Mazda CX-9 Grand Touring 2009 Manual page 1062

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
INSPECT IGNITION COIL
Inspect ignition coil. (See IGNITION
9
COIL INSPECTION [MZI-3.7] .)
Are there ignition coil normal?
VERIFY TROUBLESHOOTING OF
DTC P0351, P0352, P0353, P0354, P0355
and P0356 COMPLETED
Verify that all disconnected connectors
reconnected.
Clear the DTC from the PCM memory
10
using the M-MDS.
Perform the "KOEO or KOER self-
test" using the M-MDS. (See
KOEO/KOER SELF TEST [MZI-
3.7].)
Is the PENDING CODE for the DTC
present?
VERIFY AFTER REPAIR PROCEDURE
Perform "AFTER REPAIR
11
PROCEDURE". (See AFTER
REPAIR PROCEDURE [MZI-3.7].)
Are any DTCs present?
DTC P0420, P0430 [MZI-3.7]
DTC P0420, P0430 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
DTC P0420 P0420: Catalyst system efficiency below threshold (RH)
DTC P0430 P0430: Catalyst system efficiency below threshold (LH)
P0420 indicates right bank catalyst system efficiency is below the acceptable
DETECTION threshold.
CONDITION
P0430 indicates left bank catalyst system efficiency is below the acceptable
threshold.
Use of leaded fuel.
Oil contamination
Cylinder misfiring.
Damaged HO2S.
Malfunctioning CHT sensor.
Downstream HO2S wires improperly connected.
Fuel pressure too high.
2008 Mazda CX-9 Grand Touring
Yes Go to the next step.
Replace the ignition coil, then go to the next
No
Replace the PCM, then go to the next step. (See
Yes PCM REMOVAL/INSTALLATION [MZI-
3.7] .)
No
Go to the applicable DTC inspection. (See DTC
Yes
TABLE [MZI-3.7].)
No
step.
Go to the next step.
Troubleshooting completed.