Continuously Variable Road Sensing Suspension (Cvrss)

Fig. 75 Code RS0050: Control Module Fault.:

TEST CONDITIONS:
The CVRSS module performs checks of all internal program and data memory spaces. Additionally various internal junctions and data communications are monitored for valid operation.

FAULT CONDITIONS:
If any controller hardware fault condition is detected a code is set.

ACTION TAKEN:
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 dampers are concurrently driven by a fixed PWM duty cycle which changes (generally increases) as a function of vehicle speed. Otherwise (if the fault condition is more severe), the control module will disable ALL dampers (by commanding 0% PWM duty and disabling the Damper Return circuits) and send a message to the Powertrain Control Module (PCM) to limit vehicle speed. In the latter case, the Magnetic Speed Variable Assist (MSVA) steering control will default to a medium assist level. In either case, the CVRSS control module will set the fault code and turn on the "SERVICE RIDE CONTROL" message.

DESCRIPTION:
The CVRSS control module performs internal checks to ensure valid operation. If a fault condition is detected the CVRSS control module will set the fault code and turn on the "SERVICE RIDE CONTROL" message. Additionally, depending upon the severity of the internal fault the system will either enter a "Speed Dependent Damping" mode or disable all dampers. In the latter case the MSVA steering control will default to a medium assist level and a message will be sent to the PCM to cause vehicle speed to be limited. Recovery from any controller hardware fault condition is attempted only after ignition is cycled off and on.

NOTES ON FAULT TREE:
1. Service replacement control modules will have a code RSOO51 stored in memory when shipped. After replacement of a control module the following procedures must be performed:

^ CVRSS control module calibration
^ Steering Auto-center Adjustment.
^ ELC trim height adjustment. Adjustments

2. Clear codes. Clearing Diagnostic Trouble Codes