Inspection Procedure 4

INSPECTION PROCEDURE 4: The tight corner braking phenomenon (difficult to turn) appears frequently with the S-AWC control mode selector in the NORMAL or SNOW mode

CAUTION:

- If there is any problem in the CAN bus lines, an incorrect trouble symptom may occur. Prior to this diagnosis, always diagnose the CAN bus lines.

- Whenever the ECU is replaced, ensure that the CAN bus lines are normal.

SYMPTOMS

The electronic control coupling (Front), electronic control coupling (center) or AWC-ECU may have a problem.

PROBABLE CAUSES

- Malfunction of electronic control coupling (Front)

- Malfunction of electronic control coupling (center)

- Damaged harness wires and connectors

- Malfunction of AWC-ECU

DIAGNOSTIC PROCEDURE

STEP 1. M.U.T.-III CAN bus diagnostics.

Use scan tool to perform the CAN bus diagnosis.

Q. Is the check result normal?

YES Go to Step 3.
NO Repair the CAN bus lines. CAN Bus Diagnostics Chart). After repairing the CAN bus line, go to Step 2.
STEP 2. Retest the system.

Q. Is the check result normal?

YES Intermittent malfunction. How to Cope With Intermittent Malfunctions).
NO Go to Step 3.
STEP 3. M.U.T.-III data list

Item 1: S-AWC control mode (Refer to Data List Reference Table).

Q. Is the check result normal?

YES Go to Step 4.
NO Check/repair the S-AWC control mode selector. (Refer to Inspection Procedure 3.) Then go to Step 9.
STEP 4. Check of the electronic control coupling (Front)

Refer to Electronic Control Coupling (Front) Operation Check [Vehicles with S-AWC].

Q. Is the check result normal?

YES Go to Step 5.
NO Replace the transfer assembly (Refer to Transfer Assembly Removal and Installation [Vehicles with S-AWC]). Then go to Step 9.
STEP 5. Check of the electronic control coupling (center)

Electronic Control Coupling Inspection [Electronic Control 4WD].

Q. Is the check result normal?

YES Go to Step 6.
NO Replace the electronic control coupling (center). Service and Repair). Then go to Step 9.
STEP 6. M.U.T.-III data list

Item No.13: Engine torque (Driver request) (Refer to Data List Reference Table).

Q. Is the check result normal?

YES Go to Step 7.
NO Perform the troubleshooting for the engine. Multiport Fuel Injection (MFI)). Then go to Step 9.
STEP 7. M.U.T.-III data list

Check the following data list. (Refer to Data List Reference Table).

- Item No.8: Steering angle sensor

- Item No.21: Wheel speed sensor [FL]

- Item No.22: Wheel speed sensor [FR]

- Item No.23: Wheel speed sensor [RL]

- Item No.24: Wheel speed sensor [RR]

- Item No.25: Yaw rate sensor

- Item No.26: Lateral G sensor

Q. Is the check result normal?

YES Go to Step 8.
NO Perform the troubleshooting for the ASC. Active Stability Control System (ASC)). Then go to Step 9.
STEP 8. Retest the system.

Q. Is the check result normal?

YES Intermittent malfunction. How to Cope With Intermittent Malfunctions).
NO Replace the AWC-ECU. (Refer to AWC-ECU Removal and Installation). Then go to Step 9.
STEP 9. Retest the system.

Q. Is the check result normal?

YES This diagnosis is complete.
NO Return to Step 1.