TIGHT CORNER BRAKING EFFECT [i-ACTIV AWD SYSTEM]

id0303d4138500


Outline

Troubleshooting item

Tight corner braking
Description
•  Brakes seem to be applied during tight cornering while driving very slowly on paved road.
Possible cause
•  Because the coupling component locks up easily (similar to direct AWD), rotational difference between the front and rear wheels cannot be absorbed and brake-like phenomenon occurs.
•  The Off-Road Traction Assist is operating. (The Off-Road Traction Assist is activated on a paved road.) (with Off-Road Traction Assist)
•  Due to the coupling component construction, slight tight corner braking effect occurs during tight cornering on a paved road. (AWD system is normal. Compare with another same model vehicle to determine malfunction.)
•  Coupling component malfunction
•  AWD solenoid malfunction
System wiring diagram
•  Not applicable
Connector diagram
•  Not applicable


Diagnostic Procedure

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
Advise the customer not to use the Off-Road Traction Assist on paved roads. (The driving force distributed to the rear wheels is larger when the Off-Road Traction Assist is operating than when it is not, which tends to cause the tight corner braking phenomenon.)
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.
•  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 TIRE AIR PRESSURE
•  Inspect tire air pressure.
•  Is it within specification?
Yes
Go to next step.
No
Adjust tire air pressure, then go to next step.
(See TIRE PRESSURE ADJUSTMENT.)
4
INSPECT ABS WHEEL-SPEED SENSOR
•  Inspect ABS wheel-speed sensor.
•  Is it normal?
Yes
Go to next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
(See FRONT ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.)
(See REAR ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.)
5
COMPARE WITH SAME MODEL VEHICLE
•  Perform simulation driving with another same model vehicle.
•  Does malfunction recur on the same model vehicle?
Yes
i-ACTIV AWD system is normal.
No
Go to next step.
6
TRY TO REPRODUCE MALFUNCTION BY DRIVING VEHICLE WITH AWD SOLENOID CONNECTOR DISCONNECTED
•  Switch the ignition off.
•  Disconnect the AWD solenoid connector.
•  Try to reproduce the malfunction by driving the vehicle.
•  Does the malfunction recur?
Yes
Replace coupling component.
(See COUPLING COMPONENT REMOVAL/INSTALLATION.)
No
Go to next step.
7
INSPECT AWD SOLENOID
•  Inspect AWD solenoid.
•  Is AWD solenoid normal?
Yes
Inspect harness between AWD solenoid and electrical supply unit (ESU), then go to next step.
No
Repair or replace the malfunctioning location and perform the repair completion verification.
(See COUPLING COMPONENT REMOVAL/INSTALLATION.)
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.