Inspection Procedure

1. CHECK DTC 
   1. Clear the DTC (See DTC CHECK / CLEAR  ).
   2. Turn the engine switch off.
   3. Turn the engine switch on (IG) and check that no CAN communication system DTC is output.
   4. Start the engine.
   5. Drive the vehicle and turn the steering wheel to the right and left at a speed of 24 mph (35 km/h) and check if brake control system DTC (C1231/31) and/or a CAN communication system DTC are output (See DTC CHECK / CLEAR ).

   Result 

   DTC OUTPUT RESULT
   
   

   Result	Proceed to
   Neither a CAN communication system DTC nor brake control system DTC (C1231/31) is output	A
   CAN communication system DTC is output	B
   Brake control system DTC (C1231/31) is output	C

   HINT:

   When DTCs indicating a CAN communication system malfunction are output, repair the CAN communication system before repairing each corresponding sensor.

   B: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (CAN COMMUNICATION SYSTEM) 

   C: REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (BRAKE CONTROL SYSTEM) 

   A: Go To Next Step 

2. INSPECT STEERING ANGLE SENSOR 
   1. Connect the intelligent tester to the DLC3.
   2. Start the engine.
   3. Drive the vehicle at a speed of 24 mph (35 km/h) or more for approximately 5 seconds.

      HINT:

      The 4WD control ECU acquires steering angle sensor zero point every time the engine switch is turned on (IG) and vehicle is driven at 24 mph (35 km/h) or more for approximately 5 seconds. The ECU stores the previous zero point.

   4. Select the "DATA LIST" on the intelligent tester (See DATA LIST / ACTIVE TEST  ).

      DATA LIST: 4WD 

      DATA LIST REFERENCE (4WD)
      
      

      Item	Measurement Item/Range (Display)	Normal Condition
      STEERING ANGLE	Steering Angle Value/	Left: -3276.8 deg
      	Min.: -3276.8 deg	Center: Approx. 0 deg
      	Max.: 3276.7 deg	Right: 3276.7 deg

   5. Check that the steering angle sensor value changes in accordance with the steering wheel movement.

   HINT:

   Steering sensor value displayed on the intelligent tester is as follows:

   • The steering wheel is centered: approximately 0 deg.
   • The steering wheel is fully turned to left: -3276.8 deg.
   • The steering wheel is fully turned to light: 3276.8 deg.

   Standard: 

   The steering angle sensor value changes in accordance with the steering wheel movement. 

   NG: Go to step   3 

   OK: REPLACE 4WD CONTROL ECU 

3. INSPECT STEERING ANGLE SENSOR (STEERING ANGLE SENSOR POWER SOURCE CIRCUIT) 
   1. Disconnect the steering angle sensor connector.
   2. Turn the engine switch on (IG).
   3. Measure the voltage according to the value(s) in VOLTAGE SPECIFIED CONDITION TABLE  .

   Standard voltage 

   VOLTAGE SPECIFIED CONDITION TABLE
   
   

   Tester Connection	Condition	Specified Condition
   J23-1 (IG) - Body ground	Engine switch on (IG)	10 to 14 V

   Fig 1: Identifying IG Connector Terminal

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   NG: REPAIR OR REPLACE HARNESS OR CONNECTOR (IG CIRCUIT) 

   OK: Go To Next Step 

4. INSPECT STEERING ANGLE SENSOR (STEERING ANGLE SENSOR GROUND CIRCUIT) 

1. Turn the engine switch off.
2. Measure the resistance according to the value(s) in RESISTANCE SPECIFIED CONDITION TABLE  .

Standard resistance 

Fig 2: Identifying ESS Connector Terminal

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Result 

B: PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE 

C: REPAIR OR REPLACE HARNESS OR CONNECTOR (ESS CIRCUIT) 

A: REPLACE STEERING ANGLE SENSOR