DTC C1231/31: Steering Angle Sensor Circuit Malfunction: Procedure

1. Clear the DTCs. Refer to DTC CHECK / CLEAR .
2. Turn the engine switch off.
3. Turn the engine switch on (IG) again and check that no CAN communication system DTC is output. Refer to DIAGNOSIS SYSTEM .
4. Drive the vehicle and turn the steering wheel to the right and left at a speed of 35 km/h (22 mph) and check that no speed sensor or yaw rate sensor DTCs are output. Refer to DTC CHECK / CLEAR .

   Result

   Result	Proceed to
   No CAN communication system DTCs and the speed sensor and yaw rate and acceleration sensor DTCs are output	A
   CAN communication system DTC is output	B
   Speed sensor or yaw rate sensor DTC is output	C

   HINT: 

   • If there is a malfunction in the speed sensor or the yaw rate sensor, an abnormal value may be output although the steering angle sensor is normal.
   • If speed sensor and yaw rate sensor DTCs are output simultaneously, repair these two sensors and inspect the steering angle sensor.

C → See step   6 

B → See step   5 

A: Go to next step 

1. Turn the engine switch off.
   Fig 1: Identifying Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Remove the steering wheel and the column cover lower.
3. Make sure that there is no looseness at the locking part and the connecting part of the connector.
4. Disconnect the steering angle sensor connector.
5. Measure the voltage according to the value(s) in the table below.

   Standard Voltage

   Tester Connection	Condition	Specified Condition
   J23-1 (IG) - Body ground	Engine switch on (IG)	11 to 14 V
   J23-3 (BAT) - Body ground	Always	11 to 14 V

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (POWER SOURCE CIRCUIT) 

OK: Go to next step 

1. Turn the engine switch off.
   Fig 2: Identifying Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   J23-2 (ESS) - Body ground	Always	Below 1 Ω

   HINT: 

   If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step. Refer to PROBLEM SYMPTOMS TABLE .

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR (GROUND CIRCUIT) 

OK → See step   4