Toyota Tacoma 2015-2018 Service Manual: Low Output Signal of Rear Speed Sensor RH (Test Mode DTC) (C1273,C1274,C1403,C1404)
DESCRIPTION
Refer to DTCs C1401 and C1402 (See page .gif)
).
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1273 C1274 |
Stored only during test mode. |
|
|
C1403 C1404 |
One of the following conditions is met:
|
|
HINT:
- DTCs C1403 and C1273 are for the rear speed sensor RH.
- DTCs C1404 and C1274 are for the rear speed sensor LH.
CAUTION / NOTICE / HINT
NOTICE:
Check the speed sensor signal after cleaning or replacement (See page
).
PROCEDURE
|
1. |
CHECK REAR 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 rear axle. The installation nut is tightened properly. Torque: 8.0 N*m (82 kgf*cm, 71 in.*lbf) Text in Illustration
|
|
| NG | .gif) |
INSTALL REAR SPEED SENSOR CORRECTLY |
|
.gif)
|
2. |
INSPECT 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:
If no damage to the speed sensor tip is found during this inspection, do not replace the speed sensor.
| NG | |
CLEAN OR REPLACE REAR SPEED SENSOR |
|
|
3. |
INSPECT REAR SPEED SENSOR ROTOR |
(a) Remove the rear axle hub and bearing assembly (See page
).
(b) Check the speed sensor rotor.
OK:
No scratches, oil, or foreign matter on the rotors.
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.
| NG | |
CLEAN OR REPLACE REAR AXLE HUB AND BEARING ASSEMBLY |
|
|
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.
ABS/VSC/TRAC|
Tester Display |
Measurement Item/Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|
|
RR Wheel Speed |
Rear speed sensor RH reading/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) |
Actual wheel speed |
No large fluctuations when driving at a constant speed. |
|
RL Wheel Speed |
Rear speed sensor LH reading/ Min.: 0 km/h (0 mph), Max.: 326 km/h (202 mph) |
Actual wheel speed |
No large fluctuations when driving at a constant speed. |
(f) Check that there is no difference between the speed value output from the speed sensor displayed on the Techstream and the speed value displayed on the speedometer when driving the vehicle.
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 same as the actual vehicle speed measured using a speedometer tester (calibrated chassis dynamometer).
| OK | |
USE SIMULATION METHOD TO CHECK |
|
|
5. |
REPLACE REAR SPEED SENSOR |
(a) Replace the rear speed sensor (See page
).
|
|
6. |
RECONFIRM DTC |
(a) Clear the DTCs (See page
).
(b) Turn the ignition switch off.
(c) Start the engine.
(d) Drive the vehicle at a speed of 40 km/h (25 mph) or more or at least 60 seconds.
(e) Check if the same DTC is output (See page
).
|
Result |
Proceed to |
|---|---|
|
DTCs C1403 and C1404 are not output |
A |
|
DTCs C1403 and/or C1404 are output |
B |
| A | |
END |
| B | |
REPLACE REAR AXLE HUB AND BEARING ASSEMBLY |
Low Output Signal of Front Speed Sensor RH (Test Mode DTC) (C1271,C1272,C1401,C1402)
DESCRIPTION
The speed sensor detects the wheel speed and sends the appropriate signals to
the skid control ECU (master cylinder solenoid). These signals are used for brake
control.
The speed sen ...
Abnormal Change in Output Signal of Front Speed Sensor RH (Test Mode DTC) (C1275,...,C1414)
DESCRIPTION
Refer to DTCs C1401 and C1402 (See page ).
DTC Code
DTC Detection Condition
Trouble Area
C1275
C1276
Stored only during t ...
Other materials:
Data List / Active Test
DATA LIST / ACTIVE TEST
NOTICE:
In the table below, the values listed under "Normal Condition" are reference
values. Do not depend solely on these reference values when deciding whether a part
is faulty or not.
HINT:
Using the Techstream to read the Data List allows the values or s ...
System Diagram
SYSTEM DIAGRAM
Communication Table
Sender
Receiver
Signal
Line
*1: for Vacuum Brake Booster
*2: for Hydraulic Brake Booster
Millimeter Wave Radar Sensor Assembly
Forward Recognition Camera
...
Freeze Frame Data
FREEZE FRAME DATA
DESCRIPTION
(a) Whenever a lane departure alert system is stored, the forward recognition
camera stores the current vehicle state (ECU and sensor information) as Freeze Frame
Data.
CHECK FREEZE FRAME DATA
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch ...
