General Inspection: Notes
After or before servicing the EPS system, perform the troubleshooting and test procedure as follows. Compare the system condition with normal condition in the table below and if abnormal symptom is detected, perform necessary remedy and inspection.
| Test condition | Normal condition: Motor must not supply steering assist. | ||
|---|---|---|---|
| Symptom | Possible cause | Remedy | |
| IG Off | Motor supplies steering assist. | IG power supplies | Inspect the IG power supply line |
| Test condition | Normal condition: Motor must not supply steering assist, Warning lamp is illuminated. | ||
|---|---|---|---|
| Symptom | Possible cause | Remedy | |
| IG On/Engine Off | Motor supplies steering assist. | EMS CAN signal is not received | Inspect the EMS1 CAN message (ID 0 31.6)
|
| Warning lamp is not illuminated. | Cluster fault | Inspect the cluster and cluster harness | |
| Test condition | Normal condition: Motor supplies steering assist, Warning lamp is not illuminated. | ||
|---|---|---|---|
| Symptom | Possible cause | Remedy | |
| IG On/Engine On | Warning lamp is illuminated and Motor does not supply steering assist. | EPS (Hot at all times) and IG power supply fault | Inspect the connector and harness for EPS (Hot at all times) and IG power supply line. |
| DTC is detected by system. | Perform the self test using a scan tool and repair or replace. | ||
| Warning lamp is illuminated and Motor supplies steering assist. | CAN communication between EPS and cluster is fault | Inspect the CAN line | |
| CAN: Controller Area Network EMS: Engine Management System |
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CAUTION:
The following symptoms may occur during normal vehicle operation and if there is no EPS warning light illumination, it is not malfunction of EPS system.
- After turning the ignition switch on, the steering wheel becomes heavier while it performs EPS system diagnostics, for about 2 seconds, then it becomes normal steering condition.
- After turning the ignition switch on or off, EPS relay noise may occur but it is normal.
- When it is steered, while the vehicle is stopped or in low driving speed, motor noise may occur but it is normal operating one.