DTC P0643 [MZI-3.7]
DTC P0643 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
6
z
Inspect the fuel tank pressure
sensor. (See
FUEL TANK
PRESSURE SENSOR
INSPECTION [MZI-3.7]
.)
z
Is there any malfunction?
Yes
Replace the evaporative hose component, then go
to the next step. (See
FUEL TANK
REMOVAL/INSTALLATION [MZI-3.7]
.)
No
Go to the next step.
7
VERIFY TROUBLESHOOTING OF
DTC P0642 HAS BEEN COMPLETED
z
Verify that all disconnected
connectors reconnected.
z
Clear the DTC from the PCM
memory using the M-MDS.
z
Perform the "KOEO or KOER self-
test" using the M-MDS. (See
KOEO/KOER SELF TEST
[MZI-3.7]
.)
z
Is the PENDING CODE for the
DTC present?
Yes
Replace the PCM, then go to the next step. (See
PCM REMOVAL/INSTALLATION [MZI-
3.7]
.)
No
Go to the next step.
8
VERIFY AFTER REPAIR
PROCEDURE
z
Perform the "AFTER REPAIR
PROCEDURE". (See
AFTER
REPAIR PROCEDURE [MZI-
3.7]
.)
z
Are any DTCs present?
Yes
Go to the applicable DTC inspection. (See
DTC
TABLE [MZI-3.7]
.)
No
Troubleshooting completed.
DTC P0643
Sensor reference voltage circuit high
DETECTION
CONDITION
z
Indicates the reference voltage circuit is higher than reference voltage
maximum.
POSSIBLE CAUSE
z
Short to power supply between fuel tank pressure sensor terminal C and PCM
terminal 1U
z
Fuel tank pressure sensor malfunction
z
Connector or terminal malfunction
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:40 AM
Page 293
© 2005 Mitchell Repair Information Company, LLC.
