DTC    C1551/51    IG Power Supply Voltage Malfunction


DESCRIPTION

The power steering ECU distinguishes the ignition switch status as on or off through the IG power source circuit.

DTC No.
DTC Detection Condition
Trouble Area
C1551/51
Open or short in IG power source circuit with ignition switch on.
  1. ECU-IG fuse
  2. IG power source circuit
  3. Power steering ECU

WIRING DIAGRAM


C122311E02


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 "IG Power Supply" in the Data List and read the value displayed on the Techstream.


EMPS: 
Tester Display
Measurement Item/Range
Normal Condition
Diagnostic Note
IG Power Supply
ECU power source voltage: Minimum: 0.0000 V, Maximum: 20.1531 V
11 to 14 V: Ignition switch ON
-

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


OK
CHECK INTERMITTENT PROBLEMS (Click here)
NG


2.INSPECT FUSE (ECU-IG)


    C120678E01
  1. Remove the ECU-IG fuse from the instrument panel J/B.

  1. Check the resistance of the fuse.

    Standard resistance:
    Below 1 Ω


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


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


    F046436E01
  1. Disconnect the connectors from the power steering ECU.

  1. Measure the voltage and the resistance.

    Standard:
    Tester Connection
    Condition
    Specified Condition
    IG (D31-6) - Body ground
    Ignition switch on
    11 to 14 V
    PGND (A19-2) - Body ground
    Always
    Below 1 Ω


NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK

REPLACE POWER STEERING ECU (Click here)