2006 Lexus IS 250 AWDFACTORY OEM SERVICE PROCEDURE

Problem Symptoms Table

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 PROBLEM SYMPTOMS TABLE  and proceed to the relevant troubleshooting reference.

FOUR WHEEL DRIVE CONTROL SYSTEM 

PROBLEM SYMPTOMS TABLE

Symptom Suspected area Reference
Phenomenon of tight-corner braking(1)
  1. Steering angle sensor circuit
  2. Transfer control solenoid circuit
  3. 4WD control ECU
  4. Transfer assembly
  1. DTC C1297/97 Steering Angle Sensor 
  2. DTC C1298/98 Linear Solenoid Circuit 
  3. REMOVAL 
  4. REMOVAL 
4WD warning remains on (Multi-information display)
  1. CAN communication system
  2. Multiplex communication system
  3. 4WD control system
  4. 4WD control system power source circuit
  5. Brake control system
  6. Combination meter system
  7. 4WD control ECU
  8. Combination meter
  1. SYSTEM DESCRIPTION
  2. SYSTEM DESCRIPTION
  3. HOW TO PROCEED WITH TROUBLESHOOTING 
  4. DATA LIST / ACTIVE TEST 
  5. HOW TO PROCEED WITH TROUBLESHOOTING
  6. HOW TO PROCEED WITH TROUBLESHOOTING
  7. REMOVAL 
  8. REMOVAL
4WD warning does not come on (Multi-information display)
  1. CAN communication system
  2. Multiplex communication system
  3. Combination meter
  4. 4WD control ECU
  1. SYSTEM DESCRIPTION
  2. SYSTEM DESCRIPTION
  3. REMOVAL
  4. 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
  2. 4WD control ECU
  1. TC and CG Terminal Circuit 
  2. 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
  2. 4WD control ECU
  1. TC and CG Terminal Circuit 
  2. REMOVAL 
HINT:
(1) 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.
Chapter Navigation
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