EPS Warning Light Circuit

POWER STEERING: POWER STEERING SYSTEM: EPS Warning Light Circuit
- EPS Warning Light Circuit

DESCRIPTION

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

WIRING DIAGRAM





INSPECTION PROCEDURE

PROCEDURE

1. INSPECT CAN COMMUNICATION SYSTEM

(a) 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
OK -- Continue to next step.

2. READ VALUE USING TECHSTREAM

(a) Connect a Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(c) Turn the Techstream on.

(d) Enter the following menus: Chassis / EMPS / Data List.

(e) Select the item "IG Power Supply" in the Data List and read the value displayed on the Techstream.

EMPS:

EMPS::

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)
OK -- Continue to next step.

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





(a) Disconnect the connectors from the power steering ECU.

(b) Measure the voltage and the resistance.

Standard:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.

4. REPLACE POWER STEERING ECU

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

NEXT -- Continue to next step.

5. CHECK PS WARNING LIGHT (COMBINATION METER)

(a) Check that the P/S warning light on the combination meter does not come on.

OK:

The P/S warning light does not come on.

NG -- REPLACE COMBINATION METER

OK -- END