DTC C1595/55: Lost Communication with Steering Angle Sensor Module; DTC C15C4/68: Steering Angle Signal (Test Mode DTC) (08/2010 - 08/2011): 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 → See step   7 

A: Go to next step 

1. Check if a steering angle sensor that complies with the vehicle specifications is installed.

   OK

   A steering angle sensor that complies with the vehicle specification is installed.

NG → See step   6 

OK: Go to next step 

Fig 1: Identifying E84 Steering Control ECU Connector And E11 Steering Angle Sensor Connector

Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

1. Disconnect the E84 steering control ECU connector.
2. Disconnect the E11 steering angle sensor connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   E84-10 (SS1-) - E11-7 (SS1-)	Always	Below 1 Ω
   E84-19 (SS1+) - E11-8 (SS1+)
   E84-19 (SS1+) - Body ground	Always	10 kΩ or higher
   E84-10 (SS1-) - Body ground
   E84-19 (SS1+) - E84-10 (SS1-)

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

1. Disconnect the E84 steering control ECU connector.
   Fig 2: Identifying E84 Steering Control ECU Connector

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Move the shift lever to N.
3. Jack up the vehicle.
4. Check the waveform of the steering angle sensor using an oscilloscope.

   HINT: 

   The voltage must be measured with the steering angle sensor connector connected.

   Standard Voltage

   Tester Connection	Switch Condition	Specified Condition
   E84-19 (SS1+) - E84-10 (SS1-)	Engine switch on (IG), steering wheel rotated slowly	Pulse generation (0 to 5 V)

   HINT: 

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

NG → See step   6 

OK → See step   5