FREQUENT FRONT WHEEL SLIP [i-ACTIV AWD SYSTEM]

id0303d4138400

Outline

Troubleshooting item

Frequent front wheel slip

Description

•  Front wheels slip frequently during acceleration on low-friction road.

Possible cause

•  Tire traction performance is extremely poor for given road friction. (i-ACTIV AWD system is normal.)

•  Improper wheel alignment (i-ACTIV AWD system is normal.)

•  Rear differential oil temperature is extremely high (Fail-safe condition)

•  Differential oil temperature sensor malfunction (Fail-safe condition)

•  Coupling component temperature is extremely high (Fail-safe condition)

•  Coupling component temperature sensor malfunction (Fail-safe condition)

•  Coupling component malfunction

System wiring diagram

•  Not applicable

Connector diagram

•  Not applicable

Troubleshooting item	Frequent front wheel slip
Description	• Front wheels slip frequently during acceleration on low-friction road.
Possible cause	• Tire traction performance is extremely poor for given road friction. (i-ACTIV AWD system is normal.) • Improper wheel alignment (i-ACTIV AWD system is normal.) • Rear differential oil temperature is extremely high (Fail-safe condition) • Differential oil temperature sensor malfunction (Fail-safe condition) • Coupling component temperature is extremely high (Fail-safe condition) • Coupling component temperature sensor malfunction (Fail-safe condition) • Coupling component malfunction
System wiring diagram	• Not applicable
Connector diagram	• Not applicable

Diagnostic Procedure

Warning

• During simulation driving, vehicle stability may decrease extremely and cause an accident. Be sure to perform the simulation test driving in a safe area.

Step

Inspection

Results

Action

1

VERIFY DSC HU/CM, ELECTRONICALLY CONTROLLED BRAKE UNIT, PCM, TCM, EPS CONTROL MODULE AND ELECTRICAL SUPPLY UNIT (ESU) DTCs

•  Verify DSC HU/CM, electronically controlled brake unit, 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 (E)].)

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

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

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

(See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (EV6A-EL) (E)].)

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

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

No

Go to the next step.

2

VERIFY TIRE PRESSURE

•  Inspect tire pressure.

•  Is it within specification?

Yes

Go to the next step.

No

Adjust tire pressure, then go to the next step.

(See TIRE PRESSURE ADJUSTMENT [(E)].)

3

COMPARE WITH SAME MODEL TIRES

•  Install tires of the same model.

•  Perform simulation driving.

•  Does malfunction recur?

Yes

Go to the next step.

No

i-ACTIV AWD system is normal.

4

COMPARE WITH SAME MODEL VEHICLE

•  Install tires of malfunctioning vehicle to another same model vehicle.

•  Perform simulation driving.

•  Does malfunction recur?

Yes

i-ACTIV AWD system is normal.

No

Go to the next step.

5

INSPECT AWD SOLENOID

•  Inspect AWD solenoid.
(See AWD SOLENOID INSPECTION.)

•  Is AWD solenoid normal?

Yes

Inspect harness between AWD solenoid and electrical supply unit (ESU), then go to the next step.

No

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

(See COUPLING COMPONENT REMOVAL/INSTALLATION [(E)].)

6

INSPECT WHEEL ALIGNMENT

•  Inspect wheel alignment.
(See FRONT WHEEL ALIGNMENT [(E)].)

(See REAR WHEEL ALIGNMENT [(E)].)

•  Is it normal?

Yes

Go to the next step.

No

Adjust wheel alignment.

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 [(E)].)

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

Step	Inspection	Results	Action
1	VERIFY DSC HU/CM, ELECTRONICALLY CONTROLLED BRAKE UNIT, PCM, TCM, EPS CONTROL MODULE AND ELECTRICAL SUPPLY UNIT (ESU) DTCs • Verify DSC HU/CM, electronically controlled brake unit, 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 (E)].) (See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].) (See DTC TABLE [PCM (SKYACTIV-X)].) (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (ET6A-EL, ET6AX-EL) (E)].) (See ON-BOARD DIAGNOSTIC SYSTEM DTC TABLE [TCM (EV6A-EL) (E)].) (See DTC TABLE [ELECTRIC POWER STEERING (EPS) (E)].) (See DTC TABLE [BODY CONTROL MODULE (BCM) (E)].)
1		No	Go to the next step.
2	VERIFY TIRE PRESSURE • Inspect tire pressure. • Is it within specification?	Yes	Go to the next step.
2		No	Adjust tire pressure, then go to the next step. (See TIRE PRESSURE ADJUSTMENT [(E)].)
3	COMPARE WITH SAME MODEL TIRES • Install tires of the same model. • Perform simulation driving. • Does malfunction recur?	Yes	Go to the next step.
3		No	i-ACTIV AWD system is normal.
4	COMPARE WITH SAME MODEL VEHICLE • Install tires of malfunctioning vehicle to another same model vehicle. • Perform simulation driving. • Does malfunction recur?	Yes	i-ACTIV AWD system is normal.
4		No	Go to the next step.
5	INSPECT AWD SOLENOID • Inspect AWD solenoid. (See AWD SOLENOID INSPECTION.) • Is AWD solenoid normal?	Yes	Inspect harness between AWD solenoid and electrical supply unit (ESU), then go to the next step.
5		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See COUPLING COMPONENT REMOVAL/INSTALLATION [(E)].)
6	INSPECT WHEEL ALIGNMENT • Inspect wheel alignment. (See FRONT WHEEL ALIGNMENT [(E)].) (See REAR WHEEL ALIGNMENT [(E)].) • Is it normal?	Yes	Go to the next step.
6		No	Adjust wheel alignment. 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 [(E)].) If the CAN communication is normal, perform the diagnosis from Step 1.