MIL ON - P0442/P0455/P0456 - Mazda3 Forums : The #1 Mazda 3 Forum
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post #1 of 1 (permalink) Old 06-24-2004, 12:39 PM Thread Starter
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MIL ON - P0442/P0455/P0456

MIL ON - P0442/P0455/P0456
Applicable Models
Model Starting S/N Ending S/N
2004 MAZDA3 00000000 ZZZZZZZZ

Some vehicles may exhibit a MIL ON condition with DTCs P0442, P0455, and/or P0456 stored in memory. See the following list for possible causes.
Capture freeze frame data, then clear all DTCs. Run the WDS evaporativesystem test to confirm the leak. If vehicle fails, use the Mazda approved, EVAP Tester (Model #134-01049) to further diagnose. Activate Mode 8 to manually close the Change Over Valve (COV). Note that the purge solenoid valve is Normally Closed. Run the gas leak test and the smoke test to confirm leak location.

On Mazda3, the following conditions have been found:

STUCK OPEN PURGE SOLENOID VALVE - Confirm by removing purge solenoid control valve hose at the intake manifold, then inspect to see if smoke exits from the hose. If smoke is seen, this indicates a valve that is stuck open.
Note: If hose is not removed, smoke may not be seen anywhere, and it will appear the vehicle has no leak.

MISSING "BASKET" SEAL - A smoke test will reveal if a basket seal is missing from a quick disconnect fitting.

*** Published in M-tips newsletter Jan/Feb 2004.
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