Ignition Cycle Counting

The Continuously Variable Road Sensing Suspension (CVRSS) control module employs a fault buffering approach known as "Ignition Cycle Counting." This allows degraded mode activation to occur whenever a fault condition is present, but requires a given fault to be active for several ignition cycles before a corresponding fault code is stored or the "SERVICE RIDE CONTROL" display is activated. This additional buffering is intended to reduce the occurrence of nuisance codes caused by intermittent problems.

It is important to note that intermittent fault conditions, although not causing "SERVICE RIDE CONTROL" activation or fault code storage, do cause activation of one or more system degraded modes. For example, an intermittent position sensor input fault causes the system to intermittently enter a speed-dependent damping mode in which the sensor information is not used; however, no "SERVICE RIDE CONTROL" message is displayed, nor a fault code stored, until the fault condition has been continually present for several ignition cycles. THUS, IF A VEHICLE IS BROUGHT IN WITH A COMPLAINT ABOUT RIDE QUALITY OR LEVELING SYSTEM OPERATION, BUT NO CVRSS FAULT CODES ARE STORED, ALWAYS PERFORM THE FOLLOWING STEPS BEFORE CONCLUDING THAT NO ELECTRICAL FAULT IS PRESENT.
1. Clear faults codes. (This will disable the "Ignition Cycle Counting" function for the current ignition cycle and thus allows any intermittent or new fault conditions which are present to result in fault codes).
2. Drive the vehicle above 50 MPH for at least 20 seconds.
3. Read fault codes.

If fault codes are now present, refer to the corresponding fault diagnostics. If there are still no fault codes stored then there are no electrical faults apparent in the system. Investigate mechanical causes for the complaint.