DTC C1595/55: Lost Communication with Steering Angle Sensor Module; DTC C15C4/68: Steering Angle Signal (Test Mode DTC): Procedure

1. Check for DTCs in the CAN communication system. Refer to DIAGNOSIS SYSTEM .
   RESULT
   
   

   Result	Proceed to
   DTC is not output	A
   DTC is output	B

B → GO TO CAN COMMUNICATION SYSTEM (HOW TO PROCEED WITH TROUBLESHOOTING) 

A: Go to next step 

1. Check that a steering angle sensor with the specified part number is installed.

   Standard

   A steering angle sensor with the specified part number (89245-30070) is installed.

NG → REPLACE STEERING ANGLE SENSOR 

OK: Go to next step 

1. Turn the engine switch off.
   Fig 1: Disconnecting Connectors From Steering Control ECU And Steering Angle Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the connectors from the steering control ECU and the steering angle sensor.
3. Measure the resistance according to the value(s) in the table below.

   Resistance

   Tester connection	Specified condition
   K70-10 (SS1-) - K19-7 (SS1-)	Below 1 Ω
   K70-19 (SS1+) - K19-8 (SS1+)	Below 1 Ω
   K70-19 (SS1+) - Body ground	10 kΩ or higher
   K70-10 (SS1-) - Body ground	10 kΩ or higher
   K70-19 (SS1+) - K70-10 (SS1-)	1 kΩ or higher

NG → REPAIR OR REPLACE WIRE HARNESS 

OK: Go to next step 

1. Connect the connector to the steering angle sensor.
   Fig 2: Checking Steering Angle Sensor

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Adjust the shift lever to neutral.
3. Jack up the vehicle.
4. Turn the engine switch on (IG).
5. Check the signal waveform according to the condition in the table below.

   Voltage

   Tester connection	Condition	Specified condition
   K70-19 (SS1+) - K70-10 (SS1-)	Engine switch on (IG), rotate steering wheel slowly	Pulse generation (0 ←→ 5 V)

   HINT: 

   The output voltage should fluctuate up and down similarly to the diagram on the left when the wheel is turned slowly.

NG → REPLACE STEERING ANGLE SENSOR 

OK → REPLACE STEERING CONTROL ECU