Symptom Troubleshooting - Engine (VIN Y): Knocking/Pinging-Acceleration/Cruise: Notes
KNOCKING/PINGING-ACCELERATION/CRUISE (VIN Y) DESCRIPTION AND POSSIBLE CAUSE
| Troubleshooting item |
Knocking/Pinging-acceleration/cruise |
| Description |
- Abnormal combustion occurs under the condition such as the temperature in the combustion chamber is too high resulting in abnormal noise.
- Knocking sound occurs from the engine compartment during acceleration.
|
| Possible cause |
- Poor fuel quality
- Fuel RON is not specified
- Excessive cleaning agents added in fuel
- Poor connection of KS, wiring harness
- The following information for calculating ignition timing is incorrect:
- KS signal
- ECT sensor No. 1 signal
- ECT sensor No. 2 signal
- IAT sensor No. 2 (integrated in MAP sensor) signal
- MAF sensor signal
- Air suction in intake-air system
- MAP sensor signal
- Combustion temperature is high
- Cooling system malfunction
- Carbon accumulation
- Use of non-genuine spark plug
- EGR system malfunction
- Water-cooled charge air cooler system malfunction
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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