Mazda 3 - 27 Spark Plug Condition [Lf]

Mazda 3 Workshop Manual – Engine + Wiring Diagrams + Diagnostic Trouble Codes
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615
High:
Replace the fuel pump unit.
(See FUEL PUMP UNIT
REMOVAL/INSTALLATION.)
5
Inspect the charcoal canister for
fuel saturation.
Is excess amount of liquid fuel
present in canister?
Yes
Replace the charcoal canister.
No
Inspect the fuel tank vent system.
• If the fuel tank vent system is normal, suggest
trying a different brand since sulfur content can
vary in different fuels.
• If the fuel tank vent system is not normal, repair or
replace the malfunctioning part.
6
Verify test results.
• If normal, return to diagnostic index to service any additional symptoms.
(See ENGINE SYMPTOM TROUBLESHOOTING [LF].)
• If malfunction remains, inspect related Service information perform repair or diagnosis.
- If vehicle repaired, troubleshooting completed.
- If vehicle not repaired or additional diagnostic information not available, replace the
PCM.
(See PCM REMOVAL/INSTALLATION [LF].)
NO.27 SPARK PLUG CONDITION [LF]
B3E010318881W29
27
SPARK PLUG CONDITION
DESCRIPTION
Incorrect spark plug condition
POSSIBLE
CAUSE
Note
• Inspecting spark plugs condition can determine whether problem is related to
a specific cylinder possibly all cylinders.
Wet/carbon stuck on specific plug:
• Spark-Weak, not visible
• Air/fuel mixture-Excessive fuel injection volume
• Compression-No compression, low compression
• Malfunction spark plug
Grayish white with specific plug:
• Air/fuel mixture-Insufficient fuel injection volume