EPS Warning Light Circuit

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM (for 2AR-FE with Wireless Door Lock): EPS Warning Light Circuit
- EPS Warning Light Circuit

DESCRIPTION

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

WIRING DIAGRAM





INSPECTION PROCEDURE

NOTICE:
If the power steering ECU assembly has been replaced with a new one, perform assist map writing and torque sensor zero point calibration 2AR-FE with Wireless Door Lock.

HINT
Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE

1. CHECK CONNECT CONNECTOR OR INSTALL GROUND WIRE

(a) Check the connection condition of the electric power steering column sub-assembly and power steering ECU assembly connectors.

OK:

The electric power steering column sub-assembly and power steering ECU assembly connectors are securely connected.

(b) Check that the ground wire is securely installed with the bolt Installation.

OK:

The ground wire is securely installed with the bolt.

NG -- CONNECT CONNECTOR OR INSTALL GROUND WIRE Installation
OK -- Continue to next step.

2. CHECK CAN COMMUNICATION SYSTEM

(a) Check for DTCs Diagnosis System.

OK:

DTC is not output.

NG -- GO TO CAN COMMUNICATION SYSTEM How to Proceed With Troubleshooting
OK -- Continue to next step.

3. READ VALUE USING TECHSTREAM

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

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

(f) Select the item "IG power supply" in the Data List and read the value displayed on the Techstream.

EMPS





OK:

The normal condition value is displayed on the Techstream.

NG -- CHECK WIRE HARNESS AND CONNECTOR (BATTERY - ECU WIRE SUB-ASSEMBLY)

OK -- REPLACE POWER STEERING ECU ASSEMBLY Removal

4. CHECK WIRE HARNESS AND CONNECTOR (BATTERY - ECU WIRE SUB-ASSEMBLY)

(a) Disconnect the Ij2 connector from the ECU wire sub-assembly.





(b) Measure the voltage according to the value(s) in the table below.

Standard Voltage:





Text in Illustration





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

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

(a) Disconnect the j2 connector from the power steering ECU assembly.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE ECU WIRE SUB-ASSEMBLY Disassembly
OK -- Continue to next step.

6. CHECK ECU WIRE SUB-ASSEMBLY

(a) Disconnect the j1 connector from the power steering ECU assembly.





(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:





Text in Illustration





NG -- REPAIR OR REPLACE ECU WIRE SUB-ASSEMBLY Disassembly
OK -- Continue to next step.

7. PERFORM ACTIVE TEST USING TECHSTREAM

(a) Turn the ignition switch off.

(b) Connect the Techstream to the DLC3.

(c) Turn the ignition switch to ON.

(d) Turn the Techstream on.

(e) Enter the following menus: Body Electrical / Combination Meter / Active Test.

(f) Perform the Active Test of the combination meter assembly using the Techstream.

Combination Meter





(g) Check that the EPS warning light operates in accordance with the Active Test.

HINT
Reconnect the connectors and restore the vehicle to its previous condition before checking the combination meter assembly.

NG -- REPLACE COMBINATION METER ASSEMBLY Removal

OK -- REPLACE POWER STEERING ECU ASSEMBLY Removal