POWER STEERING MALFUNCTION INDICATOR LIGHT/POWER STEERING MALFUNCTION INDICATION DOES NOT TURN OFF EVEN THOUGH ENGINE HAS STARTED [ELECTRIC POWER STEERING (EPS)]


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Troubleshooting item

Power steering malfunction indicator light/power steering malfunction indication does not turn off even though engine has started

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
―  Engine speed signal malfunction
―  CAN wiring harness malfunction
•  Power steering malfunction indicator light/power steering malfunction indication circuit 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 ignition off and maintain this condition approx. 1 min.
•  Switch the ignition ON (engine on).
•  Using the M-MDS, perform the Electric Power Steering (EPS) control module DTC inspection.
•  Are any DTCs present?
Yes
Go to the applicable DTC inspection.
No
Go to the next step.
2
VERIFY POWER STEERING MALFUNCTION INDICATOR LIGHT/POWER STEERING MALFUNCTION INDICATION ILLUMINATION CONDITION
•  Switch the ignition ON (engine off or on).
•  Does the power steering malfunction indicator light/power steering malfunction indication turn off?
Yes
Malfunction may be temporary.
No
Go to the next step.
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).
―  EPS_NETWORK
•  Is the EPS_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.
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.
If the CAN communication is normal, perform the diagnosis from Step 1.