DTC    C1552    PIG Power Supply Voltage Malfunction

DTC    C1554    Power Supply Relay Failure

for Preparation Click here


DESCRIPTION

This circuit supplies power to drive the power steering motor.

DTC No.
DTC Detection Condition
Trouble Area
C1552
This DTC is detected when power source voltage drops or remains high.
  1. EPS relay
  2. ECU-B fuse
  3. EPS fuse
  4. Wire harness or connector
  5. Power steering ECU assembly
C1554
This DTC is detected when the power source relay is stuck, or when an open circuit occurs in the power source relay.
  1. EPS relay
  2. ECU-B fuse
  3. EPS fuse
  4. Wire harness or connector
  5. Power steering ECU assembly

WIRING DIAGRAM


C106457E04


INSPECTION PROCEDURE

1.INSPECT FUSES (ECU-B, EPS FUSE)

  1. Check for continuity of the ECU-B and EPS fuses.

    OK:
    Continuity



NG
REPLACE FUSE
OK


2.INSPECT ELECTRIC POWER STEERING RELAY


    B057491E01

  1. Remove the EPS relay from the engine room R/B No.1.

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

    Resistance:
    Tester connection
    		Specified condition
    3 - 5
    		10 kΩ or higher
    3 - 5
    		Below 1 Ω
    (When battery voltage is applied to terminals 1 and 2)



NG
REPLACE ELECTRIC POWER STEERING RELAY
OK


3.CHECK HARNESS AND CONNECTOR (EPS RELAY - BATTERY)


    C106475E01

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

    Voltage:
    Tester connection
    		Condition
    		Specified condition
    1 - Body ground
    		Always
    		10 to 14 V
    5 - Body ground
    		Always
    		10 to 14 V



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.CHECK HARNESS AND CONNECTOR (EPS RELAY - POWER STEERING ECU ASSEMBLY)


    C106476E02

  1. Disconnect the A24 connector from the power steering ECU assembly.

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

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    A24-4 (PIG) - 3
    		Always
    		Below 1 Ω
    A24-11 (RLY) - 2
    		Always
    		Below 1 Ω
    A24-4 (PIG) - Body ground
    		Always
    		10 kΩ or higher
    A24-11 (RLY) - Body ground
    		Always
    		10 kΩ or higher
    A24-4 (PIG) - A24-11 (RLY)
    		Always
    		1 MΩ or higher

    NOTICE:
    If replacing the power steering ECU assembly, initialize the rotation angle sensor and calibrate the torque sensor zero point (Click here).



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER STEERING ECU ASSEMBLY