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ABNORMAL NOISE AND/OR VIBRATION FROM COUPLING UNIT [i-ACTIV AWD SYSTEM]

ABNORMAL NOISE AND/OR VIBRATION FROM COUPLING UNIT [i-ACTIV AWD SYSTEM]

SM2515134

id0303d4138600

Outline

Troubleshooting item	Abnormal noise and/or vibration from coupling component
Description	• There is abnormal noise and/or vibration from coupling unit during driving.
Possible cause	• Propeller shaft is malfunctioning or attached improperly. • Engine mount or differential mount malfunction • Resonance of rotating parts on vehicle (engine, propeller shaft, rear differential, tire, etc.) • Resonance with engine vibration (mainly with exhaust system parts) • Rear differential malfunction • Coupling component malfunction
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

Diagnostic Procedure

Step	Inspection	Results	Action
1	VERIFY DSC HU/CM, PCM, TCM, EPS CONTROL MODULE AND ELECTRICAL SUPPLY UNIT (ESU) DTCs • Verify DSC HU/CM, PCM, TCM, EPS control module and electrical supply unit (ESU) DTCs using the M-MDS. (See DTC INSPECTION.) • Are there any DTCs present?	Yes	Go to applicable DTC inspection. (See DTC TABLE [DSC HU/CM (US)].) (See DTC TABLE [PCM (SKYACTIV-G (US))].) (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (EV6A-EL, EV6AX-EL) (US)].) (See DTC TABLE [ELECTRIC POWER STEERING (EPS) (US)].) (See DTC TABLE [BODY CONTROL MODULE (BCM) (US)].)
1		No	Go to next step.
2	VERIFY INSTALLATION CONDITION OF VEHICLE PARTS • Verify installation condition for following: ― Propeller shaft (including bending and joint operation) ― Center bearing ― Engine mount ― Differential mount ― Hub bearing ― Exhaust system parts ― ABS wheel-speed sensor • Are they properly installed?	Yes	Go to next step.
2		No	Repair or replace the malfunctioning location and perform the repair completion verification.
3	DETERMINE IF MALFUNCTION IS CAUSED BY REAR DIFFERENTIAL • Install tires of another brand. Note • When tires of another brand are installed, the same malfunction can occur due to conditions different from customer explanation. Be careful not to confuse it with customer complaint. • Perform simulation driving at the same engine speed, gear position, and vehicle speed that customer vehicle had malfunction. • Does the same malfunction occur?	Yes	Reinstall customer’s vehicle tire. Go to next step.
3		No	i-ACTIV AWD system is normal. Reinstall customer’s vehicle tire.
4	INSPECT REAR DIFFERENTIAL • Inspect rear differential for following: ― Backlash ― Teeth contact (See REAR DIFFERENTIAL DISASSEMBLY.) (See REAR DIFFERENTIAL ASSEMBLY.) • Are they normal?	Yes	Perform the repair completion verification.
4		No	Inspect malfunctioning part and adjust it if necessary. Perform the repair completion verification.
Repair completion verification	VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR • Install/connect the part removed/disconnected during the troubleshooting procedure. • Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. Explain to the customer what has been repaired.
Repair completion verification		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 [(US)].) If the CAN communication is normal, perform the diagnosis from Step 1.