Mazda CX-9 Grand Touring. Manual — part 290
DTC P0643 [MZI-3.7]
DTC P0643 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
6
Inspect the fuel tank pressure
sensor. (See FUEL TANK
PRESSURE SENSOR
INSPECTION [MZI-3.7] .)
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
Verify that all disconnected
connectors reconnected.
Clear the DTC from the PCM
memory 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?
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
Perform the "AFTER REPAIR
PROCEDURE". (See AFTER
REPAIR PROCEDURE [MZI-
3.7].)
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
Indicates the reference voltage circuit is higher than reference voltage
maximum.
POSSIBLE CAUSE
Short to power supply between fuel tank pressure sensor terminal C and PCM
terminal 1U
Fuel tank pressure sensor malfunction
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.
DIAGNOSTIC PROCEDURE
DTC P0643 (MZI-3.7) DIAGNOSTIC PROCEDURE
STEP
INSPECTION
ACTION
1
VERIFY FREEZE FRAME DATA
HAS BEEN RECORDED
Has FREEZE FRAME DATA been
recorded?
Yes Go to the next step.
No
Record FREEZE FRAME DATA on the repair
order, then go to the next step.
VERIFY RELATED REPAIR
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 294
© 2005 Mitchell Repair Information Company, LLC.
2
INFORMATION AVAILABILITY
Verify related Service Bulletins
and/or on-line repair information
availability.
Is any related Service Bulletins
available?
Yes
Perform repair or diagnosis according to the
available Service Bulletins.
If the vehicle is not repaired, go to the next
step.
No
Go to the next step.
3
INSPECT FUEL TANK PRESSURE
SENSOR CONNECTOR FOR POOR
CONNECTION
Turn the ignition switch off.
Disconnect the fuel tank pressure
sensor connector.
Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
Are there any malfunction?
Yes Repair or replace suspected part, then go to Step 7.
No
Go to the next step.
4
INSPECT PCM CONNECTOR FOR
POOR CONNECTION
Turn the ignition switch off.
Disconnect the PCM connector.
Inspect for poor connection (such as
damaged/pulled-out pins, corrosion).
Are there any malfunction?
Yes Repair or replace suspected part, then go to Step 7.
No
Go to the next step.
5
INSPECT FUEL TANK PRESSURE
SENSOR CIRCUIT FOR SHORT TO
POWER SUPPLY
Turn the ignition switch to the ON
position (Engine off).
Measure the voltage continuity
between fuel tank pressure sensor
terminal C (wiring harness-side) and
body ground.
Is the voltage B+?
Yes Repair or replace suspected part, then go to Step 7.
No
Go to the next step.
6
INSPECT FUEL TANK PRESSURE
SENSOR
Inspect the fuel tank pressure sensor.
(See FUEL TANK PRESSURE
SENSOR INSPECTION [MZI-
3.7] .)
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.
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 295
© 2005 Mitchell Repair Information Company, LLC.
DTC P0645 [MZI-3.7]
DTC P0645 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
7
VERIFY TROUBLESHOOTING OF
DTC P0643 HAS BEEN COMPLETED
Verify that all disconnected
connectors reconnected.
Clear the DTC from the PCM
memory 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?
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
Perform the "AFTER REPAIR
PROCEDURE". (See AFTER
REPAIR PROCEDURE [MZI-
3.7].)
Are any DTCs present?
Yes
Go to the applicable DTC inspection. (See DTC
TABLE [MZI-3.7].)
No
Troubleshooting completed.
DTC P0645
A/C relay control circuit
DETECTION
CONDITION
Monitors the A/C relay control circuit output from the PCM. The test fails when the
PCM grounds the A/C relay control circuit, excessive current draw is detected on the
A/C relay control circuit; or, with the A/C relay control circuit not grounded by the
PCM, voltage is not detected on the A/C relay control circuit (the PCM expects to
detect vehicle power voltage coming through the A/C relay coil to the A/C circuit).
POSSIBLE
CAUSE
A/C relay malfunction
Connector or terminal malfunction
Open circuit in wiring between main relay terminal No.1 D and A/C relay terminal A
Open circuit in wiring between A/C relay terminal E and PCM terminal IN
Short to ground in wiring between A/C relay terminal E and PCM terminal 1N
Short to power supply between A/C relay terminal E and PCM terminal 1N
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 296
© 2005 Mitchell Repair Information Company, LLC.
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