DTC P0040, P0041 [MZI-3.7]
DTC P0040, P0041 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
DTC P0040, P0041 (MZI-3.7) DIAGNOSTIC PROCEDURE
7
z
Perform the "AFTER REPAIR
PROCEDURE".
(See
AFTER REPAIR PROCEDURE
[MZI-3.7]
.)
z
Are any DTCs present?
Yes Go to the applicable DTC inspection. (See
DTC TABLE [MZI-3.7]
.)
No
Troubleshooting completed.
DTC P0040
P0040: Front HO2S (LH/RH) signals swapped
DTC P0041
P0041: Rear HO2S (LH/RH) signals swapped
DETECTION
CONDITION
z
P0040 indicates that during KOER testing, the front HO2S signal(s)
response for a fuel shift to the correct engine bank was not indicated.
z
P0041 indicates that during KOER testing, the rear HO2S signal(s)
response for a fuel shift to the correct engine bank was not indicated.
POSSIBLE CAUSE
z
Crossed HO2S harness connectors.
z
Crossed wiring at HO2S harness connectors.
z
Crossed wiring at PCM harness connector.
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
z
Verify related Service Bulletins and/or on-
line repair information availability.
z
Is any related Service Bulletins available?
Yes
Perform repair or diagnosis according to
the available Service Bulletins.
z
If the vehicle is not repaired, go to
the next step.
No
Go to the next step.
3
INSPECT HO2S WIRING HARNESS
CONNECTORS
z
For P0040, visually inspect the vehicle
front HO2S wiring harness connector (s) for
any indication of crossed wires (Also,
stretched or incorrectly mounted wiring
harnesses).
z
For P0041, visually inspect the vehicle rear
Yes Repair if necessary.
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:34 AM
Page 43
© 2005 Mitchell Repair Information Company, LLC.
