- Front speed sensor RH/LH
- Sensor installation
- Speed sensor rotor
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VIWH |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 11/2017] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1271,C1272,C1275,C1276; Low Output Signal of Front Speed Sensor RH (Test Mode DTC); 2016 - 2017 MY Sienna [12/2015 - 11/2017] | ||
|
DTC |
C1271 |
Low Output Signal of Front Speed Sensor RH (Test Mode DTC) |
|
DTC |
C1272 |
Low Output Signal of Front Speed Sensor LH (Test Mode DTC) |
|
DTC |
C1275 |
Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC) |
|
DTC |
C1276 |
Abnormal Change in Output Signal of Front Speed Sensor LH (Test Mode DTC) |
DESCRIPTION
DTCs C1271 to C1276 will be cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs from C1271 to C1276 are output only in Test Mode.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1271 C1272 |
Detected only during Test Mode. |
|
|
C1275 C1276 |
Detected only during Test Mode. |
Speed sensor rotor |
HINT:
- DTCs C1271 and C1275 are for the front speed sensor RH.
- DTCs C1272 and C1276 are for the front speed sensor LH.
WIRING DIAGRAM
Refer to DTCs C1401 and C1402 (See page
![2016 - 2017 MY Sienna [12/2015 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1401,C1402; Front Speed Sensor RH Malfunction+](/t3Portal/stylegraphics/info.gif)
).
CAUTION / NOTICE / HINT
NOTICE:
When replacing the brake actuator assembly, perform zero point calibration and store system information (See page
).
PROCEDURE
|
1. |
CHECK HARNESS AND CONNECTOR (MOMENTARY INTERRUPTION) |
(a) Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to the DTC (See page
).
ABS/VSC/TRAC
|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
FR Speed Open |
FR speed sensor open detection / Error or Normal |
Error: Momentary interruption Normal: Normal |
- |
|
FL Speed Open |
FL speed sensor open detection / Error or Normal |
Error: Momentary interruption Normal: Normal |
- |
Result
|
Result |
Proceed to |
|---|---|
|
There are momentary interruptions |
A |
|
There are no momentary interruptions |
B |
|
There is a constant open circuit |
C |
HINT:
Perform the above inspection before removing the sensor and connector.
| B |
|
| C |
|
|
|
2. |
REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR) |
(a) Turn the ignition switch off.
(b) Repair or replace the harness or connector.
(c) Check for any momentary interruption between the skid control ECU and the front speed sensor (See page
).
(d) Check that there are no momentary interruptions.
|
|
3. |
PERFORM TEST MODE (SIGNAL CHECK) |
(a) Turn the ignition switch off.
(b) Perform the sensor check in the Test Mode procedure (See page
).
OK:
All Test Mode DTCs are cleared.
| OK |
|
END |
|
|
4. |
READ VALUE USING TECHSTREAM (FRONT SPEED SENSOR) |
(a) Turn the ignition switch off.
(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.
| NG |
|
|
|
5. |
PERFORM TEST MODE (SIGNAL CHECK) |
(a) Turn the ignition switch off.
(b) Perform the sensor check in the Test Mode procedure (See page
).
OK:
All Test Mode DTCs are cleared.
| OK |
|
CHECK FOR INTERMITTENT PROBLEMS (See page
|
|
|
6. |
CHECK FRONT SPEED SENSOR INSTALLATION |
|
(a) Turn the ignition switch off. |
|
(b) 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
|
*a |
OK |
|
*b |
NG |
|
*c |
Clearance |
|
*d |
8.0 N*m (82 kgf*cm, 71 in.*lbf) |
| NG |
|
|
|
7. |
CHECK FRONT SPEED SENSOR TIP |
(a) Remove the front speed sensor (See page
).
(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 |
|
|
8. |
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 |
|
|
9. |
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - FRONT SPEED SENSOR) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector.
(b) Disconnect the skid control ECU connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A4-7 (FR+) - A20-2 (FR+) |
Always |
Below 1 Ω |
|
A4-7 (FR+) - Body ground |
Always |
10 kΩ or higher |
|
A4-6 (FR-) - A20-1 (FR-) |
Always |
Below 1 Ω |
|
A4-6 (FR-) - Body ground |
Always |
10 kΩ or higher |
for LH
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A4-19 (FL+) - A6-2 (FL+) |
Always |
Below 1 Ω |
|
A4-19 (FL+) - Body ground |
Always |
10 kΩ or higher |
|
A4-18 (FL-) - A6-1 (FL-) |
Always |
Below 1 Ω |
|
A4-18 (FL-) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
10. |
INSPECT SKID CONTROL ECU (SENSOR INPUT) |
|
(a) Reconnect the skid control ECU connector. |
|
(b) Turn the ignition switch to ON.
(c) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
for RH
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
A20-2 (FR+) - Body ground |
Ignition switch ON |
8 to 14 V |
for LH
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
A6-2 (FL+) - Body ground |
Ignition switch ON |
8 to 14 V |
Text in Illustration
|
*a |
Front view of wire harness connector (to Front Speed Sensor) |
| NG |
|
|
|
11. |
PERFORM TEST MODE (SIGNAL CHECK) |
(a) Turn the ignition switch off.
(b) Perform the sensor check in the Test Mode procedure (See page
).
OK:
All Test Mode DTCs are cleared.
| OK |
|
CHECK FOR INTERMITTENT PROBLEMS (See page
|
|
|
12. |
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
).
|
|
13. |
PERFORM TEST MODE (SIGNAL CHECK) |
(a) Perform the sensor check in the Test Mode procedure (See page
).
OK:
All Test Mode DTCs are cleared.
| OK |
|
END |
|
|
14. |
REPLACE FRONT SPEED SENSOR ROTOR |
(a) Turn the ignition switch off.
(b) Remove the front drive shaft assembly (See page
).
(c) Replace the front drive outboard joint shaft assembly (front speed sensor rotor) (See page
).
HINT:
If the front speed sensor rotor needs to be replaced, replace it together with the front drive outboard joint shaft assembly.
NOTICE:
Check the speed sensor signal after replacement (See page
).
|
|
15. |
PERFORM TEST MODE (SIGNAL CHECK) |
(a) Perform the sensor check in the Test Mode procedure (See page
).
OK:
All Test Mode DTCs are cleared.
| OK |
|
END |
| NG |
|
|
|