- Rear speed sensor RH/LH
- Sensor installation
- Speed sensor rotor
| Last Modified: 04-05-2023 | 6.11:8.1.0 | Doc ID: RM100000000VIWI |
| Model Year Start: 2016 | Model: Sienna | Prod Date Range: [12/2015 - 11/2017] |
| Title: BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1273,C1274,C1277,C1278; Low Output Signal of Rear Speed Sensor RH (Test Mode DTC); 2016 - 2017 MY Sienna [12/2015 - 11/2017] | ||
|
DTC |
C1273 |
Low Output Signal of Rear Speed Sensor RH (Test Mode DTC) |
|
DTC |
C1274 |
Low Output Signal of Rear Speed Sensor LH (Test Mode DTC) |
|
DTC |
C1277 |
Abnormal Change in Output Signal of Rear Speed Sensor RH (Test Mode DTC) |
|
DTC |
C1278 |
Abnormal Change in Output Signal of Rear Speed Sensor LH (Test Mode DTC) |
DESCRIPTION
DTCs C1273 to C1278 will be cleared when the speed sensor sends a vehicle speed signal or when Test Mode ends. DTCs from C1273 to C1278 are output only in Test Mode.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1273 C1274 |
Detected only during Test Mode. |
|
|
C1277 C1278 |
Detected only during Test Mode. |
Speed sensor rotor |
HINT:
- DTCs C1273 and C1277 are for the rear speed sensor RH.
- DTCs C1274 and C1278 are for the rear speed sensor LH.
WIRING DIAGRAM
Refer to DTCs C1403 and C1404 (See page
![2016 - 2017 MY Sienna [12/2015 - 11/2017]; BRAKE CONTROL / DYNAMIC CONTROL SYSTEMS: VEHICLE STABILITY CONTROL SYSTEM: C1403,C1404; Rear 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 |
|---|---|---|---|
|
RR Speed Open |
RR speed sensor open detection / Error or Normal |
Error: Momentary interruption Normal: Normal |
- |
|
RL Speed Open |
RL 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 - REAR 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 rear 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 (REAR 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 |
|---|---|---|---|
|
RR Wheel Speed |
Rear 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 |
|
RL Wheel Speed |
Rear 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 REAR SPEED SENSOR INSTALLATION |
|
(a) Turn the ignition switch off. |
|
(b) Check the speed sensor installation (for 2WD).
OK:
There is no clearance between the sensor and the rear axle carrier.
(c) Check the speed sensor installation (for AWD).
OK:
There is no clearance between the sensor and the rear axle carrier.
The installation bolt is tightened properly.
Torque
8.0 N*m (82 kgf*cm, 71 in.*lbf)
Text in Illustration
|
*A |
for 2WD |
|
*B |
for AWD |
|
*a |
OK |
|
*b |
NG |
|
*c |
Clearance |
|
*d |
8.0 N*m (82 kgf*cm, 71 in.*lbf) |
Result
|
Result |
Proceed to |
|---|---|
|
OK (for AWD) |
A |
|
OK (for 2WD) |
B |
|
NG (for 2WD) |
C |
|
NG (for AWD) |
D |
| B |
|
| C |
|
| D |
|
|
|
7. |
CHECK REAR SPEED SENSOR TIP |
(a) Remove the rear 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 REAR SPEED SENSOR |
|
|
8. |
CHECK REAR SPEED SENSOR ROTOR |
(a) Remove the rear speed sensor rotor (See page
).
(b) Check the speed sensor rotor.
OK:
No scratches, oil, or foreign matter on the rotor.
Result
|
Result |
Proceed to |
|---|---|
|
NG |
A |
|
OK |
B |
NOTICE:
Check the speed sensor signal after cleaning or replacement (See page
).
HINT:
If the rear speed sensor rotor needs to be replaced, replace it together with the drive outboard joint shaft.
| A |
|
CLEAN OR REPLACE REAR SPEED SENSOR ROTOR |
|
|
9. |
CHECK HARNESS AND CONNECTOR (SKID CONTROL ECU - REAR SPEED SENSOR) |
(a) for 2WD
(1) Make sure that there is no looseness at the locking part and the connecting part of the connector.
