Inspection Procedure

1. Check the installation condition of the power steering ground wire connected to the power steering gear assembly.

   OK: The power steering ground wire is securely installed to the power steering gear assembly and body ground. 

NG: REINSTALL POWER STEERING GROUND WIRE 

ok: Go to next step 

1. Disconnect the C4 sensor connector.
Fig 1: Identifying C4 Sensor And C2 ECU Connector Terminals
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
2. Disconnect the C2 ECU connector.
3. Measure the resistance according to the value(s) in the table below.

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   C4-1 (RZSN) - C2-7 (RZSN)	Always	Below 1 Ω
   C4-2 (RZG) - C2-1 (RZG)	Always	Below 1 Ω
   C4-3 (RZV) - C2-3 (RZV)	Always	Below 1 Ω
   C4-4 (RZCS) - C2-8 (RZCS)	Always	Below 1 Ω
   C4-1 (RZSN) - Body ground	Always	10 kΩ or higher
   C4-2 (RZG) - Body ground	Always	10 kΩ or higher
   C4-3 (RZV) - Body ground	Always	10 kΩ or higher
   C4-4 (RZCS) - Body ground	Always	10 kΩ or higher

NG: REPAIR OR REPLACE HARNESS OR CONNECTOR 

OK: Go to next step 

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

   Standard resistance 

   RESISTANCE SPECIFICATION
   
   

   Tester Connection	Condition	Specified Condition
   C4-1 (RZSN) - C4-2 (RZG)	Always	50 to 140 Ω
   C4-3 (RZV) - C4-2 (RZG)	Always	50 to 140 Ω
   C4-4 (RZCS) - C4-2 (RZG)	Always	15 to 45 Ω

   Fig 2: Identifying Motor Rotation Angle Sensor Connector Terminals

   Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
   NOTE: If replacing the power steering gear assembly, clear the rotation angle sensor calibration value, initialize the rotation angle sensor value, and calibrate the torque sensor zero point (see CALIBRATION ).

   Result 

   RESULT CHART
   
   

   Result	Proceed to
   OK	A
   NG(for w/VGRS)	B
   NG(for w/o VGRS)	C

B: REPLACE POWER STEERING GEAR ASSEMBLY (w/ VGRS)  (See REMOVAL )

C: REPLACE POWER STEERING GEAR ASSEMBLY (w/o VGRS)  (See REMOVAL )

A: Go to next step 

1. Replace the power steering ECU (see REMOVAL ).

1. Initialize the rotation angle sensor value and calibrate the torque sensor zero point (see CALIBRATION ).

1. Check for DTCs (see DTC CHECK / CLEAR ).

   Result 

   RESULT CHART
   
   

   DTC Condition	Proceed to
   DTC C1528 is not output	A
   DTC C1528 is output (for w/ VGRS)	B
   DTC C1528 is output (for w/o VGRS)	C

   NOTE: If replacing the power steering gear assembly, clear the rotation angle sensor calibration value, initialize the rotation angle sensor value, and calibrate the torque sensor zero point (see CALIBRATION ).

B: REPLACE POWER STEERING GEAR ASSEMBLY (w/ VGRS)  (See REMOVAL )

C: REPLACE POWER STEERING GEAR ASSEMBLY (w/o VGRS)  (See REMOVAL )

A: END