C1658

CIRCUIT DESCRIPTION
The Continuously Variable Road Sensing Suspension (CVRSS) control module performs checks of internal calibration data. If a fault condition is detected, the CVRSS control module will set the fault code, and may, depending upon the fault type, turn on the "SERVICE RIDE CONTROL" message. Additionally, depending upon the type of the internal fault, the system will either enter a "Speed Dependent Damping" mode or disable all dampers. In the latter case, a message will be sent to the Powertrain Control Module (PCM) to cause vehicle speed to be limited. Recovery from any controller fault condition is attempted only after ignition is cycled off and on.

CONDITION FOR SETTING THE CODE "CURRENT"
Any calibration faults, internal to the CVRSS controller, are detected.

ACTIONS TAKEN WHEN CODE SETS
Depending upon which internal functions are affected by the fault condition, the CVRSS control module will take one of two sets of actions:
^ If the fault condition allows continued output operation, the system will enter a "Speed Dependent Damping" mode, in which all four corners of the vehicle are concurrently driven by a fixed Pulse Width Modulator (PWM) duty cycle, which increases as a function of vehicle speed.
^ If the fault is more severe, the control module will disable ALL dampers by commanding 0% PWM duty cycle, disabling the damper switched battery circuit, and sending a message to the PCM to limit vehicle speed.

CONDITION FOR CODE TURNING "HISTORY"
The CVRSS control module no longer senses the hardware fault and the ignition is cycled OFF and ON.

TEST DESCRIPTION
The numbers below refer to step numbers on the diagnostic table.
2./3. Recalibrate the CVRSS control module and check to see if problem has cleared.