Theory Of Operation

The Electric Power Steering (EPS) Module monitors the battery voltage level at the EPS supply voltage terminal for the following failure conditions:

• System Voltage Excessively Low
• System Voltage Low

If the EPS supply voltage is below the System Voltage Low or the Excessively Low threshold, the EPS will not supply power to the steering gear motor. A Diagnostic Trouble Code (DTC) is set when one of the diagnostic voltage thresholds is reached for a calibrated amount of time.