C1299

UF1AE TRANSFER: FOUR WHEEL DRIVE CONTROL SYSTEM: C1299/99: Cancellation of 4WD Control
C1299/99 - 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 TIRES SO THAT ALL 4 TIRES ARE THE SAME IN SIZE
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM

(a) Connect the Techstream to the DLC3.

(b) Start the engine.

(c) Select the "Data List" on the Techstream .

(d) Check that the speed values detected at all four wheels displayed on the Techstream are the same when driving the vehicle.

DATA LIST: (Absorber Control ECU)





OK:

The vehicle speed detected at all four wheels must be indicated on the Techstream.

NG -- CHECK SPEED SIGNAL CIRCUIT
OK -- Continue to next step.

3. RECONFIRM DTC

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

(b) Turn the engine switch off.

(c) Start the engine.

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

Result:





B -- END

A -- REPLACE 4WD CONTROL ECU