Problem Symptoms Table

WARNING: This page is about a different car, the 2007 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.

HINT:

If a normal system code is displayed during the DTC check but the problem still occurs, check the circuits for each problem symptom in the order given in the table below .

FOUR WHEEL DRIVE CONTROL SYSTEM

Symptom	Suspected area	See
Phenomenon of tight-corner braking*	1. Steering angle sensor circuit	DTC C1297/97 STEERING ANGLE SENSOR
	2. Transfer control solenoid circuit	DTC C1298/98 LINEAR SOLENOID CIRCUIT
	3. 4WD control ECU	REMOVAL
	4. Transfer assembly	REMOVAL
4WD warning remains on (Multi-information display)	1. CAN communication system	CAN COMMUNICATION
	2. Multiplex communication system	MULTIPLEX COMMUNICATION
	3. 4WD control system	HOW TO PROCEED WITH TROUBLESHOOTING
	4. 4WD control system power source circuit	DTC C1241/94 LOW POWER SUPPLY VOLTAGE
	5. Brake control system	HOW TO PROCEED WITH TROUBLESHOOTING
	6. Combination meter system	HOW TO PROCEED WITH TROUBLESHOOTING
	7. 4WD control ECU	REMOVAL
	8. Combination meter	REMOVAL
4WD warning does not come on (Multi-information display)	1. CAN communication system	CAN COMMUNICATION
	2. Multiplex communication system	MULTIPLEX COMMUNICATION
	3. Combination meter	REMOVAL
	4. 4WD control ECU	REMOVAL
The system is in the DTC output mode although terminals TC and CG of the DLC3 are not shorted	1. TC and CG terminal circuit	TC AND CG TERMINAL CIRCUIT
	2. 4WD control ECU	REMOVAL
The system is not in the DTC output mode although terminals TC and CG of the DLC3 are shorted	1. TC and CG terminal circuit	TC AND CG TERMINAL CIRCUIT
	2. 4WD control ECU	REMOVAL
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.