| 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/rumble or grinding sound noise:
- Improper drive belt tension
- Loose parts
- Loose fitting heater hoses vibrating the heater hose bracket protector
Hiss sound noise:
- Vacuum leakage
- Loose spark plug
- Air leakage from the intake-air system
Rattle noise:
Rap or roar 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.
- Fuel line spills and leakage are dangerous. Fuel can ignite and cause serious injury or death and damage. Fuel can also irritate skin and eyes. To prevent this, always complete "BEFORE SERVICE PRECAUTION" and "AFTER SERVICE PRECAUTION" described in this Repair Information. (See BEFORE SERVICE PRECAUTION
.) (See AFTER SERVICE PRECAUTION
.)
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.
|