Dtc C1553 Pig Power Supply Overvoltage

Steering. Yaris. Ncp93, 131
Power Assist Systems. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK HARNESS AND CONNECTOR (IG)

CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BODY GROUND)

DTC C1553 PIG Power Supply Overvoltage


DESCRIPTION

If the power steering ECU assembly determines that the motor power source voltage and the IG voltage are not within the specified range, it stops the power assist as a fail-safe function.

DTC No.
DTC Detection Condition
Trouble Area
C1553
  1. PIG power source overvoltage
  2. IG power source overvoltage
  1. IG and PIG power source circuits
  2. Power steering ECU assembly

WIRING DIAGRAM


Yaris. Ncp93, 131.Power Assist Systems.Power Steering System (For Sedan). Dtc C1553 Pig Power Supply Overvoltage


INSPECTION PROCEDURE

NOTICE:
  1. If the power steering ECU assembly has been replaced, perform the torque sensor zero point calibration and assist map writing (YARIS_NCP93 RM000000OSZ018X.html).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.CHECK HARNESS AND CONNECTOR (IG)


    Yaris. Ncp93, 131.Power Assist Systems.Power Steering System (For Sedan). Dtc C1553 Pig Power Supply Overvoltage

  1. Disconnect the power steering ECU assembly connectors.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    D104-1 (IG) - A68-2 (PGND)
    		Ignition switch ON
    		11 to 14 V
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to Power Steering ECU Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


2.CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BODY GROUND)
Yaris. Ncp93, 131.Power Assist Systems.Power Steering System (For Sedan). Dtc C1553 Pig Power Supply Overvoltage

  1. Disconnect the power steering ECU assembly connector.

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

Standard Voltage:
Tester Connection
Switch Condition
Specified Condition
A68-1 (PIG) - Body ground
Ignition switch ON
11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A68-2 (PGND) - Body ground
    		Always
    		Below 1 Ω
    Text in Illustration
    *a
    		Rear view of wire harness connector
    (to Power Steering ECU Assembly)


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER STEERING ECU ASSEMBLY (YARIS_NCP93 RM000002XN603ZX.html)