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Home >> Lexus >> 2015 >> IS 250 F Sport, AWD >> Repair and Diagnosis >> Transmission >> Transfer Case >> Four Wheel Drive Control System - Diagnostics - Introduction >> Four Wheel Drive Control System >> Problem Symptoms Table [04/2013 - 09/2020] >> Problem Symptoms Table [04/2013 - 09/2020]
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Problem Symptoms Table [04/2013 - 09/2020]

HINT: 

Symptom Suspected Area Link
Tight-corner braking phenomenon* Steering sensor circuit Refer to DTC C1297/97: Steering Angle Sensor [04/2013 - 09/2020]
Skid control ECU (Brake actuator assembly) Refer to TERMINALS OF ECU [04/2013 - 08/2015] , or refer to TERMINALS OF ECU [08/2015 - 10/2016] , or refer to TERMINALS OF ECU [10/2016 - 10/2017] , or refer to TERMINALS OF ECU [10/2017 - 09/2020]
Transfer control solenoid circuit Refer to DTC C1298/98: Linear Solenoid Circuit [04/2013 - 09/2020]
4WD ECU assembly Refer to TERMINALS OF ECU [04/2013 - 10/2016] , or refer to TERMINALS OF ECU [10/2016 - ] 
Automatic transmission with transfer assembly Refer to COMPONENTS [04/2013 - 09/2020]
AWD warning message remains displayed AWD warning remains on Refer to AWD Warning Remains ON [04/2013 - 08/2015] , or refer to AWD Warning Remains ON [08/2015 - 09/2020]
AWD warning message is not displayed AWD warning does not come on Refer to AWD Warning does not Come ON [04/2013 - 09/2020]
The system is in DTC output mode although terminals TC and CG of the DLC3 are not connected TC and CG terminal circuit Refer to TC and CG Terminal Circuit [04/2013 - 08/2015] , or refer to TC and CG Terminal Circuit [08/2015 - 09/2018] , or refer to TC and CG Terminal Circuit [09/2018 - 09/2020]
The system is not in DTC output mode although terminals TC and CG of the DLC3 are connected TC and CG terminal circuit Refer to TC and CG Terminal Circuit [04/2013 - 08/2015] , or refer to TC and CG Terminal Circuit [08/2015 - 09/2018] , or refer to TC and CG Terminal Circuit [09/2018 - 09/2020]
AWD warning does not come on Refer to AWD Warning does not Come ON [04/2013 - 09/2020]

HINT: 

*: Phenomenon of tight-corner braking

When driving in 4-wheel drive mode, the vehicle is hard to turn, as if the brakes were applied, due to the rotational difference between the front and rear tires while turning.