EPS Warning Light Circuit

POWER ASSIST SYSTEMS: POWER STEERING SYSTEM: 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, perform assist map writing Programming and Relearning.

PROCEDURE

1. CHECK CONNECTOR CONNECTION CONDITION AND GROUND WIRE

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

OK:

The ECU wire 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 FOR DTC (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. CHECK HARNESS AND CONNECTOR (AUXILIARY 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.

4. CHECK ECU WIRE SUB-ASSEMBLY

(a) Connect the Ij2 connector to the ECU wire sub-assembly.





(b) Disconnect the power steering ECU assembly j3 and j2 connectors.

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

Standard Voltage:





(d) 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.

5. INSPECT COMBINATION METER ASSEMBLY

(a) Reconnect the power steering ECU assembly connector.

(b) Perform the Active Test of the combination meter assembly using the Techstream Scan Tool Testing and Procedures.

(c) Check the combination meter assembly.

OK:

The EPS warning light turns on or off in accordance with the Techstream operation.

HINT
If troubleshooting has been carried out according to Problem Symptoms Table, refer back to the table and proceed to the next step before replacing the part Power Steering System.

NG -- REPLACE COMBINATION METER ASSEMBLY Removal

OK -- REPLACE POWER STEERING ECU ASSEMBLY Removal