ENGINE NOISE [SKYACTIV-D]

id0103s5890800

Troubleshooting item	ENGINE NOISE
Description	•  Engine noise from under bonnet.
Possible cause	•  PCM DTC is stored. •  Air cleaner malfunction (deformity or non-genuine part installed) •  Intake air system malfunction (air suction, leakage, perforation) •  Exhaust gas leakage from exhaust system •  Slippage of belts for engine accessories •  Turbocharger malfunction (interference with housing of turbo rotational mechanism) •  Trapped air in engine oil pump •  Mechanical (engine) malfunction ―  Improper engine compression ―  Improper valve timing Warning •  The following troubleshooting flow chart contains the fuel system diagnosis and repair procedures. Read the following warnings before performing the fuel system services: ―  Always keep sparks and flames away from fuel. Fuel can be easily ignited which could cause serious injury or death, and damage to equipment. ―  Fuel line spills and leakage from the pressurized fuel system are dangerous. Fuel can ignite and cause serious injury or death, and damage to property and facilities. Fuel can also irritate skin and eyes. To prevent this, always complete the "Fuel Line Safety Procedure", while referring to the "BEFORE SERVICE PRECAUTION". (See BEFORE SERVICE PRECAUTION [SKYACTIV-D 1.8].) ―  Fuel is highly flammable and dangerous. Fuel line spills and leakage can cause serious injury or death, and damage to equipment. When installing the fuel hose, always refer to the "AFTER SERVICE PRECAUTION" and perform the "Fuel Hose Installation Procedure". (See AFTER SERVICE PRECAUTION [SKYACTIV-D 1.8].)
System wiring diagram	•  Not applicable
Connector diagram	•  Not applicable

Diagnostic Procedure

Step	Inspection	Results	Action
1	VERIFY PCM DTC •  Retrieve PCM DTCs using the M-MDS. (See DTC INSPECTION.) •  Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [PCM (SKYACTIV-D)].)
		No	Go to the next step.
2	VERIFY IF MALFUNCTION IS CAUSED BY TRAPPED AIR IN ENGINE OIL PUMP •  Start the engine. •  Maintain the engine speed at 2,200 rpm or more for 10 s. •  Has the malfunction symptom been eliminated?	Yes	Explain to the customer that a malfunction occurred due to trapped air in the engine oil pump.
		No	Go to the next step.
3	INSPECT AIR CLEANER FOR DEFORMITY OR NON-GENUINE AIR CLEANER INSTALLATION •  Remove the air cleaner. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].) •  Verify the symptom. •  Does the symptom disappear?	Yes	Explain to the customer that a malfunction occurred due to a deformed air cleaner or installation of a non-genuine air cleaner. •  Go to repair completion verification.
		No	Install the removed parts correctly, then go to the next step. (See INTAKE-AIR SYSTEM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
4	INSPECT INTAKE AIR SYSTEM •  Visually inspect for air suction, leakage and perforation in the intake air system. •  Is the intake air system normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.
5	INSPECT EXHAUST SYSTEM FOR LEAKAGE •  Visually inspect for exhaust gas leakage from the exhaust system. •  Is the exhaust system normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.
6	INSPECT SLIPPAGE OF BELTS FOR ENGINE ACCESSORIES •  Inspect slippage of the belts for the engine accessories. (See DRIVE BELT INSPECTION [SKYACTIV-D 1.8].) (See DRIVE BELT AUTO TENSIONER INSPECTION [SKYACTIV-D 1.8].) •  Are the belts for the engine accessories normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning part according to the inspection results, then go to repair completion verification.
7	INSPECT TURBOCHARGER WITH VARIABLE TURBINE GEOMETRY FOR MALFUNCTION •  Inspect the applicable part. (See TURBOCHARGER WITH VARIABLE TURBINE GEOMETRY INSPECTION [SKYACTIV-D 1.8].) •  Is the part normal?	Yes	Go to the next step.
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See TURBOCHARGER WITH VARIABLE TURBINE GEOMETRY REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
8	INSPECT ENGINE COMPRESSION •  Inspect the engine compression. (See COMPRESSION INSPECTION [SKYACTIV-D 1.8].) •  Are compression pressures within specification?	Yes	Go to repair completion verification.
		No	Go to the next step.
9	INSPECT FOR MALFUNCTION DUE TO DEVIATED VALVE TIMING •  Inspect the valve timing (timing chain installation condition). (See TIMING CHAIN REMOVAL/INSTALLATION [SKYACTIV-D 1.8].) •  Is the valve timing normal?	Yes	Go to the next step.
		No	Adjust the valve timing to the correct timing, then go to the next step.
Repair completion verification 1	VERIFY THAT VEHICLE IS REPAIRED •  Install/connect the part removed/disconnected during the troubleshooting procedure. •  Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. (Explain contents of repair to customer)
		No	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [(E)].) •  If the CAN communication is normal, perform the diagnosis from Step 1. ―  If the malfunction recurs, go to the next step.
Repair completion verification 2	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?	Yes	Perform the PCM reprogramming and verify if the malfunction symptom was corrected. •  If the malfunction recurs, replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)
		No	Replace the PCM. (See PCM REMOVAL/INSTALLATION [SKYACTIV-D 1.8].)