DTC    C1552/52    PIG Power Source Circuit

DTC    C1553/53    When Resetting Voltage, Vehicle is Being Driven

DTC    C1554/54    EPS Relay Circuit

DTC    C1555/55    EPS Motor Relay Circuit


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
C1552/52
PIG power source circuit malfunction
  1. EPS fuse
  2. PIG power source circuit
  3. Power steering ECU
C1553/53
Abnormal overvoltage
  1. IG and PIG power source circuit
  2. Power steering ECU
C1554/54
Power source relay circuit malfunction
  1. EPS fuse
  2. PIG power source circuit
  3. Power steering ECU
C1555/55
Motor relay circuit malfunction
  1. Power steering ECU

WIRING DIAGRAM


C117905E01


INSPECTION PROCEDURE

1.READ VALUE USING TECHSTREAM
  1. Connect a 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: Minimum: 0.0000 V, Maximum: 20.1531 V
11 to 14 V: Always
-

OK:
The normal condition value is displayed on the Techstream.


OK
CHECK INTERMITTENT PROBLEMS (Click here)
NG


2.INSPECT FUSE (EPS FUSE)
C117909E01
  1. Remove the EPS fuse from the engine room R/B.

  1. Measure the resistance of the fuse.

    Standard resistance:
    Below 1Ω


NG
INSPECT SHORT CIRCUIT IN COMPONENTS AND WIRES CONNECTED TO FUSE
OK


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


    F046438E02
  1. Disconnect the connector from the power steering ECU.

  1. Measure the voltage and the resistance.

    Standard:
    Tester Connection
    Condition
    Specified Condition
    PIG (A19-1) - Body ground
    Always
    11 to 14 V
    PGND (A19-2) - Body ground
    Always
    Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


4.INSPECT STEERING COLUMN ASSEMBLY (POWER STEERING MOTOR)


    F046435E01
  1. Disconnect the connector from the power steering ECU.

  1. Measure the resistance.

    Standard resistance:
    Tester Connection
    Condition
    Specified Condition
    M1 (b1-1) - M2 (b1-2)
    Always
    0.08 to 0.15 Ω
    M1 (b1-1) - Body ground
    Always
    1 MΩ or higher
    M2 (b1-2) - Body ground
    Always
    1 MΩ or higher


NG
REPLACE STEERING COLUMN ASSEMBLY (Click here)
OK

REPLACE POWER STEERING ECU (Click here)