POWER STEERING SYSTEM (for Sedan) > EPS Warning Light Circuit


DESCRIPTION

If the power steering ECU detects a malfunction, the EPS warning light comes on. At this time, the power steering ECU stores a DTC in its memory.

WIRING DIAGRAM


C120680E04


INSPECTION PROCEDURE

1.INSPECT CAN COMMUNICATION SYSTEM
  1. Using a Techstream, check for DTCs and confirm that there are no problems in the CAN communication system.

    OK:
    DTCs are not output.


NG
GO TO CAN COMMUNICATION SYSTEM (Click here)
OK


2.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.

HINT:
If the voltage is not standard value, inspect the IG power source circuit.


NG
INSPECT POWER SOURCE CIRCUIT (IG) (Click here)
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


4.REPLACE POWER STEERING ECU

NOTICE:
After replacing the power steering ECU, perform the torque sensor zero point calibration.

NEXT


5.CHECK EPS WARNING LIGHT (COMBINATION METER)
  1. Check that the EPS warning light on the combination meter does not come on.

    OK:
    The EPS warning light does not come on.


NG
REPLACE COMBINATION METER (Click here)
OK

END