C1521 Motor overcurrent

DESCRIPTION

The power steering ECU assembly supplies current to the power steering motor through this circuit.

DTC No.	DTC Detection Item	Trouble Area
C1521	Motor overcurrent	Wire harness or connector Power steering motor (built into power steering link assembly) Power steering ECU assembly
C1522	Motor current sensor malfunction	Wire harness or connector Power steering motor (built into power steering link assembly) Power steering ECU assembly
C1523	Excessively large current deviation	Wire harness or connector Power steering motor (built into power steering link assembly) Power steering ECU assembly
C1524	Voltage error between motor terminals	Wire harness or connector Power steering motor (built into power steering link assembly) Power steering ECU assembly

WIRING DIAGRAM

INSPECTION PROCEDURE

1. CHECK HARNESS AND CONNECTOR (BETWEEN POWER STEERING ECU ASSEMBLY AND POWER STEERING MOTOR)

1. Disconnect the P42 connector from the power steering ECU assembly.

2. Disconnect the P44 connector from the power steering motor.

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

   Resistance:

   Tester connection (Symbols)	Condition	Specified condition
   P42-5 (U) - P44-3 (U)	Always	Below 1 Ω
   P42-11 (V) - P44-2 (V)	Always	Below 1 Ω
   P42-6 (W) - P44-1 (W)	Always	Below 1 Ω
   P42-5 (U) - Body ground	Always	10 kΩ or higher
   P42-11 (V) - Body ground	Always	10 kΩ or higher
   P42-6 (W) - Body ground	Always	10 kΩ or higher

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR

OK

2. INSPECT POWER STEERING LINK ASSEMBLY (POWER STEERING MOTOR)

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

   Resistance:

   Tester connection (Symbols)	Condition	Specified condition
   P44-3 (U) - P44-2 (V)	Always	Below 1 Ω
   P44-2 (V) - P44-1 (W)	Always	Below 1 Ω
   P44-1 (W) - P44-3 (U)	Always	Below 1 Ω

   NOTICE:

   1. If replacing the power steering link assembly, clear the rotation angle sensor calibration value, initialize the rotation angle sensor value, and calibrate the torque sensor zero point (Click here ).
      
   2. If replacing the power steering ECU assembly, initialize the rotation angle sensor value and calibrate the torque sensor zero point (Click here).
      

NG	REPLACE POWER STEERING LINK ASSEMBLY

OK
REPLACE POWER STEERING ECU ASSEMBLY