ABS AND TCS OPERATE FREQUENTLY/INSUFFICIENT TCS OPERATION [ELECTRONICALLY CONTROLLED BRAKE SYSTEM]

id040309070700

Outline

Description	ABS and TCS*1 operate frequently Insufficient TCS*1 operation *1: The DSC system also includes the TCS function, and the TCS/DSC operation indicator light flashes during TCS operation.
Possible cause	•  The tire size or tire pressure of each tire differs •  ABS wheel-speed sensor outputs error signal •  EV system malfunction (TCS malfunctioning)
System wiring diagram	Not applicable
Connector diagram	Not applicable

Diagnostic Procedure

Step	Inspection	Results	Action
1	INSPECT RELATED MODULE FOR MALFUNCTION •  Verify the PCM and 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].) (See DTC TABLE [PCM (e-SKYACTIV)].)
		No	Go to the next step.
2	VERIFY TIRE CONDITION •  Verify the tire pressure and specifications of the tire. (See WHEEL AND TIRE SPECIFICATION [(E)].) •  Are the tire pressure and specifications of the tire normal?	Yes	Go to the next step.
		No	Adjust the tire pressure or replace with a specified tire and perform the repair completion verification.
*3	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.