Steering Angle Sensor Output (C1434)
DESCRIPTION
Steering angle
sensor signals are input to the skid control ECU (brake booster with
master cylinder assembly) via the CAN communication system.
HINT:
When
a malfunction occurs in the communication line to the steering angle
sensor, U0126 (Lost Communication With Steering Angle Sensor Module) is
output.
If a DTC related to the CAN communication line is output, first troubleshoot the CAN communication line.
DTCs may be stored if one of the following occurs:
- Steering angle sensor zero point malfunction.
- Steering angle sensor signal malfunction.
- Steering angle sensor installation abnormality.
|
DTC No. | Detection Item |
INF Code | DTC Detection Condition |
Trouble Area | MIL |
Note |
| C1434 |
Steering Angle Sensor Output |
701 | When communication is normal, a steering angle sensor malfunction is detected. |
- Steering angle sensor installed improperly
- Wire harness or connector
- Steering angle sensor
| Does not come on |
VSC DTC |
WIRING DIAGRAM
CAUTION / NOTICE / HINT
NOTICE:
Inspect the fuses for circuits related to this system before performing the following procedure.
PROCEDURE
(a) Clear the DTCs.
Click here
Chassis > ABS/VSC/TRAC > Clear DTCs
(b) Turn the power switch off.
(c) Turn the power switch on (IG) again and check that no CAN communication system DTCs are output.
Click here
(d) Turn the power switch on (READY).
(e)
Drive the vehicle at a speed of 35 km/h (22 mph), turn the steering
wheel to the right and left, and check that no speed sensor and/or yaw
rate and acceleration sensor DTCs are output.
Click here
Chassis > ABS/VSC/TRAC > Trouble Codes
|
Result | Proceed to |
|
DTC C1434 is output. |
A |
| CAN communication system DTCs are output. |
B |
| Speed sensor and/or yaw rate and acceleration sensor DTCs are output. |
C |
HINT:
- If there is a malfunction in a speed sensor or the yaw rate and
acceleration sensor (airbag ECU assembly), an abnormal value may be
output even though the steering angle sensor is normal.
- If speed sensor and yaw rate and acceleration sensor DTCs are output
simultaneously, repair these malfunctions and inspect the steering angle
sensor.
| B |
 | INSPECT CAN COMMUNICATION SYSTEM |
| C |
| REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
|
A |
 | |
| 2. |
CHECK STEERING ANGLE SENSOR INSTALLATION |
(a) Turn the power switch off.
(b) Check that the steering angle sensor has been installed properly.
Click here
OK:
The steering angle sensor installation is normal.
| NG |
| INSTALL STEERING ANGLE SENSOR CORRECTLY |
|
OK | |
| |
| 3. |
CHECK HARNESS AND CONNECTOR (POWER SOURCE TERMINAL) |
| (a) Remove the steering wheel and column cover. |
 |
|
*a | Front view of wire harness connector
(to Steering Angle Sensor) | | |
(b) Make sure that there is no looseness at the locking part and the connecting part of the connector.
OK:
The connector is securely connected.
(c) Disconnect the G48 steering angle sensor connector.
(d) Check both the connector case and the terminals for deformation and corrosion.
OK:
No deformation or corrosion.
(e) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
|
Tester Connection | Condition |
Specified Condition |
|
G48-4 (BAT) - Body ground |
Always | 11 to 14 V |
|
G48-9 (IG) - Body ground |
Power switch on (IG) |
11 to 14 V |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) |
|
OK | |
| |
| 4. |
CHECK HARNESS AND CONNECTOR (GND TERMINAL) |
| (a) Turn the power switch off. |
 |
|
*a | Front view of wire harness connector
(to Steering Angle Sensor) | | |
(b) Measure the resistance according to the value(s) in the table below.
NOTICE:
Before
measuring the resistance of the steering angle sensor, turn the power
switch off and leave the vehicle for 1 minute or more without operating
the key or switches, or opening or closing the doors.
