DSC OPERATES FREQUENTLY/INSUFFICIENT DSC OPERATION [ELECTRONICALLY CONTROLLED BRAKE SYSTEM]

id040309070800

Outline

Description	DSC*2 operates frequently Insufficient DSC*2 operation *2: The TCS/DSC operation indicator light flashes during DSC operation.
Possible cause	•  Electronically controlled brake unit detects malfunction (input/output device malfunction) •  Tire malfunction (4 tires with air pressure, wear condition, or grip level that differ are used) •  Sophisticated Airbag Sensor (SAS) control module installation malfunction (if there is Sophisticated Airbag Sensor (SAS) control module installation malfunction, DSC may operate frequently) •  After replacing electronically controlled brake unit and Sophisticated Airbag Sensor (SAS) control module, sensor initialization procedure for electronically controlled brake unit related parts is not performed (if initialization procedure is not performed, DSC may operate insufficiently) •  ABS wheel-speed sensor outputs error signal
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step	Inspection	Results	Action
1	VERIFY ELECTRONICALLY CONTROLLED BRAKE UNIT DTCs •  Verify the electronically controlled brake unit DTCs. (See DTC INSPECTION.) •  Is a DTC displayed?	Yes	Repair the malfunctioning location according to the applicable DTC troubleshooting. (See DTC TABLE [ELECTRONICALLY CONTROLLED BRAKE UNIT].)
		No	Go to the next step.
2	VERIFY SOPHISTICATED AIRBAG SENSOR (SAS) CONTROL MODULE INSTALLATION CONDITION •  Verify the Sophisticated Airbag Sensor (SAS) control module installation condition. •  Is Sophisticated Airbag Sensor (SAS) control module (yaw rate sensor, low-G sensor) securely installed?	Yes	Go to the next step.
		No	Install the Sophisticated Airbag Sensor (SAS) control module securely, and perform the repair completion verification. (See SAS CONTROL MODULE REMOVAL/INSTALLATION [TWO-STEP DEPLOYMENT CONTROL SYSTEM (E)].)
3	VERIFY SENSOR INITIALIZATION PROCEDURE PERFORMANCE CONDITION FOR ELECTRONICALLY CONTROLLED BRAKE UNIT RELATED PARTS •  After replacing the electronically controlled brake unit and the Sophisticated Airbag Sensor (SAS) control module, has the sensor initialization procedure for the electronically controlled brake unit related parts been performed?	Yes	Go to the next step.
		No	Perform the sensor initialization procedure for the electronically controlled brake unit related parts, and perform the repair completion verification. (See ELECTRONICALLY CONTROLLED BRAKE UNIT RELATED PARTS SENSOR INITIALIZATION PROCEDURE.)
4	VERIFY TIRE CONDITION •  Verify the tire pressure and specifications of the tire. •  Are the tire pressure and specifications of the tire normal? (See WHEEL AND TIRE SPECIFICATION [(E)].)	Yes	Go to the next step.
		No	Adjust the tire pressure or replace with a specified tire and perform the repair completion verification.
*5	INSPECT ABS WHEEL-SPEED SENSOR FOR MALFUNCTION •  Inspect the applicable parts for the following. ―  ABS wheel-speed sensor installation condition ―  ABS sensor rotor installation condition (if installed at an angle, it may cause output of abnormal wave pattern at high speeds) ―  ABS sensor rotor damage (See FRONT ABS WHEEL-SPEED SENSOR INSPECTION.) (See REAR ABS WHEEL-SPEED SENSOR INSPECTION.) •  Is the applicable part normal?	Yes	Refer to [ACTION FOR NON-REPEATABLE MALFUNCTIONS] to find the malfunctioning location. (See TROUBLESHOOTING PROCEDURE [(E)].)
		No	Repair or replace the malfunctioning location and perform the repair completion verification. (See FRONT ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.) (See REAR ABS WHEEL-SPEED SENSOR REMOVAL/INSTALLATION.)
Repair completion verification	VERIFY IF MALFUNCTION CAUSE IS CORRECTED •  Install/connect the part removed/disconnected during the troubleshooting procedure. •  Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. Explain repair contents to customer.
		No	Refer to the CAN (controller area network) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].) If the CAN communication is normal, perform the diagnosis from Step 1.