Toyota Tacoma (2015-2018) Service Manual: Yaw Rate Sensor Malfunction (C1436)
DESCRIPTION
The skid control ECU (master cylinder solenoid) receives signals from the yaw rate and acceleration (airbag sensor assembly) via the CAN communication system.
The airbag sensor assembly has a built-in yaw rate and acceleration sensor and detects the vehicle's condition using 2 circuits (GL1, GL2).
If there is trouble in the bus lines between the yaw rate and acceleration sensor (airbag sensor assembly) and the CAN communication system, DTCs U0123 (yaw rate sensor communication trouble) and U0124 (acceleration sensor communication trouble) are stored.
These DTCs are also output when calibration has not been completed.
|
DTC Code |
DTC Detection Condition |
Trouble Area |
|---|---|---|
|
C1436 |
Either condition is met:
|
|
WIRING DIAGRAM
Refer to DTCs C1232, C1243 and C1245 (See page
.gif)
).
CAUTION / NOTICE / HINT
NOTICE:
- When replacing the yaw rate and acceleration sensor (airbag sensor assembly),
perform calibration (See page
).
- Check the yaw rate and acceleration sensor (airbag sensor assembly)
signal after replacement (See page
).
PROCEDURE
|
1. |
CHECK CAN COMMUNICATION SYSTEM |
(a) Check for DTCs (See page
).
|
Result |
Proceed to |
|---|---|
|
CAN DTC is not output |
A |
|
CAN DTC is output |
B |
| B | .gif) |
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
|
.gif)
|
2. |
READ VALUE USING TECHSTREAM (YAW RATE SENSOR) |
(a) Turn the ignition switch off.
(b) Connect the Techstream to the DLC3.
(c) Turn the ignition switch to ON.
(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 |
|---|---|---|---|
|
Yaw Rate Sensor |
Yaw rate and acceleration sensor 1 reading/ Min.: -128°/s, Max.: 127°/s |
0°/s: Vehicle stationary -128 to 0°/s: Right turn 0 to 127°/s: Left turn |
- |
(f) Check that the yaw rate and acceleration sensor output value is displayed on the Techstream.
Result|
Result |
Proceed to |
|
|---|---|---|
|
NG |
Yaw rate and acceleration sensor output value is 0°/s when vehicle is stationary, but value fluctuates when turning |
A |
|
Yaw rate and acceleration sensor output value is not 0°/s when vehicle is stationary |
B |
|
|
OK |
C |
|
| B | |
REPLACE AIRBAG SENSOR ASSEMBLY |
| C | |
USE SIMULATION METHOD TO CHECK |
|
|
3. |
CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION |
(a) Turn the ignition switch off.
(b) Check that the yaw rate and acceleration sensor (airbag sensor assembly)
is installed properly (See page
).
OK:
The sensor is tightened to the specified torque.
The sensor is not installed at an angle.
| OK | |
REPLACE AIRBAG SENSOR ASSEMBLY |
| NG | |
INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY |
Steering Angle Sensor Output Malfunction (C1434)
DESCRIPTION
Steering angle sensor (spiral cable with sensor sub-assembly) signals are sent
to the skid control ECU (master cylinder solenoid) via the CAN communication system.
When there is a mal ...
Lost Communication with ECM (C1437)
DESCRIPTION
The skid control ECU (master cylinder solenoid) receives signals from the ECM
via the CAN communication system.
DTC Code
DTC Detection Condition
Troubl ...
Other materials:
Installation
INSTALLATION
PROCEDURE
1. INSPECT PROPELLER SHAFT WITH CENTER BEARING ASSEMBLY (with Grease Fitting)
Text in Illustration
*1
Grease Fitting
-
-
*a
View A
*b
Front Side
HINT:
When replacing t ...
Diagnosis System
DIAGNOSIS SYSTEM
DIAGNOSIS FUNCTION
(a) The diagnosis function turns off the cruise control indicator, illuminates
the master warning light and displays a warning message when a malfunction is detected.
When a malfunction is detected in the dynamic radar cruise control system, DTCs
are store ...
Installation
INSTALLATION
CAUTION / NOTICE / HINT
HINT:
Use the same procedure for the RH side and LH side.
The following procedure is for the LH side.
When installing a new front fender wheel opening moulding or quarter
panel wheel opening moulding, heat the vehicle body and front fender ...
