C1440

BRAKE CONTROL: VEHICLE STABILITY CONTROL SYSTEM: C1440: Steering Angle Sensor Unusual Bank Angle Detected
C1440 - Steering Angle Sensor Unusual Bank Angle Detected

DESCRIPTION

The skid control ECU receives signals from the yaw rate and deceleration sensor via the CAN communication system.

The yaw rate sensor has a built in deceleration sensor and detects the vehicle condition.

If there is trouble in the bus lines between the yaw rate and deceleration sensor and the CAN communication system, the DTCs U0123 (malfunction in CAN communication with the yaw rate sensor) and U0124 (malfunction in CAN communication with the deceleration sensor) are output.





WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
* Before proceeding with the inspection, explain to the customer that the vehicle driving record shows that the vehicle was driven on a bank at an angle of 30°, and confirm that this condition occurred.
* When replacing the yaw rate sensor assembly, perform zero point calibration Component Tests and General Diagnostics.

HINT
When U0123, U0124 and/or U0126 is output together with C1440, inspect and repair the trouble areas indicated by U0123, U0124 and/or U0126 first U Code Charts.

PROCEDURE

1. CHECK DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the ignition switch off.

(c) At a speed of 30 km/h (19 mph) or more, drive the vehicle, turn the steering wheel, and decelerate (depress the brake pedal) the vehicle.

(d) Turn the ignition switch to ON again and check that no CAN communication system DTC is output Reading and Clearing Diagnostic Trouble Codes.

Result:





HINT
DTC C1440 may have been stored because the vehicle was driven on a bank at an angle of 30° or more.

D -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) How To Proceed With Troubleshooting

C -- REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Vehicle Stability Control System

B -- GO TO CAN COMMUNICATION SYSTEM CAN Communication System
A -- Continue to next step.

2. CHECK YAW RATE AND DECELERATION SENSOR INSTALLATION

(a) Turn the ignition switch off.

(b) Check that the yaw rate and deceleration sensor has been installed properly Installation.

OK:

The sensor should be tightened to the specified torque.

The sensor should not be tilted.

NG -- INSTALL YAW RATE AND DECELERATION SENSOR CORRECTLY Installation
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM (MOMENTARY INTERRUPTION)

(a) Using the Techstream, check for any momentary interruption in the wire harness and connector corresponding to the DTC Check For Intermittent Problems.

ABS/VSC/TRAC





OK:

There are no momentary interruptions

HINT
Perform the above inspection before removing the sensor and connector.

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - YAW RATE AND DECELERATION SENSOR)

OK -- CHECK FOR INTERMITTENT PROBLEMS (SYMPTOM SIMULATION) How To Proceed With Troubleshooting

4. REPAIR OR REPLACE HARNESS OR CONNECTOR (SKID CONTROL ECU - YAW RATE AND DECELERATION SENSOR)

(a) Turn the ignition switch off.

(b) Repair or replace the harness or connector.

(c) Check for any momentary interruption between the skid control ECU and yaw rate and deceleration sensor Check For Intermittent Problems.

NEXT -- Continue to next step.

5. RECONFIRM DTC

(a) Clear the DTC Reading and Clearing Diagnostic Trouble Codes.

(b) Turn the ignition switch off.

(c) At a speed of 30 km/h (19 mph) or more, drive the vehicle, turn the steering wheel, and decelerate (depress the brake pedal) the vehicle.

(d) Check if the same DTC is output Reading and Clearing Diagnostic Trouble Codes.

B -- END

A -- REPLACE YAW RATE SENSOR ASSEMBLY Removal