INSPECTION PROCEDURE
3: The Tight Corner Braking Phenomenon* Appears with the S-AWC Drive Mode-selector
in the AWC ECO or NORMAL Position.
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- *Tight corner braking phenomenon: When a 4WD 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 tyre
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 SNOW or LOCK position.
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COMMENTS ON TROUBLE SYMPTOM
If the tight corner braking phenomenon occurs with the S-AWC drive mode-selector being
on the AWC ECO position, the electronic control coupling may have a problem. If the tight corner
braking phenomenon occurs only with the S-AWC drive mode-selector being on the NORMAL position,
the data received by AWC-ECU from each ECU, the electronic control coupling, or AWC-ECU may
have a problem.
PROBABLE CAUSES
- Malfunction of electronic control coupling
- Malfunction of data transmitted from ASC system
- Malfunction of data transmitted from the engine control system
- Malfunction of wheel speed sensor
- Malfunction of steering wheel sensor
- Malfunction of AWC-ECU
- Malfunction of S-AWC drive mode-selector
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STEP 1. Check for the tight corner braking phenomenon occurrence
during driving on a flat road
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Check if the tight corner braking phenomenon occurs during driving on a flat road with
the S-AWC drive mode-selector being on the AWC ECO or NORMAL position.
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Q.
Does the tight corner braking phenomenon occur?
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Go to Step 2.
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This diagnosis is complete.
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STEP 2. Wiring harness check
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(1)Check the wiring harness between the AWC-ECU connector (terminal FSL+,
FSL-) and the electronic control coupling solenoid connector (front) for damage or other problem.
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(2)Check the wiring harness between the AWC-ECU connector (terminal SOL+,
SOL-) and the electronic control coupling solenoid connector (centre) for damage or other problem.
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(3)Check the connector(s) or terminal(s) or wiring harness above for damage or other
problem.
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Q.
Is the check result normal?
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Go to Step 3.
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Repair the connector(s) or terminal(s) or wiring harness.
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STEP 3. M.U.T.-III data list
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Check the data list for the items below (Refer to ).
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- Item No.8: Steering angle sensor
- Item No.11: Accelerator position
- Item No.18: FL wheel speed sensor
- Item No.19: FR wheel speed sensor
- Item No.20: RL wheel speed sensor
- Item No.21: RR wheel speed sensor
- Item No.22: Yaw rate sensor
- Item No.23: Lateral G sensor
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Q.
Is the check result normal?
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Go to Step 5.
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Perform the troubleshooting of the ASC system (Refer to GROUP 35C - Diagnosis,
Diagnostic Trouble Code Chart ) or the engine control system
(Refer to GROUP 13D - Diagnosis, Diagnostic Trouble Code Chart ).
Then go to Step 4.
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STEP 4. Check for the tight corner braking phenomenon occurrence during
driving on a flat road
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Check if the tight corner braking phenomenon occurs during driving on a flat road with
the S-AWC drive mode-selector being on the AWC ECO.
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Q.
Does the tight corner braking phenomenon occur?
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YES (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 transfer assembly (Refer to ) or
electronic control coupling (centre) (Refer to GROUP 27C - Electronic control coupling
(centre)). Then go to Step 5.
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YES (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.
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This diagnosis is complete. Then go to Step 6.
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STEP 5. Retest the system.
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Q.
Does the malfunction occur again?
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Replace the AWC-ECU (Refer to ). Then go to
Step 6 .
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The trouble can be an intermittent malfunction (Refer to GROUP 00 - How
to Use Troubleshooting/How to Cope with Intermittent Malfunctions).
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STEP 6. Retest the system.
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Q.
Does the malfunction occur again?
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Replace the transfer assembly (Refer to )
or electronic control coupling (centre) (Refer to GROUP 27C - Electronic control coupling
(centre)). Then go to Step 7.
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This diagnosis is complete.
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STEP 7. Retest the system.
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Q.
Does the malfunction occur again?
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Diagnose again from Step 1.
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This diagnosis is complete.
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