140-3 SERIES
12-123
TROUBLESHOOTING S-15
S-15 Abnormal noise is made
General causes why abnormal noise is made
• Abnormality due to defective parts
• Abnormal combustion
• Air sucked in from intake system
★ Judge if the noise is an internal noise or an external noise.
★ If the engine is not thoroughly warmed up, the engine sound
becomes slightly louder because it is operated in the low
temperature mode, but this is not an abnormality.
★ When the engine is accelerated, it enters the acceleration
mode and the engine noise is higher for 3 seconds, but this
is not an abnormality.
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