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Home >> Cadillac >> 1995 >> DeVille Concours V8-4.6L VIN 9 >> Repair and Diagnosis >> Steering and Suspension >> Suspension >> Suspension Control ( Automatic - Electronic ) >> Testing and Inspection >> Reading and Clearing Diagnostic Trouble Codes >> Displaying and Reading Trouble Codes >> Without Scan Tool

Without Scan Tool

SELF-DIAGNOSTIC FEATURES












TROUBLE CODES
The RSS control module continually monitors operating conditions for system maiflinctions. By comparing system conditions against standard operating limits, certain circuit and component malfimctions can be detected. A four digit alphanumeric "Trouble Code" is stored in computer memory when a problem is detected by this self-diagnostic system. These "Trouble Codes" can later be displayed by the service technician as an aid in system repair.

HOW TO ENTER DIAGNOSTICS MODE
To enter diagnostic mode, proceed as follows:
1. Turn the ignition switch to the "ON" position.
2. Push the "OFF" and RED (warmer) buttons on the Clirnate Control Center (CCC) simultaneously and hold until the segment check appears on the instrument panel.

NOTICE: Operating the vehicle in diagnostics mode for extended time periods without the engine rnnning or without a battery charger will cause the battery to run down and possibly cause false diagnostic information or a no- start condition. To ensure proper operation, attach a battery charger, if vehicle is to be operated in diagnostic mode without engine running for periods longer than 1/2 hour.

SEGMENT CHECK
The purpose of illuminating the instrument panel is to verify all segments of the LED displays are working. The turn signal indicators do not light during this check. Further diagnosis should not be attempted unless all segments appear, as this could lead to misdiagnosis. If any portions or segments of the instrument panel displays are inoperative, diagnose and repair this problem first.

TROUBLE CODE DISPLAY
After the diagnostic mode is entered, any trouble codes stored in computer memory will be displayed. Codes may be stored for the PCM, IPC, ACP, SIR, TCS, or RSS systems.
Each trouble code consists of the system abbreviation:
(P-PCM, I-IPC, A-ACP, R-SIR, T-TCS, or S-SSS R-RSS) and a three digit code identifier. All codes for each system are displayed together, in the order of their three digit number (lowest first - i.e. S010, SO11, etc.). All codes are designated as cuffent or history. "Current" means the fault was still present the last time the diagnostic test was performed, while "History" means the fault was not present the last time the test was performed.
If no codes are present in the RSS control module a "NO RSS CODES" message will be displayed. If the communication line to the RSS control module is not operating, a "NO RSS DATA" message will be displayed, indicating that the IPC could not communicate with the RSS control module.
At any time during the display of trouble codes, if the. "AUTO" or "DEFOG" button on the IPC is depressed the system will exit "Service Mode" and go back to normal vehicle operation.

HOW TO OPERATE DIAGNOSTICS
After trouble codes have been displayed, diagnostics can be used to perform several tests on different systems one at a time. Upon completion of code display, a specific system may be selected for testing.

SELECTING THE SYSTEM
Following the display of trouble codes, the first available system will be displayed (i.e. PCM?). While selecting a system to test, any of the following actions may be taken to control the display:
1. Depressing the high "^" button on the CCC will select the displayed system for testing.
2. Depressing the low "v" button on the CCC will display the next available system selection. This allows the display to be stepped through all system choices. This list of systems can be repeated following the end of the system list.
3. Depressing the "OFF" button on the CCC will stop the system selection process and return the display to the beginning of the trouble code sequence.

SELECTING THE TEST TYPE
Having selected a system, the first available test type will be displayed (i.e. RSS DATA?). While selecting a specific test type any of the following actions may be taken to control the display:
1. Depressing the high "^" button on the CCC will select the displayed test type. At this point the first ofseveral specific tests will appear.
2. Depressing the low "v" button on the CCC will display the next available test type for the selected system. This allows the display to be stepped through all available test type choices. This list of test types can be repeated following the display of the last test type.
3. Depressing the "OFF" button on the CCC will stop the test type selection process and return the display to the next available system selection.

SELECTING THE TEST
Selection of the "DATA?", "INPUTS?", "OUTPUTS?" or "OVERRIDE?" test types will result in the first available test being displayed. Four characters of the display will contain a test code to identify the selection. The first two characters are letters which identify the system and test type (i.e. SD for RSS DATA) and the last two characters numerically identify the test (i.e. SD11 RF Rotary Sensor Position Signal). While selecting a specific test, any of the following actions may be taken:
1. Depressing the high "^" button on the CCC will display the next larger test number for the selected test type. If this button is pressed with the highest test number displayed, the lowest test number will then appear.
2. Depressing the low "v" button on the CCC will display the next smaller test number for the selected test type. If this button is pressed with the lowest test number displayed, the highest test number will then appear.
3. Depressing the "OFF" button on the CCC will stop the test selection process and return the display to the next available test type for the selected system.

SELECTING "CLEAR CODES"
Selection of the "CLEAR CODES?" test will result in the message "CODES CLEAR" being displayed along with the selected system name. This message will appear for 3 seconds and then return to the next available test type.

HOW TO EXIT DIAGNOSTICS
To exit self-diagnostics, depress the "AUTO" or "DEFOG" button, or turn the ignition switch off. Trouble codes are not erased when this is done.

PARAMETER VALUES DATA
When one of the various data tests is selected, the actual analog value as seen/used by the system is displayed.

INPUTS
Input tests will display the state of the selected device as "HI" or "LO." The display also indicates if the input changed state so that the technician can activate or deactivate any listed device and return to the display to see if it changed state. If a change of state occurred, an "x" will appear next to the "HI" or "LO" indicator, otherwise a "0" will remain displayed. The "X" will only appear once per selected input although the "HI" or "LO" indication will continue to change as the input changes. Some tests are momentary and the "X" can be used as an indication of a change.

OUTPUTS
Output cycling can be used to determine if the output tests can be actuated regardless of the inputs and normal program instructions. Once a test in outputs has been selected, the test will display "HI" and "LO" for three seconds in each state to indicate the command and output terminal voltage.
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