- At a vehicle speed 10 km/h (6 mph) or more, output voltage from one of the speed sensors is less than that from the other sensors for 15 seconds or more (for 2WD) or for 30 seconds or more (for AWD).
- At a vehicle speed less than 10 km/h (6 mph), output from one of the speed sensors is 0 km/h (0 mph) for 1 second or more.
- At a vehicle speed 10 km/h (6 mph) or more, outputs from both front speed sensors are 0 km/h (0 mph) for 15 seconds or more (for 2WD) or for 30 seconds or more (for AWD).
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VIVP |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 11/2017] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1401,C1402; Front Speed Sensor RH Malfunction; 2016 - 2017 MY Sienna [12/2015 - 11/2017] | ||
|
DTC |
C1401 |
Front Speed Sensor RH Malfunction |
|
DTC |
C1402 |
Front Speed Sensor LH Malfunction |
DESCRIPTION
The speed sensor detects wheel speed and sends the appropriate signals to the skid control ECU. These signals are used for ABS control.
Speed sensor rotors have 48 serrations and their magnetic fields change when the rotors turn. Each speed sensor detects that magnetic change and sends a pulse signal to the skid control ECU.
The hall IC type speed sensor uses the frequency of output pulses to detect the vehicle speed. Because the sensor outputs digital pulses, it can detect vehicle speeds even when the vehicle is nearly stationary.
HINT:
Measure the connection status between the sensor connector and the vehicle wire harness.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1401 C1402 |
Any of the following is detected: |
|
HINT:
- DTC C1401 is for the front speed sensor RH.
- DTC C1402 is for the front speed sensor LH.
WIRING DIAGRAM
PROCEDURE
|
1. |
CHECK FRONT SPEED SENSOR INSTALLATION |
|
(a) Check the speed sensor installation. OK: There is no clearance between the sensor and the front steering knuckle. The installation bolt is tightened properly. Torque 8.0 N*m (82 kgf*cm, 71 in.*lbf) Text in Illustration
|
|
| NG |
|
|
|
2. |
CHECK FRONT SPEED SENSOR TIP |
(a) Remove the front speed sensor (See page
![2016 - 2020 MY Sienna [12/2015 - ]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: FRONT SPEED SENSOR: REMOVAL](/t3Portal/stylegraphics/info.gif)
).
(b) Check the speed sensor tip.
OK:
No scratches, oil, or foreign matter on the sensor tip.
NOTICE:
Check the speed sensor signal after cleaning or replacement (See page
).
| NG |
|
CLEAN OR REPLACE FRONT SPEED SENSOR |
|
|
3. |
CHECK FRONT SPEED SENSOR ROTOR |
(a) Remove the front speed sensor rotor (See page
).
(b) Check the speed sensor rotor.
OK:
No scratches, oil, or foreign matter on the rotor.
NOTICE:
Check the speed sensor signal after cleaning or replacement (See page
).
HINT:
If the front speed sensor rotor needs to be replaced, replace it together with the front drive outboard joint shaft assembly.
| NG |
|
CLEAN OR REPLACE FRONT SPEED SENSOR ROTOR |
|
|
4. |
READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR) |
(a) Install the front speed sensor and the front speed sensor rotor.
(b) Connect the Techstream to the DLC3.
(c) Start the engine.
(d) Turn the Techstream on.
(e) Enter the following menus: Chassis / ABS/VSC/ TRAC / Data List.
(f) Select the Data List on the Techstream (See page
).
ABS/VSC/TRAC
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
FR Wheel Speed |
Front wheel speed sensor RH reading / Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) |
Vehicle stopped: 0 km/h (0 mph) |
When driving at constant speed: No large fluctuations |
|
FL Wheel Speed |
Front wheel speed sensor LH reading / Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) |
Vehicle stopped: 0 km/h (0 mph) |
When driving at constant speed: No large fluctuations |
(g) Check that the speed value output from the speed sensor displayed on the Techstream.
HINT:
Factors that affect the indicated vehicle speed include tire size, tire inflation, and tire wear. The speed indicated on the speedometer has an allowable margin of error. This can be tested using a speedometer tester (calibrated chassis dynamometer). For details about testing and the margin of error, see the reference chart (See page
).
OK:
The speed value output from the speed sensor displayed on the Techstream is the similar speed as indicated on the speedometer.
| OK |
|
CHECK FOR INTERMITTENT PROBLEMS (See page
|
|
|
5. |
REPLACE FRONT SPEED SENSOR |
(a) Turn the ignition switch off.
(b) Replace the front speed sensor (See page
).
NOTICE:
Check the speed sensor signal after replacement (See page
).
|
|
6. |
RECONFIRM DTC |
(a) Clear the DTCs (See page
).
(b) Start the engine.
(c) Drive the vehicle at a speed of 40 km/h (25 mph) or more for at least 60 seconds.
(d) Check if the same DTC is recorded (See page
).
Result
|
Result |
Proceed to |
|---|---|
|
DTCs (C1401 and C1402) are not output |
A |
|
DTCs (C1401 and/or C1402) are output |
B |
NOTICE:
Check the speed sensor signal after replacement (See page
).
HINT:
- If the front speed sensor rotor needs to be replaced, replace it together with the front drive outboard joint shaft assembly.
-
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step (See page
).
| A |
|
END |
| B |
|
REPLACE FRONT SPEED SENSOR ROTOR (See page
|
|
|