Diagnostic procedure

WARNING: This page is about a different car, the 2005 Mazda MPV. However, it is still accessible from the selected car via links, so may be relevant.

HIGH OIL CONSUMPTION/LEAKAGE - DIAGNOSTIC PROCEDURE

STEP	INSPECTION		ACTION
1	Remove and shake PCV valve. Does PCV valve rattle?	Yes	Go to next step.
1	Remove and shake PCV valve. Does PCV valve rattle?	No	Replace PCV valve.
2	Verify following: No external leakage Proper dipstick Proper engine oil viscosity Are all items okay?	Yes	Inspect internal engine parts such as valves, valve guides, valve stem seals, cylinder head drain passage, and piston rings.
2		No	Service as necessary. Repeat Step 2.
3	Verify test results. If okay, return to diagnostic index to service any additional symptoms. If malfunction remains, inspect related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis. If vehicle is repaired, troubleshooting completed. If vehicle is not repaired or additional diagnostic information is not available, replace or reprogram PCM.