DTC C15A3/63: Motor Rotation Angle Not Detected; DTC C15C5/69: Motor Rotation Signal Not Detected [01/2017 - 09/2018]: Procedure

1. Check for DTCs.

   Refer to DTC CHECK / CLEAR [01/2017 - 09/2018]

   Chassis > VGRS > Trouble Codes 

   Result

   Result	Proceed to
   DTC C15A3/63 is output as a current DTC When the power switch is turned on (READY) and the steering wheel is operated, DTC C15A3/63 is output as a current DTC.	A
   When the power switch is turned on (READY) and a wire harness is jiggled, DTC C15A3/63 is output as a current DTC.	B
   DTC C15A3/63 is not output as a current DTC	C

Result: 

B 

REPAIR OR REPLACE HARNESS OR CONNECTOR 

Result: 

C 

USE SIMULATION METHOD TO CHECK. Refer to  HOW TO PROCEED WITH TROUBLESHOOTING [01/2017 - 04/2020] 

Result: 

A 

See step  2

1. Turn the power switch off.
2. Connect the Techstream to the DLC3.
3. Turn the power switch on (IG).
4. Turn the Techstream on.
5. Display the DTCs on the Techstream screen.

   Refer to DTC CHECK / CLEAR [01/2017 - 09/2018]

   Chassis > VGRS > Trouble Codes 

6. Select DTC "C15A3/63", and check the freeze frame data for "Motor Resolver SIN Phase Offset" and "Motor Resolver COS Phase Offset".

   Refer to FREEZE FRAME DATA [01/2017 - ]

   Result

   Result	Proceed to
   "Motor Resolver SIN Phase Offset" and "Motor Resolver COS Phase Offset" are 5 V or higher	A
   "Motor Resolver SIN Phase Offset" and "Motor Resolver COS Phase Offset" are below 5 V	B

Result: 

B 

REPLACE VGRS ECU (FRONT STEERING CONTROL ECU). Refer to  REMOVAL [01/2017 - 05/2023] 

Result: 

A 

See step  3

1. Turn the power switch off.
2. Disconnect the P71 VGRS ECU (front steering control ECU) connector.

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

   *a	Front view of wire harness connector (to VGRS ECU [Front Steering Control ECU])

3. Measure the resistance according to the value(s) in the table below.

   HINT: 

   Measure the resistance of the steering actuator assembly at the connector of the VGRS ECU (front steering control ECU).

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P71-9 (RV) - P71-8 (RG)	Always	20 to 60 Ω
   P71-3 (S1) - P71-8 (RG)	Always	70 to 160 Ω
   P71-5 (S2) - P71-8 (RG)	Always	60 to 150 Ω
   P71-9 (RV) - P71-3 (S1)	Always	90 to 220 Ω
   P71-9 (RV) - P71-5 (S2)	Always	80 to 210 Ω
   P71-3 (S1) - P71-5 (S2)	Always	130 to 310 Ω
   P71-3 (S1) - Body ground	Always	100 kΩ or higher
   P71-5 (S2) - Body ground	Always	100 kΩ or higher
   P71-8 (RG) - Body ground	Always	100 kΩ or higher
   P71-9 (RV) - Body ground	Always	100 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE VGRS ECU (FRONT STEERING CONTROL ECU). Refer to  REMOVAL [01/2017 - 05/2023] 

Result: 

NG 

See step  4

1. Turn the power switch off.
2. Disconnect the P71 VGRS ECU (front steering control ECU) connector.
3. Disconnect the P24 steering actuator assembly connector.
4. Measure the resistance according to the value(s) in the table below.

   Standard Resistance

   Tester Connection	Condition	Specified Condition
   P71-3 (S1) - P24-2 (S1+)	Always	Below 1 Ω
   P71-5 (S2) - P24-9 (S2+)	Always	Below 1 Ω
   P71-8 (RG) - P24-10 (RG+)	Always	Below 1 Ω
   P71-9 (RV) - P24-1 (RV+)	Always	Below 1 Ω
   P71-9 (RV) - P71-8 (RG)	Always	20 to 60 Ω
   P71-3 (S1) - P71-8 (RG)	Always	70 to 160 Ω
   P71-5 (S2) - P71-8 (RG)	Always	60 to 150 Ω
   P71-9 (RV) - P71-3 (S1)	Always	90 to 220 Ω
   P71-9 (RV) - P71-5 (S2)	Always	80 to 210 Ω
   P71-3 (S1) - P71-5 (S2)	Always	130 to 310 Ω
   P71-3 (S1) or P24-2 (S1+) - Body ground	Always	100 kΩ or higher
   P71-5 (S2) or P24-9 (S2+) - Body ground	Always	100 kΩ or higher
   P71-8 (RG) or P24-10 (RG+) - Body ground	Always	100 kΩ or higher
   P71-9 (RV) or P24-1 (RV+) - Body ground	Always	100 kΩ or higher

   Result

   Proceed to
   OK
   NG

Result: 

OK 

REPLACE STEERING ACTUATOR ASSEMBLY. Refer to  REMOVAL [01/2017 - 05/2023] 

Result: 

NG 

REPAIR OR REPLACE HARNESS OR CONNECTOR