DTC P0442, P0456 [MZI-3.7]
DTC P0442, P0456 (MZI-3.7) DETECTION CONDITIONS AND POSSIBLE CAUSES
z
Are there gas leakage?
5
INSPECT INSTALLATION OF FRONT
AND REAR HO2S
z
Inspect for looseness of front and rear
HO2Ss.
z
Are they it normal?
Yes Go to the next step.
No
Retighten sensor, then go to Step 7.
6
INSPECT TWC
z
Clear the DTC using the M-MDS.
z
Cycle the ignition switch off then back
to the ON position.
z
Inspect the TWC.
z
Is it normal?
Yes Go to the next step.
No
Replace the TWC, then go to the next step.
7
VERIFY TROUBLESHOOTING OF
DTC P0420, P0430 HAS BEEN
COMPLETED
z
Verify that all disconnected
connectors are reconnected.
z
Turn the ignition switch to the ON
position (Engine off).
z
Clear the DTC from the PCM memory
using the M-MDS.
z
Start the engine and run it at idle.
z
Retrieve DTCs using the M-MDS.
z
Is the PENDING CODE for this 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 DTC present?
Yes
Go to the applicable DTC inspection. (See
DTC
TABLE [MZI-3.7]
.)
No
Troubleshooting completed.
DTC P0442
P0442: Evaporative emission system leak detected (small leak)
DTC P0456
P0456: Evaporative emission system leak detected (very small leak)
z
P0442 indicates that a leak has been detected as small as 1 mm (0.04 in) in the
2008 Mazda CX-9 Grand Touring
2008 ENGINE PERFORMANCE On-Board Diagnostic (MZI-3.7) - Mazda CX-9
Microsoft
Sunday, November 15, 2009 10:08:37 AM
Page 200
© 2005 Mitchell Repair Information Company, LLC.
