17 Cooling System Concerns-Overheating [Z6] - Mazda 3 Workshop Manual

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
• PCV valve malfunction
• Improper dipstick
POSSIBLE CAUSE
• Improper engine oil viscosity
• Engine internal parts malfunction
Diagnostic procedure
STEP INSPECTION
Remove and shake
the PCV valve.
1
Does the PCV valve
rattle?
Inspect for the
following:
• External leakage
• Proper dipstick
2
• Proper engine oil
viscosity
Are all the items
normal?
Verify test results.
• If normal, return to diagnostic index to service any additional symptoms.
(See ENGINE SYMPTOM TROUBLESHOOTING
• If malfunction remains, inspect related Service information perform repair or diagnosis.
3
- If vehicle repaired, troubleshooting completed.
- If vehicle not repaired or additional diagnostic information not available, replace the
PCM.
(See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION
NO.17 COOLING SYSTEM CONCERNS-OVERHEATING
17 COOLING SYSTEM CONCERNS -OVERHEATING
Engine runs at higher than normal temperature/overheats.
DESCRIPTION
• Improper coolant level
POSSIBLE CAUSE
• Blown fuses
Downloaded from
RESULTS
Yes Go to the next step.
No Replace the PCV valve.
Inspect the internal engine parts such as valves, valve
Yes guides, valve stem seals, cylinder head drain passage, and
piston rings.
Service if necessary.
No
Repeat Step 2.
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