ENGINE NOISE [SKYACTIV-G (US)]
ENGINE NOISE [SKYACTIV-G (US)]
SM2565591
id0103s48908s6
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Troubleshooting item |
Engine noise |
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Description
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• Engine noise from under hood.
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Possible cause
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Buzzing sound is heard from exhaust pipe during cold engine start:
• Sound occurs from drive-by-wire control, ignition control (vehicle is normal)
• Dynamic damper loose
• Exhaust system installation condition
• Intake system installation condition
Squeal, click, or chirp noise:
• Improper engine oil level
• Loose installation of solenoid valves
• Improper drive belt tension
• Generator installation
• Auto tensioner bearing malfunction
• Splash shield or under cover loose (splash water to drive belt)
Thumping/rattling or creaking sound noise:
• Improper drive belt tension
• Loose parts
• Loose fitting heater hoses vibrating the heater hose bracket protector
Hissing sound noise:
• Vacuum leakage
• Loose spark plug
• Air leakage from the intake-air system
Clattering noise:
• Loose parts
Pulsing sound is heard:
• Exhaust shutter valve malfunction (With cylinder deactivation)
Lightly tapping or rumbling noise:
• Dynamic damper loose
• Exhaust system loose
• Intake-air system loose
Other noise:
• Electric variable valve timing actuator malfunction
• Hydraulic variable valve timing actuator malfunction
• Timing chain noise
• Tappet noise
• Hydraulic lash adjuster (HLA) noise
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Possible cause
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System wiring diagram
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• Not applicable
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Connector diagram
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• Not applicable
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Diagnostic Procedure
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Step |
Inspection |
Results |
Action |
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1
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VERIFY SYMPTOM
• Verify the occurring sound.
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—
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Buzzing sound is heard from exhaust pipe during cold engine start:
• Go to the next step.
Squeal, click, or chirp sound is heard:
• Go to Step 3.
Thumping/rattling or creaking sound is heard:
• Go to Step 4.
Hissing sound is heard:
• Go to Step 5.
Clattering sound is heard:
• Go to Step 6.
Pulsing sound is heard: (With cylinder deactivation)
• Go to Step 7.
Lightly tapping or rumbling sound is heard:
• Go to Step 8.
Other noise is heard:
• Go to Step 9.
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2
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BUZZING SOUND IS HEARD FROM EXHAUST PIPE DURING COLD ENGINE START
• Verify the sound from the exhaust pipe during a cold engine start.
• Does the sound disappear after approx. 30 s have elapsed?
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Yes
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Perform the repair completion verification because the operation is normal.
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No
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Inspect the following:
• Exhaust system installation condition
• Intake system installation condition
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3
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VERIFY IF THERE IS SQUEAL, CLICK, OR CHIRP SOUND
• Inspect the following:
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to repair completion verification.
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4
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VERIFY IF THERE IS THUMPING/RATTLING OR CREAKING SOUND
• Inspect the following:
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to repair completion verification.
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5
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VERIFY IF THERE IS HISSING SOUND
• Inspect the following:
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to repair completion verification.
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6
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VERIFY IF THERE IS CLATTERING SOUND
• Inspect the location of rattle for loose parts.
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to repair completion verification.
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7
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VERIFY IF THERE IS PULSING SOUND
• Inspect the exhaust shutter valve. (See EXHAUST SHUTTER VALVE INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].)
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to repair completion verification.
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8
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VERIFY IF THERE IS LIGHTLY TAPPING OR RUMBLING SOUND
• Inspect the following:
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to repair completion verification.
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9
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VERIFY IF THERE IS KNOCK SOUND
• Is knocking noise present?
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Yes
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Perform the symptom troubleshooting “KNOCKING/PINGING-ACCELERATION/CRUISE”.
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No
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If noise comes from engine internal:
• Inspect the following:
• Repair or replace the malfunctioning location and perform the repair completion verification.
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Repair completion verification 1
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VERIFY THAT VEHICLE IS REPAIRED
• Install/connect the part removed/disconnected during the troubleshooting procedure.
• Has the malfunction symptom been eliminated?
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Yes
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Complete the symptom troubleshooting. (Explain contents of repair to customer)
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No
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Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
• If the CAN communication is normal, perform the diagnosis from Step 1.
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Repair completion verification 2
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VERIFY IF MALFUNCTION IS CAUSED BY NOT PERFORMING PCM REPROGRAMMING
• Verify repair information and verify that there is a new calibration in the PCM.
• Is there a new calibration in the PCM?
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Yes
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Perform the PCM reprogramming and verify if the malfunction symptom was corrected.
• If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
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No
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Replace the PCM.
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