Mazda CX-9 Grand Touring 2009 Manual page 1078

2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
DTC P0451 COMPLETED
Verify that all disconnected
connectors are reconnected.
Clear the DTC from the PCM
memory using the M-MDS.
Perform the "KOEO or KOER self-
8
test" using the M-MDS. (See
KOEO/KOER SELF TEST [MZI-
3.7].)
Start the engine and wait for
approx. 10s.
Is the PENDING CODE for the
DTC present?
VERIFY AFTER REPAIR
PROCEDURE
Perform the "AFTER REPAIR
9
PROCEDURE". (See AFTER
REPAIR PROCEDURE [MZI-
3.7])
Are any DTCs present?
DTC P0452 [MZI-3.7]
DTC P0452 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
DTC P0452 Fuel tank pressure sensor low input
DETECTION
CONDITION
POSSIBLE
CAUSE
2008 Mazda CX-9 Grand Touring
Yes
No
Yes
No
The PCM monitors the evaporative emission (EVAP) control system fuel tank
pressure sensor input signal to the PCM. The test fails when the signal average drops
below a minimum allowable calibrated parameter.
Fuel tank pressure sensor malfunction
Connector or terminal malfunction
Short to ground between fuel tank pressure sensor terminal A and PCM terminal 1
AB
Fuel tank pressure sensor signal circuit and ground circuit for short each other
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])
DTC troubleshooting completed.