DESCRIPTION
The skid control ECU (master cylinder solenoid) acquires steering angle sensor (spiral cable with sensor sub-assembly) zero point every time the ignition switch is turned to ON and the vehicle is driven at 35 km/h (22 mph) or more for approximately 5 seconds. The ECU also stores the previous zero point.
The steering angle sensor (spiral cable with sensor sub-assembly) zero point malfunction warning will be cancelled by turning the ignition switch to off.
DTC Code |
DTC Detection Condition |
Trouble Area |
---|---|---|
C1439 |
After the steering angle sensor 0 calibration is cleared due to, for example, fluctuations in the power source, the steering angle 0 calibration cannot be obtained for 0.048 seconds of continuous driving |
|
C1445 |
Steering angle sensor 0 calibration cannot be obtained when the vehicle is driven without a record of steering angle sensor 0 calibration at a speed of 36 km/h (22 mph) or more for 30 seconds or more without the brake pedal being depressed |
|
CAUTION / NOTICE / HINT
NOTICE:
HINT:
PROCEDURE
1. |
CHECK DTC |
(a) Clear the DTCs (See page ).
(b) Turn the ignition switch off.
(c) Turn the ignition switch to ON again and check that no CAN communication system DTC is output (See page ).
(d) Drive the vehicle at a speed of 35 km/h (22 mph) and turn the steering wheel to the right and left, and then check that no speed sensor and yaw rate and acceleration sensor (airbag sensor assembly) DTCs are output (See page ).
Result
Result |
Proceed to |
|
---|---|---|
DTC is output |
C1439 and/or C1445 |
A |
Relating to CAN communication system |
B |
|
Relating to speed sensor or yaw rate and acceleration sensor |
C |
|
DTC is not output |
D |
HINT:
B |
GO TO COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) |
C |
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
D |
USE SIMULATION METHOD TO CHECK |
|
2. |
PERFORM STEERING ANGLE SENSOR ZERO POINT CALIBRATION |
(a) Drive the vehicle straight ahead at 35 km/h (22 mph) or more for at least 5 seconds.
(b) Check that the centered position of the steering wheel is correctly set while driving straight ahead.
HINT:
If the front wheel alignment and steering position are adjusted as a result of an abnormal centered position of the steering wheel, acquire the yaw rate and acceleration sensor zero point again after the adjustments are completed.
OK:
The centered position of the steering wheel is correctly set.
NG |
ADJUST FRONT WHEEL ALIGNMENT OR STEERING POSITION |
|
3. |
RECONFIRM DTC |
(a) Clear the DTCs (See page ).
(b) Turn the ignition switch off.
(c) Start the engine.
(d) Drive the vehicle at a speed of 35 km/h (22 mph) or more and turn the steering wheel to the right and left.
(e) Check if the same DTC is output (See page ).
Result
Result |
Proceed to |
---|---|
DTCs C1439 and C1445 are not output |
A |
Yaw rate and acceleration sensor and/or steering angle sensor DTC is output |
B |
HINT:
If DTC C1439 and/or C1445 is not output again, the DTC may have been stored due to a temporary loss of the steering angle zero calibration, such as when the power voltage drops.
A |
END |
B |
REPAIR CIRCUITS INDICATED BY OUTPUT DTCS |
How To Proceed With Troubleshooting
CAUTION / NOTICE / HINT
HINT:
Use the following procedure to troubleshoot the audio and visual system.
*: Use the Techstream.
PROCEDURE
1.
VEHICLE BROUGHT TO WORKSHOP
NEXT
...
Driver Side Power Window Auto Up / Down Function does not Operate with Power
Window Master Switch
DESCRIPTION
If the manual up/down function can be performed but the auto up/down function
cannot, then the fail-safe mode may be functioning.
If the power window initialization (See page
) has not been performed, the auto up/down function will not operate.
WIRING DIAGRAM
CAUTION / NOTICE ...
Power Supply Drive Circuit (C1257)
DESCRIPTION
The motor relay (semiconductor relay) is built into the hydraulic brake booster
and drives the pump motor based on a signal from the skid control ECU (master cylinder
solenoid).
DTC No.
DTC Detecting Condition
Trouble Areas
C1257
...