Last Modified: 04-05-2023 6.11:8.1.0 Doc ID: RM100000000VIQC
Model Year Start: 2016 Model: Sienna Prod Date Range: [12/2015 -           ]
Title: MF1A (TRANSFER / 4WD / AWD): ACTIVE TORQUE CONTROL 4WD SYSTEM: C1299; Cancellation of 4WD Control; 2016 - 2020 MY Sienna [12/2015 -        ]

DTC

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.

DTC No.

DTC Detection Condition

Trouble Area

C1299

  • When one of the following conditions is met:

    - Condition that controls coupling calorific value is predefined value or more.

    - The estimated transfer oil temperature exceeds the specified value.

    - Vehicle is driven and energy load tire radius difference between front tires and rear tires is more than 3%.

  • Tire size
  • Electromagnetic control coupling
  • 4WD control ECU

CAUTION / NOTICE / HINT

HINT:

Check the condition of each related circuit connector before troubleshooting (See page 2016 - 2020 MY Sienna [12/2015 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: ELECTRONIC CIRCUIT INSPECTION PROCEDURE ).

PROCEDURE

1.

CHECK TIRE CONDITION

(a) Check the size and condition of all 4 tires (See page 2016 MY Sienna [12/2015 - 08/2016]; TIRE / WHEEL: TIRE AND WHEEL SYSTEM: INSPECTION 2017 - 2020 MY Sienna [08/2016 -        ]; TIRE / WHEEL: TIRE AND WHEEL SYSTEM: INSPECTION ).

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

2.

CHECK FOR DTC

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Check if the Brake control system DTC is output (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DTC CHECK / CLEAR ).

(e) Read the DTCs using the Techstream.

Result

Result

Proceed to

Only "C1299" is output

A

"C1299" and other DTCs (Brake control system DTC)

B

B

REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (BRAKE CONTROL SYSTEM)

(See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DIAGNOSTIC TROUBLE CODE CHART 2018 - 2020 MY Sienna [11/2017 -        ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: DIAGNOSTIC TROUBLE CODE CHART )

A

3.

RECONFIRM DTC

(a) Clear the DTC (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; MF1A (TRANSFER / 4WD / AWD): ACTIVE TORQUE CONTROL 4WD SYSTEM: DTC CHECK / CLEAR 2018 - 2020 MY Sienna [11/2017 -        ]; MF1A (TRANSFER / 4WD / AWD): ACTIVE TORQUE CONTROL 4WD SYSTEM: DTC CHECK / CLEAR ).

(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

Result

Proceed to

DTC is output (C1299)

A

DTC is not output

B

B

END

A

4.

REPLACE 4WD CONTROL ECU

(a) Replace 4WD control ECU (See page 2016 - 2020 MY Sienna [12/2015 -        ]; MF1A (TRANSFER / 4WD / AWD): 4WD CONTROL ECU: REMOVAL ).

NEXT

5.

RECONFIRM DTC

(a) Clear the DTC (See page 2016 - 2017 MY Sienna [12/2015 - 11/2017]; MF1A (TRANSFER / 4WD / AWD): ACTIVE TORQUE CONTROL 4WD SYSTEM: DTC CHECK / CLEAR 2018 - 2020 MY Sienna [11/2017 -        ]; MF1A (TRANSFER / 4WD / AWD): ACTIVE TORQUE CONTROL 4WD SYSTEM: DTC CHECK / CLEAR ).

(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

Result

Proceed to

DTC is output (C1299)

A

DTC is not output

B

A

REPLACE ELECTRO MAGNETIC CONTROL COUPLING SUB-ASSEMBLY

B

END