Engine Noise: Notes
ENGINE NOISE (VIN Y) DESCRIPTION AND POSSIBLE CAUSE
| Troubleshooting item |
Engine noise |
| Description |
- Engine noise from under hood.
|
| Possible cause |
Buzzing sound is heard from exhaust pipe during cold engine start:
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.
- 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
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
- Hydraulic lash adjuster (HLA) noise
WARNING:
- The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services:
- Fuel vapor is hazardous. It can easily ignite, causing serious injury and damage. Always keep sparks and flames away from fuel.
- Highly pressurized fuel may spray out if the fuel line is cut. Due to the following dangers occurring with a fuel spray, always complete the "Fuel Line Safety Procedure" to prevent the fuel from spraying. (See BEFORE SERVICE PRECAUTION [VIN Y (US)]
.)
- Fuel may cause irritation if it comes in contact with skin and eyes.
- If fuel ignites and causes a fire, it may lead to serious injury or death, and damage to property and facilities.
- Fuel is highly flammable and dangerous. Fuel line spills and leakage can cause serious injury or death, and damage to equipment. Always refer to the "Quick Release Connector Removal/Installation (fuel system)" before performing the fuel hose installation, and execute the "Fuel Leakage Inspection" after installation. (See QUICK RELEASE CONNECTOR (FUEL SYSTEM) REMOVAL/INSTALLATION [VIN Y (US)]
.) (See AFTER SERVICE PRECAUTION [VIN Y (US)]
.)
CAUTION:
- Disconnecting/connecting the quick release connector without cleaning it may possibly cause damage to the fuel pipe and quick release connector. Always clean the quick release connector joint area before disconnecting/connecting, and make sure that it is free of foreign material.
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| System wiring diagram |
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| Connector diagram |
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