KNOCKING/PINGING-ACCELERATION/CRUISE [SKYACTIV-G]
KNOCKING/PINGING-ACCELERATION/CRUISE [SKYACTIV-G]
SM2334614
id0103s4890000
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Troubleshooting item |
Knocking/Pinging-acceleration/cruise |
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Description
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• 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.
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Possible cause
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• Poor fuel quality
• Poor connection of KS, wiring harness
• The following information for calculating ignition timing is incorrect:
• Combustion temperature is high
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System wiring diagram
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• Not applicable
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Connector diagram
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• Not applicable
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Diagnostic Procedure
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Step |
Inspection |
Results |
Action |
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1
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VERIFY PCM DTC
• Perform the DTC inspection for the PCM. (See DTC INSPECTION.)
• Are any DTCs displayed?
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Yes
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Repair the malfunctioning location according to the applicable DTC troubleshooting.
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No
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Go to the next step.
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2
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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?
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Yes
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Symptom troubleshooting completed.
(If customer has used fuel additive, give them advice not to use it)
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No
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Go to the next step.
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3
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VERIFY IF MALFUNCTION CAUSE IS OVERHEATING
• Access the ECT PID using the M-MDS. (See PID/DATA MONITOR INSPECTION.)
• Is the ECT PID value less than 116 °C {241 °F} during driving?
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Yes
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Go to the next step.
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No
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The cause of this concern could be from the cooling system overheating.
• Perform the symptom troubleshooting “COOLING SYSTEM CONCERNS-OVERHEATING”. (See COOLING SYSTEM CONCERNS-OVERHEATING [SKYACTIV-G (US)].)
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4
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VERIFY SPARK PLUG CONDITION
• Remove all spark plugs. (See SPARK PLUG REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See SPARK PLUG REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Inspect the spark plug. (See SPARK PLUG INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See SPARK PLUG INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is there any malfunction?
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Yes
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Replace the spark plug and perform the repair completion verification.
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No
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Go to the next step.
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5
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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, evaporative hose, ventilation hose). (See VACUUM HOSE REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See VACUUM HOSE REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].) (See EMISSION SYSTEM LOCATION INDEX [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See EMISSION SYSTEM LOCATION INDEX [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].) (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is there any malfunction?
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Yes
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Repair or replace the malfunctioning location and perform the repair completion verification.
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No
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Go to the next step.
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6
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INSPECT MAP SENSOR
• Access the following PIDs using the M-MDS: (See PID/DATA MONITOR INSPECTION.)
• Measure the intake manifold vacuum when idling (no load). (See INTAKE MANIFOLD VACUUM INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See INTAKE MANIFOLD VACUUM INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Does the difference between PIDs BARO and MAP nearly match the intake manifold vacuum value?
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Yes
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Go to the next step.
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No
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Replace the MAP sensor/IAT sensor No.2 and perform the repair completion verification.
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7
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INSPECT MAF SENSOR FOR MALFUNCTION
• Inspect the applicable part. (See MASS AIR FLOW (MAF) SENSOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See MASS AIR FLOW (MAF) SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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8
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INSPECT IAT SENSOR No.2 FOR MALFUNCTION
• Inspect the applicable part. (See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See INTAKE AIR TEMPERATURE (IAT) SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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9
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INSPECT ECT SENSOR No.1 FOR MALFUNCTION
• Inspect the applicable part. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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10
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INSPECT ECT SENSOR No.2 FOR MALFUNCTION
• Inspect the applicable part. (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See ENGINE COOLANT TEMPERATURE (ECT) SENSOR INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Go to the next step.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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11
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INSPECT KS FOR MALFUNCTION
• Inspect the applicable part. (See KNOCK SENSOR (KS) INSPECTION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See KNOCK SENSOR (KS) INSPECTION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
• Is the part normal?
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Yes
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Remove the accumulated matter in the cylinder head using the following procedure:
• Carbon remover
• Overhauling
Go to repair completion verification.
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No
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Repair or replace the malfunctioning location and perform the repair completion verification.
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Repair completion verification 1
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VERIFY THAT VEHICLE IS REPAIRED
• Install/connect the part removed/disconnected during the troubleshooting procedure.
• Has the malfunction symptom been eliminated?
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Yes
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Complete the symptom troubleshooting. (Explain contents of repair to customer)
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No
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Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.
• If the CAN communication is normal, perform the diagnosis from Step 1.
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Repair completion verification 2
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VERIFY IF MALFUNCTION IS CAUSED BY NOT PERFORMING PCM REPROGRAMMING
• Verify repair information and verify that there is a new calibration in the PCM.
• Is there a new calibration in the PCM?
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Yes
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Perform the PCM reprogramming and verify if the malfunction symptom was corrected.
• If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITH CYLINDER DEACTIVATION (US))].) (See PCM REMOVAL/INSTALLATION [SKYACTIV-G (WITHOUT CYLINDER DEACTIVATION (US))].)
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No
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Replace the PCM.
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