P2272 (MZI-3.5) DIAGNOSTIC PROCEDURE
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?
No
Go to the next step.
12
VERIFY AFTER REPAIR
PROCEDURE
z
Perform "AFTER REPAIR
PROCEDURE".
(See
AFTER REPAIR
PROCEDURE [MZI-3.5]
.)
z
Are any DTC present?
Yes
Go to the applicable DTC inspection.
(See
DTC TABLE [MZI-3.5]
.)
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 lest
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
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.
2
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
Yes
Perform repair or diagnosis according to
the available Service Bulletins.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:26:39 AM
Page 454
© 2005 Mitchell Repair Information Company, LLC.