NO.13 KNOCKING/PINGING [L3 Turbo]SM2444513
NO.13 KNOCKING/PINGING [L3 Turbo]

id0103b4801900

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 or related circuit malfunction
• Boost air temperature sensor or related circuit malfunction
• Incorrect fuel injection timing or amount
• Fuel injector malfunction
• KS or related circuit malfunction
• Ignition system malfunction
• Erratic signal from CMP sensor
• Inadequate engine compression
• Inadequate fuel pressure (high-pressure side)
• MAP sensor or related malfunction
• Wastegate valve malfunction (stuck closed)
• Charge air cooler malfunction
• Fuel pressure sensor or related circuit malfunction
• APP sensor or related circuit malfunction
• Suction control valve malfunction (built-in high pressure fuel pump)
• Exhaust system and/or 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 SERVICE PRECAUTION” and “AFTER SERVICE PRECAUTION” 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.

Diagnostic procedure

STEP

INSPECTION

RESULTS

ACTION
1
Access the ECT PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [L3 Turbo].)
Verify that the ECT PID value is less than 116 °C {241 °F} during driving.
Is the ECT PID value less than specification?
Yes
Go to the next step.
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 TWC restriction
• Charge air cooler condition (restriction or damaged)
Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
Repeat this step.
No
Go to the next step.
3
Turn the ignition switch to the ON position.
Retrieve any DTCs using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [L3 Turbo].)
Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [L3 Turbo].)
No
Go to the next step.
4
Inspect the KS.
(See KNOCK SENSOR (KS) INSPECTION [L3 Turbo].)
Is there any malfunction?
Yes
Replace the KS.
(See KNOCK SENSOR (KS) REMOVAL/INSTALLATION [L3 Turbo].)
No
Go to the next step.
5
Perform the EGR Control System Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].)
Does the EGR system operate properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
6
Perform the TP sweep inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].)
Does the electronic throttle control system work properly?
Yes
Visually inspect the throttle body (damage/scratching.)
• If normal:
― Go to the next step.
• If not:
― Repair or replace the malfunctioning part according to the inspection results.
No
Repair or replace the malfunctioning part according to the inspection results.
7
Perform the Variable Swirl Control System Operation Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].)
Does the variable swirl system work properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
8
Perform the Wastegate Control System Operation Inspection.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].)
Does the wastegate control system work properly?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
9
Perform the Spark Test.
(See ENGINE CONTROL SYSTEM OPERATION INSPECTION [L3 Turbo].)
Is a strong blue spark visible at each cylinder?
Yes
Go to the next step.
No
Repair or replace the malfunctioning part according to the inspection results.
10
Inspect the 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?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
11
Access the following PIDs using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [L3 Turbo].)
• BAT
• ECT
• MAF
• IAT
• APP1
• APP2
• TP REL
• MAP
Do the PIDs indicate the correct values under trouble condition?
(See PCM INSPECTION [L3 Turbo].)
Yes
Go to the next step.
No
Inspect the suspected parts and related wiring harness.
• If normal:
― Perform the “INTERMITTENT CONCERN TROUBLESHOOTING” procedure. (See INTERMITTENT CONCERN TROUBLESHOOTING [L3 Turbo].)
• If not:
― Repair or replace the malfunctioning part according to the inspection results.
12
Access the FUEL_PRES PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [L3 Turbo].)
Is the FUEL_PRES PID value within the specification?
(See PCM INSPECTION [L3 Turbo].)
Yes
Go to Step 16.
No
Go to the next step.
13
Is the vehicle accelerate performance normally?
Yes
Go to the next step.
No
Go to Step 15.
14
Inspect the fuel pressure sensor.
(See FUEL PRESSURE SENSOR INSPECTION [L3 Turbo].)
Is there any malfunction?
Yes
Replace the fuel delivery pipe.
(See FUEL INJECTOR REMOVAL/INSTALLATION [L3 Turbo].)
No
Go to Step 16.
15
Replace the high pressure fuel pump.
(See HIGH PRESSURE FUEL PUMP REMOVAL/INSTALLATION [L3 Turbo].)
Access the FUEL_PRES PID using the M-MDS.
(See ON-BOARD DIAGNOSTIC TEST [L3 Turbo].)
Is the FUEL_PRES PID value within the specification?
(See FUEL PRESSURE SENSOR INSPECTION [L3 Turbo].)
Yes
High pressure fuel pump or spill valve control solenoid valve (built-in high pressure fuel pump) malfunction.
• Go to Step 17.
No
Relief valve malfunction.
• Replace the fuel delivery pipe. (See FUEL INJECTOR REMOVAL/INSTALLATION [L3 Turbo].)
16
Measure the compression pressure for each cylinder.
(See COMPRESSION INSPECTION [L3 Turbo].)
Are the compression pressures within the specification?
Yes
Inspect fuel injector for each cylinder.
(See FUEL INJECTOR INSPECTION [L3 Turbo].)
Replace the fuel injector if necessary.
(See FUEL INJECTOR REMOVAL/INSTALLATION [L3 Turbo].)
No
Inspect for the following:
• Damaged valve seat
• Worn valve stem and valve guide
• Worn or stuck piston ring
• Worn piston, piston ring or cylinder
• Improper valve timing
Repair or replace the malfunctioning part according to the inspection results.
17
Verify test results.
• If normal, return to the diagnostic index to service any additional symptoms. (See SYMPTOM DIAGNOSTIC INDEX [L3 Turbo].)
• If the malfunction remains, inspect the related Service 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.