DTC    C1552    PIG Power Supply Voltage Malfunction

DTC    C1554    Power Supply Relay Failure


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 each relay is built into the ECU.

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

WIRING DIAGRAM


C239972E02


INSPECTION PROCEDURE

NOTICE:
  1. If the power steering ECU assembly has been replaced, perform the torque sensor zero point calibration and assist map writing (Click here).
  2. Inspect the fuses for circuits related to this system before performing the following inspection procedure.
1.READ VALUE USING TECHSTREAM (PIG POWER SUPPLY)
  1. Turn the ignition switch off.

  1. Connect the Techstream to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the Techstream on.

  1. Enter the following menus: Chassis / EMPS / Data List.

  1. Select the item PIG Power Supply in the Data List and read the value displayed on the Techstream.

    EMPS 
    Tester Display
    Measurement Item/Range
    Normal Condition
    Diagnostic Note
    PIG Power Supply
    Power source voltage to activate motor/
    Min.: 0.0000 V
    Max.: 20.1531 V
    11 to 14 V
    Ignition switch ON


NG
Go to step 2
OK

USE SIMULATION METHOD TO CHECK (Click here)  

2.CHECK HARNESS AND CONNECTOR (POWER STEERING ECU ASSEMBLY - BODY GROUND)
C233847E02
  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 (Click here)