NO.13 KNOCKING/PINGING [L3 Turbo]


13	KNOCKING/PINGING
DESCRIPTION	Sound is produced when air/fuel mixture is ignited by something other than a spark plug (e.g., hot spot in the combustion chamber).
POSSIBLE CAUSE	• Poor fuel quality • Engine overheating due to cooling system malfunction • Variable swirl valve stuck closed • Improper operation of electronic throttle system • Air leakage or restriction from intake-air system • ECT sensor or related circuit malfunction • MAF sensor or related circuit malfunction • IAT sensor No.1 or related circuit malfunction • IAT sensor No.2 or related circuit malfunction • Incorrect fuel injection timing or amount • Fuel injector malfunction • Knock sensor or related circuit malfunction • Ignition system malfunction • Erratic signal from CMP sensor • Inadequate engine compression • Inadequate fuel pressure (high-pressure side) • Manifold absolute pressure (MAP) sensor or related malfunction • Wastegate valve malfunction (stuck closed) • Charge air cooler malfunction • Fuel pressure sensor or related circuit malfunction • Accelerator position sensor or related circuit malfunction • Suction control valve malfunction (built-in high pressure fuel pump) • Exhaust system and/or three-way catalytic converter (TWC) restriction • EGR 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. • 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 REPAIR ROCEDURE" and "AFTER REPAIR PROCEDURE" described in this manual. (See BEFORE SERVICE PRECAUTION [L3 Turbo].) (See AFTER SERVICE PRECAUTION [L3 Turbo].) 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.


STEP	INSPECTION	RESULTS	ACTION
1	Connect the WDS or equivalent to the DLC-2. Access the ECT PID. Verify that the ECT PID is less than 116°C {241°F} during driving. Is ECT PID less than specified?	Yes	Go to the next step.
1		No	The cause of this concern could be from the cooling system overheating. Perform the symptom troubleshooting "NO.17 COOLING SYSTEM CONCERNS - OVERHEATING." (See NO.17 COOLING SYSTEM CONCERNS-OVERHEATING [L3 Turbo].)
2	Inspect for the following: • Air leakage or restriction from intake-air system • Fuel quality (proper octane, contamination, winter/summer blend) • Exhaust system and/or three-way catalytic converter (TWC) restriction • Charge air cooler condition (restriction or damaged) Are all items normal?	Yes	Go to the next step.
2		No	Service if necessary. Repeat Step 2.
3	Perform the self-test function using the WDS or equivalent. Turn the ignition switch to the ON position. Retrieve any DTCs. Is a DTC displayed?	Yes	DTC is displayed: Go to the appropriate DTC test. (See DTC TABLE [L3 Turbo].)
3		No	No DTC is displayed: Go to the next step.
4	Inspect the knock sensor. (See KNOCK SENSOR (KS) INSPECTION [L3 Turbo].) Is the knock sensor normal?	Yes	Go to the next step.
4		No	Replace the knock sensor. (See KNOCK SENSOR (KS) REMOVAL/INSTALLATION [L3 Turbo].)
5	Perform the EGR system operation inspection. (See EGR Control System Inspection.) Does the EGR system operate properly?	Yes	Go to the next step.
5		No	Inspect or replace the malfunctioning parts, according to the inspection results.
6	Perform the TP sweep inspection. (See Electronic Throttle Control System Inspection.) Does the electronic throttle control system work properly?	Yes	Visually inspect the throttle body (damaged/scratching.) If normal, go to the next step.
6		No	Inspect or replace the malfunctioning parts, according to the inspection results.
7	Perform the Variable Swirl Control System Operation Inspection. (See Variable Swirl System Operation Inspection.) Does the variable swirl system work properly?	Yes	Go to the next step.
7		No	Inspect or replace the malfunctioning parts, according to the inspection results.
8	Perform the Wastegate Control System Operation Inspection. (See Wastegate Control System Operation Inspection.) Does the variable swirl system work properly?	Yes	Go to the next step.
8		No	Inspect or replace the malfunctioning parts, according to the inspection results.
9	Perform the spark test. (See Spark Test.) Is a strong blue spark visible at each cylinder?	Yes	Go to the next step.
9		No	Inspect or replace the malfunctioning parts, according to the inspection results.
10	Inspect CMP and CKP sensor for the following; • Installation condition (See CAMSHAFT POSITION (CMP) SENSOR REMOVAL/INSTALLATION [L3 Turbo].) (See CRANKSHAFT POSITION (CKP) SENSOR REMOVAL/INSTALLATION [L3 Turbo].) • Damaged trigger wheel and camshaft • Open or short circuit in the wiring harnesses Is there any malfunction detected?	Yes	Repair or replace the malfunctioning part according to the inspection results.
10		No	Go to the next step.
11	Connect the WDS or equivalent to the DLC-2. Access and monitor the following PIDs using the data monitor function. • ECT • MAF • IAT • IAT2 • APP • TP • MAP Do the PIDs indicate correct values under trouble condition? (See Using the WDS or Equivalent.)	Yes	Go to the next step.
11		No	Inspect and repair or replace suspected parts and the related harnesses. If the malfunction remains, perform the intermittent concern troubleshooting procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [L3 Turbo].)
12	Access and monitor FUEL_PRES PID. Is the FUEL_PRES PID value within the specification? (See Using the WDS or Equivalent.)	Yes	Go to Step 16.
12		No	Go to the next step.
13	Is the vehicle accelerate performance normally?	Yes	Go to the next step.
13	Is the vehicle accelerate performance normally?	No	Go to the Step 15.
14	Inspect the fuel pressure sensor. (See FUEL PRESSURE SENSOR INSPECTION [L3 Turbo].) Is the fuel pressure sensor normal?	Yes	Go to Step 16.
14		No	Replace the delivery pipe.
15	Replace the high pressure fuel pump. Monitor FUEL_PRES PID. Is the FUEL_PRES PID value within the specified? (See FUEL PRESSURE SENSOR INSPECTION [L3 Turbo].)	Yes	Troubleshooting is completed. Go to Step 17.
15		No	Go to the next step.
16	Measure compression pressure for each cylinder. (See COMPRESSION INSPECTION [L3 Turbo].) Are compression pressure within the specified?	Yes	Inspect fuel injector for each cylinder. (See FUEL INJECTOR INSPECTION [L3 Turbo].)
16		No	Inspect following: • Damaged valve seat • Worn valve stem and valve guide • Worn or stuck piston ring • Worn piston, piston ring or cylinder • Improper valve timing Service as necessary.
17	Verify test results. • If normal, return to the diagnostic index to service any additional symptoms. • If a malfunction remains, inspect the related Service Bulletins and/or On-line Repair Information and perform the 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.