Failure Modes

When a DTC is present in the PSCM, the EPAS enters 1 of 2 modes of operation.

The EPAS system enters a reduced steering assist mode  to protect the internal components of the EPAS gear when a concern is detected by the PSCM such as low battery voltage, high battery voltage or over-temperature concerns which are not considered to be a critical safety concern. This reduced steering assist mode gives the steering a heavier than normal feel.

The EPAS system enters a manual steering mode  (no electrical steering assistance is provided) when a concern which is considered to be a critical safety concern is detected. In manual steering mode the vehicle has mechanical steering operation only, which gives steering operation a heavy feel.