Mazda CX-9 Grand Touring 2009 Manual page 1180

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
DTC P1127 [MZI-3.7]
DTC P1127 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
DTC P1127 Exhaust temperature out of range, HO2S tests not completed
DETECTION
CONDITION
POSSIBLE
CAUSE
DIAGNOSTIC PROCEDURE
DTC P1127 (MZI-3.7) DIAGNOSTIC PROCEDURE
STEP INSPECTION
VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED
1
Has FREEZE FRAME DATA been
recorded?
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
Verify related Service Bulletins
2
availability.
Is any related Service Bulletins
available?
EXHAUST TEMPERATURE OUT OF
RANGE
NOTE:
Address all other DTCs before
proceeding.
3
Turn the ignition switch to the ON
position (Engine running)
Verify that the engine is at normal
operating temperature.
Access the PCM and monitor the
HO2S heater PID.
Is the PID state ON?
VERIFY TROUBLESHOOTING OF
DTC P1127 HAS BEEN COMPLETED
2008 Mazda CX-9 Grand Touring
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.
Engine not operating long enough prior to carrying out the KOER self-test
Exhaust system too cool
Yes Go to the next step.
Record FREEZE FRAME DATA on the repair
No
order, then go to next step.
Perform repair or diagnosis according to
available Service Bulletins.
Yes
If vehicle is not repaired, go to next step.
No Go to the next step.
Perform the KOER self-test, then go to the next
Yes step. (See KOEO/KOER SELF TEST [MZI-
3.7].)
Run the engine until the PID indicates ON.
Perform the KOER self-test, then go to the next
No
(See KOEO/KOER SELF TEST [MZI-3.7].)
ACTION
step.