POWER STEERING SYSTEM, Diagnostic DTC:C1551

DTC Code DTC Name
C1551 IG Power Supply Voltage

DESCRIPTION

The power steering ECU assembly distinguishes the engine switch status as on (IG) or off through the IG power source circuit.

DTC No. Detection Item DTC Detection Condition Trouble Area Warning Indicate Note
C1551 IG Power Supply Voltage

Any of the following conditions is met:


  • Open in IG power source circuit with engine switch on (IG)

  • Short in IG power source circuit with engine switch on (IG)

  • EPS-IG fuse

  • IG power source circuit

  • Power steering ECU assembly

 EPS warning light: Comes on -
DTC Detection Conditions
Vehicle Condition
Pattern 1 Pattern 2
Diagnosis Condition Engine switch on (IG) ○ ○
Malfunction Status Open in IG power source circuit ○ -
Short in IG power source circuit - ○
Detection Time - -
Number of Trips 1 trip 1 trip

Tech Tips

DTC will be output when conditions for either of the patterns in the table above are met.

WIRING DIAGRAM

B002DDRE11
*1 from RR-IG1 RLY 1 Relay
*2 Power Steering ECU Assembly

CAUTION / NOTICE / HINT

Note


  • If the power steering ECU assembly has been replaced, perform assist map writing, rotation angle sensor initialization and torque sensor zero point calibration.

    Click here

  • Inspect the fuses for circuits related to this system before performing the following procedure.

PROCEDURE


  1. CHECK CONNECTORS


    1. Check the connection of the power steering ECU assembly connector.

    2. Visually inspect the terminals of the power steering ECU assembly connector.

      Result
      Result Proceed to
      Normal A
      Connectors not properly connected B
      Power steering ECU assembly connector terminals abnormal (for LHD) C
      Power steering ECU assembly connector terminals abnormal (for RHD) D

    B

    CONNECT CONNECTORS PROPERLY

    C

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    D

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    A

  2. CHECK HARNESS AND CONNECTOR (IG POWER SUPPLY - GROUND)


    1. Disconnect the power steering ECU assembly connector.

    2. B002CJ2C70
      *a

      Front view of wire harness connector

      (to Power Steering ECU Assembly)

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      A19-14 (IG) - Body ground Engine switch on (IG) 8 to 16 V

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A19-9 (PGND) - Body ground Always Below 1 Ω
      Result
      Result Proceed to
      OK (for LHD) A
      OK (for RHD) B
      NG C

    A

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    B

    REPLACE POWER STEERING ECU ASSEMBLY Click here

    C

    REPAIR OR REPLACE HARNESS OR CONNECTOR