Mazda CX-9 Grand Touring 2009 Manual page 1157

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Inspect the fuel tank pressure
sensor. (See FUEL TANK
PRESSURE SENSOR
6
INSPECTION [MZI-3.7] .)
Is there any malfunction?
VERIFY TROUBLESHOOTING OF
DTC P0642 HAS BEEN COMPLETED
Verify that all disconnected
connectors reconnected.
Clear the DTC from the PCM
memory using the M-MDS.
7
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 the "AFTER REPAIR
8
PROCEDURE". (See AFTER
REPAIR PROCEDURE [MZI-
3.7].)
Are any DTCs present?
DTC P0643 [MZI-3.7]
DTC P0643 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
DTC P0643
DETECTION
CONDITION
POSSIBLE CAUSE
2008 Mazda CX-9 Grand Touring
Yes
No
Yes
No
Yes
No
Sensor reference voltage circuit high
Indicates the reference voltage circuit is higher than reference voltage
maximum.
Short to power supply between fuel tank pressure sensor terminal C and PCM
terminal 1U
Fuel tank pressure sensor malfunction
Connector or terminal malfunction
Replace the evaporative hose component, then go
to the next step. (See FUEL TANK
REMOVAL/INSTALLATION [MZI-3.7] .)
Go to the next step.
Replace the PCM, then go to the next step. (See
PCM REMOVAL/INSTALLATION [MZI-
3.7] .)
Go to the next step.
Go to the applicable DTC inspection. (See DTC
TABLE [MZI-3.7].)
Troubleshooting completed.