Toyota Tacoma (2015-2018) Service Manual: Yaw Rate Sensor Malfunction (C1436)
DESCRIPTION
The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via the CAN communication system.
The airbag sensor assembly has a built-in yaw rate sensor and detects the vehicle condition.
If there is trouble in the bus lines between the acceleration sensor (airbag sensor assembly) and the CAN communication system, DTC U0124 (Lost Communication with Lateral Acceleration Sensor Module) is set.
These DTCs are also output when calibration has not been completed.
|
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
|---|---|---|---|
|
C1436 |
Yaw Rate Sensor Malfunction |
Either of the following is detected:
|
|
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
CAUTION / NOTICE / HINT
NOTICE:
When replacing the yaw rate and acceleration sensor (airbag sensor assembly),
perform zero point calibration and store system information (See page
.gif)
).
HINT:
When U0124 and/or U0126 is output together with C1436, inspect and repair the
trouble areas indicated by U0124 and/or U0126 first (See page
).
PROCEDURE
|
1. |
READ VALUE USING TECHSTREAM (YAW RATE SENSOR) |
(a) Connect the Techstream to the DLC3.
(b) Turn the ignition switch to ON.
(c) Turn the Techstream on.
(d) Enter the following menus: Chassis / ABS/VSC/TRAC / Data List.
(e) According to the display on the Techstream, read the Data List.
(f) Check that the yaw rate sensor output value displayed on the Techstream.
ABS/VSC/TRAC|
Tester Display |
Measurement Item |
Range |
Normal Condition |
Diagnostic Note |
|---|---|---|---|---|
|
Yaw Rate Sensor |
Yaw rate sensor |
Min.: -128°/s Max.: 127°/s |
Vehicle stopped: 0°/s Turning right: -128 to 0°/s Turning left: 0 to 127°/s |
- |
HINT:
If troubleshooting has been carried out according to the Problem Symptoms Table,
refer back to the table and proceed to the next step (See page
).
|
Result |
Proceed to |
|---|---|
|
NG (The yaw rate sensor (airbag sensor assembly) output value is 0 deg/s when the vehicle is stationary, but the value fluctuates when turning) |
A |
|
NG (The yaw rate sensor (airbag sensor assembly) output value is not 0 deg/s when the vehicle is stationary) |
B |
|
OK |
C |
| B | .gif) |
REPLACE AIRBAG SENSOR ASSEMBLY |
| C | |
USE SIMULATION METHOD TO CHECK |
|
.gif)
|
2. |
CHECK AIRBAG SENSOR ASSEMBLY INSTALLATION |
(a) Turn the ignition switch off.
(b) Check that the airbag sensor assembly has been installed properly (See page
).
OK:
The sensor should be tightened to the specified torque.
The sensor should not be installed in a tilted position.
| OK | |
REPLACE AIRBAG SENSOR ASSEMBLY |
| NG | |
INSTALL AIRBAG SENSOR ASSEMBLY |
Steering Angle Sensor Output Malfunction (C1434)
DESCRIPTION
Steering angle sensor signals are input to the skid control ECU (brake actuator
assembly) via the CAN communication system.
HINT:
When a malfunction occurs in the communication line t ...
Lost Communication with ECM (C1437)
DESCRIPTION
The skid control ECU (brake actuator assembly) receives signals from the ECM
via the CAN communication system.
DTC No.
Detection Item
DTC Detection Con ...
Other materials:
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use these procedures to troubleshoot the lane departure alert system.
*: Use the Techstream.
PROCEDURE
1.
VEHICLE BROUGHT TO WORKSHOP
NEXT
...
Dtc Check / Clear
DTC CHECK / CLEAR
NOTICE:
When the diagnosis system is changed from normal mode to check mode or vice versa,
all DTCs and freeze frame data recorded in normal mode are cleared. Before changing
modes, always check and make a note of DTCs and freeze frame data.
HINT:
DTCs which are sto ...
CD cannot be Ejected
PROCEDURE
1.
CHECK OPERATION
(a) Press the disc eject switch of the radio and display receiver assembly for
5 seconds or more and check that the CD is ejected.
OK:
CD is ejected.
NG
REPLACE RADIO AND DISPLAY RECEIVER ASSEMBLY
...