(2) Disconnect the skid control ECU connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A4-17 (RR+) - k1-2 (RR+) |
Always |
Below 1 Ω |
|
A4-17 (RR+) - Body ground |
Always |
10 kΩ or higher |
|
A4-16 (RR-) - k1-1 (RR-) |
Always |
Below 1 Ω |
|
A4-16 (RR-) - Body ground |
Always |
10 kΩ or higher |
for LH
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A4-5 (RL+) - n1-2 (RL+) |
Always |
Below 1 Ω |
|
A4-5 (RL+) - Body ground |
Always |
10 kΩ or higher |
|
A4-4 (RL-) - n1-1 (RL-) |
Always |
Below 1 Ω |
|
A4-4 (RL-) - Body ground |
Always |
10 kΩ or higher |
(b) for AWD
(1) Make sure that there is no looseness at the locking part and the connecting part of the connector.
(2) Disconnect the skid control ECU connector.
(3) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
for RH
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A4-17 (RR+) - L41-1 (RR+) |
Always |
Below 1 Ω |
|
A4-17 (RR+) - Body ground |
Always |
10 kΩ or higher |
|
A4-16 (RR-) - L41-2 (RR-) |
Always |
Below 1 Ω |
|
A4-16 (RR-) - Body ground |
Always |
10 kΩ or higher |
for LH
|
Tester Connection |
Condition |
Specified Condition |
|---|---|---|
|
A4-5 (RL+) - K30-1 (RL+) |
Always |
Below 1 Ω |
|
A4-5 (RL+) - Body ground |
Always |
10 kΩ or higher |
|
A4-4 (RL-) - K30-2 (RL-) |
Always |
Below 1 Ω |
|
A4-4 (RL-) - Body ground |
Always |
10 kΩ or higher |
| NG |
|
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
|
10. |
INSPECT SKID CONTROL ECU (SENSOR INPUT) |
(a) for 2WD
|
(1) Reconnect the skid control ECU connector. |
|
(2) Turn the ignition switch to ON.
(3) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
for RH
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
k1-2 (RR+) - Body ground |
Ignition switch ON |
8 to 14 V |
for LH
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
n1-2 (RL+) - Body ground |
Ignition switch ON |
8 to 14 V |
Text in Illustration
|
*a |
Front view of wire harness connector (to Rear Speed Sensor) |
(b) for AWD
|
(1) Reconnect the skid control ECU connector. |
|
(2) Turn the ignition switch to ON.
(3) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
for RH
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
L41-1 (RR+) - Body ground |
Ignition switch ON |
8 to 14 V |
for LH
|
Tester Connection |
Switch Condition |
Specified Condition |
|---|---|---|
|
K30-1 (RL+) - Body ground |
Ignition switch ON |
8 to 14 V |
Text in Illustration
|
*a |
Front view of wire harness connector (to Rear 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.
Result
|
Result |
Proceed to |
|---|---|
|
OK |
A |
|
NG (for 2WD) |
B |
|
NG (for AWD) |
C |
| A |
|
CHECK FOR INTERMITTENT PROBLEMS (See page
|
| C |
|
|
|
12. |
REPLACE REAR AXLE HUB AND BEARING ASSEMBLY |
(a) Turn the ignition switch off.
(b) Replace the rear speed sensor and the rear axle hub and bearing assembly (rear speed sensor rotor) (See page
).
HINT:
The rear speed sensor rotor is incorporated into the rear axle hub and bearing assembly.
If the rear speed sensor rotor needs to be replaced, replace it together with the rear axle hub and bearing assembly with rear speed sensor.
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 |
| NG |
|
|
14. |
REPLACE REAR SPEED SENSOR |
(a) Turn the ignition switch off.
(b) Replace the rear speed sensor (See page
).
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 |
|
|
16. |
REPLACE REAR SPEED SENSOR ROTOR |
(a) Turn the ignition switch off.
(b) Remove the rear drive shaft assembly (See page
).
(c) Replace the rear drive outboard joint shaft assembly (rear speed sensor rotor) (See page
).
HINT:
If the rear speed sensor rotor needs to be replaced, replace it together with the rear drive outboard joint shaft assembly.
NOTICE:
Check the speed sensor signal after replacement (See page
).
|
|
17. |
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 |
|
|
|