C0559 - Variable Effort Steering

CIRCUIT DESCRIPTION
The Electrically Erasable Programmable Read Only Memory (EEPROM) stores the Electronic Variable Orifice (EVO)/Passlock module calibrations. The EVO/Passlock module performs internal tests on the EEPROM. The EVO/Passlock module indicates if any calibration faults (checksum errors) are current.

CONDITIONS FOR SETTING THE DTC
A code sets when the Electronic Variable Orifice (EVO)/Passlock module detects an internal calibration fault (checksum error).

ACTION TAKEN WHEN THE DTC SETS
The Electronic Variable Orifice (EVO)/Passlock module will not send any current to the power steering solenoid actuator. This will cause the retraction of the power steering solenoid actuator valve, providing maximum fluid flow and full power steering assist at all times.

CONDITIONS FOR CLEARING THE DTC
After the ignition is cycled, the properly programmed Electronic Variable Orifice (EVO)/Passlock module indicates no internal calibration faults (checksum errors).

DIAGNOSTIC AIDS
The Electrically Erasable Programmable Read Only Memory (EEPROM) is not removable from the EVO/Passlock module. Replace the module, if service is required. Refer to Electronic Variable Orifice (EVO)/Passlock Module Replacement.





TEST DESCRIPTION
The numbers below refer to the step numbers on the diagnostic table.
1. This step makes sure that the Variable Effort Steering System Check is completed.
2. This step checks if the EVO/Passlock module was previously replaced.