DTC P1127 [MZI-3.5]
DTC P1127 (MZI-3.5) DETECTION CONDITION AND POSSIBLE CAUSES
DIAGNOSTIC PROCEDURE
DTC P1127 (MZI-3.5) DIAGNOSTIC PROCEDURE
PROCEDURE
z
Perform "AFTER REPAIR
PROCEDURE".
(See
AFTER REPAIR
PROCEDURE [MZI-3.5]
.)
z
Are any DTC present?
(See
DTC TABLE [MZI-3.5]
.)
No
Troubleshooting completed.
DTC P1127
Exhaust temperature out of range, HO2S tests not completed
DETECTION
CONDITION
z
The HO2S monitor uses an exhaust temperature model to determine when
the HO2S heaters are cycled ON. The test fails when the inferred exhaust
temperature is below a minimum calibrated value.
POSSIBLE CAUSE
z
Engine not operating long enough prior to carrying out the KOER self-test
z
Exhaust system too cool
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 next step.
2
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
z
Verify related Service Bulletins
availability.
z
Is any related Service Bulletins
available?
Yes
Perform repair or diagnosis according to
available Service Bulletins.
z
If vehicle is not repaired, go to next
step.
No
Go to the next step.
3
EXHAUST TEMPERATURE OUT
OF RANGE Note
NOTE:
z
Address all other DTCs before
proceeding.
Yes
Perform the KOER self-test, then go to the
next step.
(See
KOEO/KOER SELF TEST [MZI-
3.5]
.)
No
Run the engine until the PID indicates ON.
2007 Mazda CX-9 Grand Touring
2007 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.5) - CX-9
Microsoft
Sunday, November 15, 2009 9:26:36 AM
Page 342
© 2005 Mitchell Repair Information Company, LLC.