Mazda Protege 5. Manual - part 111
SYMPTOM TROUBLESHOOTING [ENGINE CONTROL SYSTEM (FS)]
01–03B–37
01–03B
End Of Sie
NO.16 HIGH OIL CONSUMPTION/LEAKAGE [FS]
A3U010318881W21
Diagnostic procedure
End Of Sie
6
•
Install fuel pressure gauge between fuel filter
and fuel distributor.
•
Start engine and run it at idle.
•
Measure fuel line pressure at idle.
•
Is fuel line pressure correct at idle?
Fuel line pressure
210—250 kPa {2.1—2.6 kgf/cm
2
, 30—36 psi}
Yes
Go to next step.
No
Zero or low:
•
Inspect fuel pump circuit.
•
Inspect for open fuel pump relief valve.
•
Inspect for fuel leakage inside pressure regulator.
•
Inspect for clogged main fuel line.
High:
•
Inspect pressure regulator for high pressure cause.
•
Inspect for clogged fuel return line.
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 any restriction in exhaust system?
Yes
Inspect exhaust system.
No
Inspect EGR valve.
10
•
Verify test results.
— If okay, return to diagnostic index to service any additional symptoms.
— If malfunction remains, refer to related Service Bulletins and perform repair or diagnosis.
•
If vehicle is repaired, troubleshooting completed.
•
If vehicle is not repaired or additional diagnostic information is not available, 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, refer to related Service Bulletins and perform repair or diagnosis.
•
If vehicle is repaired, troubleshooting completed.
•
If vehicle is not repaired or additional diagnostic information is not available, replace PCM.
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