POWER STEERING MALFUNCTION INDICATOR LIGHT/POWER STEERING MALFUNCTION INDICATION DOES NOT TURN OFF EVEN THOUGH MAIN POWER SWITCHED ON (READY ON) [ELECTRIC POWER STEERING (EPS)]

id0603a2808900

Troubleshooting item

Power steering malfunction indicator light/power steering malfunction indication does not turn off even though main power switched ON (READY on)

Possible cause

•  EPS system malfunction.

―  Wiring harness malfunction

―  Connector condition malfunction

―  Torque sensor malfunction

―  EPS motor malfunction

―  Fuse malfunction

―  Electric Power Steering (EPS) control module malfunction

•  Electric Power Steering (EPS) control module detects an EPS system malfunction even though the EPS system is normal.

•  CAN communication line and/or CAN signal malfunction.

―  Vehicle speed signal malfunction

―  Power source status malfunction

―  CAN wiring harness malfunction

•  Power steering malfunction indicator light/power steering malfunction indication malfunction in the instrument cluster.

•  CAN wiring harness malfunction.

―  Malfunction in wiring harness between Electric Power Steering (EPS) control module and instrument cluster

•  Body control module (BCM) configuration procedure was not completed properly.

Troubleshooting item	Power steering malfunction indicator light/power steering malfunction indication does not turn off even though main power switched ON (READY on)
Possible cause	• EPS system malfunction. ― Wiring harness malfunction ― Connector condition malfunction ― Torque sensor malfunction ― EPS motor malfunction ― Fuse malfunction ― Electric Power Steering (EPS) control module malfunction • Electric Power Steering (EPS) control module detects an EPS system malfunction even though the EPS system is normal. • CAN communication line and/or CAN signal malfunction. ― Vehicle speed signal malfunction ― Power source status malfunction ― CAN wiring harness malfunction • Power steering malfunction indicator light/power steering malfunction indication malfunction in the instrument cluster. • CAN wiring harness malfunction. ― Malfunction in wiring harness between Electric Power Steering (EPS) control module and instrument cluster • Body control module (BCM) configuration procedure was not completed properly.

Diagnostic Procedure

Step

Inspection

Results

Action

1

VERIFY ELECTRIC POWER STEERING (EPS) CONTROL MODULE DTCS

•  Switch the main power OFF and maintain this condition approx. 1 min.

•  Switch the main power ON (READY on).

•  Using the M-MDS, perform the Electric Power Steering (EPS) control module DTC inspection.
(See DTC INSPECTION.)

•  Are any DTCs present?

Yes

Go to the applicable DTC inspection.

(See DTC TABLE [ELECTRIC POWER STEERING (EPS) CONTROL MODULE].)

No

Go to the next step.

2

VERIFY POWER STEERING MALFUNCTION INDICATOR LIGHT/POWER STEERING MALFUNCTION INDICATION ILLUMINATION CONDITION

•  Main power is switched ON (READY on).

•  Does the power steering malfunction indicator light/power steering malfunction indication turn off?

Yes

Go to the next step.

No

Malfunction may be temporary.

3

VERIFY COMMUNICATION CONDITION BETWEEN ELECTRIC POWER STEERING (EPS) CONTROL MODULE AND BODY CONTROL MODULE (BCM)

•  Using the M-MDS, display the following PIDs for the body control module (BCM).
(See PID/DATA MONITOR INSPECTION.)

―  EPAS_NETWORK

•  Is the EPAS_NETWORK PID value Node Attached and Communicate correctly?

Yes

Perform the body control module (BCM) configuration, then repeat the inspection from Step 1.

If the malfunction recurs, replace the instrument cluster.

No

Electric Power Steering (EPS) control module malfunction. Replace the Electric Power Steering (EPS) control module.

(See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.)

Perform the repair completion verification.

Repair completion verification

VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR

•  Install/connect the part removed/disconnected during the troubleshooting procedure.

•  Has the malfunction symptom been eliminated?

Yes

Complete the symptom troubleshooting.

Explain to the customer what has been repaired.

No

Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error.

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].)

(See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].)

If the CAN communication is normal, perform the diagnosis from Step 1.

Step	Inspection	Results	Action
1	VERIFY ELECTRIC POWER STEERING (EPS) CONTROL MODULE DTCS • Switch the main power OFF and maintain this condition approx. 1 min. • Switch the main power ON (READY on). • Using the M-MDS, perform the Electric Power Steering (EPS) control module DTC inspection. (See DTC INSPECTION.) • Are any DTCs present?	Yes	Go to the applicable DTC inspection. (See DTC TABLE [ELECTRIC POWER STEERING (EPS) CONTROL MODULE].)
1		No	Go to the next step.
2	VERIFY POWER STEERING MALFUNCTION INDICATOR LIGHT/POWER STEERING MALFUNCTION INDICATION ILLUMINATION CONDITION • Main power is switched ON (READY on). • Does the power steering malfunction indicator light/power steering malfunction indication turn off?	Yes	Go to the next step.
2		No	Malfunction may be temporary.
3	VERIFY COMMUNICATION CONDITION BETWEEN ELECTRIC POWER STEERING (EPS) CONTROL MODULE AND BODY CONTROL MODULE (BCM) • Using the M-MDS, display the following PIDs for the body control module (BCM). (See PID/DATA MONITOR INSPECTION.) ― EPAS_NETWORK • Is the EPAS_NETWORK PID value Node Attached and Communicate correctly?	Yes	Perform the body control module (BCM) configuration, then repeat the inspection from Step 1. If the malfunction recurs, replace the instrument cluster.
3		No	Electric Power Steering (EPS) control module malfunction. Replace the Electric Power Steering (EPS) control module. (See STEERING WHEEL AND COLUMN REMOVAL/INSTALLATION.) Perform the repair completion verification.
Repair completion verification	VERIFY THAT MALFUNCTION SYMPTOMS DO NOT RECUR AFTER REPAIR • Install/connect the part removed/disconnected during the troubleshooting procedure. • Has the malfunction symptom been eliminated?	Yes	Complete the symptom troubleshooting. Explain to the customer what has been repaired.
Repair completion verification		No	Refer to the controller area network (CAN) malfunction diagnosis flow to inspect for a CAN communication error. (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [L.H.D. (E)].) (See CONTROLLER AREA NETWORK (CAN) MALFUNCTION DIAGNOSIS FLOW [R.H.D.].) If the CAN communication is normal, perform the diagnosis from Step 1.