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

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	• The Off-Road Traction Assist is operating. (Due to the Off-Road Traction Assist operation, controls that prioritize the road handling ability are performed, which tends to cause vibration and booming noise.) (with Off-Road Traction Assist) • Abnormal noise and/or vibration from coupling component during driving • 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

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

• The Off-Road Traction Assist is operating. (Due to the Off-Road Traction Assist operation, controls that prioritize the road handling ability are performed, which tends to cause vibration and booming noise.) (with Off-Road Traction Assist)

• Abnormal noise and/or vibration from coupling component during driving

• 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

Step	Inspection	Results	Action
1	VERIFY OFF-ROAD TRACTION ASSIST OPERATION CONDITION (WITH OFF-ROAD TRACTION ASSIST) • Verify with the customer the Off-Road Traction Assist operation condition when the malfunction occurred. • Was the Off-Road Traction Assist activated when the malfunction occurred?	Yes	Explain to the customer that vibration and booming noise increase because the road handling ability is prioritized when the Off-Road Traction Assist is operating compared to when it is not.
No	Go to next step.
2	VERIFY ELECTRONICALLY CONTROLLED BRAKE UNIT, PCM, TCM, EPS CONTROL MODULE AND BODY CONTROL MODULE (BCM) DTCs • Verify electronically controlled brake unit, PCM, TCM, EPS control module and body control module (BCM) DTCs using the M-MDS. (See DTC INSPECTION.) • Are there any DTCs present?	Yes	Go to applicable DTC inspection. (See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].) (See DTC TABLE [PCM (SKYACTIV-G)].) (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (ET6A-EL, ET6AX-EL)].) (See DTC TABLE [ELECTRIC POWER STEERING (EPS) CONTROL MODULE].) (See DTC TABLE [BODY CONTROL MODULE (BCM)].)
No	Go to next step.
3	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.
No	Repair or replace the malfunctioning location and perform the repair completion verification.
4	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.
No	i-ACTIV AWD system is normal. Reinstall customer’s vehicle tire.
5	INSPECT REAR DIFFERENTIAL • Inspect rear differential for following: ― Backlash ― Teeth contact (See REAR DIFFERENTIAL DISASSEMBLY.) (See REAR DIFFERENTIAL ASSEMBLY.) • Are they normal?	Yes	Replace the coupling component and perform the repair completion verification. (See COUPLING COMPONENT REMOVAL/INSTALLATION.)
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.
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.) If the CAN communication is normal, perform the diagnosis from Step 1.

Step

Inspection

Results

Action

VERIFY OFF-ROAD TRACTION ASSIST OPERATION CONDITION (WITH OFF-ROAD TRACTION ASSIST)

• Verify with the customer the Off-Road Traction Assist operation condition when the malfunction occurred.

• Was the Off-Road Traction Assist activated when the malfunction occurred?

Yes

Explain to the customer that vibration and booming noise increase because the road handling ability is prioritized when the Off-Road Traction Assist is operating compared to when it is not.

Go to next step.

VERIFY ELECTRONICALLY CONTROLLED BRAKE UNIT, PCM, TCM, EPS CONTROL MODULE AND BODY CONTROL MODULE (BCM) DTCs

• Verify electronically controlled brake unit, PCM, TCM, EPS control module and body control module (BCM) DTCs using the M-MDS.

(See DTC INSPECTION.)

• Are there any DTCs present?

Yes

Go to applicable DTC inspection.

(See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)

(See DTC TABLE [PCM (SKYACTIV-G)].)

(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (ET6A-EL, ET6AX-EL)].)

(See DTC TABLE [ELECTRIC POWER STEERING (EPS) CONTROL MODULE].)

(See DTC TABLE [BODY CONTROL MODULE (BCM)].)

Go to next step.

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.

Repair or replace the malfunctioning location and perform the repair completion verification.

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.

i-ACTIV AWD system is normal.

Reinstall customer’s vehicle tire.

INSPECT REAR DIFFERENTIAL

• Inspect rear differential for following:

― Backlash

― Teeth contact

(See REAR DIFFERENTIAL DISASSEMBLY.)

(See REAR DIFFERENTIAL ASSEMBLY.)

• Are they normal?

Yes

Replace the coupling component and perform the repair completion verification.

(See COUPLING COMPONENT REMOVAL/INSTALLATION.)

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.

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.)

If the CAN communication is normal, perform the diagnosis from Step 1.