Mazda CX-9 Grand Touring 2009 Manual page 1063

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Damaged exhaust system pipe.
Damaged exhaust manifold.
Damaged muffler/tailpipe ass
POSSIBLE
CAUSE
DIAGNOSTIC PROCEDURE
DTC P0420, P0430 (MZI-3.7) DIAGNOSTIC PROCEDURE
STEP
VERIFY FREEZE FRAME DATA HAS
BEEN RECORDED
1
Has FREEZE FRAME DATA been
recorded?
VERIFY RELATED REPAIR
INFORMATION AVAILABILITY
Verify related Service Bulletins and/or
2
on-line repair information availability.
Is any related Service Bulletins
available?
VERIFY RELATED PENDING CODE
OR STORED DTCs
Turn the ignition switch off then to the
3
ON position (Engine off).
Verify related pending code or stored
DTCs.
Is other DTCs present?
INSPECT GAS LEAKAGE OF
EXHAUST SYSTEM
4
Visually inspect for exhaust gas
leakage in exhaust system.
2008 Mazda CX-9 Grand Touring
NOTE:
Internal deterioration of a catalytic converter is usually caused by
abnormal engine operation front of the catalyst. Events that can
produce higher than normal temperatures in the catalyst are particularly
suspect, such as misfiring. Incorrect HO2S signal input (e.g., rich/lean
signal when engine is operating under rich/lean conditions) can cause
an abnormal temperature increase in the catalyst. CHT sensor DTCs can
indicate that the thermostat is not operating correctly or that the engine
coolant level is not filled to specification, producing above normal
operating temperatures.
INSPECTION ACTION
Yes Go to the next step.
Record FREEZE FRAME DATA on the repair
No
order, then go to the next step.
Perform repair or diagnosis according to the
available Service Bulletins.
Yes
If the vehicle is not repaired, go to the
next step.
No Go to the next step.
Go to the appropriate DTC troubleshooting. (See
Yes
DTC TABLE [MZI-3.7].)
No Go to the next step.
Repair or replace malfunctioning exhaust parts,
Yes
then go to Step 7.
No Go to the next step.