NO.4 ABS OR TCS OPERATES FREQUENTLY/TCS DOES NOT WORK CORRECTLY [DSC/RSC]

id0403b3815700

4

ABS or TCS ^* operates frequently./TCS^* does not work correctly.

^*: DSC/RSC system function contains traction control function; DSC indicator light goes on and off while DSC/RSC is operating.

Possible cause

•  There is a difference in size or air pressure between the front and rear tires

•  Incorrect ABS wheel-speed signal is input to DSC/RSC HU/CM

•  There is a malfunction in the engine control system (TCS malfunction)

•  Tire problem (low or high air pressure, excessive wear, different grip level by four wheels)

Diagnostic procedure

STEP	INSPECTION		ACTION
1	INSPECT DTCS IN DSC/RSC HU/CM • Inspect the DTC for the ON-BOARD DIAGNOSTIC SYSTEM. • Have DTCs been stored in memory?	Yes	Perform the applicable DTC inspection. (See ON-BOARD DIAGNOSIS [DSC/RSC].)
1		No	Go to the next step.
2	INSPECT TIRE SIZE AND AIR PRESSURE • Inspect the tire size and the air pressure. • Are size and air pressure as specified?	Yes	Go to the next step.
2		No	Replace with specified tires and adjust tire air pressure.
3	INSPECT ABS WHEEL-SPEED SENSOR OUTPUT VALUE • Inspect the output value from the ABS wheel-speed sensor. (See FRONT ABS WHEEL-SPEED SENSOR INSPECTION.) (See REAR ABS WHEEL-SPEED SENSOR INSPECTION [2WD].) (See REAR ABS WHEEL-SPEED SENSOR INSPECTION [4WD].) • Is the output value normal?	Yes	Go to the next step.
3		No	• ABS wheel-speed sensor installation inspection: Inspect the sensor for looseness and verify that it is securely installed. • Sensor rotor installation inspection: Inspect the sensor rotor for poor installation and chipping of sensor rotor teeth. (If sensor rotor is installed poorly, it may cause output of abnormal wave form at high speed.)
4	VERIFY THAT TIRE CONDITION • Verify tire condition for following: ― Wear ― Grip level (different by four wheels) • Are tires condition okay?	Yes	Find malfunctioning part according to “INTERMITTENT CONCERN TROUBLESHOOTING”.
4		No	Adjust, repair or replace tire.

4	ABS or TCS ^* operates frequently./TCS^* does not work correctly. ^*: DSC/RSC system function contains traction control function; DSC indicator light goes on and off while DSC/RSC is operating.
Possible cause	• There is a difference in size or air pressure between the front and rear tires • Incorrect ABS wheel-speed signal is input to DSC/RSC HU/CM • There is a malfunction in the engine control system (TCS malfunction) • Tire problem (low or high air pressure, excessive wear, different grip level by four wheels)