Up to 08/2009

MF1A TRANSFER / 4WD / AWD: ACTIVE TORQUE CONTROL 4WD SYSTEM: C1299: Cancellation of 4WD Control
C1299 - Cancellation of 4WD Control

DESCRIPTION

- If wheel slip continues, differential control will be disabled when the torque-distribution ratio of the differential clutch exceeds the set value and a malfunction in the output of the wheel speed sensors, etc. occurs.

- If a difference in diameter between the front and rear wheels is determined, differential control will be disabled.





INSPECTION PROCEDURE

HINT
Check the condition of each related circuit connector before troubleshooting Electronic Circuit Inspection Procedure.

PROCEDURE

1. CHECK TIRE CONDITION

(a) Check the size and condition of all 4 tires Component Tests and General Diagnostics.

HINT
This DTC is output when tire deformation or a difference in tire size is detected.

OK:

The diameter and air pressure of all 4 tires are the same.

NG -- REPLACE TIRE SO THAT ALL 4 TIRES ARE THE SAME IN SIZE
OK -- Continue to next step.

2. CHECK DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the engine switch on (IG).

(c) Turn the Techstream on.

(d) Check if the Brake control system DTC is output Reading and Clearing Diagnostic Trouble Codes.

(e) Read the DTCs using the Techstream.

Result:





B -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (BRAKE CONTROL SYSTEM) Vehicle Stability Control System
A -- Continue to next step.

3. RECONFIRM DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Start the engine.

(c) Drive the vehicle at the speed of 20 km/h (12 mph) or more and check that the same DTC is output.

Result:





B -- END
A -- Continue to next step.

4. REPLACE 4WD ECU ASSEMBLY

NEXT -- Continue to next step.

5. RECONFIRM DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Start the engine.

(c) Drive the vehicle at the speed of 20 km/h (12 mph) or more and check that the same DTC is output.

Result:





B -- END

A -- REPLACE ELECTRO MAGNETIC CONTROL COUPLING SUB-ASSEMBLY