DTC    C1552    PIG Power Supply Voltage Malfunction

DTC    C1554    Power Supply Relay Failure

for Preparation Click here


DESCRIPTION

When a problem occurs in the power steering system, the power source relay circuit is shut off to stop the power assist.

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

WIRING DIAGRAM


C160852E17


INSPECTION PROCEDURE

NOTICE:
If the steering column assembly or power steering ECU assembly has been replaced, perform rotation angle sensor value initialization and torque sensor zero point calibration (Click here).

HINT:
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

1.READ VALUE USING INTELLIGENT TESTER (PIG POWER SUPPLY)

  1. Turn the power switch off.

  1. Connect the intelligent tester to the DLC3.

  1. Turn the power switch on (READY).

  1. Turn the intelligent tester 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 intelligent tester.

    EMPS 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    PIG Power Supply
    		PIG power supply/
    Min.: 0 V
    Max.: 20.1531 V
    		9 to 16 V
    		Power switch on (READY) and steering wheel being turned

    OK:
    The normal condition value is displayed on the intelligent tester.



NG
Go to step 2
OK

CHECK INTERMITTENT PROBLEMS (Click here)  

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


    C113534E26

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

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

    Standard Voltage:
    Tester Connection
    		Condition
    		Specified Condition
    A26-1 (PIG) - Body ground
    		Always
    		9 to 16 V

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    A26-2 (PGND) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *a
    		Front 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)