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Inspection Procedure 3: The Tight Corner Braking Phenomenon* Appears with the drive mode selector in the AWD ECO or AWD AUTO Position.
 
 
note
  • *Tight corner braking phenomenon: When a AWD vehicle makes sharp cornering in a paved road at low speed (ex. parallel parking), there is a difference in turning radius between front and rear wheels. If such a difference can no longer be compensated by tire slippage, the vehicle behaves as if it is under braking.
  • The vehicle is tuned so that the tight corner braking phenomenon appears at a certain level with the drive mode in the LOCK position.
 
 
COMMENTS ON TROUBLE SYMPTOM
If the tight corner braking phenomenon occurs only with the drive mode selector being on the AWD ECO, AWD AUTO position, the data received by AWD-ECU from each ECU, the electronic control coupling, or AWD-ECU may have a problem.
 
 
PROBABLE CAUSES
  • Malfunction of electronic control coupling
  • Malfunction of data transmitted from ABS or ASC system
  • Malfunction of data transmitted from the engine control system
  • Wheel speed sensor malfunction
  • Steering wheel sensor malfunction
  • AWD-ECU malfunction
  • Drive mode selector malfunction
 
 
DIAGNOSIS
STEP 1. Check for the tight corner braking phenomenon occurrence during driving on a flat road
Check if the tight corner braking phenomenon occurs during driving on a flat road with the drive mode selector being on the AWD ECO or AWD LOCK position.
Does the tight corner braking phenomenon occur?
Go to Step 2.
This diagnosis is complete.
 
STEP 2. Wiring harness check
(1) Check the wiring harness between the C-228 AWD-ECU connector (terminals No.1and 9) and the D-23 electronic control coupling solenoid connector (terminals No.2 and 1) for damage or other problem.
(2) Check the connector(s) or terminal(s) or wiring harness above for damage or other problem.
Is the check result normal?
Go to Step 3.
Repair the connector(s) or terminal(s) or wiring harness.
 
STEP 3. Scan tool MB991958 data list
Check the data list for the items below (Refer to ).
  • Item No.26: APP sensor
  • Item No.16: FL wheel speed sensor
  • Item No.17: FR wheel speed sensor
  • Item No.18: RL wheel speed sensor
  • Item No.19: RR wheel speed sensor
Is the check result normal?
Go to Step 5.
Perform the troubleshooting of the ASC system (Refer to GROUP 35C - Troubleshooting/Diagnostic Trouble Code Chart ) or the engine control system (Refer to GROUP 13A - Troubleshooting/DTC Chart <2.0L Engine> or GROUP 13C - Troubleshooting/DTC Chart <2.4L Engine>). Then go to Step 4.
 
STEP 4. Check for the tight corner braking phenomenon occurrence during driving on a flat road
Check if the tight corner braking phenomenon occurs during driving on a flat road with the drive mode selector being on the AWD ECO.
Does the tight corner braking phenomenon occur?
(Coil current in the electronic control coupling solenoid is 0 A) : Measure the coil current when the tight corner braking occurs. If the coil current measures 0 A, replace the electronic control coupling. Then go to Step 5.
(Coil current in the electronic control coupling solenoid is other than 0 A) : Measure the coil current when the tight corner braking occurs. If the coil current is other than 0 A, go to Step 5.
This diagnosis is complete. Then go to Step 6.
 
STEP 5. Retest the system.
Does the malfunction occur again?
Replace AWD-ECU (Refer to ). Then go to Step 6 .
The trouble can be an intermittent malfunction (Refer to GROUP 00 - How to Use Troubleshooting/How to Cope with Intermittent Malfunctions ).
 
STEP 6. Retest the system.
Does the malfunction occur again?
Replace the electronic control coupling (Refer to ). Then go to Step 7.
This diagnosis is complete.
 
STEP 7. Retest the system.
Does the malfunction occur again?
Diagnose again from Step 1.
This diagnosis is complete.