Diagnosis By Symptom - Continuously Variable/Road Sensing Suspension (CV/RSS)

NO RSS DATA LOSS OF SERIAL COMMUNICATIONS OR POWER






Circuit Description
The Electronic Suspension Control Module communicates to the other electronic control modules on the vehicle via the CLASS 2 serial bus.

Conditions for Running the DTC
^ The ignition is on.
^ The fault is detected during three consecutive ignition cycles, or during the same ignition cycle after clearing the DTC with the scan tool.

Conditions for Setting the DTC
The DTC is also set when the power to the Electronic Suspension Control Module has been lost because of one or more of the following:
^ Loss of battery feed (loose terminals and/or fuses)
^ Loss of ignition feed (loose terminals and/or fuses)
^ Loss of a good CVRSS system ground
^ Malfunction of the internal Electronic Suspension Control Module.

The DTC is also set when the CVRSS control module is powered and operational, but is unable to communicate with the IPC because of an open, a short to ground, or a short to voltage on the CLASS 2 circuit.

Action Taken When the DTC Sets
^ The SERVICE RIDE CONTROL message will be displayed.
^ The vehicle speed may be limited, or the STABILITY REDUCED message will be displayed.

Conditions for Clearing the MIL/DTC
^ The scan tool can be used to clear the DTC.
^ The On-Board diagnostic CLEAR RSS CODES feature can be used to clear the DTC.

The DTC is saved as history when the IPC can communicate with the Electronic Suspension Control Module. The DTC will clear if the fault does not return after 50 consecutive ignition cycles.

Diagnostic Aids
A loss of RSS data serial communication or power may be the result of:
^ Electrical problems with the wiring harness.
^ Intermittent breaks in Class 2 communication caused by other controllers and/or wiring harness issues.

Refer to Testing for Intermittent and Poor Connections in Wiring Systems.

Test Description
The number(s) below refer to the step number(s) on the diagnostic table.
2. This step checks for an open ignition fuse.
3. This step checks for an open battery fuse.
4. This step checks for an open in the ground circuit.
6. This step checks for an open in the battery circuit.
8. This step checks for an open in the ignition circuit.
9. This step checks the CLASS 2 bus for a fault condition.
11. This step checks for a short to ground in the ignition circuit.
12. This step checks for a short to ground in the battery circuit.









No RSS Data Loss of Serial Communications or Power