Symptom Related Diagnostic Procedures

"NO RSS DATA" LOSS OF SERIAL COMMUNICATION








CIRCUIT DESCRIPTION
The Continuously Variable Road Sensing Suspension (CVRSS) control module communicates to the other electronic control modules on the vehicle via the CLASS 2 serial bus.

CONDITIONS FOR SETTING THE DTC
The Diagnostic Trouble Code (DTC) is set when the power to the CVRSS control module has been lost because of one or more of the following:
^ The loss of battery feed (loose terminals and/or fuses)
^ The loss of ignition feed (loose terminals and/or fuses)
^ The loss of a good CVRSS system ground
^ The malfunction of the internal CVRSS control module.
The DTC is set when the CVRSS control module is powered and operational, but is unable to communicate with the Instrument Panel Circuit (IPC) because of an open circuit condition, a short circuit to ground condition, or a short circuit to voltage condition on the CLASS 2 circuit. The DTC turns HISTORY when the IPC can communicate with the CVRSS control module.

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.
^ DTC PJ611, U1056 and/or U1255 can be stored.

CONDITIONS FOR CLEARING THE MIL/DTC
1. Use the scan tool.
2. Use the On-Board diagnostic CLEAR RSS CODES feature.

TEST DESCRIPTION
The number(s) below refer to the step number(s) on the diagnostic table.

IMPORTANT: DTCs P1611, U1056, and U1255 can also be a result of:
^ Electrical problems with the wiring harness.
^ Intermittent breaks in Class 2 communication caused by other controllers and/or wiring harness issues.

1. This step checks for a blown ignition fuse.
2. This step checks for blown battery fuse.
3. This step checks for an open circuit condition in the ground circuit.
4. This step checks for an open circuit condition in the battery circuit.
5. This step checks for an open circuit condition in the ignition circuit.
6. This step checks the CLASS 2 bus for a fault condition.
7. This step checks for a short circuit to ground condition in the ignition circuit.
8. This step checks for a short circuit to ground condition in the battery circuit.

IMPORTANT: Do not backprobe the sensors, actuators, or any sealed connectors.