DESCRIPTION
The skid control ECU (brake actuator assembly) receives signals from the yaw rate and acceleration sensor (airbag sensor assembly) via CAN communication.
HINT:
If there is a malfunction in the bus lines between the yaw rate and acceleration sensor (airbag sensor assembly) and the CAN communication system, DTC U0123 (Lost Communication with Yaw Rate Sensor Module) is output. When U0123 is output together with C1234, C1472 and/or C1474, inspect and repair the trouble areas indicated by U0123 first.
These DTCs may be stored if one of the following occurs:
DTC No. |
Detection Item |
DTC Detection Condition |
Trouble Area |
---|---|---|---|
C1234 |
Yaw Rate Sensor |
Any of the following is detected:
|
|
C1472 |
Acceleration Sensor |
Any of the following is detected:
|
|
C1474 |
Forward and Rearward G Sensor |
Any of the following is detected:
|
|
Vehicle Condition |
||||
---|---|---|---|---|
Pattern 1 |
Pattern 2 |
Pattern 3 |
||
Diagnosis Condition |
- |
- |
- |
- |
Malfunction Status |
The yaw rate sensor offset value is estimated as less than -5.25 deg/s or more than 5.25 deg/s based on offset correction performed when the vehicle is stopped and then the vehicle starts off. |
○ |
- |
- |
The offset correction did not complete with the vehicle stopped, and the yaw rate sensor offset value is estimated as less than -15 deg/s or more than 15 deg/s based on the offset correction performed while the vehicle is being driven. |
- |
○ |
- |
|
The offset correction completed with the vehicle stopped and the yaw rate sensor offset value is less than -7.5 deg/s or more than 7.5 deg/s. |
- |
- |
○ |
|
Detection Time |
- |
- |
- |
|
Number of Trips |
1 trip |
1 trip |
1 trip |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
DTC Detection Conditions: C1234
Vehicle Condition |
||||
---|---|---|---|---|
Pattern 4 |
Pattern 5 |
Pattern 6 |
||
Diagnosis Condition |
- |
- |
- |
- |
Malfunction Status |
The yaw rate sensor offset value is estimated as less than -7.5 deg/s or more than 7.5 deg/s based on the offset correction performed while the vehicle is being driven. |
○ |
- |
- |
After the VSC system has started, but before the vehicle starts off, the yaw rate sensor value is less than -30 deg/s or more than 30 deg/s for 5 seconds or more when the vehicle is stopped. |
- |
○ |
- |
|
After the VSC system has started, but before the vehicle starts off, the yaw rate sensor value is less than -30 deg/s or more than 30 deg/s for 0.5 seconds or more when the vehicle starts off. |
- |
- |
○ |
|
Detection Time |
- |
- |
- |
|
Number of Trips |
1 trip |
1 trip |
1 trip |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
DTC Detection Conditions: C1234
Vehicle Condition |
||||
---|---|---|---|---|
Pattern 7 |
Pattern 8 |
Pattern 9 |
||
Diagnosis Condition |
- |
- |
- |
- |
Malfunction Status |
The yaw rate sensor value is less than -94.75 deg/s or more than 94.75 deg/s. |
○ |
- |
- |
The change of the yaw rate sensor value within 0.04 seconds is abnormal. |
- |
○ |
- |
|
The value from the yaw rate sensor is judged as abnormal based on the skid control ECU (brake actuator assembly) estimation. |
- |
- |
○ |
|
Detection Time |
0.8 seconds or more |
- |
- |
|
Number of Trips |
1 trip |
1 trip |
1 trip |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
DTC Detection Conditions: C1472
Vehicle Condition |
||||
---|---|---|---|---|
Pattern 1 |
Pattern 2 |
Pattern 3 |
||
Diagnosis Condition |
- |
- |
- |
- |
Malfunction Status |
With the vehicle stopped, the internal acceleration value is less than -7 m/s2 or more than 7 m/s2. |
○ |
- |
- |
The acceleration sensor offset value is estimated as less than -2.25 m/s2 or more than 2.25 m/s2 based on the offset correction performed while the vehicle is being driven. |
- |
○ |
- |
|
The acceleration sensor value is less than -14.6 m/s2 or more than 14.6 m/s2. |
- |
- |
○ |
|
Detection Time |
0.4 seconds or more |
- |
0.8 seconds or more |
|
Number of Trips |
1 trip |
1 trip |
1 trip |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
DTC Detection Conditions: C1474
Vehicle Condition |
|||
---|---|---|---|
Pattern 1 |
Pattern 2 |
||
Diagnosis Condition |
- |
- |
- |
Malfunction Status |
The acceleration sensor offset value is estimated as less than -2.25 m/s2 or more than 2.25 m/s2 based on the offset correction performed while the vehicle is being driven. |
○ |
- |
The acceleration sensor value is less than -14.6 m/s2 or more than 14.6 m/s2. |
- |
○ |
|
Detection Time |
- |
3 seconds or more |
|
Number of Trips |
1 trip |
1 trip |
HINT:
DTC will be output when conditions for either of the patterns in the table above are met.
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
HINT:
When U0073, U0123 and/or U0126 is output together with C1234, C1472 and/or C1474, inspect and repair the trouble areas indicated by U0073, U0123 and/or U0126 first.
Click here
PROCEDURE
1. |
CHECK DTC |
(a) Clear the DTCs.
Click here
Chassis > ABS/VSC/TRAC/EPB > Clear DTCs(b) Turn the ignition switch off.
(c) Start the engine.
(d) At a speed of 30 km/h (18 mph) or more, drive the vehicle, turn the steering wheel, and decelerate (depress the brake pedal) the vehicle.
(e) Turn the ignition switch off.
(f) Turn the ignition switch to ON again and check that no CAN communication system DTCs are output.
Click here
Result |
Proceed to |
---|---|
CAN communication system DTCs are not output. |
A |
CAN communication system DTCs are output. |
B |
B |
INSPECT CAN COMMUNICATION SYSTEM |
|
2. |
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.
Click here
OK:
The airbag sensor assembly is tightened to the specified torque.
The airbag sensor assembly is not tilted.
NG |
INSTALL AIRBAG SENSOR ASSEMBLY CORRECTLY |
|
3. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) |
(a) Make sure that there is no looseness at the locking part and the connecting part of the connector. |
|
(b) Disconnect the yaw rate and acceleration sensor (airbag sensor assembly) connector.
(c) Turn the ignition switch to ON.
(d) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F70-21 (IG2) - Body ground |
Ignition switch ON |
11 to 14 V |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
|
4. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) |
(a) Turn the ignition switch off. |
|
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Tester Connection |
Condition |
Specified Condition |
---|---|---|
F70-25 (E1) - Body ground |
Always |
Below 1 Ω |
F70-26 (E2) - Body ground |
Always |
Below 1 Ω |
HINT:
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing parts.
Click here
OK |
REPLACE AIRBAG SENSOR ASSEMBLY |
NG |
REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT) |
Toyota CH-R Service Manual > Tire Pressure Warning System: Tire Pressure Monitor Receiver Communication Stop (B1247)
DESCRIPTION
The main body ECU (multiplex network body ECU) and tire pressure warning ECU
and receiver are connected using 2 direct lines that they use to communicate with
each other.
DTC No.
Detection Item
DTC Detection Condition
Trouble Area
...
Toyota CH-R Service Manual > Front Brake: Removal
REMOVAL
CAUTION / NOTICE / HINT
NOTICE:
Immediately after installing the brake pads, the braking performance
may be reduced. Always perform a road test in a safe place while paying
attention to the surroundings.
After replacing the front disc brake pads, always perform a road ...