NO.13 KNOCKING/PINGING-ACCELERATION/CRUISE [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)]

id0103q8812100

13

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 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
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.
•  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.
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.

Caution
•  Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.

Related PIDs

Item (definition)

Unit/Condition

Definition

Condition/Specification (Reference)
BARO
KPa {MPa}, mBar {Bar}, psi, in H20
Barometric pressure
•  Displays BARO
ECT
°C, °F
Engine coolant temperature
•  Displays ECT
V
•  ECT is 20 °C {68 °F}: Approx. 3.10 V
•  ECT is 40 °C {104 °F}: Approx. 2.16 V
•  ECT is 60 °C {140 °F}: Approx. 1.40 V
•  ECT is 80 °C {176 °F}: Approx. 0.87 V
•  ECT is 100 °C {212 °F}: Approx. 0.54 V
IAT2
°C, °F
IAT sensor No.2 voltage
•  Displays IAT (No.2)
V
•  IAT2 is 20 °C {68 °F}: Approx. 3.57 V
•  IAT2 is 40 °C {104 °F}: Approx. 2.70 V
•  IAT2 is 60 °C {140 °F}: Approx. 1.87 V
MAF
g/Sec
Mass air flow
•  Displays MAF
V
•  Ignition switched ON (engine off) (MAF: 0.00 g/s {0 lb/min}): Approx. 1.69 V (ECT is 53 °C {127 °F})
•  Idle (after warm up) (MAF: 2.50 g/s {0.331 lb/min}): Approx. 1.89 V (ECT is 93 °C {199 °F})
•  Racing (engine speed is 2,000 rpm) (MAF: 3.80 g/s {0.503 lb/min}): Approx. 2.02 V (ECT is 95 °C {203 °F})
MAP
KPa {MPa}, mBar {Bar}, psi, in H20
Manifold absolute pressure
•  Displays MAP

Diagnostic Procedure

STEP

INSPECTION

RESULTS

ACTION
1
VERIFY PCM DTC
•  Retrieve any DTCs using the M-MDS.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
(See DTC TABLE [PCM (WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5))].)
No
Go to the next step.
2
REPLACE FUEL
•  Drain the remaining fuel in the fuel tank and add the specified fuel.
•  Leave idling for approx. 15 min to refill the hose with fuel.
•  Does the symptom disappear?
Yes
Symptom troubleshooting completed.
(If customer has used fuel additive, give them advice not to use it)
No
Go to the next step.
3
VERIFY IF MALFUNCTION CAUSE IS OVERHEATING
•  Access the ECT PID using the M-MDS.
Caution
•  While performing this step, always operate the vehicle in a safe and lawful manner.
•  When the M-MDS is used to observe monitor system status while driving, be sure to have another technician with you, or record the data in the M-MDS using the PID/DATA MONITOR AND RECORD capturing function and inspect later.
•  Is the ECT PID value less than 116 °C {241 °F} during driving?
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”.
4
VERIFY SPARK PLUG CONDITION
•  Remove all spark plugs.
•  Inspect the spark plug.
•  Is there any malfunction?
Yes
Replace the spark plug.
(See SPARK PLUG REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)
No
Go to the next step.
5
INSPECT INTAKE AIR SYSTEM FOR AIR SUCTION
•  Verify if there is air suction into the intake air system (such as between MAF sensor and intake valve, vacuum hose).
•  Is there any malfunction?
Yes
Repair or replace the malfunctioning part according to the inspection results.
No
Go to the next step.
6
INSPECT MAP SENSOR
•  Access the following PIDs using the M-MDS:
―  MAP
―  BARO
•  Measure the intake manifold vacuum when idling (no load).
•  Does the difference between PIDs BARO and MAP nearly match the intake manifold vacuum value?
Yes
Go to the next step.
No
Replace the MAP sensor/IAT sensor No.2.
(See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO.2 REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)
7
INSPECT MAF SENSOR
•  Inspect the MAF sensor.
•  Is there any malfunction?
Yes
Replace the MAF sensor/IAT sensor No.1.
(See MASS AIR FLOW (MAF) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO.1 REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)
No
Go to the next step.
8
INSPECT IAT SENSOR NO.2
•  Inspect the IAT sensor No.2 resistance.
•  Is there any malfunction?
Yes
Replace the MAP sensor/IAT sensor No.2.
(See MANIFOLD ABSOLUTE PRESSURE (MAP) SENSOR/INTAKE AIR TEMPERATURE (IAT) SENSOR NO.2 REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)
No
Go to the next step.
9
INSPECT ECT SENSOR
•  Inspect the ECT sensor resistance.
•  Is there any malfunction?
Yes
Replace the ECT sensor.
(See ENGINE COOLANT TEMPERATURE (ECT) SENSOR REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)
No
Go to the next step.
10
INSPECT KS
•  Inspect the KS.
•  Is there any malfunction?
Yes
Replace the KS, then go to the next step.
(See KNOCK SENSOR (KS) REMOVAL/INSTALLATION [WITH CYLINDER DEACTIVATION (SKYACTIV-G 2.0, SKYACTIV-G 2.5)].)
No
Remove the accumulated matter in the cylinder head using the following procedure:
•  Carbon remover
•  Overhauling
Go to the next step.
11
Verify the test results.
•  If normal, return to the diagnostic index to service any additional symptoms.
•  If a 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, replace the PCM.