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 |
---|---|---|
C1210 |
Zero point calibration of the yaw rate sensor is incomplete. |
|
C1336 |
Zero point calibration of the acceleration sensor is incomplete. |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
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 | ![]() |
GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
|
2. |
PERFORM ZERO POINT CALIBRATION OF YAW RATE AND ACCELERATION SENSOR |
(a) Perform zero point calibration of the yaw rate and acceleration sensor (See
page
).
|
3. |
PERFORM TEST MODE (SIGNAL CHECK) |
(a) Turn the ignition switch off.
(b) Perform the signal check in the Test Mode Procedure (See page
).
OK:
All test mode DTCs are cleared.
OK | ![]() |
END |
|
4. |
CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION |
(a) Turn the ignition switch off.
(b) Check that the yaw rate and acceleration sensor (airbag sensor assembly)
has been installed properly (See page
).
OK:
The sensor is tightened to the specified torque.
The sensor is not installed at an angle.
NG | ![]() |
INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY |
|
5. |
READ VALUE USING TECHSTREAM (YAW RATE AND ACCELERATION 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 |
---|---|---|---|
Deceleration Sensor |
Acceleration sensor/ Min.: -18.525 m/s2, Max.: 18.387 m/s2 |
- |
Changes continuously during acceleration/deceleration. |
Deceleration Sensor2 |
Acceleration sensor 2/ Min.: -18.525 m/s2, Max.: 18.387 m/s2 |
- |
Changes continuously during acceleration/deceleration. |
Yaw Rate Sensor |
Yaw rate sensor/ 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.
OK:
The yaw rate and acceleration sensor output value is normal.
NOTICE:
The yaw rate and acceleration sensor (airbag sensor assembly) output value is
normal (See page
).
OK | ![]() |
REPLACE MASTER CYLINDER SOLENOID |
NG | ![]() |
REPLACE AIRBAG SENSOR ASSEMBLY |
Open or Short in Master Cylinder Pressure Sensor (C1421,C1423,C1424,C142A,C1449)
DESCRIPTION
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
C1421
Open or Short in Master Cylinder Pressure Sensor
Any of the following is detected:
When voltage at terminal +BS is 9.5 V or ...
Compressor Lock Sensor Circuit (B1422)
SYSTEM DESCRIPTION
The ECM sends the engine speed signal to the air conditioning amplifier assembly
via CAN communication.
The air conditioning amplifier assembly reads the difference between compressor
speed and engine speed. When the difference becomes too large, the air conditioning
ampli ...
Removal
REMOVAL
CAUTION / NOTICE / HINT
NOTICE:
When replacing the windshield glass of a vehicle equipped with a forward recognition
camera, make sure to use a Toyota genuine part. If a non-Toyota genuine part is
used, the forward recognition camera may not be able to be installed due to a missing
...