Power Steering System (For Sedan) Eps Warning Light Circuit

Steering. Yaris. Ncp93, 131
Power Assist Systems. Yaris. Ncp93, 131

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

INSPECT CAN COMMUNICATION SYSTEM

READ VALUE USING TECHSTREAM

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

REPLACE POWER STEERING ECU

CHECK EPS WARNING LIGHT (COMBINATION METER)

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


Yaris. Ncp93, 131.Power Assist Systems.Power Steering System (For Sedan).Power Steering System (For Sedan) Eps Warning Light Circuit


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 (YARIS_NCP93 RM000001D3500JX.html)
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) (YARIS_NCP93 RM000001CJG02FX_04_0001.html)
OK


3.CHECK HARNESS AND CONNECTOR (POWER STEERING ECU - BODY GROUND)
Yaris. Ncp93, 131.Power Assist Systems.Power Steering System (For Sedan).Power Steering System (For Sedan) Eps Warning Light Circuit

  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 (YARIS_NCP93 RM000000IN001JX.html)
OK

END