-
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%.
| 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 |
|
|
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](/t3Portal/stylegraphics/info.gif)
).
PROCEDURE
|
1. |
CHECK TIRE CONDITION |
(a) Check the size and condition of all 4 tires (See page
).
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 |
|
|
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
).
(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
|
|
|
3. |
RECONFIRM DTC |
(a) Clear the DTC (See page
).
(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 |
|
|
4. |
REPLACE 4WD CONTROL ECU |
(a) Replace 4WD control ECU (See page
).
|
|
5. |
RECONFIRM DTC |
(a) Clear the DTC (See page
).
(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 |
|
|