Standard Resistance:
|
Tester Connection | Condition |
Specified Condition |
|
G48-6 (ESS) - Body ground |
1 minute after power switch off |
Below 1 Ω |
| OK |
| REPLACE STEERING ANGLE SENSOR |
| NG |
| REPAIR OR REPLACE HARNESS OR CONNECTOR (GND CIRCUIT) |
Malfunction in Yaw Rate Sensor (C1436)
DESCRIPTION
The airbag ECU
assembly has a built-in yaw rate and acceleration sensor and detects the
vehicle condition using 2 circuits (GL1, GL2).
When
the skid control ECU (brake booster with master cylinder assembly)
detects improper installation of the yaw rate and acceleration sensor
(airbag ECU assembly) or an abnormality in the difference between the
yaw rate sensor value and the control value estimated based on the
acceleration sensor, steering angle sensor and speed sensor signals, DTC
C1436 is stored.
|
DTC No. | Detection Item |
INF Code | DTC Detection Condition |
Trouble Area | MIL |
Note |
| C1436 |
Malfunction in Yaw Rate Sensor |
713 714 | Either of the following is detected:
- With the vehicle stationary, the yaw rate sensor output value is not 0 deg/s.
- Abnormal comparison value.
|
- Yaw rate sensor (airbag ECU assembly) installed improperly
- Yaw rate sensor (airbag ECU assembly)
| Does not come on |
VSC DTC |
DTC Detection Conditions: C1436 INF Code: 713 or 714 | |
Vehicle Condition |
|
Pattern 1 | Pattern 2 |
|
Diagnosis Condition | The vehicle is stopped. |
â—‹ | - |
|
Malfunction Status | The yaw rate and acceleration sensor output value is not 0 deg/s. |
â—‹ | - |
|
Abnormal comparison value. |
- | â—‹ |
|
Detection Time | - |
- |
|
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.
CAUTION / NOTICE / HINT
NOTICE:
After
replacing or reinstalling the yaw rate and acceleration sensor (airbag
ECU assembly), perform yaw rate and acceleration sensor zero point
calibration after clearing previously calibrated data.
Click here
PROCEDURE
| 1. |
READ VALUE USING TECHSTREAM (YAW RATE SENSOR) |
(a) Select the Data List on the Techstream.
Click here
Chassis > ABS/VSC/TRAC > Data List
|
Tester Display | Measurement Item |
Range | Normal Condition |
Diagnostic Note |
|
Yaw Rate Sensor | Yaw rate sensor 1 |
Min.: -128 degrees/s, Max.: 127 degrees/s |
Vehicle stationary: 0 degrees/s Turning right: -128 to 0 degrees/s
Turning left: 0 to 127 degrees/s |
- |
| Yaw Rate Sensor2 |
Yaw rate sensor 2 | Min.: -128 degrees/s, Max.: 127 degrees/s |
Vehicle stationary: 0 degrees/s Turning right: -128 to 0 degrees/s
Turning left: 0 to 127 degrees/s |
- |
Chassis > ABS/VSC/TRAC > Data List
|
Tester Display |
| Yaw Rate Sensor |
|
Yaw Rate Sensor2 |
(b) Check the yaw rate sensor output value displayed on the Techstream.
|
Result | Proceed to |
|
NG
(The yaw rate sensor (airbag ECU 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 ECU assembly) output value is not 0 deg/s when the vehicle is stationary.) |
B |
| OK |
C |
| B |
 | REPLACE AIRBAG ECU ASSEMBLY |
| C |
| USE SIMULATION METHOD TO CHECK |
|
A |
 | |
| 2. |
CHECK AIRBAG ECU ASSEMBLY INSTALLATION |
(a) Turn the power switch off.
(b) Check that the yaw rate and acceleration sensor (airbag ECU assembly) has been installed properly.
Click here
OK:
The yaw rate and acceleration sensor (airbag ECU assembly) is tightened to the specified torque.
The yaw rate and acceleration sensor (airbag ECU assembly) is not tilted.
| OK |
| REPLACE AIRBAG ECU ASSEMBLY |
| NG |
| INSTALL AIRBAG ECU ASSEMBLY CORRECTLY |
