Mazda 6 2002, Workshop Manual

Page: 344 / 1248

F–214
TROUBLESHOOTING
End Of Sie
NO.16 HIGH OIL CONSUMPTION/LEAKAGE
A6E398018881W18
Diagnostic procedure
End Of Sie
5 Is strong blue spark visible at each disconnected
high-tension lead while cranking engine? Yes Inspect for following:
•
Spark plugs malfunction
•
Improperly installed CMP sensor
•
Damage of trigger wheel on camshaft
•
Open or short circuit on CMP sensor
•
Open or short circuit between CMP sensor and
PCM terminal 2J or 2M
Repair or replace malfunctioning parts.
If okay, go to next step.
No Inspect following:
•
High-tension leads
•
Ignition coil and connector
6 Install fuel pressure gauge between fuel pipe
and fuel distributor.
Start engine and run it at idle.
Measure fuel line pressure at idle.
Is fuel line pressure correct at idle?
(See
F–20 FUEL LINE PRESSURE
INSPECTION )
Yes Go to next step.
No Zero or low:
Inspect for clogged fuel line.
If okay, replace fuel pump unit.
High:
Replace fuel pump unit.
7 Remove and shake PCV valve.
Does PCV valve rattle? Yes Go to next step.
No Replace PCV valve.
8 Inspect for fuel saturation inside charcoal
canister.
Is excess amount of liquid fuel present in
canister? Yes Replace charcoal canister.
No Inspect fuel tank vent system.
Then, go to next step.
9 Is there restriction in exhaust system? Yes Inspect exhaust system.
No Inspect EGR system.
(See
F–233 EGR Control System Inspection .)
10 Inspect threeway catalytic converter.
(See
F–41 THREE-WAY CATALYTIC
CONVERTER (TWC) INSPECTION .)
Is threeway catalytic converter okay?
Yes Inspect EGR system.
(See
F–233 EGR Control System Inspection .)
No Replace threeway catalytic converter.
11 Verify test results.
•
If okay, return to diagnostic index to service any additional symptoms.
•
If malfunction remains, replace PCM.
STEP INSPECTION RESULTS ACTION
16 HIGH OIL CONSUMPTION/LEAKAGE
DESCRIPTION Oil consumption is excessive.
POSSIBLE CAUSE
•
PCV valve malfunction
•
Improper dipstick
•
Improper engine oil viscosity
•
Engine internal parts malfunction
STEP INSPECTION RESULTS ACTION
1 Remove and shake PCV valve.
Does PCV valve rattle? Yes Go to next step.
No Replace PCV valve.
2 Inspect for following:
•
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.
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, replace PCM.