No.3 FRONT WHEELS SLIP FREQUENTLY

id030300800900

Possible Cause

• The traction performance of the tire is too low for engine power and road surface friction coefficients (4WD system is normal)

• The following cause is suspected if the front wheels slip frequently in 4WD lock mode (the wheels slip as frequently as in 4WD AUTO mode).

― 4WD lock solenoid is inoperative.

• The wheel alignment is not adjusted correctly (4WD system is normal)

• Excessive tire wear (4WD system is normal)

• RBC unit malfunction

Diagnostic Procedure

Warning

• When performing the driving test, vehicle stability may be lost suddenly. Perform the driving test in safe surroundings to avoid any unexpected accident.

STEP

INSPECTION

ACTION

1

INSPECT FOR OTHER MALFUNCTIONS

•  Is there any other malfunction listed in the symptom troubleshooting chart?

Yes

Go to the applicable diagnostic procedure.

No

Go to the next step.

2

VERIFY THE MALFUNCTION

•  Compare the frequency of front wheel slip between 4WD lock mode and 4WD AUTO mode.

•  Is there any difference in the slip frequency?

Yes

Go to the next step.

No

Perform the diagnostic procedure “No.2 MODE CHANGE BETWEEN AUTO AND 4WD ON IS NOT PERFORMED NORMALLY”.

3

VERIFY TIRE PRESSURE

•  Verify the tire pressure.

•  Is tire pressure within the specification?

Yes

Go to the next step.

No

Adjust the tire pressure and go to the next step.

4

COMPARE WITH OTHER VEHICLE’S TIRES

•  Install the tires of the compared vehicle to the malfunctioning vehicle.

•  Perform the driving test.

•  Is there any malfunction?

Yes

Go to the next step.

No

The 4WD system is normal. (The tires are the suspected cause)

5

COMPARE WITH OTHER VEHICLE

•  Install the tires of the malfunctioning vehicle to the compared vehicle.

•  Perform the driving test.

•  Is there any malfunction?

Yes

The 4WD system is normal. (The tires are the suspected cause)

No

Go to the next step.

6

VERIFY WHEEL ALIGNMENT

•  Verify the wheel alignment.

•  Is the wheel alignment within the specification?

Yes

Replace the RBC unit.

No

Adjust the wheel alignment.

STEP	INSPECTION		ACTION
1	INSPECT FOR OTHER MALFUNCTIONS • Is there any other malfunction listed in the symptom troubleshooting chart?	Yes	Go to the applicable diagnostic procedure.
1		No	Go to the next step.
2	VERIFY THE MALFUNCTION • Compare the frequency of front wheel slip between 4WD lock mode and 4WD AUTO mode. • Is there any difference in the slip frequency?	Yes	Go to the next step.
2		No	Perform the diagnostic procedure “No.2 MODE CHANGE BETWEEN AUTO AND 4WD ON IS NOT PERFORMED NORMALLY”.
3	VERIFY TIRE PRESSURE • Verify the tire pressure. • Is tire pressure within the specification?	Yes	Go to the next step.
3		No	Adjust the tire pressure and go to the next step.
4	COMPARE WITH OTHER VEHICLE’S TIRES • Install the tires of the compared vehicle to the malfunctioning vehicle. • Perform the driving test. • Is there any malfunction?	Yes	Go to the next step.
4		No	The 4WD system is normal. (The tires are the suspected cause)
5	COMPARE WITH OTHER VEHICLE • Install the tires of the malfunctioning vehicle to the compared vehicle. • Perform the driving test. • Is there any malfunction?	Yes	The 4WD system is normal. (The tires are the suspected cause)
5		No	Go to the next step.
6	VERIFY WHEEL ALIGNMENT • Verify the wheel alignment. • Is the wheel alignment within the specification?	Yes	Replace the RBC unit.
6		No	Adjust the wheel alignment.