| 1 |
VERIFY SYMPTOM
- Verify the occurring sound.
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- |
Buzzing sound is heard from exhaust pipe during cold engine start:
Squeal, click, or chirp sound is heard:
Thumping/rumble or grinding sound is heard:
Hissing sound is heard:
Clattering sound is heard:
Lightly tapping or rumbling sound is heard:
Other noise is heard:
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| 2 |
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?
|
Yes |
NOTE:
- During a cold engine start, sound occurs for up to approx. 30 s with fast idle up for a drive-by-wire control and the warm-up promotion spark retard correction for ignition timing control.
Go to Step 9 because the operation is normal. |
| No |
Inspect the following:
- Exhaust system installation condition
- Intake system installation condition
- If there is any malfunction:
- Repair or replace the malfunctioning part according to the inspection results.
- If there is no malfunction:
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| 3 |
VERIFY IF THERE IS SQUEAL, CLICK, OR CHIRP SOUND
- Inspect the following:
- Engine oil level
- Solenoid valves installation
- Drive belt tension
- Generator installation
- Auto tensioner bearing damaged
- Splash shield or under cover loose
- Is there any malfunction?
|
Yes |
Repair or replace the malfunctioning part according to the inspection results. |
| No |
Go to Step 9. |
| 4 |
VERIFY IF THERE IS THUMPING/RUMBLE OR GRIND SOUND
- Inspect the following:
- Drive belt tension
- Loose parts in engine compartment
- Loose fitting heater hoses vibrating the heater hose bracket protector
- Is there any malfunction?
|
Yes |
Repair or replace the malfunctioning part according to the inspection results. |
| No |
Go to Step 9. |
| 5 |
VERIFY IF THERE IS HISS SOUND
- Inspect the following:
- Vacuum leakage
- Spark plug loose
- Intake-air system leakage
- Is there any malfunction?
|
Yes |
Repair or replace the malfunctioning part according to the inspection results. |
| No |
Go to Step 9. |
| 6 |
VERIFY IF THERE IS RATTLE SOUND
- Inspect the location of rattle for loose parts.
- Is there any malfunction?
|
Yes |
Repair or replace the malfunctioning part according to the inspection results. |
| No |
Go to Step 9. |
| 7 |
VERIFY IF THERE IS RAP OR ROAR SOUND
- Inspect the following:
- Exhaust system installation condition
- Intake system installation condition
- Is there any malfunction?
|
Yes |
Repair or replace the malfunctioning part according to the inspection results. |
| No |
Go to Step 9. |
| 8 |
VERIFY IF THERE IS KNOCK SOUND
- Is knocking noise present?
|
Yes |
Perform the symptom troubleshooting "NO. 13 KNOCKING/PINGING-ACCELERATION/CRUISE".
(See NO. 13 KNOCKING/PINGING-ACCELERATION/CRUISE .) |
| No |
If noise comes from engine internal:
- Inspect the following:
- Timing chain
- Hydraulic lash adjuster (HLA) noise
- Electric variable valve timing actuator
- Hydraulic variable valve timing actuator
- Repair or replace the malfunctioning part according to the inspection results.
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| 9 |
Verify the test results.
- If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX .)
- If the malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform repair or diagnosis.
- If the vehicle is repaired, troubleshooting is completed.
- If the vehicle is not repaired or additional diagnostic information is not available, reprogram the PCM if a later calibration is available. Retest.
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