DTC    C1552    PIG Power Supply Voltage Malfunction

DTC    C1554    Power Supply Relay Failure

for Preparation Click here


DESCRIPTION

When a problem occurs in the system, the power source relay circuit and the motor relay circuit are shut off to stop the power assist. The ECU must be replaced when there is a problem with the relays because the relays are built into the ECU.

DTC No.
DTC Detection Condition
Trouble Area
C1552
PIG power source circuit malfunction
  1. EPS fuse
  2. PIG power source circuit
  3. Power steering ECU
C1554
Power source relay circuit malfunction
  1. EPS fuse
  2. PIG power source circuit
  3. Power steering ECU

WIRING DIAGRAM


C160852E01


INSPECTION PROCEDURE

NOTICE:
If the power steering ECU has been replaced with a new one, perform the assist map writing and the torque sensor zero point calibration (Click here).
1.INSPECT FUSE (EPS FUSE)

  1. Remove the EPS fuse from the engine room relay block.

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

    Standard Resistance:
    Fuse
    		Condition
    		Specified Condition
    EPS fuse
    		Always
    		Below 1 Ω


NG
REPLACE FUSE
OK


2.CHECK HARNESS AND CONNECTOR (BATTERY - POWER STEERING ECU - BODY GROUND)


    C113534E02

  1. Disconnect the connector from the power steering ECU.

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

    Standard Voltage:
    Tester Connection
    		Switch Condition
    		Specified Condition
    A75-1 (PIG) - Body ground
    		Ignition switch on (IG)
    		11 to 14 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A75-2 (PGND) - Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER STEERING ECU (Click here)